The NTIS website and supporting ordering systems are undergoing a major upgrade from 8PM on September 25th through approximately October 6. During that time, much of the functionality, including subscription and product ordering, shipping, etc., will not be available. You may call NTIS at 1-800-553-6847 or (703) 605-6000 to place an order but you should expect delayed shipment. Please do NOT include credit card numbers in any email you might send NTIS.
Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website; (3) the federal government Internet portal; or (4) a web search conducted using a commercial search engine such as
Accession Number PB2013-111554
Title Evaluation of Crushed Concrete Base Strength.
Publication Date Dec 2012
Media Count 117p
Personal Author H. Hornsby L. A. Cooley
Abstract This research project was conducted with two primary objectives, which include: 1) determine whether current Mississippi Department of Transportation (MDOT) requirements for recycled concrete aggregates (RCA) provide adequate materials for a roadway granular pavement layer and 2) determine whether RCA materials provide the same structural value comparable to crushed limestone granular layers. In order to accomplish these objectives, seven RCA materials were obtained from Mississippi suppliers for testing and evaluation. For comparison purposes, three limestone samples were also obtained and subjected to the same testing regimen. These ten materials were subjected to typical laboratory characterization tests in order to evaluate each material. In addition, California Bearing Ratio and resilient modulus testing was conducted in order to compare the strength and stiffness of the various materials. Based upon the results of the research, RCA meeting all applicable current MDOT requirements should be allowed for granular pavement layers. Because RCA materials can have excessive absorption, RCA stockpiles should be maintained in the field at a moisture content representative of a saturated surface dry condition. This should improve the construction and testing in-place RCA granular pavement layers. A protocol was developed to improve the reliability and repeatability of Proctor testing and preparation of strength and stiffness test specimens.
Keywords Aggregates
California beaming ratio
Construction materials
Geotechnical engineering
Recycled Concrete Aggregates(RCA)
Recycled materials
Retaining walls
Shear strength
Test and evaluation

Source Agency Federal Highway Administration
NTIS Subject Category 50C - Construction Equipment, Materials, & Supplies
50A - Highway Engineering
89G - Construction Materials, Components, & Equipment
Corporate Author Mississippi Dept. of Transportation, Jackson.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1325
Contract Number SS-238

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader