A. Aggregate base course shall consist of crushed gravel or crushed stone, conforming to the quality requirements of AASHTO M 147. The aggregate shall be free from lumps, balls of clay, or other objectionable matter, and shall be durable and sound. B. Base course material shall conform to one of the following gradations as specified:
3.1.4 Crushed aggregate base course materials shall be produced and placed in their final location with as little segregation as possible. 3.1.5 Excess reclaimed stabilized base material substantially meeting the requirements of 2.7 may be substituted for the crushed aggregate for shoulders in 2.6.
When gravel base is specified in the contract, the Contractor may request, in writing, that gravel borrow be used in lieu of gravel base. When gravel borrow is substituted for gravel base, the top 0.10 ft of gravel borrow shall be replaced with 0.10 ft of crushed surfacing top course (CSTC).
The California Department of Transportation (Caltrans) provides specifications for the use of recycled aggregate, sometimes referred to as crushed miscellaneous base (CMB), as base (section 26) or subbase (section 25) on road projects.This Department of Resources Recycling and Recovery (CalRecycle) webpage is a selective list of Caltrans specifications for the use of recycled aggregate …
Provides individual specifications from AC 150/5370-10, Standards for Specifying Construction of Airports, including construction standards for general provisions, earthwork, flexible base courses, rigid base courses, flexible surface courses, rigid pavement, fencing, drainage, turfing, lighting installation, pavement rejuvenation
The base course or basecourse in pavements is a layer of material in an asphalt roadway, race track, riding arena, or sporting field.It is located under the surface layer consisting of the wearing course and sometimes an extra binder course.. If there is a sub-base course, the base course is constructed directly above this layer.
Aug 14, 2009· An aggregate base course is the layer of soil installed between the surface pavement layer and subgrade (foundation soils) of either flexible or rigid pavement.Their purpose is to help transition surface loads from the pavement to the subgrade, evenly support the pavement surface profile, and protect the overall pavement system from water intrusion and deformation.
Crushed Aggregate Base Coarse (Compaction Gravel) shall consist of one or more courses or layers of coarse aggregate, either crushed gravel or crushed stone, fine aggregate and binder or filler blended as necessary to produce an intimate mixture of the required gradation and stability.
A. Aggregates: Aggregates for bases shall be crushed stone, crushed slag, crushed gravel or natural gravel that conforms to the quality requirements of AASHTO M147, except that the requirements for the ratio for the minus No. 200 sieve fraction to the ... 32 11 23 Aggregate Base Course ...
Use graded aggregate base, subbase, or shoulder course material of uniform quality. a. Obtain the graded aggregate from an approved source or deposit that will yield a satisfactory mixture meeting all requirements of this Specification. b. Use material that is crushed or processed as a part of the mining operations, or, mix two grades of ...
SECTION 02621 AGGREGATE BASE AND SUBBASE COURSES 02621.01 GENERAL A. Description Aggregate base and subbase courses shall include, but not necessarily be limited to, furnishing and placing one or more courses of aggregate, including additives when required, on a surface prepared in accordance with the Contract Documents. B. Related Work ...
P-209, Crushed Aggregate Base Course Page 3 of 5 the materials to meet the specifications and to secure the proper moisture content for compaction. 3.3 Placing. The crushed aggregate base material shall be placed on the moistened subgrade in layers of uniform thickness with a mechanical spreader. The maximum depth of a compacted layer shall
The aggregate shall be free from lumps of clay, organic matter, and other objectionable materials or coatings. And for P-209. This item consists of a base course composed of crushed aggregate base constructed on a prepared course in accordance with these specifications and in conformity to the dimensions and typical cross-sections shown on the ...
Our Products. Cornerstone produces a wide range of aggregate products – ranging from decorative stone to fill material. Some examples of our product range include: Backfill materials Boulders Crusher Feed Banday banda Base Course / Sub Base Course S-1 (Fine Sand)...
Aggregate Baserock Primer. Aggregate Baserock is a dense graded blend of coarse and fine aggregate which when properly placed and compacted provide a stable and durable base allowing further construction. Aggregate Baserock Should Demonstrate: Stability: Resist deformation when under load (after proper placement and compaction).
