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Performance and mechanism analysis of aluminum sulfate based low alkali accelerator cement paste

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Document pages: 10 pages

Abstract: A low alkali liquid solidification accelerator hlsa was proposed; This is an environmentally friendly product. In order to study the temperature adaptability and cement flexibility of hlsa, the setting time and strength development characteristics of cement containing hlsa are discussed in this paper. The effects of hlsa on hydration process, hydration products and microstructure were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and mercury injection (MIP). The results show that the four typical 42.5 ordinary portland cement types with hlsa content of 6 – 8 can meet the class I requirements specified in jc477-2005 even at low temperature (e.g. 10 ° C). In addition, the percentage is 28   d compressive strengthof cement with 6–8 HLSA was over 90 ; the XRD diffraction peak of AFt integrated area of cement with 7 HLSA was 3818 at 5 min of hydration; SEM observation revealed that AFt crystals were filled in the pore of cement at 28 d of hydration; the temperature adaptation and cement flexibilities of HLSA were excellent; the cement with HLSA coagulating in a short time attributed to promoting the formation of abundant AFt and the hydration of C3S.

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