Category:303 Rock Base - Revision history

Smithk: updated links

2016-06-08T20:05:21Z

updated links

← Older revision		Revision as of 15:05, 8 June 2016
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	[[image:303.jpg\|right\|400px]]		[[image:303.jpg\|right\|400px]]
	==303.1 Construction Inspection for [http://modot.~~mo.gov~~/business/standards_and_specs/~~Sec0303~~.pdf Sec 303]==		==303.1 Construction Inspection for [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=6 Sec 303]==
	===303.1.1 Description (Sec 303.1)===		===303.1.1 Description (Sec 303.1)===
	When rock is available on a project, often rock base is specified to take advantage of the		When rock is available on a project, often rock base is specified to take advantage of the
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	'''303.1.2.1.2''' If the contractor believes the rejected material meets specification requirements, proving its acceptability rests with the contractor. Acceptance can be demonstrated using the Corps of Engineers test method of excavating a 15 in. X 15 in. area and separating material into its various sizes and components. Flooding the subgrade to demonstrate its drainability has also been used.		'''303.1.2.1.2''' If the contractor believes the rejected material meets specification requirements, proving its acceptability rests with the contractor. Acceptance can be demonstrated using the Corps of Engineers test method of excavating a 15 in. X 15 in. area and separating material into its various sizes and components. Flooding the subgrade to demonstrate its drainability has also been used.

	'''303.1.2.1.3''' In order to properly seat the various rock sizes into a uniform single layer, rock base is to be bladed or dozed into its final position and compacted in conformance with [http://modot.~~mo.gov~~/business/standards_and_specs/~~Sec0203~~.pdf Sec 203]. The inspector must ensure water pockets are not covered. Class C Excavation in rock cuts shall be performed to allow placement of the specified lift thickness. If the contractor uses an optional 24 in. rock base lift, an 18 in. cut and lift is allowable as long as a maximum rock size of 12 in. is maintained for the 18 in. cut.		'''303.1.2.1.3''' In order to properly seat the various rock sizes into a uniform single layer, rock base is to be bladed or dozed into its final position and compacted in conformance with [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 203]. The inspector must ensure water pockets are not covered. Class C Excavation in rock cuts shall be performed to allow placement of the specified lift thickness. If the contractor uses an optional 24 in. rock base lift, an 18 in. cut and lift is allowable as long as a maximum rock size of 12 in. is maintained for the 18 in. cut.

	===303.1.3 Construction Requirements (Sec 303.3)===		===303.1.3 Construction Requirements (Sec 303.3)===
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	===303.1.5 Basis of Payment (Sec 303.5)===		===303.1.5 Basis of Payment (Sec 303.5)===
	Suitable material is often available for rock base from the project rock cuts. If the contractor’s operations render the available project source unusable, the contractor is responsible for any additional expense to provide the necessary base. If the contract indicates suitable rock is available on the project for the rock base but the project source is inadequate, either in quality or quantity, the contractor will be compensated under the provisions of [http://modot.~~mo.gov~~/business/standards_and_specs/~~Sec0109~~.pdf Sec 109].		Suitable material is often available for rock base from the project rock cuts. If the contractor’s operations render the available project source unusable, the contractor is responsible for any additional expense to provide the necessary base. If the contract indicates suitable rock is available on the project for the rock base but the project source is inadequate, either in quality or quantity, the contractor will be compensated under the provisions of [http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=4 Sec 109].

	==303.2 Materials Inspection for Sec 303==		==303.2 Materials Inspection for Sec 303==

Smithk: /* 303.1 Construction Inspection for Sec 303 */Per CM, 12" rock base option provided to bring guidance into compliance with current practice on particle dimensions, material placement, etc

2013-10-31T12:10:07Z

303.1 Construction Inspection for Sec 303: Per CM, 12" rock base option provided to bring guidance into compliance with current practice on particle dimensions, material placement, etc

