摘要:
钢渣中含有C3S、C2S胶凝活性物质,因此经粉磨后,具有用作胶凝物质掺合料的潜质.但是钢渣的安定性差是制约其利用的最重要限制因素之一.本文分别采用沸煮和压蒸方法研究钢渣的比表面积对钢渣-水泥复合胶凝材料净浆安定性的影响;用灰色关联度分析法研究钢渣掺量与比表面积对钢渣-水泥复合胶凝材料净浆安定性的影响程度;通过SEM分析钢渣不同比表面积时,钢渣-水泥复合胶凝材料净浆的微观形貌.研究结果表明,钢渣-水泥复合胶凝材料净浆可以通过提高钢渣的比表面积改善其安定性.钢渣掺量10%时,相较于钢渣比表面积454.99 m2/kg的钢渣-水泥复合胶凝材料净浆,钢渣比表面积为598.43m2· kg的钢渣-水泥复合胶凝材料净浆沸煮膨胀率降低了72.14%,压蒸膨胀率降低了51.40%.灰色关联分析得出与比表面积相比,钢渣掺量对钢渣-水泥复合胶凝材料净浆膨胀率的影响更大.限制钢渣的掺量仍是预防钢渣-水泥复合胶凝材料体积膨胀的主要方法.SEM微观结构分析表明,随着钢渣比表面积的增加,钢渣-水泥复合胶凝材料净浆逐渐趋于致密,此结论与膨胀率评价结果一致.
关键词:
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钢渣
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水泥
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复合胶凝材料
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比表面积
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膨胀率
Abstract:
Steel slag contains C3S,C2S gelling active material,so it has the potential to be used as cementitious material admixture after grinding.However,the poor volumetric stability of steel slag is one of the most important factors which restrict its utilization.In this paper,the effect of specific surface area of steel slag on the volumetric stability of steel slag-cement composite gelling material paste was studied respectively by the method of boiling and autoclaved tests;influencing degrees of content and specific surface area of steel slag on the volumetric stability of steel slag-cement composite gelling material paste were researched by the gray relation grade analysis method;the microstructures of steel slag-cement composite gelling material paste with different specific surface areas of steel slag were analyzed by SEM.The research results show the volumetric stability of steel slag-cement composite gelling material paste can be improved by increasing the specific surface area of steel slag.With 10% content of steel slag,compared with paste with steel slag of 454.99 m2.kg-1 specific surface area,the boiling expansion ratio of paste with steel slag of 598.43 m2· kg-1 specific surface area is reduced by 72.14%;and the autoclave expansion rate is reduced by 51.40%.The gray relation grade analysis indicates that compared with specific surface area,the amount of steel slag has a greater impact on the expansion rate of steel slag-cement composite gelling material paste.Restricting steel slag content is still the main method to prevent the volume expansion of steel slag-cement composite gelling material.SEM microstructure analysis shows that with the increase of the specific surface area of steel slag,steel slag-cement composite gelling material pastes gradually become dense.This conclusion is consistent with the evaluation result of expansion ratio.
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