Influence of Admixtures on Properties of Traditional Sticky Rice-lime Mortar and Their Mechanisms
WEI Guo-feng,ZHANG Bing-jian and FANG Shi-qiang
DOI:10.11835/j.issn.1674-4764.2011.05.024
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2011,Pages 143-149
- Abstract
On the basis of characterization of property of traditional sticky rice-lime mortar, influence of admixtures (aluminum sulfate, gypsum, paper fiber) on properties of traditional sticky rice-lime mortar and their scientific mechanisms are discussed by means of SEM and XRD. It is indicated that paper fiber is the most effective admixture to endure freezing-thawing cycles and increase compressive strength of sticky rice-lime mortar due to disorderly distribution and water-retaining of paper fiber, and the use of aluminum sulfate reduces dry shrinkage values and improves compressive strength because of formation of ettringite in sticky rice-lime mortar. Gypsum is proved to be ineffective to modify freezing-thawing cycles of sticky rice-lime mortar. Meanwhile, compressive strength and surface hardness of sticky rice-lime mortar with gypsum decline as gypsum amounts. It is suggested that 6% aluminum sulfate or 3% paper fiber can be used as admixtures of sticky rice-lime mortar in conservation of cultural relics.