Jun 09, 2005· I am converting (CY) of aggregate (for a road construction project) to (TONS). Does any one have scientific data to use for the density of aggregate base rock? Several sources state that "most natural" aggregates have particle densities between 150 and 181 (lb/ft^3).
301.03.4 Crushed Aggregate Course . When crushed aggregate course is a bid item, construct the aggregate surfacing section to the specified typical cross section and profile grade. Select one of the following two options to construct the aggregate section: 1. Full depth crushed base course. 2.
There are two categories of based course. Dense graded Bases, referred to locally as traffic bond, are well graded and include fines that firm up and become a hard, solid base for a variety of uses in construction. In general, the heavier the load, the larger the stone you will select in your base course.
Asphalt concrete base (ACB), also called asphalt treated base (ATB), is a dense-graded HMA with a larger nominal maximum aggregate size (1 inch) intended for use as a base course or binder course (see Figure 1). In addition to site paving benefits, ACB can be advantageous because it can provide: A waterproof barrier to prevent fines infiltration into the subgrade and pavement structure.
Aug 08, 2018· The sub-base if formed by dust and small chipped aggregate layers, typically Crushed Fines. The crushed aggregate base lays on heavy traffic or driveways areas. Dense Aggregate Base. Dense-graded base course are aggregates having different particular size. Recycled aggregates in concrete can also be of use. They form a dense layer having stones ...
Construction Aggregate Calculator Enter the width, length, thickness, and product density and hit the "Calculate" button to calculate your estimate. If you do not know the product density, use the optional density estimator* or contact a local sales representative.
P-208 SPECIFICATION P–208. AGGREGATE BASE COURSE DESCRIPTION 208–1.1 This Work consists of a base course composed of hard, durable particles or fragments of crushed coarse aggregate blended with either binder and fine aggregate or filler. Construct it on a prepared underlying course in accordance with these Specifications and in conformance
Aggregate Base Course DESCRIPTION 1.1 This item shall consist of a base course composed of a partially crushed and uncrushed coarse aggregate combined with natural fine aggregates (sand) and soil. It shall be constructed on a prepared underlying course in …
Aggregate base is a construction aggregate typically composed of crushed rock capable of passing through a 20 millimetres (3 ⁄ 4 in) rock screen.The component particles will vary in size from 20 mm down to dust. The material can be made of (newly mined) rock, or of recycled asphalt and concrete.
(1) Composition. Provide coarse aggregate that is crushed or uncrushed gravel, chat, or crushed stone. (Consider limestone, calcite cemented sandstone, rhyolite, quartzite, basalt and granite as crushed stone). When using quartzite, include supplementary cementitious materials to prevent ASR. Mixtures utilizing quartzite must
Crushed Fines and also known as Quarry Dust, is a form of fractured gravel chips and fine dust used to solidify the base under patios and walkways. The Sub-Base is laid above the ABC or Sub-Grade at 1″ to 2″ inches on light weight traffic areas like pathways and paver patios. Cross-Section layers that make up a mortar-less or "dry-laid" pavement.
Crushed stone (aggregate) – North Carolina Geological Survey. One mile of typical 2-lane asphalt road with aggregate base requires about 25,000 tons … Because aggregate is a heavy, low cost per ton product, haul distance … »More detailed
Tenders are invited for estimated amounts of construction items are as follows: 1,586 cy of common excavation; 1,551 cy of backfill granular 2,650 t crushed aggregate base course 1,910 lf of 30" concrete curb and gutter 6,250 sf of 4" & 6" sidewalk 550 t hma pavement 425 lf of 8" watermain 850 lf of 18: & 15" sanitary sewer 750 lf of r.
Do not use crushed concrete coarse aggregate in the following: mainline pavements or ramps with a commercial ADT greater than or equal to 250, concrete base course, bridges, box or slab culverts, headwalls, retaining walls, pre-stressed concrete, or other heavily reinforced concrete. Avoid contamination with non-concrete materials, including ...
As illustrated at the right it's simply a matter of taking the height at the tallest point and the width at the base of the triangle and then multiplying those by half. So in this case the formula you need is: Area = 0.5 x Width x Height. Height In Feet Width In Feet Total Square Feet.