【摘 要】
：
Magnesium phosphate based cements are rapid setting have high early strength.To prolong the setting time,retarding additives are often used in magnesium phosphate cements.In the present paper, the mag
【机 构】
：
School of Civil Engineering, Shenzhen University;Guangdong Province Key Laboratory of Durability for
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Magnesium phosphate based cements are rapid setting have high early strength.To prolong the setting time,retarding additives are often used in magnesium phosphate cements.In the present paper, the magnesium phosphate cement (MPC) consists of magnesia, potassium phosphate and fly ash with different retarders were investigated.Effect of different additives, sodium tripolyphosphate (ST), borax (NB) and boric acid (BA) on the early hydration and properties of MPC were examined, including the setting time, temperature rise during initial hydration, strength and electrical conductivity development.Hydration products of MPC paste were analyzed by X-ray diffraction (XRD), and the morphology of early hydrates was observed by scanning electron microscopy (SEM).
其他文献
Usage of alternate materials becomes a focused agenda towards sustainability initiatives, more so, for the depleting stock of non-renewable resources.Material characteristics have perpetually been cha
This paper reports on the microstructure observations of certain calcium aluminate cement (CAC) based binder systems in concrete mixtures that were subjected to microbially-induced (biogenic) sulphuri
Many studies have shown that the formation of geopolymers proceeds according to a mechanism of dissolution-restructuring-polymerization resulting in a solid material.Nevertheless, texturing of the mat
Cracks were observed when the magnesium silicate hydrate gel cement (prepared by 40% MgO/60% silica fume) was dried.This drying cracking is believed to be caused when unbound water evaporates from the
This paper reports on a comparative study of the mechanical performance at high temperatures of a commercial Portland cement (CEM I 42.5 (OPC)), a hybrid cement (CEM HYC =30% clinker + 32.5 % BFS + 32
Calcium aluminate cement (CAC) is a specialty cement with distinct advantages over ordinary portland cement (OPC).It has been successfully used in many fields for more than 100 years.However, one prim
Yeehmite is one ot the major constituents of Calcium SulphoAluminate type cements (CSA) and almost entirely responsible for the hydraulic reactivity at early age.It is well known that yeelimite can fo
The present study focus on the effect of curing temperature on the hydration of calcium aluminate cement (CAC) dominated ternary binders at 0, 10, 20 and 40℃.Two varieties of calcium sulfate are emplo
This work presents a comparative study of the hydration and carbonation reactions of three calcium silicate phases.Triclinic tricalcium silicate and γ-dicalcium silicate were synthesized in laboratory
Calcium sulfoaluminate (CSA) cements have been shown to have lower carbon footprint than that of Portland cement.In addition, the expansive nature of CSA-based cement can be utilized to enhance the re