← Older revision		Revision as of 07:10, 31 October 2013
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	Select material (rock/broken concrete) from the rock excavation is used to provide structure		Select material (rock/broken concrete) from the rock excavation is used to provide structure
	and drainage. Too many fines or deleterious material in the rock will prevent the base from		and drainage. Too many fines or deleterious material in the rock will prevent the base from
	draining or will future create future problems for the pavement. Additional mechanical processing such as, scalping, screening, washing, etc. may be necessary to make the material acceptable. The depth of the base limits the maximum size of the rock base. With an 18 in. depth, the maximum size is not to be larger than 12 in. A thicker lift of rock base is permitted at no additional cost to the commission. The maximum size of rock base of 18 in. can be made for an increased rock base thickness of 24 in. In order to provide a consistent drainable base, the material is to be uniformly graded from course to fine.		draining or will future create future problems for the pavement. Additional mechanical processing such as, scalping, screening, washing, etc. may be necessary to make the material acceptable. The depth of the base limits the maximum size of the rock base. With an 12 in. depth, the maximum size is not to be larger than 9 inches. With an 18 in. depth, the maximum size is not to be larger than 12 in. A thicker lift of rock base is permitted at no additional cost to the commission. The maximum size of rock base of 18 in. can be made for an increased rock base thickness of 24 in. In order to provide a consistent drainable base, the material is to be uniformly graded from course to fine.

	====303.1.2.1 Visual Acceptance (Sec 303.2.1)====		====303.1.2.1 Visual Acceptance (Sec 303.2.1)====
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	===303.1.4 Method of Measurement (Sec 303.4)===		===303.1.4 Method of Measurement (Sec 303.4)===
	[[Image:Rockbasepaylimit.png\|right\|350px]]		[[Image:Rockbasepaylimit.png\|right\|350px]]
	For purposes of design, the volume of rock base is calculated based upon the entire trapezoidal end area. The pay limit however, extends to the point where the surface area, 18 in. thick, intersects the inslope.		For purposes of design, the volume of rock base is calculated based upon the entire trapezoidal end area. The pay limit however, extends to the point where the surface area, 12 in. or 18 in. thick, intersects the inslope.

	During construction, final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.		During construction, final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.

EPG-Admin: /* 303.1.4 Method of Measurement (Sec 303.4) */

2009-01-08T18:08:57Z

303.1.4 Method of Measurement (Sec 303.4)

← Older revision		Revision as of 13:08, 8 January 2009
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	===303.1.4 Method of Measurement (Sec 303.4)===		===303.1.4 Method of Measurement (Sec 303.4)===
	~~Final~~ measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.		[[Image:Rockbasepaylimit.png\|right\|350px]]
			For purposes of design, the volume of rock base is calculated based upon the entire trapezoidal end area. The pay limit however, extends to the point where the surface area, 18 in. thick, intersects the inslope.

			During construction, final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.

	===303.1.5 Basis of Payment (Sec 303.5)===		===303.1.5 Basis of Payment (Sec 303.5)===

Smithk: article construction

2007-10-17T16:16:49Z

article construction

← Older revision		Revision as of 11:16, 17 October 2007
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	==303.1 Construction Inspection for Sec 303==		[[image:303.jpg\|right\|400px]]
			==303.1 Construction Inspection for [http://modot.mo.gov/business/standards_and_specs/Sec0303.pdf Sec 303]==
	===303.1.1 Description (Sec 303.1)===		===303.1.1 Description (Sec 303.1)===
	When rock is available on a project, often rock base is specified to take advantage of the		When rock is available on a project, often rock base is specified to take advantage of the

EPG-Admin at 17:37, 23 August 2007

2007-08-23T17:37:48Z

← Older revision		Revision as of 12:37, 23 August 2007
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	'''303.2.3.2''' No quantity reports are required, however, a letter from the district geologist to theresident engineer, to the effect that the rock base on the project was observed during placement and meets the standard specifications, is required to be in the project files.		'''303.2.3.2''' No quantity reports are required, however, a letter from the district geologist to theresident engineer, to the effect that the rock base on the project was observed during placement and meets the standard specifications, is required to be in the project files.

			==303.3 Laboratory Testing for Sec 303==
			This guidance establishes procedures for inspection and acceptance of material used in rock base.

			===303.3.1 Apparatus===
			Rule with suitable graduations to accurately measure the material to be inspected.

			===303.3.2 Procedure===
			The stone or broken concrete is to be visually inspected for quality and size. A number of individual pieces should be measured to determine specification size compliance.

			Rock base is intended to provide permanent drainage as well as pavement support, therefore, the quality and gradation requirements are very important. The final product must not pond water. Acceptability should be done by a qualified individual, preferably the district geologist.

			No quantity reports are required, however, a letter from the district geologist to the resident engineer, to the effect that the rock base on the project was observed during placement and meets the standard specifications, is required to be in the project files.

EPG-Admin: /* 303.1.3 Construction Requirements (Sec 303.3) */

2007-08-20T19:33:11Z

303.1.3 Construction Requirements (Sec 303.3)

← Older revision		Revision as of 14:33, 20 August 2007
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	not only create additional expense but delay completion of the paving and project completion.		not only create additional expense but delay completion of the paving and project completion.

