详情

原文传递 LONG-TERM STRENGTH AND DURABILITY OF HYDRATED FLY-ASH ROAD BASES.

题名：	LONG-TERM STRENGTH AND DURABILITY OF HYDRATED FLY-ASH ROAD BASES.
作者：	White-DJ; Bergeson-KL
关键词：	Atmospheric-fluidized-bed-combustion; Base-course-Pavements; Calcium-activators; Cement-kiln-dust; Compaction-; Cores-Specimens; Demonstration-projects; Fly-ash; Freeze-thaw-durability; Hydrated-fly-ash; Laboratory-tests; Moisture-content; Monitoring-; Performance-; Strength-of-materials
摘要：	Long-term performance monitoring was conducted on a demonstration project in which road base materials were constructed from reclaimed hydrated fly ash (HFA) and atmospheric fluidized-bed combustion (AFBC) and cement-kiln dust (CKD) by-products were used as calcium activators. Reclaimed HFA is a form of artificial aggregate produced from compacted, hydrated Class C fly ash at pulverized-coal combustion facilities. Strength testing and chemical analysis indicate that AFBC and CKD activators increase cementitious and pozzolanic reactions in the HFA material. Laboratory analysis determined the preferable range of activator to HFA artificial aggregate ratios for AFBC- and CKD-activated mixtures based on strength development, freeze-thaw durability analysis, compaction characteristics, and optimum moisture content ranges. Results of long-term strength gain from core samples show significant strength increase in the CKD-stabilized HFA base mixture, while the AFBC-stabilized HFA mixture shows signs of freeze-thaw durability problems compared with satisfactory performance experienced in the laboratory with the standard for fly ash for use with lime (ASTM C593). It appears that the AFBC section is still performing well but is probably functioning as a flexible aggregate base rather than a stabilized and cemented semirigid base. Long-term testing indicates that the high-volume application of these by-products is an economical and suitable alternative when used with an appropriate calcium activator.
总页数：	Transportation Research Record. 2001. (1755) pp151-159 (4 Phot., 6 Fig., 3 Tab., 17 Ref.)
报告类型：	科技报告