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本文用GPC方法对加有各种无机络合离子或有机硅烷偶联剂的高强水泥石(抗压强度在2000kg/cm~2以上)进行硅酸聚合度分析,并用压汞法对室温及高温水热养护的二组不同试样进行孔分布测定,还测定了各试样的结合水,以研究在低孔率时水泥石中硅酸聚合度的变化及其对力学行为的影响。实验表明,本研究所用的外加剂对水泥石硅酸盐结构具联结或配位作用,导致聚合度增加,力学强度随聚合度(以重均分子量表示)增大而提高。孔率越低,这种聚合度对强度的影响就越大。实验还表明,在分子级层次上,通常的强度-孔率关系不再存在,而可能代之以强度-聚合度关系。
In this paper, the degree of polymerization of silicic acid was studied by GPC method on cemented carbides with various inorganic complex ions or organic silane coupling agents (compressive strength 2000kg/cm~2), and mercury and mercury were used for room temperature and high temperature. Two different sets of samples for hydrothermal curing were used to measure the pore distribution, and the binding water of each sample was also measured to study the change of silicic acid polymerization degree and its effect on mechanical behavior in cement paste at low porosity. Experiments show that the additives used in this study have a linking or coordination effect on the silicate structure of the cement stone, leading to an increase in the degree of polymerization, and the mechanical strength increases as the degree of polymerization (expressed as a weight average molecular weight) increases. The lower the porosity, the greater the effect of this degree of polymerization on strength. Experiments have also shown that at the molecular level, the usual strength-porosity relationship no longer exists, but instead strength-polymerization relationships may be substituted.