超高强高性能混凝土的力学性能研究

Mechanical Properties of Super High Strength and High Performance Concrete

本文较系统地研究了C100～C150超高强混凝土的各种强度性能及变形性能,包括超高强混凝土的劈拉强度、抗折强度、与钢筋的粘接强度、棱柱体强度、应力-应变曲线特征、变形模量、泊桑比等。研究表明:随着超高强混凝土抗压强度的提高,其劈拉强度、抗折强度与抗压强度的比值,较高强混凝土的低,较普通混凝土的更低。超高强混凝土的应力-应变关系呈直线,受压破坏时呈突然爆炸式破坏,证明了超高强混凝土脆性破坏的比普通混凝土和高强混凝土进一步增大。经过研究,得出了各种强度指标、变形模量及峰值应变与混凝土抗压强度的回归关系式,加深了对超高强混凝土的力学性能的理解和认识。为今后超高强混凝土的应用也奠定了必要基础。

This paper introduces an experimental study on various mechanical properties of C100～C150 super high strength concrete, which include splitting tensile strength, bending strength, bond strength with steel bar, prismatic compressive strength, stress strain relationship, modulus of deformation and Poisson ratio. Results show that with the increase of compressive strength of super high strength concrete, the ratios of its splitting strength and flexural strength to compressive strength are lower than that of high strength concrete and even less than those of ordinary concrete. The stress strain relationship of super high strength concrete appears to be linear, and sudden explosion occurs during compression failure. It illustrates that the brittleness of super high strength concrete is increased. Through case study, this paper presents several regression equations of calculating modulus of deformation and peak strain in terms of its compressive strength for different grades of super high strength concrete. It also offers some important data for utilization of this type of concrete.