	===303.1.4 Method of Measurement (Sec 303.4)===.		===303.1.4 Method of Measurement (Sec 303.4)===
	Final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.		Final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.

EPG-Admin at 19:32, 20 August 2007

2007-08-20T19:32:29Z

← Older revision		Revision as of 14:32, 20 August 2007
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	303.1 Description.		==303.1 Construction Inspection for Sec 303==
			===303.1.1 Description (Sec 303.1)===
	When rock is available on a project, often rock base is specified to take advantage of the		When rock is available on a project, often rock base is specified to take advantage of the
	available material on the project to provide both drainage and structure to the pavement.		available material on the project to provide both drainage and structure to the pavement.
	303.2 Material.
	Select material (rock / broken concrete) from the rock excavation is used to provide structure		===303.1.2 Material (Sec 303.2)===
			Select material (rock/broken concrete) from the rock excavation is used to provide structure
	and drainage. Too many fines or deleterious material in the rock will prevent the base from		and drainage. Too many fines or deleterious material in the rock will prevent the base from
	draining or will future create future problems for the pavement. Additional mechanical processing		draining or will future create future problems for the pavement. Additional mechanical processing such as, scalping, screening, washing, etc. may be necessary to make the material acceptable. The depth of the base limits the maximum size of the rock base. With an 18 in. depth, the maximum size is not to be larger than 12 in. A thicker lift of rock base is permitted at no additional cost to the commission. The maximum size of rock base of 18 in. can be made for an increased rock base thickness of 24 in. In order to provide a consistent drainable base, the material is to be uniformly graded from course to fine.
	such as, scalping, screening, washing, etc. may be necessary to make the material acceptable.
	The depth of the base limits the maximum size of the rock base. With an ~~18”~~ depth, the maximum		====303.1.2.1 Visual Acceptance (Sec 303.2.1)====
	size is not to be larger than ~~12”~~. A thicker lift of rock base is permitted at no additional cost to the		Visual acceptance has not been a problem, except in isolated instances. Our specifications state that the material shall be of durable stone or broken concrete with a 10% limit of earth, sand and non-durable rock material. The maximum size of particle is specified with the base to be uniformly graded from course to fine.
	commission. The maximum size of rock base of ~~18”~~ can be made for an increased rock base
	thickness of ~~24”~~. In order to provide a consistent drainable base, the material is to be uniformly		'''303.1.2.1.1''' Too often the source of material is interlaced with extensive clay seams or other undesirable material, which causes the base to be unacceptable as excavated. In these situations, it may be necessary to screen the excessive undesirable material to provide a suitable base.
	graded from course to fine.
	303.2.1 Visual Acceptance.		'''303.1.2.1.2''' If the contractor believes the rejected material meets specification requirements, proving its acceptability rests with the contractor. Acceptance can be demonstrated using the Corps of Engineers test method of excavating a 15 in. X 15 in. area and separating material into its various sizes and components. Flooding the subgrade to demonstrate its drainability has also been used.
	Visual acceptance has not been a problem, except in isolated instances. Our specifications
	state that the material shall be of durable stone or broken concrete with a 10% limit of earth, sand		'''303.1.2.1.3''' In order to properly seat the various rock sizes into a uniform single layer, rock base is to be bladed or dozed into its final position and compacted in conformance with [http://modot.mo.gov/business/standards_and_specs/Sec0203.pdf Sec 203]. The inspector must ensure water pockets are not covered. Class C Excavation in rock cuts shall be performed to allow placement of the specified lift thickness. If the contractor uses an optional 24 in. rock base lift, an 18 in. cut and lift is allowable as long as a maximum rock size of 12 in. is maintained for the 18 in. cut.
	and non-durable rock material. The maximum size of particle is specified with the base to be uniformly
	graded from course to fine.		===303.1.3 Construction Requirements (Sec 303.3)===
	303.2.1.1 Too often the source of material is interlaced with extensive clay seams or other		The top 2 in. of the rock base is to constructed with a 2 in. finer rock cap to allow autograding operations. The contractor is allowed a tolerance of 1/2 in. for the finished rock base. The final approved surface of the rock base shall be roughly compensating, i.e. there should be as many cuts in the base to fill in the low areas. The paving contractor may need to provide additional fill aggregate to provide a suitable paving subgrade.
	undesirable material, which causes the base to be unacceptable as excavated. In these situations,
	it may be necessary to screen the excessive undesirable material to provide a suitable base.
	303.2.1.2 If the contractor believes the rejected material meets specification requirements,
	proving its acceptability rests with the contractor. Acceptance can be demonstrated using
	the Corps of Engineers test method of excavating a ~~15”~~ X ~~15”~~ area and separating material into its
	various sizes and components. Flooding the subgrade to demonstrate its drainability has also been
	used.
	303.2.1.3 In order to properly seat the various rock sizes into a uniform single layer, rock
	base is to be bladed or dozed into its final position and compacted in conformance with Sec 203.
	The inspector must ensure water pockets are not covered. Class C Excavation in rock cuts shall
	be performed to allow placement of the specified lift thickness. If the contractor uses an optional
	~~24”~~ rock base lift, an ~~18”~~ cut and lift is allowable as long as a maximum rock size of ~~12”~~ is maintained
	for the ~~18”~~ cut.
	~~General Construction Manual~~
	~~© Missouri Department of Transportation 2006 300-5~~
	303.3 Construction Requirements.
	The top 2” of the rock base is to constructed with a 2” finer rock cap to allow autograding
	operations. The contractor is allowed a tolerance of ½” for the finished rock base. The final
	approved surface of the rock base shall be roughly compensating, i.e. there should be as many
	cuts in the base to fill in the low areas. The paving contractor may need to provide additional fill
	aggregate to provide a suitable paving subgrade.
	Monitoring is especially crucial if the project is not a turn-key contract, i.e. both base and		Monitoring is especially crucial if the project is not a turn-key contract, i.e. both base and
	paving operation are included into a single contract. Large rock in the top layer of the base prevents		paving operation are included into a single contract. Large rock in the top layer of the base prevents the paving contractor from autograding the base to obtain a suitable pavement subgrade.
	the paving contractor from autograding the base to obtain a suitable pavement subgrade.
	Additional operations to remove the larger rock from the subgrade and to reprocess the subgrade		Additional operations to remove the larger rock from the subgrade and to reprocess the subgrade
	not only create additional expense but delay completion of the paving and project completion.		not only create additional expense but delay completion of the paving and project completion.
	~~303.4 Method of Measurement.~~
	~~Final measurement of the completed rock base will not be made except for authorized~~
	~~changes during construction, or where appreciable errors are found in the contract quantity.~~
	~~303.5 Basis of Payment.~~
	~~Suitable material is often available for rock base from the project rock cuts. If the contractor’s~~
	~~operations render the available project source unusable, the contractor is responsible for any~~
	~~additional expense to provide the necessary base. If the contract indicates suitable rock is available~~
	~~on the project for the rock base but the project source is inadequate, either in quality or quantity,~~
	~~the contractor will be compensated under the provisions of Section 109.~~

