Properties of Composite Cementitious Materials under Low Temperature and Low Pressure Curing Conditions

doi:10.16552/j.cnki.issn1001-1625.2025.0280

Abstract

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

CLC Number:

TU525

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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