Micro Steel Fiber-Reinforced High-Strength Concrete

High-strength steel fiber reinforced concrete is a cement-based composite material to high-performance composite materials and new development. This high-strength steel fiber reinforced concrete in the preparation of the process of selection of micro-fiber and high-temperature steam curing system, using low water-cement ratio active mineral admixture super plasticizer admixture of the technical approach, was prepared by micro-high-strength steel fiber Concrete. And micro-high-strength steel fiber concrete compressive strength, splitting tensile properties, flexural strength, flexural toughness and tensile properties were directly studied, and discussed the water-cement ratio, steel fiber content, high temperature steam curing system, conservation Age on mechanical properties of steel fiber reinforced concrete impact.1. Micro steel fiber reinforced concrete cube compressive test study. Tests show that the water-cement ratio, steel fiber content and curing conditions on the strength of steel fiber micro cube compressive strength of concrete, water cement ratio is the most important factor, the smaller the water-cement ratio, the more cube compressive strength Large. The addition of fine steel fiber can improve concrete's compressive strength of small amplitude. Steam curing can significantly improve the early strength of soil strength of steel fiber, and 90°60°steam curing system than steam curing system is more conducive to improving the early strength of steel fiber reinforced concrete. Cube strength of concrete increase with the curing period showed a slight increase in late strength without significant attenuation.2. High-temperature steam curing micro-strength concrete test of tensile strength. Tests showed that the addition of fine steel fibers significantly improves the tensile strength of concrete, compared with water-cement ratio and curing system on the micro-coagulation provide high strength steel fiber has little effect on tensile strength, but with the decrease of water-cement ratio and curing period of growth, splitting tensile strength of a small elevation. High-temperature steam curing system can significantly improve the early splitting tensile strength of concrete, splitting tensile strength to maintain stability in post, there was no attenuation of the phenomenon.3. High-temperature steam curing micro-bending performance of steel fiber reinforced concrete experimental study. Test showed that the effect of steel fiber concrete flexural strength is still the main factor, while the smaller when the water-cement ratio, the higher strength of concrete by adding fiber to improve the strength against the more obvious fold. Steam curing can significantly improve the flexural strength of concrete at early, late bending strength of steel fiber reinforced concrete is relatively stable4. High-temperature steam curing micro-strength concrete flexural toughness Study. Tests showed that the addition of steel fibers to make the concrete crack load and ultimate load to increase, while load-deflection curve with the steel fiber content increased the overall trend of fullness, significantly improve the toughness of concrete. Water-cement ratio on the flexural toughness of steel fiber reinforced concrete is also more obvious impact, water-cement ratio decreases, the increased bending strength and toughness of concrete. Steam curing flexural properties of steel fiber reinforced concrete with the increase of curing period increased.5. High-temperature steam curing micro-strength concrete of direct tensile test. The smaller the water-cement ratio of concrete strength is higher the substrate, the higher the uniaxial tensile strength of the specimen.