水泥改性乳化沥青混凝土力学性能与微观机理

Mechanical Properties and Microcosmic Mechanism of Cement Modified Asphalt Emulsion Concrete

摘要:

研究了不同水泥用量对乳化沥青混凝土的抗压强度和抗压回弹模量、抗折强度和抗折回弹模量等力学参数的影响.使用红外光谱、X衍射和扫描电子显微镜，研究了水泥乳化沥青胶浆以及混凝土界面的微观结构特征.结果表明,加入水泥后,乳化混凝土力学参数有较大提高,并随着水泥用量增加而增大；水泥与乳化沥青之间没有发生明显的化学反应；水泥与乳化沥青中的水相发生了水化反应,水化产物与水泥在水中的水化产物相同；呈网状的水化产物与沥青通过物理复合形成的水泥沥青胶浆,增大了沥青胶浆的粘度,改善了胶浆与集料界面的粘结,提高了混凝土的力学性能

Abstract:

A study was made of the mechanical properties of ordinary Portland cement modified asphalt emulsion concrete,including compressive strength and compressive modulus,flexural strength and flexural modulus.Bases on infrared spectroscopy analysis,X ray diffraction analysis and scan electron microscopy,an investigation was made into the microstructure characteristics of cement asphalt emulsion mastic and concrete interface.The results show that all mechanical properties of asphalt emulsion concrete improve significantly,when the cement increases.There is no obvious chemical reaction between cement and asphalt emulsion in cement asphalt emulsion mastic,and cement can hydrate with the watery phase of asphalt emlusion.The hydrate products of cement in asphalt emulsion are similar to those in water.The cement asphalt mastic,which is physical compoud mastic by netlike hydrate products and asphalt,improves the adherence of binder aggregation and mechanical properties of asphalt emulsion concrete.