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  

Adaptable Design Theory and Reliability Verification of an Ecological High Ductility Cementitious Composites: Part Ⅰ,Adaptable Design Theory

作　　者：郭丽萍[1,2,3] 谌正凯 陈波 杨亚男[1] GUO Liping;CHEN Zhengkai;CHEN Bo;YANG Yanan(School of Materials Science & Engineering,Southeast University,Nanjing 211189;Jiangsu Key Laboratory of Construction Materials,Nanjing 211189;Collaborative Innovation Center for Advanced Civil Engineering Materials,Nanjing 211189;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029)

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]江苏省土木工程材料重点实验室,南京211189 [3]江苏省先进土木工程材料协同创新中心,南京211189 [4]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,南京210029

出　　处：《材料导报》2019年第5期744-749,共6页Materials Reports

基　　金：国家重点研发计划(2018YFC0406702);国家自然科学基金(51778133;51438003;51739008);973项目(2015CB655102);江苏省六大人才高峰计划(JZ-004);福建省交通科技项目(2017Y057)~~

摘　　要：目前,国内普遍使用多元化固体废弃物粉末和自主研发的高强高模合成纤维来制备生态型高延性水泥基复合材料(Ecological high ductility cementitious composites, Eco-HDCC)。然而,原有高延性水泥基复合材料经典设计理论中的理论判据与现有Eco-HDCC材料的实际情况不完全相符,已不能适用于这类多元复合Eco-HDCC材料的可靠性设计与性能调控,因此,迫切需要对该经典材料设计理论进行修正和优化。本研究引入纤维分散系数和主裂缝断面有效纤维体积率两个修正参数,重新限定四个控制参数的取值范围,对经典HDCC设计理论进行了优化修正,并通过测试典型配比Eco-HDCC的宏观力学性能、微观力学性能与纤维分散度,评价可适性设计理论的合理性。研究结果证明,当采用本研究修正后的可适性设计理论并将关键设计参数取值范围控制于0.75≤α~*≤1、V_(f,effect)>1.5%、PSH_1>2.0、PSH_2>1.2时,Eco-HDCC材料可稳定实现高延性(单轴拉伸荷载下的极限应变超过2%)和多缝开裂的特性。本研究结果不仅可使采用多元化固体废弃物粉末和国内自主研发的高强高模PVA纤维制备的Eco-HDCC复合材料的设计过程更加有据可依、灵活可靠,而且能使其满足不同延性和性价比的工程需求,具有重要的理论意义和工程指导价值。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 indexα*of 0.75-1,effective fiber volume fraction V f,effect>1.5%,energy safe margin PSH 1>2.0,stress safe margin PSH 2>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.

关 键 词：生态型高延性水泥基复合材料 可适性设计理论 有效纤维体积率 纤维分散系数 微观力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]