生态型高延性水泥基复合材料的可适性设计理论与可靠性验证Ⅰ:可适性设计理论

doi:10.11896/cldb.201905003

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Abstract Currently, various recycled solid waste powders and domestic designed synthetic fibers with high tensile strength and high modulus are widely used for preparing ecological high ductility cementitious composites (Eco-HDCC) in China. However, the theoretical criterion in classical design theory of HDCC is out of touch with the actual situation of the present Eco-HDCC materials, and can not be fully applied to the reliability design and performance control of multicomponent composite Eco-HDCC materials. Consequently, there is an urgent need for modifying and optimizing the classical design theory of HDCC. In this study, the classic design theory of HDCC was reformed by introducing two modified parameters, namely fiber dispersion coefficient and effective fiber volume ratio of main crack section, and limiting the value ranges of four key parameters according to theoretical calculation and test results. The reasonableness of design theory of suitability was evaluated by testing the mechanical pro-perties, micro-mechanical behaviors and fiber dispersion effect of the designed Eco-HDCCs with typical mix proportions. It could be proved by the results that Eco-HDCC held a steady performance of high ductility (the average ultimate tensile strain exceeds 2%) and featured multiple cracks when the modified design theory was adopted, and the value of four key parameters were carefully controlled within the optimizing range (namely, fiber dispersion index α^* of 0.75—1, effective fiber volume fraction Vf,effect>1.5%, energy safe margin PSH₁>2.0, stress safe margin PSH₂>1.2). Accordingly, the results of this study can not only make design process of the Eco-HDCC composites prepared by various types of solid wastes and domestic synthetic fibers with high strength and high modulus be more reliable and flexible, but also satisfy different engineering demands of ductility and performance-price ratio, which exhibit important theoretical significance and engineering guidance value.

Key words： ecological high ductility cementitious composites adaptable design theory effective fiber volume fraction dispersion index of fiber micro-mechanical properties

Published: 12 March 2019

CLC number:

TU528

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	Articles by authors
	GUO Liping
	CHEN Zhengkai
	CHEN Bo
	YANG Yanan

Cite this article:

GUO Liping,CHEN Zhengkai,CHEN Bo, et al. Adaptable Design Theory and Reliability Verification of an Ecological High Ductility Cementitious Composites: Part Ⅰ, Adaptable Design Theory[J]. Materials Reports, 2019, 33(5): 744-749.

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http://www.mater-rep.com/EN/10.11896/cldb.201905003 OR http://www.mater-rep.com/EN/Y2019/V33/I5/744

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