实际生产再生细骨料混凝土力学性能及耐久性能试验研究
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摘要
再生细骨料混凝土是一种新型绿色建筑材料,具有环保和经济价值。作为一种新材料,再生细骨料混凝土性能的优劣直接关系到混凝土结构的质量。采用基于自由水灰比的配合比设计方法成功配制了再生细骨料混凝土,并按5种水灰比、6种再生细骨料取代率分别进行了再生细骨料混凝土工作性能、力学性能和耐久性能试验,探讨了工程应用的可行性。试验表明,再生细骨料混凝土的工作性能基本满足要求;当取代率不大于20%时,其抗压强度、抗拉强度、抗折强度均与普通骨料混凝土相差较小,且其抗渗性能达到P6等级,氯离子渗透性低,抗碳化性能较好,表明其基本性能安全可靠,能够替代普通骨料混凝土。
As a new kind of green building material, recycled fine aggregate(RFA) concrete has environmental protection and economic values. The properties of RFA concrete are related to quality of concrete structures directly. Adopting the mixture ratio design method based on free water-cement ratio, the RFA concrete was successfully produced. Considering five different values of water-cement ratios and six different values of RFA replacement ratios, tests of workability, mechanical properties and durability of the RFA concrete were conducted respectively to discuss feasibility of engineering practice. The experimental results show that the workability of the RFA concrete can basically meet the engineering requirements. When the replacement ratio is smaller than 20%, the compressive strength, tensile strength and flexural strength of the RFA concrete are less different from those of the ordinary concrete. When the replacement ratio is smaller than 20%, the impermeability of the RFA concrete reaches up to grade P6, the permeability of the chloride ion is low, and the carbonation resistance is good. So it can be used to replace the ordinary aggregate concrete.
As a new kind of green building material, recycled fine aggregate(RFA) concrete has environmental protection and economic values. The properties of RFA concrete are related to quality of concrete structures directly. Adopting the mixture ratio design method based on free water-cement ratio, the RFA concrete was successfully produced. Considering five different values of water-cement ratios and six different values of RFA replacement ratios, tests of workability, mechanical properties and durability of the RFA concrete were conducted respectively to discuss feasibility of engineering practice. The experimental results show that the workability of the RFA concrete can basically meet the engineering requirements. When the replacement ratio is smaller than 20%, the compressive strength, tensile strength and flexural strength of the RFA concrete are less different from those of the ordinary concrete. When the replacement ratio is smaller than 20%, the impermeability of the RFA concrete reaches up to grade P6, the permeability of the chloride ion is low, and the carbonation resistance is good. So it can be used to replace the ordinary aggregate concrete.
引文
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[2] 白文辉,王柏生.再生粗骨料混凝土梁受弯计算适用性研究[J].建筑结构,2009,39(8):52-55.
[3] PETER GRUBL,ANDREW NEALEN.Construction of an office building using concrete made from recycled demolition material[J].Aus Darmstadt Concrete,1998,13(6):33-46.
[4] ZEGA C J,DI MAIO A A.Use of recycled fine aggregate in concrete with durable requirements[J].Waste Management,2011,31(11):2336-2340.
[5] 李如雪.再生细骨料应用于混凝土的试验研究[D].银川:宁夏大学,2009.
[6] EVANGELISTA L,BRITO J DE.Mechanical behavior of concrete made with fine recycled concrete aggregates[J].Cements & Concrete Composites,2007,29(5):397-401.
[7] 史巍,候景鹏.再生混凝土技术及其配合比设计方法[J].建筑技术开发,2001,28(8):18-20.
[8] 耿健,孙家瑛,莫立伟,等.再生细骨料及其混凝土的微观结构特征[J].土木建筑与环境工程,2013,35(2):136-140.