摘要
为制备流动度大,早期抗压强度高的水化硅酸镁水泥,利用正交试验,研究镁硅比(Mg/Si)、水胶比(W/B)、六偏磷酸钠(SHMP)对流动性能、3和28 d抗压强度的影响,进而确定最佳配合比。结果表明:Mg/Si对早期抗压强度以及流动性影响较小,对后期抗压强度影响较大。W/B和SHMP对早期抗压强度以及流动性影响较大。通过极差和方差分析得出水化硅酸镁水泥的最优配合比:Mg/Si为1.2(摩尔比)、W/B为0.41、SHMP为3.4%。利用XRD、SEM等微观测试分析了各因素对水化硅酸镁水泥物相组成和微观形貌的影响,发现优化后试样中的Mg(OH)_(2)含量显著降低,M-S-H凝胶更为均匀密实。
To prepare hydrated magnesium silicate cement with excellent flowability and early compressive strength,orthogonal experiments were conducted to study the effects of magnesium silicon ratio(Mg/Si),water cement ratio(W/B),and sodium hexametaphosphate(SHMP)on flowability and compressive strength at 3 and 28 days,in order to determine the optimal mix ratio.The results indicate that Mg/Si has a small impact on early compressive strength and flowability,but a significant impact on later compressive strength.W/B and SHMP have a significant impact on early compressive strength and flowability.The optimal mix ratio of hydrated magnesium silicate cement was determined through range and variance analysis:Mg/Si of 1.2(molar ratio),W/B of 0.41,and SHMP of 3.4%.The influence of various factors on the phase composition and microscopic morphology of hydrated magnesium silicate cement was analyzed by XRD,SEM and other microscopic tests.It was found that the content of Mg(OH)_(2) in the optimized sample was significantly reduced,and the M-S-H gel was more uniform and dense.
作者
李悦
潘博
李洪文
罗晓
林辉
LI Yue;PAN Bo;LI Hongwen;LUO Xiao;LIN Hui(Beijing University of Technology,Beijing 100124,China;Chongqing Research Institute of Beijing University of Technology,Chongqing 401151,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第11期11230-11236,共7页
Journal of Functional Materials
基金
重庆市自然科学基金(CSTB2022NSCQ-MSX1250)。
关键词
水化硅酸镁水泥
正交试验
流动性
抗压强度
机理分析
hydrated magnesium silicate cement
orthogonal experiment
flowability
compressive strength
mechanism analysis
