铝溶胶对水泥基材料性能的影响及机理  

Effect and Mechanism of Alumina Sol on Properties of Cement-based Materials

作　　者：陈科[1] 邓安仲[2] 戎翔[1] 陈静波[1] 

机构地区：[1]后勤工程学院化学与材料工程系,重庆401331 [2]后勤工程学院军事工程管理系,重庆401331

出　　处：《后勤工程学院学报》2017年第1期62-67,共6页Journal of Logistical Engineering University

摘　　要：以铝溶胶为掺合料,研究了其质量分数对水泥基材料力学性能的影响,并通过水化热测试、XRD和SEM观测等手段对其机理进行了分析。结果表明:随着铝溶胶质量分数的增加,水泥砂浆试样流动度不断降低,各龄期抗折与抗压强度呈现出先增大后减小的趋势,铝溶胶质量分数为2%时,强度均达到峰值;向水泥浆体中掺入铝溶胶,其水化放热速率增大,水化诱导期缩短,从而加快了水泥水化进程;另外,随着铝溶胶的掺入,消耗了水泥水化生成的Ca(OH)_2,生成了更多对强度有利的C-S-H、C-A-H等凝胶,使得水泥砂浆试样微观结构更加均匀、密实,从而提高了其密实度和强度。With alumina sol as additive, the effect of the mass fraction of alumina sol on mechanical properities of cement-based materials was investigated and its mechanism was analyzed by the heat of hydration test, XRD and SEM analysis. The resultsreveal that with the increase of mass fraction of alumina sol, the fluidity of cement mortar specimens decreases continually, the flex-ural and compressive strength of cement mortar specimens cured for different ages increase first and decrease later. When the massfraction of alumina sol is 2%, the strengths reach the peak. The heat flow rate of hydration of cement specimens increases and hydra-tion induction period is shortened when alumina sol is added to cement paste, so as to accelerate the process of hydration of cement.In addition, with alumina sol incorporation, Ca(OH)2generated by hydration of cement is consumed and more C-S-H, C-A-H geland so on that are advantageous to the strength are produced, resulting in that the internal structure of cement mortar specimens be-comes more uniform and denser and its compactness and strength are improved.

关 键 词：铝溶胶 水泥基材料 力学性能 水泥水化 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]