配制参数对结构轻集料混凝土工作性能及力学性能的影响研究

The Influence Study of Preparation Factors on the Workability and Mechanical Properties of Structural Light-weight Aggregate Con

浏览量:

关键词:

轻集料混凝土;体积砂率;矿物掺合料;工作性能;力学性能

Key words:

Light-weight aggregate concrete; Volumetric sand/ceramsite ratio; Mineral admixture; Work ability; Mechanical performance

刊期:

2017年第11期

DOI:

文章编号:

1000-4637(2017)11-10-06

基金项目:

重庆市社会民生科技创新专项基金(cstc2015 shmszx30001)

作者:

王永合1,谢厚礼1,沈 锐2,袁晓峰1

单位:

1.重庆市建设技术发展中心、重庆市建筑节能中心,400015; 2.重庆大学材料科学与工程学院,400045)

摘要

摘   要:系统研究了体积砂率和矿物掺合料对轻集料混凝土工作性能及力学性能的影响。研究结果表明:当体积砂率为40%时,轻集料混凝土具有最优的工作性能;粉煤灰单掺可明显改善轻集料混凝土的工作性能,但掺量达到30%以上时对混凝土力学性能有不利影响;复掺10%或20%矿渣粉和10%粉煤灰可制备具有优良工作性能和力学性能的轻集料混凝土。

Abstract: The effect of volumetric sand/ceramsite ratio and mineral admixture on the work ability and mechanical performance of light-weight aggregate concrete (LWAC) is studied. The results show that LWAC has best work ability when the volumetric sand/ceramsite ratio is 40%; the work ability of LWAC is improved when fly ash is added, while the compressive strength of LWAC decreases when the amount of fly ash is higher than 30%; LWAC mixed by 10% or 20% GGBS and 10% fly ash has a good work ability and mechanical performance.

结论

(1)轻集料混凝土的坍落度随体积砂率增大呈现先增大后减小的趋势,当体积砂率为40%时,轻集料混凝土的坍落度达到最大值254 mm。体积砂率在30%~50%之间时,体积砂率对轻集料混凝土抗压强度的影响无明显的规律。
(2)当矿渣粉掺量为20%~40%时,轻集料混凝土的坍落度可由初始的207mm提高到240mm以上,能明显改善轻集料混凝土的工作性能。低掺量(10%)的矿渣粉可提高轻集料混凝土抗压强度。
(3)粉煤灰的掺入能明显改善轻集料混凝土的工作性能,但掺量超过30%时,混凝土拌和物出现泌水现象;当粉煤灰掺量不超过20%时,可提高轻集料混凝土抗压强度。
(4)矿渣粉和粉煤灰以较低掺量(10%+10%或20%+10%)复掺时,既可以改善轻集料混凝土的工作性能,又能提高轻集料混凝土的抗压强度。

参考文献

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引用本文

王永合,谢厚礼,沈锐,等.配制参数对结构轻集料混凝土工作性能及力学性能的影响研究[J].混凝土与水泥制品,2017(11):10-15.

WANG Y H, XIE H L, SHEN R,et al.The Influence Study of Preparation Factors on the Workability and Mechanical Properties of Structural Light-weight Aggregate Concrete[J].China Concrete and Cement Products,2017(11):10-15.


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