可用于无钢筋建造的超强超韧水泥基复合材料

High Strength UltraHigh Ductile Cementitious Composite Developed for SteelFree Construction

摘要:

基于断裂力学的设计理念，使用活性粉末，并以高强、高弹性模量的聚乙烯纤维作为增强材料，制备具有超高强度和超高延性的纤维水泥基复合材料(UHDCC).轴向拉伸试验、轴压试验、弹性模量试验和四点弯曲试验结果表明，UHDCC的极限拉应力强度可达20 MPa，对应的平均拉伸应变接近9%，轴向抗压强度超过110 MPa.四点弯曲试验结果表明，UHDCC的无筋整浇梁的弯曲性能达到配筋率1.5%的普通钢筋混凝土梁的水平，且具有良好的延性.

Abstract:

In this paper, an ultrahigh ductile cementitious composite （UHDCC）with a mixture of reactive powder is prepared based on the design concept of fracture mechanics. High strength and high modulus polyethylene fiber is used as reinforced materials in the composite. Axial compression test, elastic modulus test and fourpoint bending test are conducted to prove that the ultimate tensile stress strength of the material is up to 20 MPa, the corresponding average tensile strain is close to 9%, and the axial compressive strength exceeds 110 MPa. It is proved by fourpoint bending test that the flexural performance of UHDCC beam reaches the level of ordinary reinforced concrete beam with 1.5% reinforcement ratio and its ductility is good.