首页|珊瑚骨料种类和混杂纤维对珊瑚混凝土强度与断裂性能的影响

珊瑚骨料种类和混杂纤维对珊瑚混凝土强度与断裂性能的影响

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海水珊瑚骨料混凝土(SCAC)由珊瑚礁砂石、海水等海洋地域性原材料与胶凝材料混合制备而成，在海洋国家的国防和基础设施建设中展现出缩短工期、降低成本、减少能源消耗的优势。但SCAC 性脆易裂，珊瑚骨料的制约作用随着混凝土强度等级的提高而更加显著。本文探究了两种不同类型的珊瑚骨料对SCAC性能的影响，并将柔性的聚乙烯醇(PVA)纤维和刚性的钢纤维混杂，以期提升SCAC的强度、韧性与断裂性能。结果表明，含低强珊瑚骨料的SCAC抗压强度比含高强珊瑚骨料的SCAC抗压强度降低了30。8%(从55。6降至38。5 MPa)，掺入纤维可以在一定程度上缓解骨料自身缺陷对SCAC强度的影响。此外，提出了一种新的本构模型来描述SCAC的应力-变形关系，模型预测结果与试验数据吻合较好。相比于不掺纤维的对照组，掺入0。1%、0。2%和0。3%PVA纤维的SCAC的断裂能分别提高了10%、49%和88%。在纤维用量相同时，混杂纤维组的断裂能比单掺纤维组高46%。
Strength and fracture properties of coral concrete under impact of coral aggregate type and fiber hybridization
Seawater coral aggregate concrete(SCAC)has demonstrated advantages in reducing material cost and energy consumption of marine infrastructure on reefs and islands.However,SCAC exhibits increased brittleness and higher dependency on coral aggregate type as its strength increases.In this study,two types of coral aggregates are used to compare their influence on SCAC performance.Flexible fiber and rigid fiber are blended to improve the strength,toughness,and fracture properties of SCAC.The results show that the compressive strength of SCAC incorporating low-strength coral aggregate is reduced by 30.8%when comparing to that containing high-strength coral aggregate(from 55.6 to 38.5 MPa).Fiber incorporation could mitigate the strength reduction that originated from weaker coral aggregates.A novel constitutive model is proposed to describe the stress-deformation curves of SCAC.Good agreement between the model prediction and test data is observed.Relative to reference group,the fracture energies of SCAC adding 0.1%,0.2%,and 0.3%polyvinyl alcohol fibers are increased by 10%,49%,and 88%respectively.The fracture energies of hybrid fiber groups are 46%higher than that of mono fiber groups with the same fiber dosage.

seawater coral aggregate concretehybrid fibercoral aggregatestrengthstress-strain curvefracture properties

王振波、刘伟康、左建平、韩宇栋、李鹏飞、郝如升

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School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China

State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology(Beijing),Beijing 100083,China

Central Research Institute of Building and Construction,MCC Group Co.,Ltd.,Beijing 100088,China

海水珊瑚骨料混凝土 混杂纤维 珊瑚骨料 强度 应力-应变曲线 断裂性能

国家自然科学基金国家自然科学基金Joint Fund of State Key Laboratory of Coal Resources and Safe Miningthe Beijing Outstanding Young Scientist Program,China中央高校基本科研业务费专项

5222540451808545SKLCRSM21LH042023ZKPYLJ05

2024

10.1007/s11771-024-5654-z

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(5)
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