石灰石粉细度和掺量对高温水泥混凝土性能的影响  

Effect of Fineness and Content of Limestone Powder on the Performance of High-temperature Cement Concrete

作　　者：张志强 方志杰 柴雪武 金京佩 

机构地区：[1]浙江花园新型建材有限公司,浙江金华322100

出　　处：《混凝土世界》2023年第8期38-42,共5页China Concrete

摘　　要：高温水泥直接应用会对混凝土性能带来不良影响,通过磨细石灰石粉和改变其掺量降低热水泥的负面作用,对工作性能、绝热温升及抗压强度等混凝土性能指标进行研究。结果表明:相同掺量下,石灰石粉细度降低,外加剂用量减少,降低石灰石粉细度和增加掺量都有利于改善混凝土坍落度损失,但会使其凝结时间延长;通过磨细和提高石灰石粉掺量对混凝土内部温升起到调控作用,混凝土的3d和7d抗压强度受掺量影响较大,但通过磨细能够减小因石灰石粉掺量增加对强度的不良影响。The direct application of high-temperature cement can have adverse effects on the performance of concrete.An attempt was made to reduce the negative effects of high-temperature cement by grinding and changing the amount of limestone powder,and to investigate concrete performance indicators such as workability,adiabatic temperature rise,and compressive strength.The results show that under the same dosage,reducing the fineness of limestone powder reduces the amount of admixture used,and both reducing the fineness and increasing the dosage are beneficial to improving the slump loss,but will prolong the setting time of concrete;by grinding and increasing the amount of limestone powder added,the internal temperature rise of concrete can be regulated.The compressive strength of concrete at 3 and 7 days is greatly affected by the amount of limestone powder added,but grinding can reduce the adverse impact of increased limestone powder content on strength.

关 键 词：高温水泥 混凝土性能 磨细 掺量 抗压强度 

分 类 号：TU528.45[建筑科学—建筑技术科学]