掺废旧沥青混合料的自密实混凝土性能研究

Research on Properties of Self-compacting Concrete Containing Reclaimed Asphalt Mixture

为测试掺废旧沥青混合料(RAP)、矿渣(S)、粉煤灰(F)自密实混凝土性能,采用坍落度、抗压强度的测试方法,分别对RAP不同掺量和不同矿物掺和料(粉煤灰和矿渣)的自密实水泥混凝土性能进行试验研究。结果表明:RAP对自密实混凝土坍落度的影响较小,而矿物掺和料对其影响较大;随着RAP掺量的增加,自密实混凝土抗压强度逐渐衰减,而矿物掺和料对其强度改善不明显;最后通过对所有抗压强度数据进行回归分析,得到以RAP、粉煤灰(F)和矿渣(S)为自变量的自密实混凝土抗压强度预测模型。

To test properties of the self-compacting concrete containing reclaimed asphalt mixture （ RAP）, slag （S）, and coal ash （F）, the experimental study is performed respectively for properties of the selfcompacting concrete containing different amount of RAP and different mineral additives （ coal ash and slag） by slump and compressive strength tests. The results show that RAP has small impact on the slump of the self- compacting concrete while the mineral additives have larger impact; with the increase of the RAP, the compression strength of the self-compacting concrete reduces gradually, and the mineral additive does not significantly improve the strength. Finally, regression analysis is performed for all compressive strength data to the obtain a compressive strength prediction model for self-compacting concrete based on independent variables such as RAP, coal ash （F） and slag （S）.