Research on manufacturing dry mixed cement mortar with high compressive strength, high flexural strength, low shrinkage and high watertightness for restoration of damaged hydraulic structures in Vietnam

That is suitable for the restoration of concrete structures in general and hydraulic structures in particular of Vietnam. The dry mixed mortar is manufactured and in bag of 15± kg weight. Keywords: dry mixed cement mortar, compressive strength, shrinkage, flexural strength, adhesion, watertightness, high range water reducing admixture (HRWR), polymer acrylic. | Vietnam Journal of Mechanics , VAST , , (2008), pp. 99 - 111 RESEARCH ON MANUFACTURING DRY MIXED CEMENT MORTAR WITH HIGH COMPRESSIVE STRENGTH, HIGH FLEXURAL STRENGTH, LOW SHRINKAGE AND HIGH WATERTIGHTNESS FOR RESTORATION OF DAMAGED HYDRAULIC STRUCTURES IN VIETNAM Nguyen Quang Phu 1 12 , Hoang Pho Uyen 3 , Jiang Lin Hua 1 , Liu Jiaping 4 1 College of Materials Science and Engineering, Hohai Unive rsity, Nanjing, . China (210098) 2 Faculty of Hydraulic Engineering of Water Resources University, Vietnam 3 Research of Building Material Science Department, Institute of Water Resources Research, Vi etnam 4 Jiangsu Research Institute of Building Science, Nanjing 210008, China . Abstract. Usi ng normal materials to manufacture the mixed mortar is necessary for restoration of hydraulic structures in Vietna m . It will salvage the materials and decreases the cost price of the mortar. In this research, we used cement m ade in Vietnam (Chinfon - Haiphong cement), na tural sand (Lo River sand), polymer acrylic and high range water reducing (of SIKA company)' with proportion 1 : 3 : : by weight. The water to cement ratio is , which always ensure t he compressive strength of mortar more t han 40 MPa and small shrinkage, good watertightness, and high adhesion. That is suitable for the restoration of concrete structures in general and hydraulic structures in particular of Vietnam. The dry mixed mortar is manufactured and in bag of 15± kg weight. Keywords: dry mixed cement mortar , compressive strength , shrinkage, flexural strength , adhesion , watertightness , high range water reducing admixt ure (HRWR), polymer acrylic. 1. INTRODUCTION After fifty years, many hydraulic structures in Vietnam were damaged and downgraded that why it is necessary to repair them for continuing operated. Here the most important hydraulic structures are made of concrete and reinforced concrete, that when repairing has required the same m aterials having the same .

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