Durability of High Water-Cement Ratio Concrete

• Main Authors: Pai, Chia-Ching, 白佳璟
• Other Authors: Jau, Wen-Chen
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/43849523090407791104

碩士 === 國立交通大學 === 土木工程研究所 === 86 === 　　The research takes ACI code, design to three different high water-cement ratio concrete (W/C=0.75, 0.90, 1.15) .We add fly-ash and slag to replace 20percent cement. Treat them in air curing and dry-wet cycle acceleration to find their different after 28 days water curing. This research uses mechanical test, chemical method and D.C to understand the influence of Pozzolans for high water-cement ratio concrete. 　　The research result points out that add Pozzolans the compressive strength, dynamic modulus of elasticity, and modulus of rupture will be higher in the later period. Besides the dynamic modulus of elasticity in the dry-wet cycle will be higher than in the air curing. The experiment in the content of Cl- points out that the content of Cl- decrease in air curing as time increase, but in dry-wet cycle acceleration becrease the seawater permeate, the content of Cl- increase as time increase. When the W/C lower the content of Cl- lower. The experiment of Potential and the Resistence points out that yhe steel will be not corrsive in air curing, but the steel have corrsived in dry-wet cycle acceleration and will be as heavy as time increase. Add Pozzolans in dry-wet cycle the Potential and Resistence will be higher than that not add Pozzolans, and can provide a good protective environment for steel.