1 School of Civil Engineering, Central South University, Changsha 410075, China 2 Nanjing Lishui Overseas Chinese Town Industrial Co., Ltd., Nanjing 210046, China
Abstract: The effects of mixing speed and mixing time on the homogeneity, air content, rheological properties and early strength of high dosage SBR latex modified sulphoaluminate cement (SAC) mortar were studied. The hydration degree and pore characteristics of hardened mortar were investigated by TGA and BET tests. The results show that the homogeneity and mechanical strength of mortar can be improved by prolonging the mixing time and increasing the mixing speed. However, when the mixing speed is up to 176 r/min, increasing the mixing time will increase the air content of fresh mortar, and lead to the improvement of the porosity of hardened mortar. Prolonging the mixing time and increasing the mixing speed hinder the flocculation of mortar and destroy the bridging of particles, significantly reducing the structural build-up rate. Prolonging the mixing time reduces the yield stress and plastic viscosity of mortar. Optimizing the mixing technique is helpful to provide important parameters for the formulation of mixing specifications for filling layer repair mortar.
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2024, Vol. 38 
