Title: Properties of Reducing Drying Shrinkage by Using Shrinkage Reducing Agent
Abstract:This paper presents the characteristics of drying shrinkage of the cement mortar using a shrinkage reducing agent and a expanding agent. The unrestricted and restrained drying shrinkage strain, the ra...This paper presents the characteristics of drying shrinkage of the cement mortar using a shrinkage reducing agent and a expanding agent. The unrestricted and restrained drying shrinkage strain, the rate of weight loss and strength of the mortar are measured according to age, and also the surface tension measured by changing the consistency of aqueous solution. The experimental results show that the shrinkage reducing agent reduce surface tension considerably and increase the rate of weight loss according to drying of hardened cement mortar. The mechanism of reducing drying shrinkage is assumed to be tile weakening function of surface tension of capillary water in hardened cement mortar. In a experiment for unrestricted drying shrinkage strain, the use of 1.5% of shrinkage reducing agent can reduce the shrinkage reducing rate up to 30% without loss of strength. In restrained drying shrinkage strain test according to JIS, the use of 1.5% of shrinkage reducing agent is effective on the control of 20% of the restrained tension strain rate and the use of 0.45% of expansion agent is effective on the control of 50% of that. In the restrained strain test, the admixtures of shrinkage reducing agent and expanding agent are effective in the prevention of crack as shrinkage reducing effect by shrinkage reducing agent are rised according to the expanding effect by expanding agent.Read More
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 1
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot