粉煤灰对掺新型镁质类膨胀剂的大体积混凝土力学性能的影响  

Effect of flyash on mechanical properties of mass concrete with MgO based expansive agent

作　　者：高培伟[1] 卢小林[1] 董波[1] 闫亚楠[1] 石南南[1] 

机构地区：[1]南京航空航天大学土木工程系,南京210016

出　　处：《水力发电学报》2007年第3期59-62,共4页Journal of Hydroelectric Engineering

基　　金："973"国家重点基础研究基金(2001CB61070503);国家自然科学基金(60672166)

摘　　要：本文研究粉煤灰对大体积混凝土的抗压强度、收缩变形、应力-应变等力学性能的影响,研究结果表明:使用50%的粉煤灰能够改善大体积混凝土90天抗压强度,抑制其收缩与膨胀变形,150天的收缩应变约降低33%,试件开裂时的应变从0.08%延长为0.15%,是不含粉煤灰混凝土的1.875倍。The effects of flyash on the strength, shrinkage strain, and deformation of mass concrete have been described in this paper. The results show that the compressive strengths of mass concrete with 50 % flyash are better than that of concrete with 30% flyash or without flyash at 90 days after pouring, the shrinkage and expansive deformation of dam concrete may be decreased. The shrinkage strain of mass concrete with 50% flyash is about 33 % less than that of specimens without flyash at 150 days after pouring and the strain at the moment of cracking is about 0.15 % higher than 0.08 % without flyash, increasing by 1. 875.

关 键 词：水工材料 力学性能 试验研究 粉煤灰 变形 

分 类 号：TQ528[化学工程—煤化学工程]