复掺高性能矿物掺合料对高强机制砂混凝土性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (7): 2296-2305.

复掺高性能矿物掺合料对高强机制砂混凝土性能的影响

段承刚¹, 孙永涛²

1.河北省高速公路延崇筹建处,张家口 075000;
2.河北工业大学土木与交通学院,天津 300401

收稿日期:2021-02-01 修回日期:2021-04-03 出版日期:2021-07-15 发布日期:2021-08-04
通讯作者: 孙永涛,硕士研究生。E-mail:972083197@qq.com
作者简介:段承刚(1980—),男,工程师。主要从事公路工程施工方面的研究。E-mail:1480682379@qq.com
基金资助:
河北省交通运输厅科技项目(YC-201905)

Effects of High Performance Mineral Admixtures on Performance of High Strength Manufactured-Sand Concrete

DUAN Chenggang¹, SUN Yongtao²

1. Project Office of Yanchong Highway, Zhangjiakou 075000, China;
2. School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China

Received:2021-02-01 Revised:2021-04-03 Online:2021-07-15 Published:2021-08-04

摘要/Abstract

摘要： 为定量研究S105矿粉与其他矿物掺合料共同作用对C80高强机制砂混凝土的和易性、抗压强度和干燥收缩性能的影响规律,通过试验得到不同龄期(3 d、7 d、28 d、60 d)下,S105矿粉单掺,以及掺S105矿粉的同时以不同含量的微珠、超细矿粉、硅灰分别取代水泥时,高强机制砂混凝土的坍落度、扩展度、抗压强度和干燥收缩率,并利用图表分析及拌合物实际状态对比等对其性能的变化趋势进行分析。结果表明:在一定掺量范围内复掺多种矿物掺合料,有利于提高高强机制砂混凝土的和易性和抗压强度,并显著减小其干燥收缩。在保证混凝土和易性良好的条件下,相比于单掺S105矿粉,S105矿粉与不同矿物掺合料双掺对提高混凝土的综合性能有更显著的作用。综合考虑对和易性、抗压强度和干燥收缩性能的影响,当超细矿粉取代水泥的质量分数为3%时,即水泥与S105矿粉和超细矿粉的质量比为33:11:1时,高强机制砂混凝土的性能处于较好的水平,其粘聚性和流动性都有显著改善,其3 d和60 d抗压强度分别增长3.1%和5.1%,其干燥收缩率则减小了4.0%。

关键词: 高强机制砂混凝土, S105矿粉, 矿物掺合料, 和易性, 抗压强度, 干燥收缩率

Abstract: To analyze the influence law of S105 mineral powder and other mineral admixtures on workability, compressive strength, and drying shrinkage of C80 high strength manufactured-sand concrete quantitatively, the slump, expansion, compressive strength, and drying shrinkage of high strength manufactured-sand concrete at different ages (3 d, 7 d, 28 d, 60 d) were measured. The raw material in the experiment was the mixture of concrete raw material and S105 mineral powder, or the mixture of concrete raw material, S105 mineral powder and mineral admixtures. In the second case, the cement was replaced by microspheres, ultrafine mineral powder or micro-silica with different dosages, respectively. Then, the variation trend of the performance of high strength manufactured-sand concrete was analyzed by the corresponding charts and the actual state of concrete mixture. The result shows that the workability and compressive strength of high strength manufactured-sand concrete are improved, and the drying shrinkage is reduced significantly by adding mineral admixtures in a certain dosage range. Compared with the single mixing of S105 mineral powder, the mixing of S105 mineral powder and different mineral admixtures significantly improve the comprehensive performance of concrete. Meanwhile, the concrete maintains good workability. Considering the influence of workability, strength, and drying shrinkage, when the cement mass dosage replaced by ultrafine mineral powder is 3%, that is, the mass ratio of cement, S105 mineral powder, and ultrafine mineral powder is 33:11:1, the performance of high strength manufactured-sand concrete is at a good level. In this case, the cohesion and fluidity of concrete are significantly improved, the 3 d and 60 d compressive strength increases by 3.1% and 5.1%, respectively, and the drying shrinkage rate decreases by 4.0%.

Key words: manufactured-sand concrete, S105 mineral powder, mineral admixture, working performance, compressive strength, drying shrinkage rate

中图分类号:

TU528

段承刚, 孙永涛. 复掺高性能矿物掺合料对高强机制砂混凝土性能的影响[J]. 硅酸盐通报, 2021, 40(7): 2296-2305.

DUAN Chenggang, SUN Yongtao. Effects of High Performance Mineral Admixtures on Performance of High Strength Manufactured-Sand Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2296-2305.

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