超细粉煤灰对水泥水化放热影响的研究  

Study on the Effect of Ultra⁃Fine Fly Ash on the Hydration Heat Release of Cement

作　　者：宋德庆 SONG Deqing(China Railway Urban Construction Group Co.Ltd.,Changsha Hunan 410208,China)

机构地区：[1]中铁城建集团有限公司,湖南长沙410208

出　　处：《铁道建筑技术》2023年第12期33-35,62,共4页Railway Construction Technology

基　　金：中铁城建集团有限公司科技研发计划项目(CJKY⁃00⁃2022⁃001)。

摘　　要：为揭示超细粉煤灰代替粉煤灰原灰对水泥水化放热的影响,基于试验利用水泥净浆对比研究超细粉煤灰对水泥基材料标准稠度用水量、凝结时间、抗压强度、水化放热等性能的影响。研究结果表明,超细粉煤灰掺入硅酸盐水泥中可增加水泥标准稠度用水量、缩短凝结时间、增加水泥水化产物,提高粉煤灰水泥石后期抗压强度;30%原状粉煤灰掺入硅酸盐水泥中,没有改变水化放热曲线的形状,最高放热速率和3 d水化放热量约为纯水泥的70%;超细粉煤灰掺入硅酸盐水泥,使得硅酸盐水泥第二水化放热峰后移,钙矾石转化峰前移且大幅增高;气流粉磨超细粉煤灰水泥水化热比粉煤灰原灰水泥提高26%,接近纯水泥的水化热。To reveal the effect of ultra⁃fine fly ash replacing fly ash on the hydration heat release of cement,a comparative study was conducted using cement paste to investigate the effects of ultra⁃fine fly ash on the standard consistency water consumption,setting time,compressive strength,hydration heat release and other properties of cement⁃based materials.The research results indicate that adding ultra⁃fine fly ash to Portland cement can increase the water consumption for standard consistency of cement,shorten setting time,increase cement hydration products,and improve the compressive strength of fly ash cement paste in the later stage.The addition of 30%undisturbed fly ash into Portland cement does not change the shape of the hydration heat release curve,and the maximum heat release rate and 3⁃dimensional hydration heat release are about 70%of that of pure cement.The addition of ultra⁃fine fly ash into Portland cement causes the second hydration exothermic peak of Portland cement to shift backward,and the conversion peak of ettringite to shift forward and increases significantly;the hydration heat of ultra⁃fine fly ash cement produced by airflow grinding is 26%higher than that of fly ash cement,which is close to the hydration heat of pure cement.

关 键 词：超细粉煤灰 凝结时间 水化热 抗压强度 试验 

分 类 号：TU528.041[建筑科学—建筑技术科学]