碱激发剂对单组份碱激发镍渣水泥混凝土抗碳化性能的影响

摘要/Abstract

摘要： 碳化导致混凝土碱度下降,对钢筋混凝土结构的耐久性造成严重危害。本文以Na₂SiO₃、NaOH和Na₂CO₃为碱激发剂,探究碱激发剂种类与其中的Na₂O当量对单组份碱激发镍渣水泥砂浆抗碳化性能的影响规律。研究表明:当Na₂O当量相同时,单组份碱激发镍渣水泥砂浆的抗碳化性能以NaOH单掺组试件最优,Na₂SiO₃单掺组试件最劣;Na₂CO₃取代部分Na₂SiO₃后可提升水泥砂浆试件抗碳化能力,而取代部分NaOH后,水泥砂浆试件抗碳化能力则与Na₂O当量有关;随着Na₂O当量的增加,Na₂SiO₃单掺组与Na₂SiO₃&Na₂CO₃(3∶1)复掺组试件的抗碳化性能呈先增强后减弱的趋势;NaOH单掺组试件前期的抗碳化性能不断增强,试件后期的抗碳化性能呈先增强后减弱的趋势;NaOH&Na₂CO₃(3∶1)复掺组试件前期的抗碳化性能有所改善,但后期的抗碳化性能反而下降。

关键词: 镍渣水泥, 碱激发剂, Na₂O当量, 抗碳化性能, 抗压强度, 单组份

Abstract: Carbonation leads to the decrease of alkalinity of concrete, which seriously harms the durability of reinforced concrete structures. In this paper, Na₂SiO₃, NaOH and Na₂CO₃ were used as alkali activators, and the influences of the types of alkali activators and Na₂O equivalent on the carbonation resistance of single-component alkali-activated nickel slag cement mortar were investigated. The results show that, when the Na₂O equivalent is the same, the carbonation resistance of single-component alkali-activated nickel slag cement mortar is the best in the single doping of NaOH samples, and the carbonation resistance is the worst in the single doping of Na₂SiO₃ samples. Na₂CO₃ partial substitution for Na₂SiO₃ can improve the carbonation resistance of cement mortar samples, while the effect of Na₂CO₃ partial substitution for NaOH on the carbonation resistance of cement mortar specimens is related to the Na₂O equivalent. With the increase of Na₂O equivalent, the carbonation resistance of single doping of Na₂SiO₃ and mixed doping of Na₂SiO₃&Na₂CO₃(3∶1) samples increases first and then decreases. The carbonation resistance of single doping of NaOH samples increases continuously in the early stage, and increases first and then decreases in the later stage. The carbonation resistance of mixed with NaOH&Na₂CO₃ (3∶1) samples improves in the early stage, but decreases in the later stage.

Key words: nickel slag cement, alkali activator, Na₂O equivalent, carbonation resistance, compressive strength, single-component

中图分类号:

TU528.41

王雪芳, 曾天鑫, 周豪杰. 碱激发剂对单组份碱激发镍渣水泥混凝土抗碳化性能的影响[J]. 硅酸盐通报, 2023, 42(3): 1008-1015.

WANG Xuefang, ZENG Tianxin, ZHOU Haojie. Effect of Alkali Activator on Carbonation Resistance of Single-ComponentAlkali-Activated Nickel Slag Cement Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 1008-1015.

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