MICROSTRUCTURE DEVELOPMENT DURING EARLY PORTLAND CEMENT HYDRATION
Two main properties of concrete are most important on the construction site: the settingtime and the hardening time. The setting determines the workability and casting period of themixture. The hardening is responsible for the strength developments and controls thenecessary time point to demould concrete. In this study five different Portland cements were examined by using ultrasonic wavepropagation techniques and thermal calorimetry measurements. The aim is to find a betterunderstanding of the early hydration kinetics to enhance the forming material properties ofconcrete. The focus is put on the chemical and physical factors of the early hydrationmechanism. Ultrasonic pulse velocity offers a possibility to follow in situ and non destructivethe developments of the microstructure. Isothermal conduction calorimetry determines theoverall chemical reactivity. With the help of these methods the end of the dormant periodcould be clearly defined and the diversity of the acceleration processes were documented ofthe single Portland cements.
S.Brendle M.R.De Rooij
Microlab,Materials & Environment,Delft University of Technology,The Netherlands
国际会议
南京
英文
189-197
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）