再生粗骨料取代率对塑性混凝土性能的影响

Effect of Replacement Percent of Recycled Coarse Aggregate on Properties of Plastic Concrete

建筑废弃物制成粗骨料进行再利用是减小其危害的一种有效方法。为了研究再生粗骨料取代率对塑性混凝土变形和破坏特征的影响,选择废弃混凝土和废弃砖瓦制成两种粗骨料,粗骨料取代率分别取0%、30%、50%、80%和100%,通过不同粗骨料取代率的塑性混凝土试件的单轴压缩试验,分析其力学性能的变化规律。试验结果表明,再生粗骨料的取代率越高,塑性混凝土的强度越低,峰值应变及体积应变最大值越大。废弃混凝土和废弃砖瓦作为再生粗骨料的塑性混凝土在拌合物和易性、单轴强度、变形性能等方面均满足塑性混凝土的使用需求,考虑其力学性能及经济效益,建议使用粗骨料取代率为50%的砖瓦类再生粗骨料配制塑性混凝土。

The reuse of coarse aggregate made from waste construction waste is an effective method to reduce the harm of construction waste.In order to study the effect of recycled coarse aggregate replacement rate on the deformation and damage characteristics of plastic concrete,two types of coarse aggregates were selected from waste concrete and waste brick tile,,and their replacement percent is 0%、30%、50%、80%and 100%respectively.It has been done on effects on mechanical properties of plastic concrete by recycled coarse aggregates using uniaxial compressive stress-strain curve.The test results show that the higher the replacement rate of recycled coarse aggregate,the lower the strength of plastic concrete and the higher the peak and volume strain maximums.The plastic concrete made from waste concrete and waste bricks and tiles as recycled coarse aggregate meets the requirements of plastic concrete in terms of mix compatibility,uniaxial strength and deformation properties.Considering its mechanical properties and economic benefits,it is suggested to use recycled coarse aggregate with a replacement percent of 50%for brick tile to prepare plastic concrete.