	303.1 ~~SCOPE~~. To establish procedures for inspection and acceptance of material used in		===303.1.4 Method of Measurement (Sec 303.4)===.
	rock base.		Final measurement of the completed rock base will not be made except for authorized changes during construction, or where appreciable errors are found in the contract quantity.
	303.2 ~~APPARATUS~~.
	a. Rule with suitable graduations to accurately measure the material to be inspected.		===303.1.5 Basis of Payment (Sec 303.5)===
	303.3 ~~PROCEDURE.~~ The stone or broken concrete is to be visually inspected for quality and		Suitable material is often available for rock base from the project rock cuts. If the contractor’s operations render the available project source unusable, the contractor is responsible for any additional expense to provide the necessary base. If the contract indicates suitable rock is available on the project for the rock base but the project source is inadequate, either in quality or quantity, the contractor will be compensated under the provisions of [http://modot.mo.gov/business/standards_and_specs/Sec0109.pdf Sec 109].
	size. A number of individual pieces should be measured to determine specification size
	compliance.		==303.2 Materials Inspection for Sec 303==
	303.3.1 Rock base is intended to provide permanent drainage as well as pavement support,		===303.2.1 Scope===
			To establish procedures for inspection and acceptance of material used in rock base.

			===303.2.2 Apparatus===
			Rule with suitable graduations to accurately measure the material to be inspected.

			===303.2.3 Procedure===
			The stone or broken concrete is to be visually inspected for quality and size. A number of individual pieces should be measured to determine specification size compliance.

			'''303.2.3.1''' Rock base is intended to provide permanent drainage as well as pavement support,
	therefore, the quality and gradation requirements are very important. The final product must not		therefore, the quality and gradation requirements are very important. The final product must not
	pond water. Acceptability should be done by a qualified individual, preferably the district		pond water. Acceptability should be done by a qualified individual, preferably the district
	geologist.		geologist.
	303.3.2 No quantity reports are required, however, a letter from the district geologist to ~~the~~
	~~resident~~ engineer, to the effect that the rock base on the project was observed during placement		'''303.2.3.2''' No quantity reports are required, however, a letter from the district geologist to theresident engineer, to the effect that the rock base on the project was observed during placement and meets the standard specifications, is required to be in the project files.
	and meets the standard specifications, is required to be in the project files.

