免蒸养超高性能混凝土力学性能的试验  

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER NORMAL TEMPERATURE CURING

作　　者：吴琛[1] 陈柯丹 林上顺 丁峰 李道松 WU Chen;CHEN Kedan;LIN Shangshun;DING Feng;LI Daosong(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350118,China;Research Institute of Geotechnical Engineering,Fujian University of Technology,Fuzhou 350118,China;Communications Construction Cost Office of Fujian Province,Fuzhou 350001,China)

机构地区：[1]福建工程学院福建省土木工程新技术与信息化重点实验室,福州350118 [2]福建工大岩土工程研究所有限公司,福州350118 [3]福建省交通工程造价站,福州350001

出　　处：《工业建筑》2021年第1期140-145,共6页Industrial Construction

基　　金：福建省高校产学合作项目(2019Y4011);福建省新世纪优秀人才支持计划项目(GYZ-160144);福建省自然科学基金项目(2020J01233308)。

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。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.

关 键 词：超高性能混凝土 免蒸养 力学性能试验 减水剂 钢纤维体积掺量 

分 类 号：TU528[建筑科学—建筑技术科学]