CONTENTS Use of materials for highways.. Authority for research and development cooperation_ Bureau's activities in the materials field.. New methods in exploration for materials. New methods in highway design.. Application of electronic computers_ New test methods for quality control. Simplified bridge designs with standardized components_ Standard plans by Bureau of Public Roads_- Standard bridge components___. Steel in precast, prestressed bridges..- Page IX Aggregates and mineral fillers. Aggregate gradation chart by Bureau. Bituminous stabilization and protection.. New equipment and procedures for bituminous paving Reduction in mixing time for bituminous concrete. 1. Using a nuclear moisture-density gage to determine subgrade moisture_ 2. A new hauling scraper model with self-loading device___ 7 11 3. Ripping tight materials with a crawler tractor with rear-mounted ripper 4. Side dozing with a wheel-type tractor 5. A self-propelled tamping roller provides high speed compaction in many types of soil. 6. Producing six sizes of crushed stone with a modern portable crushing plant of 400-ton per hour capacity. 7. The modern front-end loader is one of the principal machines used in 8. Slope control panel for an electronically controller motor grader blade.. 11. Placing an aluminum V-beam of semimonocoque construction. Top 13. The triple compartment (or drum) paver has made it possible to increase production of quality concrete at the worksite___ 14. A modern portable central mix plant and nonagitator truck for pro- ducing and hauling portland cement concrete... 15. Extruding a nonreinforced concrete slab with a slip-form paver which is fed by two dual compartment paver mixers.. 16. A modern batch type plant discharging bituminous concrete into the 19. Applying liquid asphalt in resealing operation with one of the new bituminous distributor models... 20. Specialized equipment for hauling and spreading chlorides reduces Exhibit A.-Estimate of receipts and disbursements for highways, 1959–62. BPR 62-1. Release dated January 7, 1962. Exhibit B. Mixing time on multicomponent pavers-Summary and analy- Exhibit F. "Availability of Aggregates for Construction." Circular memorandum to regional and division engineers, June 23, 1958. Exhibit I.-Highway usage factors for concrete pipe and clay pipe---- Exhibit J.-Highway usage factors for lumber, timber piling, petroleum THE USE OF MATERIALS FOR THE NATION'S HIGHWAYS A REPORT TO THE U.S. SENATE COMMITTEE ON PUBLIC WORKS BY THE U.S. BUREAU OF PUBLIC ROADS, MAY 17, 1962 INTRODUCTION Request for report on materials On January 16, 1962, the U.S. Senate Committee on Public Works approved a committee resolution, authorizing hearings, study, and a report on the use of materials in the construction of roads and other public works. Subsequently, by letter dated January 30, 1962, the chairman of the committee, the Honorable Dennis Chavez, requested the Federal Highway Administrator to appear before the Committee on Public Works and make a formal presentation on the use of materials for highways. The presentation is to cover new materials, new uses of conventional materials, new designs, and new methods of processing or placing in the construction, preservation, and operation of highways. It is to include a description of physical and chemical characteristics, laboratory and field tests, limitations, cost and availability of highway materials. The presentation is to be a constructive contribution to the various producers, fabricators, and users of materials. Scope of highway use of materials The highway construction volume to be placed in 1962, exclusive of outlays for right-of-way and engineering, by all levels of government, including Federal-aid, is estimated at $5.6 billion. In addition, $2.8 billion will be spent for highway maintenance. Fifty-two percent of the construction dollar will go for materials and supplies and 23 percent for equipment, repair parts, and operating costs to process the materials. Thirteen percent of the maintenance dollar will go for materials and 26 percent for equipment to process the materials and to preserve and operate the completed highways. According to these percentages, approximately $3.3 billion of materials and about $2 billion for equipment, repair parts, and operating costs will be used in both the construction and maintenance programs in 1962. Table No. 1, Exhibit K, lists the quantity of materials to be used in the construction and maintenance road programs for 1962 and for the period from 1962 to 1972. Table No. 2, Exhibit L, lists the number of equipment units required for replacement and expansion in the 1962 road program. The following table A gives a percentage of material used based on highway construction contract costs: 2.0 .5 8.0 1.0 9. 0 10. 0 Petroleum products. 4. 0 Others 5 |