再生骨料植生型混凝土物理力学性能及植生特性

Physical Mechanical Properties and Vegetation Characteristics of Recycled Aggregate Vegetation Concrete

摘要:

采用室内物理力学试验和室外植生试验，对不同粒径再生骨料植生型混凝土的物理力学性能和植生特性进行研究。结果表明：再生骨料粒径的增加使植生型混凝土抗压强度和密度降低，孔隙率增加；小粒径（10~15 mm）再生骨料植生型混凝土抗压强度为4.5~7.2 MPa，并随集灰比增加呈先增加后减小的趋势；大粒径（15~25 mm）再生骨料植生型混凝土抗压强度为3.0~4.4 MPa，并随集灰比增加逐渐减小；再生骨料大孔植生型混凝土抗压强度与密度并非绝对呈正比关系，而是与骨料粒径相关；大粒径再生骨料形成的大孔隙率使得黑麦草和高羊茅在植生型混凝土中良好生长。

Abstract:

The physical mechanical properties and vegetation characteristics of vegetation concretes prepared by recycled aggregare with different particle sizes were studied by indoor physical mechanical tests and outdoor vegetation tests. The results show that the increase in recycled aggregate of particle size reduces the compressive strength and density and increases the porosity of vegetation concretes . The compressive strength of vegetation concretes with small particle size （10-15 mm） recycled aggregate is 4.5-7.2 MPa， and shows a trend of increasing first and then decreasing with the increase of aggregate-cement ratio. The compressive strength of vegetation concretes with large particle size （15-25 mm） recycled aggregate is 3.0-4.4 MPa， and gradually decreases with the increase of aggregate-cement ratio. The compressive strength and density of recycled aggregate macroporous vegetation concrete are not absolutely directly proportional， but are related to the particle size of recycled aggregate. Large particle size recycled aggregates create high porosity， allowing ryegrass and tall fescue to grow well in vegetated concretes.