再生砂混凝土毛细吸水特性研究

摘要/Abstract

摘要： 为了探明再生砂混凝土的毛细吸水特性,研究了再生砂掺量(0%、30%、50%、70%、100%,质量分数)、再生砂微粉含量(3%、7%、10%,质量分数)、水胶比(0.37、0.45、0.58)、矿物掺合料品种和掺量、再生砂预湿程度(0%、50%、100%)、硅烷浸渍处理等因素对再生砂混凝土抗压强度与毛细吸水性能的影响,分析了不同再生砂掺量的混凝土孔结构与毛细吸水系数的关系。结果表明:再生砂混凝土0~240 min和240~1 440 min两阶段的毛细吸水量皆与时间的平方根之间呈线性关系;随着再生砂掺量和微粉含量的增加,混凝土的毛细吸水系数逐渐增大,再生砂掺量超过50%时,会显著影响混凝土的毛细吸水性能和强度;通过降低水胶比、增大再生砂的预湿程度、掺入三元复合矿物掺合料(15%粉煤灰+15%矿渣粉+8%硅灰)以及对混凝土表面进行硅烷浸渍处理,均可以降低再生砂混凝土的毛细吸水系数。随着再生砂掺量的增加,混凝土的孔隙率和临界孔径增大,进而导致混凝土毛细吸水系数增加。

关键词: 再生砂混凝土, 毛细吸水, 强度, 影响因素, 孔结构

Abstract: In order to investigate the capillary water absorption characteristics of recycled sand concrete, the influences of these factors, such as replacement ratio of recycled sand (0%, 30%, 50%, 70%, 100%, mass fraction), fine powder content in the recycled sand (3%, 7%, 10%, mass fraction), water-binder ratio (0.37, 0.45, 0.58), type and content of mineral admixture and pre-wetting degree of recycled sand (0%, 50%, 100%) as well as silane immersion treatment, on compressive strength and capillary water absorption performance of recycled sand concrete were investigated. The relationship between pore structure and capillary water absorption coefficient of concrete with different content of recycled sand was analyzed. The results show that the capillary water absorption of recycled sand concrete in the two stages of 0~240 min and 240~1 440 min is linear with the square root of time. With the increase of replacement ratio of recycled sand and fine powder content, the capillary water absorption coefficient of concrete increases gradually. When the replacement ratio of the recycled sand exceeds 50%, the capillary water absorption and strength of concrete will be significantly affected. The capillary water absorption coefficient of recycled sand concrete decreases by reducing the water-binder ratio, increasing the pre-wetting degree of recycled sand, adding ternary composite mineral admixtures (15% fly ash+15% slag powder+8% silica fume) and impregnating the surface of concrete with silane. With the increase of replacement ratio of recycled sand, the porosity and critical pore size of concrete increase, which leads to the increase of capillary water absorption coefficient of concrete.

Key words: recycled sand concrete, capillary water absorption, strength, influencing factor, pore structure

中图分类号:

TU528.01

殷实, 李北星, 陈鹏博, 金德川. 再生砂混凝土毛细吸水特性研究[J]. 硅酸盐通报, 2023, 42(4): 1205-1216.

YIN Shi, LI Beixing, CHEN Pengbo, JIN Dechuan. Capillary Water Absorption Characteristics ofRecycled Sand Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1205-1216.

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