论文部分内容阅读
用XRD、SEM研究了水泥浆体与大理石间的过渡区。结果表明,在距紧贴在大理石表面上呈箔状的Ca(OH)_2约10—15μm处有一AFt富集区。由于AFt的干扰,Ca(OH)_2定向度明显下降;相应地,在该区中I_(Ca(OH)_2)—lgδ图偏离直线,在此区域外,直线关系仍成立。为了完整地描述Ca(OH)_2定向及含量对界面结合的影响,提出了三个半定量参数:Ca(OH)_2特征定向度(I_0)、Ca(OH)_2特征量(Q_0)及影响因子(F),这些参数的变化与强度发展趋势有合理的关系。依据实验资料,绘出了过渡区显微结构及其形成过程的示意图。作者还试图用物理和化学的方法加强过渡区。结果表明,随着Ca(OH)_2定向度降低,过渡区厚度减薄以及C_3A·CaCO_3·11H_2O在过渡区中形成,结合强度增加。
The transition zone between cement paste and marble was studied by XRD and SEM. The results showed that there was an AFt enrichment zone about 10-15 μm away from the foil-like Ca(OH) 2 close to the marble surface. Due to the interference of AFt, the degree of Ca(OH)2 orientation decreased significantly; accordingly, the I_(Ca(OH)_2)-lgδ plot in this region deviated from a straight line. Outside this region, the straight line relationship still holds. In order to fully describe the effect of the orientation and content of Ca(OH)2 on the interfacial bonding, three semi-quantitative parameters were proposed: Ca(OH)2 characteristic orientation degree (I_0), Ca(OH)_2 characteristic quantity (Q_0) and influence. Factors (F), changes in these parameters have a reasonable relationship with the strength development trend. Based on experimental data, a schematic diagram of the microstructure of the transition zone and its formation process is drawn. The author also tried to strengthen the transition zone by physical and chemical methods. The results show that with the decrease of Ca(OH)2 orientation, the thickness of the transition zone decreases and C_3A·CaCO_3·11H_2O forms in the transition zone, and the bond strength increases.