The development for Self-Curing Concrete of mechanical properties and shrinkage

• Main Authors: Xu, Da-Ru, 徐大儒
• Other Authors: Jau, Wen-Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/12708358005223359764

碩士 === 國立交通大學 === 土木工程系所 === 104 === The purpose of curing is to prevent excessive evaporation of water from the concrete to achieve full hydration to improve quality of the concrete. With today’s environmental consciousness of human being, the progress of material technology and economic needs, the use of mineral admixtures often replace part of cement, but pozzolanic reaction of mineral admixture is later than the hydration reaction of cement. This makes curing more important to guarantee the effectiveness of pozzolans. This study test different new blended Self-Curing admixtures proportions (SCA) to achieve better conservation and energy-saving way that based on water retention of SCA. The experiment was divided into two parts. The first part was to test weight change of new SCA with past SCA and mixed with each other in different proportions and environments. The second part was to use the better optimum SCA separated added 1% into traditional concrete and self-compacting concrete (SCC) in order to test the workability, mechanical properties, volume stability and durability. Observing the relationship between standard curing and the way of curing, compare with each other and sort out each variables, then we can make regression analysis. The admixtures results show that the ratio seven of SCA is the best optimum, then we take 1% of it to make curing concrete specimens. The 14 day wet curing specimens with SCA are very close or even better than standard curing without SCA in mechanical properties and durability. The 7 day strength with SCA can be up to 80% then the design strength, and the specimens with SCA at 90 days, the ability for rapid chloride permeability test (RCPT) are very close or even better than the specimens without SCA. These two proportions can just take 14 days through wet curing with SCA can reach the effect of standard curing without SCA.