低温低压养护条件下复合胶凝材料性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0280

摘要/Abstract

摘要： 本研究针对西北高寒地区环境特征,以粉煤灰、矿渣粉为原材料部分替代水泥制备复合胶凝材料。在低温(0、8、15 ℃)及低气压(0.06 MPa)条件下养护,并与标准养护(20 ℃、65 kPa)条件下对比,探究复合胶凝材料力学性能发展及微观结构演化规律。结果表明:复掺粉煤灰和矿渣粉能够产生高效协同效应,但随着温度降低,这一效应逐渐减弱,试样的抗压强度及抗折强度也随之降低;在相同低温条件下,随着粉煤灰掺量的减少和矿渣粉掺量的增加,复合胶凝材料的抗折强度及7、28 d抗压强度逐渐提升,而3 d抗压强度呈先降低后升高的趋势,且当粉煤灰和矿渣粉掺量分别为10％(质量分数)和50％(质量分数)时,抗折强度和抗压强度最大。微观测试结果表明:低温低压养护条件限制了胶凝材料水化反应速率,致使水化产物逐渐减少;随着粉煤灰掺量减少和矿渣粉掺量增加,化学结合水和氢氧化钙的含量逐渐增加,表明矿渣粉的活性成分在低温下依然能够促进水化反应,从而增强胶凝材料的力学性能。

关键词: 矿渣粉, 粉煤灰, 低温低压养护, 力学性能, 微观结构

Abstract: In this study, according to the environmental characteristics of the northwest alpine region, fly ash and slag powder were used as raw materials to partially replace cement to prepare composite cementitious materials. The development of mechanical properties and microstructure evolution law of composite cementitious materials were investigated by curing at low temperature (0, 8, 15 ℃) and low pressure (0.06 MPa) conditions and comparing with standard curing (20 ℃, 65 kPa) conditions. The results show that the mixed fly ash and slag powder can produce efficient synergistic effect, but with the decrease of temperature, this effect gradually weakens, and the compressive strength and flexural strength of sample also decrease. Under the same low temperature conditions, with the decrease of fly ash content and the increase of slag powder content, the flexural strength and 7 and 28 d compressive strength of composite cementitious materials gradually increase, while the 3 d compressive strength decreases first and then increases. When the content of fly ash and slag powder is 10% (mass fraction) and 50% (mass fraction) respectively, the flexural strength and compressive strength are the largest. The microscopic test results show that the low temperature and low pressure curing conditions limit the hydration reaction rate of cementitious materials, resulting in the gradual reduction of hydration products. With the decrease of fly ash content and the increase of slag powder content, the content of chemically bound water and calcium hydroxide gradually increases, indicating that the active components of slag powder can still promote the hydration reaction at low temperature, thereby enhancing the mechanical properties of cementitious materials.

Key words: slag powder, fly ash, low temperature and low pressure curing, mechanical property, microstructure

中图分类号:

TU525

张小龙, 王伟, 姚爱军, 王朝晖, 冯希浩, 王杰. 低温低压养护条件下复合胶凝材料性能研究[J]. 硅酸盐通报, 2025, 44(9): 3295-3304.

ZHANG Xiaolong, WANG Wei, YAO Aijun, WANG Zhaohui, FENG Xihao, WANG Jie. Properties of Composite Cementitious Materials under Low Temperature and Low Pressure Curing Conditions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3295-3304.

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