玻璃粉对粉煤灰复合硬化水泥浆氯离子结合能力影响

发布时间：2018-04-26 10:19

本文选题：玻璃粉 + 粉煤灰　；参考：《混凝土》2017年08期

【摘要】：就玻璃粉对粉煤灰复合硬化水泥浆氯离子结合能力影响进行了研究。首先对0~70%粉煤灰取代量的复合硬化水泥浆在90 d内的氯离子结合性能进行了研究。其次,采用玻璃粉与粉煤灰1∶4的比例以二者混合粉体替代水泥,玻璃粉替代量为0~8%,对玻璃粉-粉煤灰-水泥体系硬化浆体氯离子固定能力进行了研究。并通过XRD物相分析对氯离子结合机理进行了分析。结果表明,在粉煤灰复合水泥硬化浆体中,随粉煤灰对水泥取代量的增大,在不同龄期时,氯离子结合量出现极大值,且该极大值随龄期增长向小取代量方向移动。玻璃粉在粉煤灰复合水泥浆中的加入,有使硬化水泥浆氯离子结合能力降低的趋势。但根据XRD的结果,无论是粉煤灰复合水泥浆还是玻璃粉和粉煤灰复掺的硬化水泥浆,其Friedel盐含量和组成及龄期的关系均和氯离子结合量和同类因素的关系不一致。推测物理吸附对上述两种体系氯离子结合量随组成与龄期变化的规律有更大的影响。
[Abstract]:The effect of glass powder on the chloride binding capacity of fly ash composite hardened cement slurry was studied. The chloride binding properties of the compound hardened cement slurry with 70% fly ash replacement amount in 90 days were studied. Secondly, the ratio of glass powder to fly ash 1:4 was used to replace cement with the mixture of glass powder and fly ash, and the substitution amount of glass powder was 0 ~ 8. The ability of fixing chloride ion in hardened slurry of glass powder fly ash cement system was studied. The mechanism of chloride binding was analyzed by XRD phase analysis. The results show that with the increase of cement substitution amount of fly ash in fly ash composite cement paste, the maximum of chloride binding amount appears at different ages, and the maximum value moves to a small substitution amount with the increase of age. The addition of glass powder in fly ash composite cement slurry has the tendency of decreasing the chloride binding ability of hardened cement slurry. However, according to the results of XRD, the relationship between the content, composition and age of Friedel salt is inconsistent with that of chlorine ion binding capacity and similar factors, whether it is fly ash composite cement slurry or glass powder and fly ash cement slurry mixed with glass powder and fly ash. It is inferred that physical adsorption has a greater influence on the changes of chloride binding capacity with the composition and age of these two systems.
【作者单位】：北京工业大学材料学院;中冶建筑研究总院有限公司;
【基金】：国家自然科学基金(51478018)
【分类号】：TU528

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