西安建筑科技大学学报(自然科学版)

本试验基于0%、50%、100%三种再生粗骨料取代率,研究了取代率对再生保温混凝土360 d龄期内强度的影响,并在现有欧洲EC2模型的基础上进行修正,提出可准确预测再生保温混凝土360 d龄期内抗压强度的模型.研究表明:360 d龄期时RATIC-100的抗压强度是RATIC-50的98%,是RATIC-0的94%,与此同时,RATIC-100的龄期系数是RATIC-50的1.01倍,是RATIC-0的1.24倍.可见再生粗骨料取代率越大,再生保温混凝土的360 d龄期内抗压强度越小,而其后期强度增长速度越快.基于修正模型所得到的再生保温混凝土强度预测曲线与实测曲线的判定系数均大于0.9,表现出较高的拟合度.因此,再生保温混凝土的360 d龄期内抗压强度可以通过本文提出的修正模型得到准确的预测.

In this paper, three kinds of recycled coarse aggregate replacement rates of 0%, 50% and 100% are designed to study the effect of replacement rate on the strength of Recycled Aggregate Thermal Insulation Concrete(RATIC)within 360 days. Based on the existing European EC2 model, a model which can accurately predict the compressive strength of Recycled Aggregate Thermal Insulation Concrete(RATIC)within 360 days is proposed. The research shows that the compressive strength of RATIC-100 is 98% of RATIC-50 and 94% of RATIC-0 at the age of 360 days. At the same time, the age coefficient of RATIC-100 is 1.01 times that of RATIC-50 and 1.24 times that of RATIC-0. It could be observed that the increases of the replacement rate of recycled coarse aggregate caused the compressive strength of Recycled Aggregate decrease, but the higher the replacement rate is, the faster the strength increases in the later period. The determination coefficient of the strength prediction curve of Recycled Aggregate Thermal Insulation Concrete(RATIC)based on the modified model and the measured curve are both greater than 0.9, showing a high degree of fit. In consequence, the compressive strength of RATIC within 360 days can be accurately predicted by the modified model proposed in this paper.

引言
1 试验方案
2 试验结果及分析
3 结论

图1 再生粗骨料级配曲线图<br/>Fig.1 The grading curve of recycled coarse aggregate

图1 再生粗骨料级配曲线图
Fig.1 The grading curve of recycled coarse aggregate

表1 骨料的物理性质<br/>Tab.1 Physical properties of aggregates

表1 骨料的物理性质
Tab.1 Physical properties of aggregates

表2 水泥和硅灰的物理性质<br/>Tab.2 Physical properties of cement and micro-silica

表2 水泥和硅灰的物理性质
Tab.2 Physical properties of cement and micro-silica

表3 玻化微珠物理性质<br/>Tab.3 Physical properties of glazed hollow bead

表3 玻化微珠物理性质
Tab.3 Physical properties of glazed hollow bead

表4 混凝土配合比<br/>Tab.4 The mixture ratio of concrete

表4 混凝土配合比
Tab.4 The mixture ratio of concrete

表5 试件的尺寸和数量<br/>Tab.5 Size and number of specimens

表5 试件的尺寸和数量
Tab.5 Size and number of specimens

图2 不同再生粗骨料取代率混凝土立方体抗压强度<br/>Fig.2 Compressive strength of concrete cubes with different replacement rates of recycled coarse aggregates

图2 不同再生粗骨料取代率混凝土立方体抗压强度
Fig.2 Compressive strength of concrete cubes with different replacement rates of recycled coarse aggregates

图3 不同再生粗骨料取代率的混凝土龄期系数<br/>Fig.3 Concrete age coefficients of different replacement rates of recycled coarse aggregates

图3 不同再生粗骨料取代率的混凝土龄期系数
Fig.3 Concrete age coefficients of different replacement rates of recycled coarse aggregates

图4 棱柱体抗压强度与立方体抗压强度<br/>Fig.4 Compressive strength of concrete prisms and cubes

图4 棱柱体抗压强度与立方体抗压强度
Fig.4 Compressive strength of concrete prisms and cubes

图5 试验实测值与EC2模型预测值<br/>Fig.5 Test measured values and EC2 model predicted values

图5 试验实测值与EC2模型预测值
Fig.5 Test measured values and EC2 model predicted values

图6 试验实测值与EC2修正模型预测值<br/>Fig.6 Test measured values and modified model predicted values

图6 试验实测值与EC2修正模型预测值
Fig.6 Test measured values and modified model predicted values

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备注

引言

1 试验方案

2 试验结果及分析

3 结论

期刊信息