水科学与水工程2008，Vol.1Issue(4)：67-74,8.DOI:10.3882/j.issn.1674-2370.2008.04.007
Influence of shrinkage-reducing admixture on drying shrinkage and mechanical properties of high-performance concrete
Influence of shrinkage-reducing admixture on drying shrinkage and mechanical properties of high-performance concrete
Nguyen Quangphu 1Jiang Linhua 2Liu Jiaping 1Tian Qian 3Do Tienquan3
作者信息
- 1. College of Material Science and Engineering, Hohai University, Nanjing 210098, P. R. China
- 2. Faculty of Hydraulic Engineering, Water Resources University, Hanoi, Vietnam
- 3. Jiangsu Institute of Building Science, Nanjing 210008, P. R. China
- 折叠
摘要
Abstract
High-performance concrete (HPC) has specific performance advantages over conventional concrete in strength and durability. HPC mixtures are usually produced with water/binder mass ratios (mw/mB) in the range of 0.2-0.4, so volume changes of concrete as a result of drying, chemical reactions, and temperature change cannot be avoided. For these reasons, shrinkage and cracking are frequent phenomena. It is necessary to add some types of admixture for reduction of shrinkage and cracking of HPC. This study used a shrinkage-reducing admixture (SRA) for that purpose. Concrete was prepared with two different mw/mB(0.22 and 0.40) and four different mass fractions of SRA to binder (w(SRA) = 0%, 1%, 2%, and 4%). The mineral admixtures used for concrete mixes were: 25% fly ash (FA) and 25% slag by mass of binder for the mixture with mw/mB=0.40, and 15% silica fume (SF) and 25% FA for the mixture with mw/ma=0.22. Tests were conducted on 24 prismatic specimens, and shrinkage strains were measured through 120 days of drying. Compressive strength, splitting strength, and static modulus of elasticity were also determined. The results show that the SRA effectively reduces some mechanical properties of HPC. The reductions in compressive strength, splitting tensile strength, and elastic modulus of the concrete were 7%-24%, 9%-19%, and 5%-12%, respectively, after 90 days, compared to concrete mixtures without SRA. SRA can also help reduce drying shrinkage of concrete. The shrinkage strains of HPC with SRA were only as high as 41% of the average free shrinkage of concrete without SRA after 120 days of drying.关键词
high-performance concrete/shrinkage-reducing admixture/compressive strength/elastic modulus/splitting tensile strength/drying shrinkageKey words
high-performance concrete/shrinkage-reducing admixture/compressive strength/elastic modulus/splitting tensile strength/drying shrinkage引用本文复制引用
Nguyen Quangphu,Jiang Linhua,Liu Jiaping,Tian Qian,Do Tienquan..Influence of shrinkage-reducing admixture on drying shrinkage and mechanical properties of high-performance concrete[J].水科学与水工程,2008,1(4):67-74,8.
