微观力学
材料科学
极限抗拉强度
延展性(地球科学)
复合材料
微尺度化学
纤维混凝土
胶凝的
应变硬化指数
抗压强度
硬化(计算)
纤维
结构工程
作者
Ravi Ranade,Victor C. Li,Michael D. Stults,Todd S. Rushing,Jason Roth,William F. Heard
出处
期刊:Aci Materials Journal
日期:2013-07-01
卷期号:110 (4): 375-384
被引量:19
摘要
This paper reports the microscale investigation of a new fiber-reinforced cementitious composite, high-strength, high-ductility concrete (HSHDC), which possesses a rare combination of very high compressive strength (166 MPa [24.1 ksi]) and very high tensile ductility (3.4% strain capacity). The investigation involved experimental determination of fiber/matrix interaction properties using single-fiber pullout tests. A new mechanism of inclination-dependent hardening in fiber pullout—unique for a high-strength cementitious matrix—is discovered. The existing fiber-pullout analytical model for strain-hardening cementitious composites (SHCCs) is modified to incorporate the new mechanism. The modeled fiber-pullout behavior is used in a scale-linking model to compute the crack bridging (σ-δ) relation of HSHDC, which is also empirically verified through single-crack tests. The σ-δ relation of HSHDC satisfies the micromechanics-based necessary strength and energy conditions of steady-state flat crack propagation that prevent localized fracture. The microscale investigation of HSHDC in this research thus demonstrates the rational basis for its design combining both high compressive strength and high tensile ductility.
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