【摘 要】
：
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
【机 构】
：
School of Materials Science and Engineering, Tongji University, Cao'an 4800, JiadingDistrict, Shang
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
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 employed, including α-hemihydrate and natural anhydrite.The effects of temperature on the phase development, together with microstructure change of pastes within 3 days were systematically determined by X-ray diffraction (XRD),backscattered electron imaging (BEI) and mercury intrusion porosimeter (MIP).Results show that higher temperature accelerates the 1-day strength prominently, while it has no obvious contribution to the later age strength.Furthermore, though the main hydration products are relating to calcium (sulpho)aluminate related phases, raising temperature leads to a rapider conversion from ettringite to plate-like monosulfate, and higher amount of coarser pores for pastes with anhydrite after 3 days, but finer pores for those pastes with α-hemihydrate.Additionally, stratlingite (C2ASH8) and aluminium hydroxide also form at 40℃ in those pastes with anhydrite compared with binders containing α-hemihydrate.
其他文献
Steel slags contain high calcium and silica content and are reactive with carbon dioxide.This characteristics can be utilized to develop strength.On the other hand, production of ordinary Portland cem
Effect of a new chemical additive on the hydration and strength development of phosphogypsum slag cement is studied.Compressive strength, porosity, and the hydration products are identified.The result
At present, the cement industry produces about 5% of the global anthropogenic CO2 emissions.Thus a decrease in the CaO content of cement provides one important opportunity to reduce CO2 emissions.Lowe
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