粉煤灰掺量对卵石混凝土性能影响的试验研究  

Experiment study on the performance of pebble concrete with different fly ash content

作　　者：李红梅[1] 李树山[1] 贾明晓[1] 解伟[1] 陈爱玖[1] 

机构地区：[1]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《混凝土》2016年第7期114-116,共3页Concrete

基　　金：国家自然科学基金(U1404526);郑州科技领军人才计划(112PLJRC354);河南省科技攻关项目(112102210243);河南省教育厅科技攻关项目(13B570121);郑州市科技计划项目(131PPTGG410-3)

摘　　要：开展粉煤灰不同掺量下卵石混凝土材料性能试验,研究粉煤灰掺量对卵石混凝土坍落度、抗压强度、劈拉强度、静力抗压弹模以及混凝土水化热温升的影响规律。试验结果表明,保持新拌混凝土坍落度不变时,掺粉煤灰有效降低混凝土的单位用水量;随着粉煤灰掺量的增加,混凝土早期抗压强度降低较多;当粉煤灰掺量不超过30%时,180 d强度逐渐接近纯水泥混凝土的强度;增加粉煤灰的掺量,可显著降低混凝土水化热温升,掺量为40%时,峰值温度平均降低5～7℃。Through some experiments on performance of the pebble concrete with different fly ash content,effects of fly ash content on the slump,compressive strength,splitting tensile strength,static compressive modulus of elasticity and temperature rise of hydration heat of the pebble concrete were investigated.The results show that the unit water in the concrete is alleviated effectively due to adding volume of fly ash,when the slump of the fresh concrete is kept constant.The early strength of concrete decreases much more with the increasing of fly ash content.When the fly ash content is less than 30%,compressive strength of 180 days is gradually close to pure cement concrete. When the fly ash content is increased,the temperature rise of hydration heat can be significantly reduced,when the fly ash content is 40%, the peak temperature is reduced by 5~7 ℃.

关 键 词：卵石混凝土 粉煤灰掺量 力学性能 水化热温升 

分 类 号：TU528.041[建筑科学—建筑技术科学]