鋼纖維與玻璃纖維對高強度透水混凝土的影響

This study includes high strength pervious concrete and ordinary strength pervious concrete. The high strength pervious concrete uses #1 or #1.2 of a single particle size Yilan stone as the aggregate material. The mixtures of high strength pervious concrete were improved by reducing the water-to-binder ratio and adding silica fume and superplasticizer. The high strength pervious concretes aim to carry out 28-day compressive strength above 42 MPa and porosity as close to 15% as possible to achieve the technical specifications. Both high strength and ordinary strength pervious concrete specimens reinforced with glass fiber (volume ratio 0.25%, 0.5%) and steel fiber (1%, 2%) were observed and investigated in the compressive strength, flexural strength, elastic modulus, and toughness tests. The test results show that high-strength pervious concrete with sufficient glass fiber and steel fiber could increase the compressive strength. However, the compressive strength of low-fiber content is lower than those ones without fiber. The flexural strength of pervious concrete will also increase as the curing age increases. However, the flexural strength of pervious concrete with glass fiber or steel fiber does not follow this trend due to large variation by quality control of pervious concrete with different fibers. Regardless of whether the high-strength pervious concrete mixture is improved or not, the modulus of elasticity is very close to 3795√fc'. The steel fiber can be the effective material to improve the bending strength and toughness properties of the pervious concrete. The results show about 30% of the bearing capacity gradually decreases after the peak strength until it is completely destroyed.