Influence of Admixtures on Properties of Traditional Sticky Rice-lime Mortar and Their Mechanisms |
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Authors: | WEI Guo-feng ZHANG Bing-jian FANG Shi-qiang |
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Affiliation: | Department of Cultural Relics and Museology;Department of Chemistry, Zhejiang University, Hangzhou 310027, P.R.China;Department of Cultural Relics and Museology;Department of Chemistry, Zhejiang University, Hangzhou 310027, P.R.China;School of chemical engineering and materials, Zhejiang University of Technology, Hangzhou 310014, P.R.China |
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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. |
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Keywords: | sticky rice-lime mortar paper fiber aluminum sulfate gypsum |
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