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用预拌厂废水制备C20~C60混凝土及工程应用
l.Preparation of C20~C60 Concrete Mixed with Waste Water from Mixing Station and Its Project Application
2018年第11期
预拌厂;废水;沉淀废渣;力学性能;耐久性能
Concrete mixing station; Waste water; Sediment residue; Mechanical performance; Durability
2018年第11期
1000-4637(2018)11-97-04
长沙市科技计划项目(kh1701107)
向佳瑜,李 曦,蒋 震,冷 政,袁吉童
中建西部建设湖南有限公司,长沙 410000

向佳瑜,李 曦,蒋 震,冷 政,袁吉童

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摘 要:分析了湖南区域三个混凝土预拌厂废水的理化性质,采用该废水制备了C20~C60混凝土来研究废水对混凝土工作性能、力学性能和关键耐久性能的影响,并在相关指标满足工程应用的要求后,将其应用于工程中。研究表明,三个预拌厂产生的废水及其沉淀废渣各项理化性质相似,成分接近,主要以SiO2、Al2O3和CaO为主。沉淀废渣粒径较小可以改善混凝土体系的颗粒级配;各强度等级的混凝土在废水的最优掺量上存在差异,C30混凝土废水掺量在50%表现出较为优异的工作性,且废水对于中高强度等级混凝土的抗压强度未发现不利的影响;废水可降低混凝土的电通量和提高抗碳化性能,C60废水混凝土6 h总电通量为300 C左右,碳化深度随着废水掺入量的增加而减少。 bstract: According to physical and chemical properties analysis of three concrete mixing stations in Hunan area, the C20~C60 concrete were prepared by adding waste water to study the effects of waste water on working performance, mechanical performance and critical durability of the concrete. The concrete was applied to engineering after relevant indicators met the requirements. The results show that physical and chemical properties of the waste water and sediment residue produced by the three mixing station are similar, and the main composition is SiO2, Al2O3 and CaO. The small particle size of sediment residue can improve the particle gradation of concrete. The concrete with different strength grade has different optimal content of waste water. The 50% waste water content of C30 concrete has excellent working performance, and waste water has no adverse effect on the compressive strength of medium and high strength grade concrete. Waste water can reduce concrete electric flux and improve carbonation resistance. The 6 h total electric flux of C60 concrete by waste water is about 300 C, and the carbonation depth decreases with the increase of the content of waste water.
英文名 : l.Preparation of C20~C60 Concrete Mixed with Waste Water from Mixing Station and Its Project Application
刊期 : 2018年第11期
关键词 : 预拌厂;废水;沉淀废渣;力学性能;耐久性能
Key words : Concrete mixing station; Waste water; Sediment residue; Mechanical performance; Durability
刊期 : 2018年第11期
DOI :
文章编号 : 1000-4637(2018)11-97-04
基金项目 : 长沙市科技计划项目(kh1701107)
作者 : 向佳瑜,李 曦,蒋 震,冷 政,袁吉童
单位 : 中建西部建设湖南有限公司,长沙 410000

向佳瑜,李 曦,蒋 震,冷 政,袁吉童

摘要
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参考文献
引用本文

摘   要:分析了湖南区域三个混凝土预拌厂废水的理化性质,采用该废水制备了C20~C60混凝土来研究废水对混凝土工作性能、力学性能和关键耐久性能的影响,并在相关指标满足工程应用的要求后,将其应用于工程中。研究表明,三个预拌厂产生的废水及其沉淀废渣各项理化性质相似,成分接近,主要以SiO2、Al2O3和CaO为主。沉淀废渣粒径较小可以改善混凝土体系的颗粒级配;各强度等级的混凝土在废水的最优掺量上存在差异,C30混凝土废水掺量在50%表现出较为优异的工作性,且废水对于中高强度等级混凝土的抗压强度未发现不利的影响;废水可降低混凝土的电通量和提高抗碳化性能,C60废水混凝土6 h总电通量为300 C左右,碳化深度随着废水掺入量的增加而减少。

bstract: According to physical and chemical properties analysis of three concrete mixing stations in Hunan area, the C20~C60 concrete were prepared by adding waste water to study the effects of waste water on working performance, mechanical performance and critical durability of the concrete. The concrete was applied to engineering after relevant indicators met the requirements. The results show that physical and chemical properties of the waste water and sediment residue produced by the three mixing station are similar, and the main composition is SiO2, Al2O3 and CaO. The small particle size of sediment residue can improve the particle gradation of concrete. The concrete with different strength grade has different optimal content of waste water. The 50% waste water content of C30 concrete has excellent working performance, and waste water has no adverse effect on the compressive strength of medium and high strength grade concrete. Waste water can reduce concrete electric flux and improve carbonation resistance. The 6 h total electric flux of C60 concrete by waste water is about 300 C, and the carbonation depth decreases with the increase of the content of waste water.

关键词:
预拌厂;废水;沉淀废渣;力学性能;耐久性能
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(1)选取的三个预拌厂废水及其沉淀废渣的各项物理化学性能相似,成分十分接近,主要以SiO2、Al2O3和CaO为主,Ca(OH)2、SiO2、CaCO3、CaSO4·2H2O衍射峰较明显;沉淀废渣结构较疏松,粒径较小,可较好补充混凝土体系的颗粒级配,提高密实度。
(2)各强度等级混凝土在废水最优掺量上存在差异,C30混凝土在废水掺量为50%时表现出较为优异的工作性,掺量在70%以上时坍落度和扩展度损失大于未掺废水混凝土;C40混凝土掺入在废水掺时为30%时,抗压强度可提高约5%;废水对C50、C60混凝土的抗压强度未发现不利影响。
(3)废水的掺入可有效降低C20~C60混凝土的电通量,C60混凝土全部使用废水时,电通量可降低至300 C左右;掺废水的混凝土比未掺废水混凝土的碳化深度要小,且碳化深度随废水掺量的增加而减少。
 
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[4] A. Elahi, P.A.M. Basheer, S.V. Nanukuttan. Mechanical and durability properties of high performance concretes containing supplementary cementitious materials[J]. Construction and Buil ding Materials,2010,24:292-299.
[5] 向佳瑜,袁吉童,冷政,等.基于梯度设计的地铁管片混凝土抗渗性能研究[J].混凝土与水泥制品,2017(10):15-17.
[6] 吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999.
 

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