EPG-Admin at 18:34, 20 August 2007

2007-08-20T18:34:36Z

New page

303.1 Description.
When rock is available on a project, often rock base is specified to take advantage of the
available material on the project to provide both drainage and structure to the pavement.
303.2 Material.
Select material (rock / broken concrete) from the rock excavation is used to provide structure
and drainage. Too many fines or deleterious material in the rock will prevent the base from
draining or will future create future problems for the pavement. Additional mechanical processing
such as, scalping, screening, washing, etc. may be necessary to make the material acceptable.
The depth of the base limits the maximum size of the rock base. With an 18” depth, the maximum
size is not to be larger than 12”. A thicker lift of rock base is permitted at no additional cost to the
commission. The maximum size of rock base of 18” can be made for an increased rock base
thickness of 24”. In order to provide a consistent drainable base, the material is to be uniformly
graded from course to fine.
303.2.1 Visual Acceptance.
Visual acceptance has not been a problem, except in isolated instances. Our specifications
state that the material shall be of durable stone or broken concrete with a 10% limit of earth, sand
and non-durable rock material. The maximum size of particle is specified with the base to be uniformly
graded from course to fine.
303.2.1.1 Too often the source of material is interlaced with extensive clay seams or other
undesirable material, which causes the base to be unacceptable as excavated. In these situations,
it may be necessary to screen the excessive undesirable material to provide a suitable base.
303.2.1.2 If the contractor believes the rejected material meets specification requirements,
proving its acceptability rests with the contractor. Acceptance can be demonstrated using
the Corps of Engineers test method of excavating a 15” X 15” area and separating material into its
various sizes and components. Flooding the subgrade to demonstrate its drainability has also been
used.
303.2.1.3 In order to properly seat the various rock sizes into a uniform single layer, rock
base is to be bladed or dozed into its final position and compacted in conformance with Sec 203.
The inspector must ensure water pockets are not covered. Class C Excavation in rock cuts shall
be performed to allow placement of the specified lift thickness. If the contractor uses an optional
24” rock base lift, an 18” cut and lift is allowable as long as a maximum rock size of 12” is maintained
for the 18” cut.
General Construction Manual
© Missouri Department of Transportation 2006 300-5
303.3 Construction Requirements.
The top 2” of the rock base is to constructed with a 2” finer rock cap to allow autograding
operations. The contractor is allowed a tolerance of ½” for the finished rock base. The final
approved surface of the rock base shall be roughly compensating, i.e. there should be as many
cuts in the base to fill in the low areas. The paving contractor may need to provide additional fill
aggregate to provide a suitable paving subgrade.
Monitoring is especially crucial if the project is not a turn-key contract, i.e. both base and
paving operation are included into a single contract. Large rock in the top layer of the base prevents
the paving contractor from autograding the base to obtain a suitable pavement subgrade.
Additional operations to remove the larger rock from the subgrade and to reprocess the subgrade
not only create additional expense but delay completion of the paving and project completion.
303.4 Method of Measurement.
Final measurement of the completed rock base will not be made except for authorized
changes during construction, or where appreciable errors are found in the contract quantity.
303.5 Basis of Payment.
Suitable material is often available for rock base from the project rock cuts. If the contractor’s
operations render the available project source unusable, the contractor is responsible for any
additional expense to provide the necessary base. If the contract indicates suitable rock is available
on the project for the rock base but the project source is inadequate, either in quality or quantity,
the contractor will be compensated under the provisions of Section 109.

303.1 SCOPE. To establish procedures for inspection and acceptance of material used in
rock base.
303.2 APPARATUS.
a. Rule with suitable graduations to accurately measure the material to be inspected.
303.3 PROCEDURE. The stone or broken concrete is to be visually inspected for quality and
size. A number of individual pieces should be measured to determine specification size
compliance.
303.3.1 Rock base is intended to provide permanent drainage as well as pavement support,
therefore, the quality and gradation requirements are very important. The final product must not
pond water. Acceptability should be done by a qualified individual, preferably the district
geologist.
303.3.2 No quantity reports are required, however, a letter from the district geologist to the
resident engineer, to the effect that the rock base on the project was observed during placement
and meets the standard specifications, is required to be in the project files.