新型复合早强剂对水泥砂浆力学性能的影响  

Effect of New Composite Early Strength Agent on Mechanical Performance of Cement Mortar

作　　者：刘春英 任国盛 高小建[2] LIU Chunying;REN Guosheng;GAO Xiaojian(Central Research Institute of Building and Construction Co.,Ltd.,MCC,Beijing 100088,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《硅酸盐通报》2020年第12期3806-3811,共6页Bulletin of the Chinese Ceramic Society

基　　金：中冶建筑研究总院课题(YBC2019ZX06)。

摘　　要：本文试验研究了两种新型复合早强剂(甲酸钙-晶胚、甲基丙烯酸-晶胚)对水泥砂浆新拌性能和力学性能的影响,并通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)进行了微观分析。结果表明,随着早强剂掺量增加,新拌水泥砂浆的流动度略有降低,凝结时间提前。两种复合早强剂均能够加速水泥早期水化,显著提高水泥砂浆的早期强度。甲酸钙-晶胚、甲基丙烯酸-晶胚两种复合早强剂可使水泥砂浆的12 h抗压强度分别提高96.7%和89.3%,抗折强度分别提高192.2%和211.1%;同时,对水泥砂浆28 d抗压强度的提高幅度仍高达50.0%左右,说明两类早强剂对水泥砂浆后期强度发展无负面影响。XRD和SEM分析均证实,掺两类复合早强剂使水泥水化程度提高,水化产物增多,结构密实度提高。In this paper,the effects of two new composite early strength agents(calcium formate-crystal embryo and methacrylic acid-crystal embryo)on the fresh properties and mechanical performances of cement mortar were studied,and the samples were micro-analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results show that with the increase of the early strength agent content,the fluidity of the fresh cement mortar decreases slightly,and the setting time advances.Both two composite early strength agents accelerate the early hydration of the cement and significantly improve the early strength of the cement mortar.Calcium formate-crystal embryo and methacrylic acid-crystal embryo composite early strength agents increase the 12 h compressive strength of cement mortar by 96.7%and 89.3%,and the flexural strength by 192.2%and 211.1%,respectively.At the same time,the 28 d compressive strength of cement mortar still increases by about 50.0%,indicating that the two types of early strength agents have no negative impact on the later strength development of cement mortar.XRD and SEM analysis both confirm that adding two kinds of composite early strength agents improve the hydration degree of cement,increase the hydration products,and improve the structure compactness.

关 键 词：复合早强剂 水泥砂浆 流动性 力学强度 微观结构 

分 类 号：TU528.0[建筑科学—建筑技术科学]