首页|NaOH浓度对地聚物再生骨料混凝土尺寸效应的影响

NaOH浓度对地聚物再生骨料混凝土尺寸效应的影响

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设计了 4种不同立方体尺寸(70 mm、100 mm、150 mm和200 mm)和5种不同NaOH浓度(3 mol/L、5 mol/L、7 mol/L、9 mol/L、11 mol/L)的地聚物再生骨料混凝土试块,研究了不同NaOH浓度条件下的地聚物再生骨料混凝土抗压强度的尺寸效应.通过试验发现:GB/T 50081-2002《普通混凝土力学性能试验方法标准》中规定的换算系数并不适用于地聚物再生骨料混凝土,给出2种方法来进行地聚物再生骨料混凝土尺寸换算系数的取值,第一种是平均数方法:α200=0.93、α100=1.13、α70=0.70,第二种方法采用线性拟合:α200=0.973 5-0.006 5ε、α100=1.044 5+0.012 5ε、α70=0.718-0.002ε;尺寸为 200 mm、150 mm 和 100 mm 的地聚物再生骨料混凝土抗压强度均符合Bazant的尺寸效应理论曲线,采用无量纲的方法可以得到地聚物再生骨料混凝土抗压强度与NaOH浓度和尺寸参数耦合作用影响的预测方程,所提出的方程具有更好的适用性,并且得出了不同NaOH浓度条件下地聚物再生骨料混凝土的临界尺寸和临界强度值.
Influence of NaOH concentration on size effect of geopolymer recycled aggregate concrete
The effect of NaOH concentration(3 mol/L,5 mol/L,7 mol/L,9mol/L,and 11 mol/L)on the size effect of geopolymer recycled aggregate concrete was studied by 4 different size specimens(70 mm,100 mm,150 mm and 200 mm).The results show that the conversion coefficient of geopolymer recycled aggregate concrete cannot be used as specified in GB/T 50081-2002 Standard for Testing Methods for Mechanical Properties of Ordinary Concrete.Two methods were used to evaluate the size conversion coefficient of regenerated aggregate concrete.The first method was the mean method:α200=0.93,α100=1.1 3,α70=0.70.The second method was linear fitting:α200=0.973 5-0.006 5ε,α100=1.044 5+0.012 5ε,α70=0.718-0.002ε.The compressive strength of recycled aggregate concrete of 200 mm,150 mm and 100 mm are in line with the Bazant's theory of size effect curve,adopt the method of dimensionless can get polymer compressive strength of recycled aggregate concrete and NaOH concentration and size parameters of the prediction equation of coupling effect,the applicability of the proposed equation has better,and it is concluded that the different conditions of recycled aggregate beneath gathered the strength of recycled aggregate concrete critical size and critical value.

geopolymer recycled aggregate concretecompressive strengthsize effectNaOH concentration

周静海、苏群、丁兆洋

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沈阳建筑大学土木工程学院,辽宁沈阳 110168

地聚物再生骨料混凝土 抗压强度 尺寸效应 NaOH浓度

国家自然科学基金面上项目住房和城乡建设部科技计划项目硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金

516783742019-K-48SYSJJ2020-15

2024

混凝土
中国建筑东北设计研究院有限公司

混凝土

CSTPCD北大核心
影响因子:0.844
ISSN:1002-3550
年,卷(期):2024.(9)