Abstract
In this study, fly ash, shrinkage reducing agent, polymer powder, and polypropylene fiber were used to develop high performance mortar for concrete repair. Based on experimental test results, the optimum mixing ratio of those components for the high performance mortar was determine...
Abstract
In this study, fly ash, shrinkage reducing agent, polymer powder, and polypropylene fiber were used to develop high performance mortar for concrete repair. Based on experimental test results, the optimum mixing ratio of those components for the high performance mortar was determined.
In order to determine the optimum mixing ratio of the mixtures, mentioned four mixtures; fly ash, shrinkage reducing agent, polymer powder, and polypropylene fiber were mainly classified into three series. For each series, flow test, setting time of hydraulic cement test, compressive strength test, drying shrinkage test, and bond strength test were conducted with target mixing ratio of those components.
In Series I, the effect of the fly ash and shrinkage reducing agent mixtures on the high performance mortar for was investigated with 15 mixing ratios. The 10% portland cement replaced with the fly ash and 1% shrinkage reducing agent added in the high performance mortarfor mixture resulted that the flow, the final setting time, compressive strength, and drying shrinkage were 160 mm, 1,062 mins, 41.19 MPa, and –0.037%, respectively.
In Series II, the effect of the polymer powder was evaluated with 5 mixing ratios. According to the material test results, the 4% portland cement replaced with the polymer powder was determined as the optimum replacement ratio for the high performance mortar. The determined optimum mixing ratio resulted in that the flow, the final setting time, the compressive strength, the drying shrinkage, and the bond strength were 162 mm, 939 mins, 41.90 MPa, -0.027%, and 1.30MPa, respectively.
In Series III, 5 mixing ratios were evaluated with different fibers amounts added in the high performance mortar mixture. Based on the material test results, 0.1% polypropylene fiber amount by volume of cement binder was determined as the optimum mixing ratio. The flow, the final setting time, the compressive strength, the drying shrinkage, the bond strength, and tensile strength were 155 mm, 952 mins, 44.56 MPa, -0.026%, and 1.34MPa, respectively. Moreover, added polypropylene fiber in the high performance mortar mixture resulted in the tensile strength of 1.59 MPa and prevented explosion of the high performance mortar.
In conclusion, the mixing ratio of 10% fly ash, 4% polymer powder, 1% shrinkage reduction, and amount of 0.1% polypropylene fiber is the optimum mixing ratio for the high performance mortar. The high performance mortar mixed with that mentioned ratio shows the sufficient feasibility to be used for the concrete repair.
Abstract
In this study, fly ash, shrinkage reducing agent, polymer powder, and polypropylene fiber were used to develop high performance mortar for concrete repair. Based on experimental test results, the optimum mixing ratio of those components for the high performance mortar was determined.
In order to determine the optimum mixing ratio of the mixtures, mentioned four mixtures; fly ash, shrinkage reducing agent, polymer powder, and polypropylene fiber were mainly classified into three series. For each series, flow test, setting time of hydraulic cement test, compressive strength test, drying shrinkage test, and bond strength test were conducted with target mixing ratio of those components.
In Series I, the effect of the fly ash and shrinkage reducing agent mixtures on the high performance mortar for was investigated with 15 mixing ratios. The 10% portland cement replaced with the fly ash and 1% shrinkage reducing agent added in the high performance mortarfor mixture resulted that the flow, the final setting time, compressive strength, and drying shrinkage were 160 mm, 1,062 mins, 41.19 MPa, and –0.037%, respectively.
In Series II, the effect of the polymer powder was evaluated with 5 mixing ratios. According to the material test results, the 4% portland cement replaced with the polymer powder was determined as the optimum replacement ratio for the high performance mortar. The determined optimum mixing ratio resulted in that the flow, the final setting time, the compressive strength, the drying shrinkage, and the bond strength were 162 mm, 939 mins, 41.90 MPa, -0.027%, and 1.30MPa, respectively.
In Series III, 5 mixing ratios were evaluated with different fibers amounts added in the high performance mortar mixture. Based on the material test results, 0.1% polypropylene fiber amount by volume of cement binder was determined as the optimum mixing ratio. The flow, the final setting time, the compressive strength, the drying shrinkage, the bond strength, and tensile strength were 155 mm, 952 mins, 44.56 MPa, -0.026%, and 1.34MPa, respectively. Moreover, added polypropylene fiber in the high performance mortar mixture resulted in the tensile strength of 1.59 MPa and prevented explosion of the high performance mortar.
In conclusion, the mixing ratio of 10% fly ash, 4% polymer powder, 1% shrinkage reduction, and amount of 0.1% polypropylene fiber is the optimum mixing ratio for the high performance mortar. The high performance mortar mixed with that mentioned ratio shows the sufficient feasibility to be used for the concrete repair.
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