详情

原文传递 Characterization of Low Temperature Mechanical Properties of Crack Sealants Utilizing Direct Tension Test.

题名：	Characterization of Low Temperature Mechanical Properties of Crack Sealants Utilizing Direct Tension Test.
作者：	I. L. Al-Qadi; S. Yang; J. Masson; K. K. McGhee;
关键词：	hot-poured crack sealants,low temperature,pavement maintenance,hot mix paving mixtures,mechanical properties,direct tension test(dtt),crack sealant direct tension test(csdtt);testing, preventative maintenance, specifications, dog-bone specimen, performanc
摘要：	Crack sealing has been widely used as a routine preventative maintenance practice. Given its proper installation, crack sealants can extend pavement service life by three to five years. However, current specifications for the selection of crack sealants correlate poorly with field performance. The purpose of this research was to develop performance guidelines for the selection of hot-poured bituminous crack sealants at low temperature. This was accomplished by measuring the mechanical properties of crack sealant at low temperature and then developing performance criteria for material selection. The modified direct tension test (DTT), crack sealant direct tension test (CSDTT), simulates the in-situ loading behavior of crack sealants in the laboratory. A modified dog-bone specimen geometry, which allows specimens to be stretched up to 95%, is recommended. This new specimen geometry also facilitates sample preparation. Tensile force is applied to the dog-bone specimen, with its effective gauge length of 20.3mm, and is pulled at a deformation rate of 1.2mm/min. Fifteen sealants were tested at various temperatures, and three performance parameters are suggested as indicators of sealant performance: extendibility, percent modulus reduction, and strain energy density. Extendibility, which is used to assess the degree of deformation undergone by a sealant at low temperature before it ruptures or internal damage is observed, is recommended as a measured parameter to be included in the performance-based guidelines for the selection of hot-poured crack sealants. Extendibility thresholds were defined as function of low service temperatures. The CSDT is conducted at +6 degrees C above the lowest in service temperature because of the relatively high test loading rate compared to in-situ crack sealant movement rate. / Title Note: Technical rept. / Supplementary Notes: See also PB2001-105949, PB2010-108971 and PB2010-108972. Sponsored by Virginia Transportation Research Council, Charlottesville. and Federal Highway Administration, Richmond, VA. Virginia 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 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A05 / NTIS In-house Control Codes: dotfha/iuu;12091,1101 &C / Project Number: VTRC-67775 / Monitor Agency Acronym: ICT / Monitor Agency Number: 08-028 / Corporate Author Code: 034597013 / Classifivation: Unclassified report
报告类型：	科技报告