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王  鑫，易越磊，孙茂山

 

 

(中国轻工业武汉设计工程有限责任公司，武汉 430060)

摘要：为改善机制砂混凝土的性能并推广其应用，采用单掺和复掺粉煤灰与钢渣粉的方式，研究了掺合料掺量对机制砂混凝土坍落度、抗压强度和劈裂抗拉强度的影响，及最优掺合料配合比机制砂混凝土的微观结构机理。结果表明：单掺粉煤灰或钢渣粉时，机制砂混凝土的坍落度随掺合料掺量增加先升高后降低；机制砂混凝土早期（3、7 d）抗压强度随粉煤灰掺量的增加逐渐降低，随钢渣粉掺量的增加先增加后降低；单掺粉煤灰和钢渣粉分别为5%和10%时，机制砂混凝土的抗压强度和劈裂抗拉强度达到最佳；两者复掺时，最优掺合料配合比机制砂混凝土的28 d抗压、劈裂抗拉强度分别为62.4、2.0 MPa，较基准组混凝土分别提升11.2%、5.3%。单掺适量的钢渣粉或粉煤灰可有效改善机制砂混凝土微观结构，提升其密实度与力学性能；当两者复掺时，优化效应叠加，进一步增强机制砂混凝土性能。研究成果为机制砂混凝土的工程应用提供了理论依据。

关键词：混凝土；粉煤灰；钢渣粉；工作性能；力学性能

中图分类号：TU528.041

文献标志码：A

文章编号：1005-8249（2025）06-0023-06

DOI：10.19860/j.cnki.issn1005-8249.2025-06-005

 

 

WANG Xin,YI Yuelei,SUN Maoshan

 

 

(China Light Industry Wuhan Design Engineering Co.,Ltd.,Wuhan 430060,China)

 

Abstract：To enhance the performance and promote the application of manufactured sand concrete,this study employed single and composite incorporation of fly ash and steel slag powder to investigate the effects of admixture content on the slump,compressive strength,and splitting tensile strength of manufactured sand concrete,as well as the microstructural mechanism of the optimal mixture proportion.The results indicate that when fly ash or steel slag powder was incorporated individually,the slump of manufactured sand concrete initially increased and then decreased with increasing admixture content.The early-age (3,7 d) compressive strength of manufactured sand concrete gradually decreased with higher fly ash content,while it first increased and then decreased with increasing steel slag powder content.The optimal compressive and splitting tensile strengths were achieved at single incorporation rates of 5% for fly ash and 10% for steel slag powder,respectively.Under composite incorporation,the 28 d compressive and splitting tensile strengths of the optimized manufactured sand concrete reached 62.4 and 2.0 MPa,representing improvements of 11.2% and 5.3%,respectively,compared to the reference group.The incorporation of an appropriate amount of steel slag powder or fly ash alone effectively refined the microstructure of manufactured sand concrete,enhancing its compactness and mechanical properties.When both were used together,their optimizing effects synergized,further improving the performance of manufactured sand concrete.This research provides a theoretical foundation for the engineering application of manufactured sand concrete.

 

Key words：concrete;fly ash;steel slagpowder;working performance;mechanical propert

作者简介：王鑫（1992—），男，硕士，高级工程师，一级注册结构工程师，研究方向:建筑结构设计。

收稿日期：2024-09-24