EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER NORMAL TEMPERATURE CURING
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摘要: 在桥梁工程中,免蒸养超高性能混凝土(UHPC)较传统蒸养UHPC具有广阔的工程应用前景。基于常规材料制备免蒸养UHPC,通过改进传统制备工序,改善UHPC基本性能,开展立方体抗压、轴心抗压、抗折、弹性模量等基本力学性能试验,分析减水剂类型、钢纤维体积掺量对免蒸养UHPC力学性能的影响,对比不同养护条件下力学性能的差异。试验结果表明:聚羧酸减水剂的增强效果优于萘系减水剂;钢纤维体积掺量在2%范围内,随着掺量的增加,UHPC强度明显提高;自然养护下,UHPC除抗折强度外,其他力学性能均接近于标准养护下UHPC力学性能,各性能指标均符合工程要求。Abstract: Compared with the traditional steam curing technique of ultra-high performance concrete (UHPC), the UHPC under natural curing technique is of lower energy consumption and boarder application prospects in bridge engineering. Based on the compression test of concrete cubes, axial compression test, flexural test, elastic modulus measuring, and et al, To increase the mechanical properties of UHPC, the traditional production process was improved with conventional materials in the normal temperature curing. The effects of types of water reducers, volume fractions of steel fiber and curing condition on the mechanical characteristics of UHPC were examized. The results showed that the polycarboxylate superplasticizers could improve the compressive strength of UHPC specimens with the same volume fractions of steel fiber better than the naphthalene water reducers. The compressive strength and flexural tensile strength of UHPC specimens were significantly increased with the increase of steel fiber volume fractions within of 2%, and the other mechanical properties of UHPC specimens except the flexural tensile strength, were close to that of the UHPC specimens in the standard curing state.
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