Effects Of Silicate Cement And Calcium Sulfoaluminate Cement On The Proprieties Of Foam Concrete

Foam concrete is classified as lightweight concrete consisting of foam,cement,water and aggregates.In general,Silicate Cement is the most commonly used cementitious material in the production of Foam Concrete.According to reports,Calcium Sulfoaluminate(CSA)cement has been used for the preparation of foam concrete due to its fast setting,hardening speed,and high early strength.However,much of the current technological implementations rely mainly on the benefits of CSA cement for ultra-low-density foam concrete.There are,however,few papers on the scientific study and experimental research of these cementitious materials in the low and medium density of foam concrete.On this basis,the fresh,mechanical,physical and durability properties of a new foam concrete were tested using Silicate cement with partial and complete replacement by CSA cement.The experiment was planned with a Silicate-CSA Cement Ratio of 5/0,4/1,3/2,2/3,1/4 and 0/5.The dry density target and the water-cement ratio were set at600 kg/m~3 and 0.55,respectively.Related experiments were performed based on the indexes of fluidity,3d,7d,and28d compressive strength,28d splitting tensile strength,elastic modulus,dry density,hygroscopicity,and water absorption.With the results of the laboratory test,mathematical models were proposed to characterize the relationship between the Silicate-CSA cement Ratio and the properties of foam concrete,and an algorithm was developed that classifies the foam properties of each Silicate-CSA cement ratio with a rating system that can prescribe a mixed ratio based on the intended application on anticipated preferred proprieties.The test results of the fresh properties,measured by the fluidity of the fresh slurry,revealed that the concentration of CSA cement impacted the fluidity,and it reduced the most from an initial 187 mm to 173 mm at the Silicate-CSA cement ratio of 1/4.As for the compressive strength,the splitting tensile strength and the elastic module,the peak strength is concentrated mainly in the Silicate-CSA cement ratios of 3/2～2/3.As far as physical property is concerned,the dry density was mainly distributed around the designed value(600 kg/m~3).The durability properties like hygroscopicity and water absorption were found that the Silicate-CSA cement ratio were lower in the 3/2 and 2/3ranges than those in other mixed proportions.In the correlation and linear regression study of the independent variable(Silicate-CSA cement ratio)and dependent variables(properties of foam concrete)based on the interpretation of the Pearson correlation coefficient(R),the highest correlation of all models was observed at 3d compressive strength with R=0.91.Besides,with a confidence interval of 95%and taking into account the F test result and the P-value for3d compressive strength,the statistical significance of the regression model was observed with a correlation coefficient(R~2)and a modified correlation coefficient(R_a~2)of 0.822 and 0.774,respectively.For preferred properties of low water absorption,hygroscopicity and high strength aiming at possible structural application and based on both experimental results and modeling analysis,the range of silicate cement between 3.03 to 2.53 and CSA cement range between 1.97 to 2.47 are recommended with 3%variability in above mentioned properties,which suggests the recommendation of a design with Silicate-CSA cement ratio at 3.03/1.97 and 2.53/2.47.An article with the novel results of this experimental study has been submitted to the Journal of Central South University with the title:“Effects of Silicate Cement and Calcium Sulfoaluminate Cement on the proprieties of foam concrete.”...