| 摘要: |
| 基于再生粗骨料吸附砂浆定量分析及文献数据，研究吸附砂浆含量变化与再生粗骨料物理性能之间的关系，以及再生粗骨料取代率为100%的再生混凝土在不同吸附砂浆含量下的力学性能演化规律；以吸附砂浆含量为自变量、力学性能为因变量、目标强度为限值，利用数学方法确定吸附砂浆界限含量.研究发现：随着吸附砂浆含量的增加，再生粗骨料的物理性能逐渐下降；再生混凝土的抗压强度、劈裂抗拉强度和弹性模量随吸附砂浆含量的增加而出现不同程度的降低，吸附砂浆含量对再生混凝土劈裂抗拉强度的影响要大于对其抗压强度的影响，弹性模量受吸附砂浆含量影响，试验结果波动较大；经过数值拟合后，再生混凝土抗压强度和劈裂抗拉强度与吸附砂浆含量呈二次函数关系，弹性模量与吸附砂浆含量的关系符合Boltzmann公式.基于拟合结果，确定满足C40再生混凝土抗压强度、劈裂抗拉强度及弹性模量的吸附砂浆界限含量分别为45%、43%和39%. |
| 关键词: 再生混凝土 再生粗骨料 吸附砂浆 力学性能 界限含量 |
| DOI：103969/j.issn.1007 9629202103006 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51278073，51878081，52078068)；硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2020 14)；常州市重点研发计划(应用基础研究)项目(CJ20200079) |
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| Limit Content Analysis of Adhesion Mortar Based on Mechanical Properties |
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WANG Zhen, WANG Xinjie, ZHU Pinghua, LIU Shaofeng
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Department of Civil Engineering, Changzhou University, Changzhou 213164, China
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| Abstract: |
| Based on quantitative analysis of adhesion mortar on recycled coarse aggregate and literature data, the relationship between its content change and physical properties of recycled coarse aggregate were studied. The rule of mechanical properties of concrete with 100% recycled coarse aggregate and different adhesion mortar content was determined. Taking the adhesion mortar content as independent variable, the mechanical properties as dependent variable and the target strength as the limit value, the limit content was determined by mathematical method. It is found that the physical properties of recycled coarse aggregate decreases with the increase of adhesion mortar content. The compressive strength, splitting tensile strength and elastic modulus of recycled coarse aggregate concrete decrease with the increase of adhesion mortar content. The effect of adhesion mortar content on splitting tensile strength is greater than that of compressive strength. The elastic modulus fluctuates greatly under the influence of mortar content. After numerical fitting, the relationships between compressive strength, splitting tensile strength and adhesion mortar content are quadratic. The relationship between elastic modulus and adhesion mortar content are accorded with Boltzmann formula. Based on the fitting results, it is determined that the limit contents of adhesion mortar satisfying compressive strength, splitting tensile strength and elastic modulus of C40 recycled coarse aggregate concrete are 45%, 43% and 39% respectively. |
| Key words: recycled aggregate concrete recycled coarse aggregate adhesion mortar mechanical property limit content |
