再生粗骨料性能指标及其线性拟合适用性讨论

Properties of recycled coarse aggregate and discussing the applicability of linear fitting

采用试验方法测试了再生骨料与天然骨料的经时吸水率,揭示了再生骨料的吸水率相对天然骨料更高,且天然骨料的吸水率在短时间内可以达到平稳,而再生骨料的吸水率在24 h后仍然在缓慢增加。并且利用再生粗骨料取代部分天然骨料的方式配置成混合骨料,证明了利用混合定律来预测混合骨料的物理性能是有效的。通过对试验数据加上源自不同文献的45个测试数据的分析,结果表明利用线性拟合来表达吸水率与表观密度的关系是可行的,而吸水率与压碎指标之间的数值关系离散性大,难以拟合。

Testing on water absorption at different soaking durations longer than 24 h, showing that the value of water absorption of RCA is higher than NCA＇s, and the rate of, water absorption is becoming slow over time.Results show that the rules of mixtures can be used to predicts the physical properties of granular mixes （natural gravels＋recycled gravels ）.Relationships are established between water absorption and the other two properties on the basis of the obtained experimental results, combined with the 45 literature data.It can be con- cluded that, using a linear relationship expressing the relationship between water absorption and apparent dentist is appropriate, however, it is not suitable for water absorption and crush value.