EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER NORMAL TEMPERATURE CURING
-
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.
-
LARRARD F D, SEDRAN T. Optimization of Ultra-High-Performance Concrete by the Use of a Packing Model[J]. Cement and Concrete Research, 1994, 24(6):997-1009. 陈宝春,韦建刚,苏家战,等.超高性能混凝土应用进展[J].建筑科学与工程学报,2019,36(2):10-20. WILLE K, NAAMAN A E,PARRA-MONTESINOS G J. Ultra-High Performance Concrete with Compressive Strength Exceeding 150 MPa (22 ksi):A Simpler Way[J]. ACI Materials Journal,2011,108(1):34-46. ZHAO S J, FAN J J, SUN W. Utilization of Iron Ore Tailings as Fine Aggregate in Ultra-High Performance Concrete[J]. Construction and Building Materials,2014,50:540-548. 刘斯凤,孙伟,林玮,等.掺天然超细混合材高性能混凝土的制备及其耐久性研究[J].硅酸盐学报,2003(11):1080-1085. 佘伟,张云升,张文华,等.较好韧性的超高强混凝土的制备及性能[J].建筑材料学报,2010,13(3):310-314. 周红梅,朱万旭,陈钰烨,等.超高性能混凝土(UHPC)试验及应用研究[J].预应力技术,2009(6):26-29,35. 陈宝春,季韬,黄卿维,等.超高性能混凝土研究综述[J].建筑科学与工程学报,2014,31(3):1-24. 中华人民共和国国家质量监督检验检疫总局.通用硅酸盐水泥:GB 175-2007[S].北京:中国标准出版社,2007. 王德辉,史才军,吴林妹.超高性能混凝土在中国的研究和应用[J].硅酸盐通报,2016,35(1):141-149. 石林泽,徐晨翱,丁勇,等.自然养护下UHPC制备方式与抗压强度分析[J].工程建设与设计,2018(3):229-232. 中华人民共和国住房和城乡建设部.活性粉末混凝土:GB/T 31387-2015[S].北京:中国标准出版社,2015. 中华人民共和国建设部.普通混凝土力学性能试验方法标准:GB/T 50081-2019[S].北京:中国建筑工业出版社,2003. YAMADA K, TAKAHASHI T, HANEHARA S, et al. Effects of the Chemical Structure on the Properties of Polycarboxylate-Type Superplasticizer[J]. Cem Concr Res, 2000, 30(2):197. WINNEFELD F, BECKER S, PAKUSCH J, et al. Effects of the Molecular Architecture of Comb-Shaped Superplasticizers on Their Performance in Cementitious Systems[J].Cem Conce Compos, 2007, 29(4):251-262. 隋同波,王晶.混凝土高效减水剂作用机理新进展[J].中国建材科技,1998(4):10-13. 王国建,魏敬亮.混凝土高效减水剂及其作用机理研究进展[J].建筑材料学报,2004,7(2):188-193. 王子明.聚羧酸系高性能减水剂的制备、性能与应用[M].北京:中国建筑工业出版社,2009. 梁咏宁,陈宝春,季韬,等.砂胶比、水胶比和钢纤维掺量对RPC性能的影响[J].福州大学学报(自然科学版),2011,39(5):748-753. 鞠彦忠,王德弘,康孟新.不同钢纤维掺量活性粉末混凝土力学性能的试验研究[J].应用基础与工程科学学报,2013,21(2):299-306. 马恺泽,刘亮,刘超,等.高强混合钢纤维混凝土的力学性能[J].建筑材料学报,2017,20(2):261-265. 阎培渝,崔强.养护制度对高强混凝土强度发展规律的影响[J].硅酸盐学报,2015,43(2):133-137.
点击查看大图
计量
- 文章访问数: 129
- HTML全文浏览量: 6
- PDF下载量: 2
- 被引次数: 0