碱渣-电石渣激发混凝土的基本力学性能与应力-应变关系  

Basic Mechanical Properties and Stress-Strain Relationship of Soda Residue Calcium Carbide Slag Activated Concrete

作　　者：郭维超 赵庆新[1,2] 邱永祥 石雨轩[2,3] 王帅 GUO Weichao;ZHAO Qingxin;QIU Yongxiang;SHI Yuxuan;WANG Shuai(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066000,Hebei,China;Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Yanshan University,Qinhuangdao 066000,Hebei,China;Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province,Yanshan University,Qinhuangdao 066000,Hebei,China)

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066000 [2]燕山大学城市固废无害化协同处置及利用河北省工程研究中心,河北秦皇岛066000 [3]燕山大学河北省土木工程绿色建造与智能运维重点实验室,河北秦皇岛066000

出　　处：《材料导报》2024年第17期136-143,共8页Materials Reports

基　　金：河北省自然科学基金(E2023203172);国家自然科学基金(52078450);河北省重点研发计划项目(19211505D)。

摘　　要：碱渣、电石渣等碱性工业固废的大面积堆置引发了严重的环境污染问题,亟需拓展资源化利用渠道。本工作以先前开发的碱渣-电石渣协同激发矿渣-粉煤灰胶凝材料替代水泥制备了新型混凝土,研究了其抗压、抗拉、抗折等基本力学性能与单轴受压应力-应变关系。结果表明:新型混凝土的早期抗压强度相比水泥混凝土发展缓慢,可通过适宜的热养护(60~75℃@12 h)进行改善,且对后期强度不会产生不利影响。新型混凝土拉压比和折压比分别为0.102±0.006、0.137±0.007,均高于同等级的水泥混凝土。新型混凝土在单轴受压下具有比水泥混凝土更短的弹性上升段,更长的塑性上升段,峰值应力后延性略差。通过统计回归分别建立了标准抗压、轴心抗压、劈裂抗拉、抗折强度的预测模型以及单轴受压应力-应变关系,均与试验值吻合性较好,为这类新型混凝土的配合比设计、强度预测及工程应用奠定了理论基础。The large-scale stacking of alkaline industrial solid wastes such as soda residue(SR)and calcium carbide slag(CS)has caused serious environmental pollution problems,which is urgent to expand the channels of resource utilization.A new type of concrete(SCB-based concrete,SCBC)was prepared by using the previously developed SR-CS synergistically activated blast furnace slag-fly ash binder(SCB)instead of cement.Its basic mechanical properties such as compression,tensile and flexural properties,and uniaxial compressive constitutive relationship were studied.The results showed that the early compressive strength of SCBC was slower than that of Portland cement concrete(PCC),which could be improved by appropriate heat curing(60-75℃@12 h),and would not have an adverse impact on the later strength.The tension-compression ratio and flexural-compression ratio were 0.102±0.006 and 0.137±0.007,respectively,which were higher than that of PCC with the same grade.SCBC had a shorter elastic rising segment and longer plastic rising segment than PCC under uniaxial compression,and exhibited stronger brittleness after peak stress.The prediction models of standard compressive,axial compressive,split tensile,and flexural strength,as well as the uniaxial compressive stress-strain relationship,were established through statistical regression,which were in good agreement with the experimental values,and laid a theoretical foundation for the mix proportion design,strength prediction and engineering application of SCBC.

关 键 词：碱渣 电石渣 混凝土 力学性能 应力-应变关系 

分 类 号：TU528[建筑科学—建筑技术科学]