QUANTIFYING STRUCTURAL BUILD-UP THROUGH EXPERIMENTAL MEASUREMENTS
In its fresh state, SCC is a thixotropic fluid and by definition a finite amount of time is needed for microstructural recovery after it is exposed to external stresses. The degree of structural breakdown and the amount of time needed for the structural network to recover are important for various processes such as casting, pumping, and formwork pressure decay. An experimental study was carried out to evaluate different methods to monitor structural rebuilding evolution. It was found that the Vicat needle test is not an effective method for monitoring the structural rebuilding evolution during the dormant period. Analysis of the pore solution of cement pastes can provide useful information about chemical effects affecting the rate of rebuilding. The zeta potential test may have the potential to monitor changes that are occurring during the dormant period, but difficulties exist with obtaining a reliable estimate of the zeta potential.
Raissa Ferron Surendra P.Shah
Civil, Architectural, and Environmental Engineering Dept, University of Texas-Austin,USA Center for Advanced-Cement-Based Materials, Northwestern University, USA
国际会议
长沙
英文
776-786
2009-06-05（万方平台首次上网日期，不代表论文的发表时间）