AIR BUBBLE STABILITY MECHANISM OF AIR-ENTRAINING ADMIXTURES AND AIR VOID ANALYSIS OF HARDENED CONCRETE
Monolayer of two kinds of air-entraining agent GYQ and modified rosin R are formed inKSV 2000 Langmuir rain-trough at air-water interface, respectively. The surface pressure ofeach monolayer is measured using the wilhelmy plate technique. The static surface elasticityof monolaycr at air-water interface are discussed by analyzing the n-A isotherm. The air voidcharacteristics of hardened concrete are determined by automated linear traverse method withimage processing system based on ASTM C 457. Its found that the performance of air bubblestability of air-entraining admixtures is determined directly by the strength of monolayer atair-water interface. Comparing with the air void characteristics of hardened concrete producedby air-entraining admixtures, higher strength of GYQ monolayer resulted in the smallerspacing factors and more excellent air void characteristics. Its indicated that durability ofharden concrete produced by GYQ is better than modified rosin R.
Bei Ding Jiaping Liu Jianzhong Liu
Jiangsu Academy of Building Science Co.,Ltd,Nanjing,China
国际会议
南京
英文
1005-1010
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）