| 摘要: |
| 采用高强页岩陶粒、微细钢纤维和矿物掺和料制备微细钢纤维高强轻骨料混凝土（MSFHLAC）试件,研究了微细钢纤维体积分数、砂率和水灰比对MSFHLAC试件立方体抗压强度、劈裂抗拉强度、弯折强度、抗剪强度和弯曲韧性等静态力学性能的影响,同时给出了MSFHLAC试件的各强度模型以及相互关系.结果表明：新拌混凝土的工作性能随着微细钢纤维体积分数的增加而降低,当微细钢纤维体积分数大于15%时,对新拌混凝土的流动性影响明显;微细钢纤维可以显著改善高强轻骨料混凝土（HLAC）的各项强度和韧性指标,且在低纤维体积分数（05%和10%）时,材料的抗拉强度和抗剪切强度增长尤为显著;MSFHLAC试件在整个弯曲变形阶段弹塑性较好,较接近理想弹塑性材料;砂率和水灰比对MSFHLAC试件的各项强度和韧性虽有一定影响,但变化幅度基本在10%以内. |
| 关键词: 轻骨料混凝土 微细钢纤维 力学性能 弯曲韧性 强度公式 |
| DOI：103969/j.issn.1007 9629202004031 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51978060） |
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| Static Test of Micro Steel Fiber High Strength Lightweight Aggregate Concrete |
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YE Yanxia1, WANG Zongbin1, PENG Qiongwu1, ZHANG Zhiyin2, LIU Jilei1
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1.School of Civil Engineering, Changan University, Xian 710061, China;2.Xian Benchmark Fangzhong Architectural Design Co., Ltd., Xian 710061, China
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| Abstract: |
| The static mechanical properties of micro steel fiber high strength lightweight ceramsite aggregate concrete（MSFHLAC） with different steel fiber volume fractions, sand ratio and water cement ratio were investigated. The test mainly includes cubic compressive strength, splitting tensile strength, flexural strength, shear strength and bending toughness, etc. In addition, various strength models and mutual relations of MSFHLAC were given.The workability of freshly mixed concrete was shown to reduce with the increase of micro steel fiber volume fraction. When the fiber volume fraction is greater than 15%, its fluidity is obviously affected. Micro steel fiber can significantly improve all strength and toughness indexes of HLAC. The tensile and shear strength of materials are improved particularly obviously at low fiber volume fraction(05%,10%).The MSFHLAC has a better elastoplasticity in the whole bending deformation stage, it is close to the ideal elastoplastic materials. The sand ratio and water cement ratio have some influence on the strength and toughness of MSFHLAC,but the variation range is within 10%. |
| Key words: lightweight aggregate concrete(LWAC) micro steel fiber mechanical property flexural toughness strength formula |
