Topic
Calcium aluminates
About: Calcium aluminates is a research topic. Over the lifetime, 490 publications have been published within this topic receiving 9200 citations.
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TL;DR: In this paper, a new building material composed of clay and dolomite at the variable mass ratio C D = 1/9−9/1 is developed, which is composed of both the old structure of carbonates and new formations such as calcium silicates, calcium aluminates and MgO in fine crystalline or amorphous state.
Abstract: New building material composed of clay and dolomite at the variable mass ratio C D = 1/9−9/1 is developed. At the firing temperature of 720 °C the interaction between the components takes place resulting in the formation of structure which ensures high mechanical strength of the material obtained. The structure is composed of both the ‘old’ structure of carbonates and new formations such as calcium silicates, calcium aluminates and MgO in fine crystalline or amorphous state permeating through the ‘old’ structure. The mechanical strength of the fired material subjected to hydraulic hardening with following drying increases per 200–300%.
01 Jan 2014
TL;DR: In this article, the effect of polycarboxylate ether (PCE) based superplasticiser-plasticizer on the fresh and hardened properties of mortars based on commercial CACs was investigated.
Abstract: SUMMARY: This work investigates the effect of polycarboxylate ether (PCE) based superplasticiserplasticiser onto the fresh and hardened properties of mortars based on commercial CACs. Mortar specimens were prepared aiming at constant workability; PCE addition was varied as 0%; 0.3%; 0.6% and 0.9% of cement mass. The required water to cement ratio to maintain the workability of fresh mortar was recorded. Cohesion of the fresh mortar was improved by addition of methyl-cellulose, thus avoiding segregation induced by the superplasticiser action. As PCE significantly retard the setting time, Li2CO3 was investigated as an accelerator. Compressive and flexural strengths were tested after 1 day and 9 days cured at 23°C and after transformation of metastable hydration products at 60°C. Deleterious effect of transformation of metastable hydration products to stable ones on mechanical properties was successfully reduced by lowering of water to cement ratio while maintaining the workability. In conclusion, the usage of PCE showed promising superplasticizing properties for CAC based materials.
20 Feb 2015
TL;DR: In this paper, the microinclusions were mainly Al2O3 and sulfide inclusions from tapping to the beginning of LF refining, which caused the defects of beam plates.
Abstract: The results showed the microinclusions were mainly Al2O3 and sulfide inclusions from tapping to the beginning of LF refining. Al2O3 inclusions were modificated into calcium aluminates after calcium treatment. Lots of spherical calcium aluminates composite inclusions containing MgO, TiO2 and MnS were found after soft blowing and during tundish metallurgy and left in the slab which caused the defects of beam plates. Pure Al2O3 inclusions were observed again after soft blowing 8min. Average sulfur content in inclusions decreased because of the high desulfurization ability of refining slag. Average Ca/Al ratio value in inclusions increased during LF refinging because of the reduction of CaO in slag by carbon and it increased obviously during the process of soft blowing 8min because of the dissolusion of calcium wire.
TL;DR: The calcium aluminates hydration in water and Na 2 CO 3 solutions have been studied using the microcalorimetry, DTA, TG and XRD methods.