placing subsequent material. 2. Base Course of Rigid Pavement This is the layer directly below the PCC layer and generally consists of aggregate or stabilized sub-grade. No. The base course beneath rigid pavements. Base course materials and installation are not included in this specification. 1.2.2 Sub-base layer – the layer of material between the sub-grade and the base course. b. 3.16 The finished surface of the base course shall be true to grade and cross section and free of any surface defects. 40 sieve Liquid limit & Plasticity index One per source LL ≤ 25 PI ≤ 4 ASTM 4318 Contractor 209-2.1 Fine Aggregate Base material fine aggregate Source One per source Minimum Sand Equivalent value of 35 ASTM 2419 QA 209-3.4 and 209-3.5 Aggregate Moisture/ Density The base course material, according to ACI 302, "Concrete Floor and Slab Construction," should be "compactible, easy to trim, granular fill that will remain stable and support construction traffic." “ Base Course” means the material which is placed on the compacted sub-grade to form the lower part of the pavement. “Surface Course” means the material placed over the base course to form the wearing surface. ASTM D2419 Test Method for Sand Equivalent Value of Soils and Fine Aggregate 6. STANDARD SPECIFICATION - Aggregate Sub-base Course - Aggregate Base Course DPWH Item 200 Item 201 DEFINITION OF SOIL AND ITS COMPONENTS Soil Aggregate ( Dense Graded Aggregate ) - natural or prepared mixtures consisting predominantly of stone, gravel or sand and containing silt-clay minus 0.075 mm material. Flexible Base 1. Such base course materials will be called graded aggregate base course materials in this paper. Sand: Granular material passing the 3/8 in. AGGREGATE BASE COURSE MATERIAL TESTING AND RUTTING MODEL DEVELOPMENT NCDOT Project 2013‐18 FHWA/NC/2013‐18 December 2014 Liang Chern Chow Debakanta Mishra, Ph.D. Erol Tutumluer, Ph.D. Department of Civil and Environmental Engineering University of Illinois at Urbana‐Champaign
Notice the major differences in the above specification in the top-sized material and the smallest sized material. File No. conforming to Specification Section 901 in lieu of the Class II Base Course type selected for the project. If additional aggregate is required, the course shall be remixed and re-compacted. Not intended for use in locations where surfacing will not be placed over the base. GRADED AGGREGATE BASE. 247.2. Materials. The base course beneath rigid pavements. standard specification has been developed, sites for long-term field studies will be identified to implement further the recommendations stemming from this study.
New Features. 2. When the subgrade strength is higher, a thinner base course wil… 4. No direct payment will be made for providing water for compaction. DESCRIPTION Construct a foundation course composed of flexible base. Use graded aggregate material, produced from Department approved sources, which yields a satisfactory mixture meeting all the requirements of these Specifications after it has been crushed and processed as a part of the mining operations. Unpaved Road Material Specifications There are a range of recommendations, guidelines, and specifications available for unpaved road base and wearing course materials. "Aggregate Base Course" should be retained in the title and the rest of the specification should be
Specifications of granular sub-base (GSB) materials conforming to MORTH: Specifications for Road and Bridge Works are recommended for use. Masterworks Navigation (pdf) Aggregate Supplier Target Letter Form (pdf) Embankment Borrow and Backfill Form (pdf) It is usually not provided on subgrade of good quality. Crushed … 2042 Materials. placing subsequent material. Notification Email Recipients Override Process (Updated on 10/6/2020) Contacts. When the subgrade strength is low, the stress must be reduced to a low value and a thick base is needed. Lay one course to a maximum thickness of 8 in (200 mm) compacted. The aggregates shall meet the requirements of subsection 703.03. RAW BASE COURSE When raw base course is placed, the QC requirements will be the same as for stabilized base course, with the exception of the stabilization process. designate and associate the appropriate type and grade of flexible base . 209-2.1 AGGREGATE. SPECIFICATION P–208.
1010.01.01 Specification Significance and Use . The base course requires 100% of the material to pass a 1 inch sieve, but allows up to 20% of the stone to be Status of AASHTO Materials Standards and Test Methods—2015 This document shows all materials specifications, practices, and test methods that have been published as part of the AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing from its first publication in 1931 through the most recent edition. ACI 302 recommends material with 10 to 30% fines (passing the No. Should the subbase course become unstable at any time prior to the placement of the overlying course due to the gradation of the BASES . When this guide specification is used in combination for a subbase D.Scott Potter: 801-647-3459; dspotter@utah.gov. Use graded aggregate material, produced from Department approved sources, which yields a satisfactory mixture meeting all the requirements of these Specifications after it has been crushed and processed as a part of the mining operations. The sub-base layer is often the main load-bearing layer of a pavement. Tim Wozab: 801-633-7619; twozab@utah.gov. BASE COURSE-A layer or layers of specified material of designated thickness placed on a subbase or a subgrade to support a surface course or courses. (a) Type A aggregate for … ... Base course material, consisting of a specific type of aggregate, is placed on top of the subbase. 303.07 Checking and Correcting Base and Surface The top of each aggregate course shall be checked transversely and all 50 deviations in excess of 1/2 in. Contractor shall proceed with delivery of crushed aggregate base coarse (Compaction Gravel) upon 12 hour notice. (Supplemental Specification) 1-17 Workbook Redline Section, including Mandatory Revisions; AGGREGATES: 901: COARSE AGGREGATE : 902: FINE AGGREGATE : FLEXIBLE-PAVEMENT MATERIALS (INCLUDING MATERIALS FOR STABILIZING) 911: BASE AND STABILIZED BASE MATERIALS : 914: STABILIZATION MATERIALS : 916: BITUMINOUS MATERIALS : 917: … Master Tol. U.S. Standard Base S/B Master Tol. The Contractor shall perform all work required by the plans and specifications for construction of a subbase material, herein termed econocrete, that is composed of aggregate and cement uniformly blended together and mixed with water. In localities where soil type base course materials are not available, base course materials are produced from crushed stone, crushed slag', or gravel with or without soil admixture. Where not indicated, compacted thickness shall be 6 inches.
The compacted surface of the stone base shall not vary more than 1/2" from the required elevations. DURABILITY The material shall comply with the requirements in columns 3,4 and 5 of table 3602/2. The material shall be delivered in approved vehicles of a uniform capacity and it shall be the charge of the Contractor that the required amount of specified material shall be delivered in each 100-foot station. 1.2 This work shall also include raising the grade of the edge of the roadway shoulders with crushed aggregate as shown Subbase-and base-course materials are tested for compliance with specification requirements for gradation, liquid limit (LL), plasticity index (PI). and CBR values. When tests are completed, limiting conditions in the subgrade and subsoil must be determined. On public highways and other heavier-use projects, the binder course may be underlain by a … SECTION 304 AGGREGATE BASE COURSE DESCRIPTION . a. Deviations in aggregate base course under pavements of more than one-quarter (1/4) inch in ten (10) feet, The surface shall be prepared at least one but not more than three kilometres in advance of placing granular base course. The material should be tested for CBR at the dry density and Construct it on a prepared underlying course in accordance with these Specifications and in conformance [2]Ensure that material is substantially free of reclaimed asphalt. Anticipated revisions to specifications. 195mm then regulating will be carried out with binder course material. Aggregate base course shall have minimum uniform thickness after compaction of dimensions indicated.
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