钢纤维地聚物再生混凝土力学性能及强度指标换算  

Mechanical Properties and Strength Index Conversion of Steel Fiber Geopolymeric Recycled Concrete

作　　者：董硕[1,2] 郑立森 史奉伟 王来 刘哲[3] DONG Shuo;ZHENG Lisen;SHI Fengwei;WANG Lai;LIU Zhe(Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590 [3]山东建筑大学土木工程学院,济南250101

出　　处：《材料导报》2025年第7期96-103,共8页Materials Reports

基　　金：山东省自然科学基金(ZR2023QE307;ZR2024QE480);中国博士后科学基金(2023M742143);国家资助博士后研究人员计划(GZC20231497);青岛市自然科学基金(24-4-4-zrjj-75-jch)。

摘　　要：以再生粗骨料替换率(0%~100%)和钢纤维体积掺量(0%~1.5%)为主要变量,设计制作了240个钢纤维地聚物再生混凝土(SFGRC)试件,并进行各项基本力学性能试验及微观形貌观测。研究结果表明:采用再生粗骨料替换天然骨料,混凝土的各项基本力学性能均会降低。当钢纤维体积掺量为1.0%时,采用再生粗骨料100%替换天然骨料的SFGRC,其立方体和轴心抗压强度、弹性模量、劈裂抗拉和抗折强度分别降低15%、9%、25%、15%和15%,峰值应变增加24%。除了弹性模量外,钢纤维的掺入可显著提高混凝土的各项力学性能,试件破坏呈延性模式;当再生粗骨料替换率为100%时,掺入1.5%钢纤维的SFGRC后,其立方体和轴心抗压强度、峰值应变、劈裂抗拉和抗折强度分别增加15%、9%、10%、65%、39%。根据试验结果并综合考虑再生粗骨料替换率和钢纤维体积掺量的影响,提出了SFGRC基本强度指标的计算公式及换算关系。A total of 240 steel fiber geopolymeric recycled concrete(SFGRC)specimens were prepared,with recycled coarse aggregate replacement ratio(0%—100%)and steel fiber volume fraction(0%—1.5%)as the primary variables,and these specimens were tested for basic mechanical properties and observed for microstructural morphology.The results indicated that replacing natural aggregate with recycled coarse aggregate reduced all fundamental mechanical properties of the concrete.For SFGRC specimen with a 100%recycled aggregate replacement and 1.0%steel fiber content,its cube compressive strength,axial compressive strength,elastic modulus,splitting tensile strength,and flexural strength decreased by 15%,9%,25%,15%,and 15%,respectively,while its peak strain increased by 24%.Except for elastic modulus,incorporating steel fibers significantly improved the mechanical properties of the concrete,and its failure exhibited a ductile mode.When the recycled aggregate replacement ratio reached 100%with 1.5%steel fiber content,the cube and axial compressive strength,peak strain,splitting tensile strength,and flexural strength of the specimen increased by 15%,9%,10%,65%,and 39%,respectively.Based on experimental results,a series of calculation formula and conversion relationship for the fundamental strength indices of SFGRC were proposed,accounting for the effects of recycled aggregate replacement and steel fiber content.

关 键 词：地聚物混凝土 钢纤维 再生粗骨料 力学性能 强度指标 经验公式 

分 类 号：TU528[建筑科学—建筑技术科学]