原文传递
Construction Details and Initial Performance of Two High-Performance Base Sections.
| 题名： | Construction Details and Initial Performance of Two High-Performance Base Sections. |
| 作者： | scullion, t. |
| 关键词： | granular bases, specifications, road materials, design, benefits, performance evaluation, texas |
| 摘要： | Traditional Texas flexible bases specified under Item 247 perform well as long as they are kept dry. However, rapid and sudden failures can occur if water enters these bases. In Project 0-4358 draft specifications (proposed Item 245) were developed for high-performance flexible base materials. These specifications tighten all existing specifications, place an upper limit of 10 percent on the amount of material passing the No. 200 sieve, and introduce new procedures to ensure that the base is not moisture susceptible. In project 5-4358-01 two TxDOT pavements containing bases that met the proposed high-performance base specifications were constructed. No handling or segregation problems were encountered. The main concern found by the contractors was the use of nuclear density gauges for measuring density. Alternative methods were investigated. The initial field moduli were measured to be 60 ksi. The long-term benefits of these low-fines bases could not be demonstrated in this short project, since all the applicable sections are new and performing well. However performance problems were encountered on a third section constructed on SH 43. In that case the design caused a bath-tub effect and water became trapped in the low fines base. Based on this experience a day-lighting requirement was placed in the Item 245 specification. / NOTE: Technical rept. (Sept. 2004 - Aug. 2005). / Supplementary Notes: Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0818；28p |
| 报告类型： | 科技报告 |
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