骨料与粘合剂之比对红泥改性磷酸镁修补砂浆耐水性的影响

Maoliang Zhang, Xiaorong Zhang, Jianwei Li, Yan Ma, Zheyu Zhu, Junxia Liu
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引用次数: 0

摘要

骨料与粘合剂之比(A/Bs)是设计和制备修补砂浆的一个重要参数。本文系统研究了 A/Bs对红泥改性磷酸镁修补砂浆(RMPM)物理力学性能的影响。通过探究 RMPM 的毛细管吸水特性,进一步阐明了 A/Bs 对其耐水性和力学性能的影响机理。结果表明,随着 A/Bs 的增加,新鲜 RMPM 的流动性降低,凝结时间先缩短后延长。随着 A/Bs 的增加,RMPM 的抗压强度、抗弯强度、界面粘结强度和耐水性先增大后减小,当 A/Bs 为 1.0 时达到最大值。RMPM 的毛细管吸水率与浸泡时间的平方根呈线性关系,其斜率(即毛细管吸水系数)和毛细管孔隙率随着 A/Bs 的增大先减小后增大。毛细管孔隙率与强度保持率呈线性关系,这表明 A/Bs 通过改变毛细管孔隙特性对 RMPM 的耐水性产生了显著影响。当 A/Bs 为 1.0 时,RMPM 的毛细管吸水系数和毛细管孔隙率最低,因此具有适当的力学性能和耐水性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Aggregate-to-Binders Ratio on Water Resistance of Red-Mud-Modified Magnesium Phosphate Repair Mortar
The aggregate-to-binders ratio (A/Bs) is an important parameter for the design and preparation of repair mortars. In this paper, the influences of A/Bs on the physical and mechanical properties of red-mud-modified magnesium phosphate repair mortar (RMPM) were systematically investigated. By exploring the capillary absorption characteristics of RMPM, the effect mechanism of A/Bs on its water resistance and mechanical properties was further clarified. The results indicated that the fluidity of fresh RMPM reduced with an increase in A/Bs, and its setting time was first shortened and then prolonged. The compressive strength, flexural strength, interfacial bonding strength, and water resistance of RMPM increased and then decreased with the increasing A/Bs and reached the maximum when the A/Bs was 1.0. The capillary absorption of RMPM was a linear correlation with the square root of the immersion time, and whose slope, that is, the capillary absorption coefficient, and capillary porosity decreased and then increased with the increase in A/Bs. Capillary porosity had a linear relationship with the strength retention rate, which indicated that A/Bs produced a significant effect on the water resistance of RMPM by modifying its capillary pore characteristics. When the A/Bs was 1.0, RMPM had the lowest capillary absorption coefficient and capillary porosity, and thus possesses appropriate mechanical properties and water resistance.
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