再生粗骨料混凝土压缩徐变特性的研究

陈俊博

doi:10.13204/j.gyjzG20052201

再生粗骨料混凝土压缩徐变特性的研究

doi: 10.13204/j.gyjzG20052201

陈俊博

郑州信息科技职业学院基建处, 郑州 450046

基金项目:

河南省教育厅科学研究项目（15A510034）。

详细信息

作者简介:
陈俊博,女,1979年出生,硕士,讲师。电子信箱:wcp18613718112@163.com

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出版历程
- 收稿日期: 2020-05-22
- 网络出版日期: 2021-11-11

STUDY ON COMPRESSIVE CREEP PROPERTIES OF RECYCLED COARSE AGGREGATE CONCRETE

CHEN Junbo

Zhengzhou Vocational University of Information and Technology, Zhengzhou 450046, China

摘要

摘要: 通过对再生粗骨料取代率为0%、50%、100%的混凝土试件进行徐变试验，研究再生粗骨料混凝土的徐变特性。结果表明：再生粗骨料混凝土的基本徐变和总徐变都随再生粗骨料取代率增大而增大，并且再生粗骨料取代率对再生粗骨料混凝土总徐变的影响大于对基本徐变的影响。基于试验结果，分析了徐变过程中的再生粗骨料、新砂浆、旧砂浆的相互作用机理，引入了新砂浆、旧砂浆与再生粗骨料混凝土徐变的关系计算模型，即修正的Neville徐变模型。利用该模型，计算了旧砂浆在再生粗骨料混凝土基本徐变和总徐变过程中的徐变量。基于ANSYS软件，建立了再生粗骨料混凝土的二维随机凸集料模型，以验证修正的Neville徐变计算模型的可靠性，并采用该有限元模型，分析再生粗骨料随机分布对再生粗骨料混凝土徐变的影响。最后，基于提出的修正Neville模型，建立了能够计算旧砂浆徐变、反映旧砂浆含量和性能的再生粗骨料混凝土徐变预测模型。
- 再生粗骨料混凝土 /
- 基本徐变 /
- 总徐变 /
- 二维随机凸集料模型
Abstract: According to replacement rates of recycled coarse aggregate (RCA) of 0%, 50%, 100%, the compressive creep tests of recycled course aggreagte concrete were conducted. The creep properties of recycled coarse aggregate concrete (RAC) were studied. The experimental results indicated that both of the basic creep and total creep of RAC increased with the increase of replacement rates of RCA, and the effect of replacement rates on total creep of RAC was bigger than that of basic creep. Based on the experimental results, the interaction mechanism recycled coarse aggregate, the new mortar and old mortar in the creep process of RAC was studied, a creep calculation model reflecting the creep relation of new mortar, old mortar and RAC was introduced,which was the modified Neville creep model, and the creep of old mortar in the basic creep or the total creep process of RAC was calculated by the modified creep model. Based on software ANSYS, a two-dimensional random convex aggregate model of RAC was put forward to verify the reliability of the modified creep model. In addition, the influence of the random distribution of RCA on the creep of RAC was studied by the finite element model. Finally, a creep prediction model was constructed, which could be used to compute the creep of old mortar and RAC, and also reflect the content and properties of the old mortar in RAC based on the modified creep model.
- recycled coarse aggregate concrete /
- basic creep /
- total creep /
- two-dimensional random convex aggregate model

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参考文献(19)

[1]	KOU S C, POON C S. Enhancing the Durability Properties of Concrete Prepared with Coarse Recycled Aggregate[J]. Construction and Building Materials, 2012, 35:69-76.
[2]	SILVA R V, BRITO J D, DHIR R K. Comparative Analysis of Existing Prediction Models on the Creep Behaviour of Recycled Aggregate Concrete[J]. Engineering Structures, 2015, 100:31-42.
[3]	CABO A D, LÁZARO C, GAYARRE F L, et al. Creep and Shrinkage of Recycled Aggregate Concrete[J]. Construction and Building Materials, 2009, 23(7):2545-2553.
[4]	肖建庄, 杨洁. 玻璃纤维增强塑料约束再生混凝土轴压试验[J]. 同济大学学报(自然科学版), 2009, 37(12):1586-1591.
[5]	肖建庄, 许向东, 范玉辉. 再生混凝土收缩徐变试验及徐变神经网络预测[J]. 建筑材料学报, 2013, 16(5):752-757.
[6]	白国良, 秦朝刚, 张玉, 等. 再生混凝土梁长期受荷时随变形计算方法研[J]. 土木工程学报, 2016, 49(12):1-8.
[7]	罗素蓉, 叶世昌, 黄海生. 再生混凝土早龄期拉伸徐变试验研究[J]. 建筑材料学报, 2018, 21(2):228-234.
[8]	FATHIFAZL G, RAZAQPUR A G, ISGOR O B, et al. Creep and Drying Shrinkage Characteristics of Concrete Produced with Coarse Recycled Concrete Aggregate[J]. Cement and Concrete Composites, 2011, 33(10):1026-1037.
[9]	ABBAS A, FATHIFAZL G, ISGOR O B, et al. Durability of Recycled Aggregate Concrete Designed with Equivalent Mortar Volume Method[J]. Cement and Concrete Composites, 2009, 31(8):555-563.
[10]	罗俊礼, 徐志胜, 谢宝超. 不同骨料等级再生混凝土的收缩徐变性能[J]. 中南大学学报(自然科学版), 2013, 44(9):3815-3822.
[11]	霍俊芳, 李晨霞, 侯永利, 等. 再生粗骨料混凝土收缩徐变性能试验[J]. 硅酸盐通报, 2017, 36(2):723-726.
[12]	罗素蓉, 郑欣, 黄海生. 再生粗骨料预处理及再生混凝土徐变试验研究[J]. 建筑材料学报, 2016, 19(2):242-247.
[13]	肖建庄, 范玉辉. 再生混凝土徐变试验及机理的模型化分析[J]. 建筑科学与工程学报, 2012, 29(4):18-24.
[14]	中华人民共和国国家质量监督检验检疫总局.通用硅酸盐水泥:GB 175-2007[S]. 北京:中国标准出版社, 2007.
[15]	中华人民共和国国家质量监督检验检疫总局.建设用卵石、碎石:GB/T 14685-2011[S]. 北京:中国标准出版社, 2011.
[16]	中华人民共和国住房和城乡建设部.普通混凝土配合比设计规程:JGJ 55-2011[S]. 北京:中国建筑工业出版社, 2011.
[17]	中华人民共和国建设部.普通混凝土长期性能和耐久性能试验方法标准:GBT 50082-2009[S]. 北京:中国建筑工业出版社, 2009.
[18]	PICKETT G. Effect of Aggregate on Shrinkage of Concrete and a Hypothesis Concerning Shrinkage[J]. ACI Structural Journal, 1956, 27(5):581-590.
[19]	ARMAGHANI D J, MOHAMAD E T, MOMENI E, et al. Prediction of the Strength and Elasticity Modulus of Granite Through an Expert Artificial Neural Network[J]. Arabian Journal of Geosciences, 2016, 9(1):1-16.