نتایج جستجو برای: calcium aluminate cement cac
تعداد نتایج: 195345 فیلتر نتایج به سال:
OBJECTIVE Several studies reported the local tissue reaction caused by mineral aggregate-based cements. However, few studies have investigated the systemic effects promoted by these cements on liver and kidney when directly applied to connective tissue. The purpose of this in vivo study was to investigate the systemic effect of mineral aggregate-based cements on the livers and kidneys of rats. ...
During the hydration of cement, tricalcium aluminate (C3A) reacts with gypsum and forms ettringite (AFt). Once all gypsum is consumed, ettringite can further react with remaining C3A and form monosulfate (AFm) at 1–2 days. Normally, at early ages, ettringite all transfers to AFm phase. After several months or years, ettringite can form again if a new source of sulfate becomes available in the p...
OBJECTIVE The goal of this study was to compare and contrast coronary artery calcium (CAC) with abdominal aortic calcium (AAC) in terms of their associations with traditional and novel cardiovascular disease (CVD) risk factors. METHODS AND RESULTS We measured both AAC and CAC using computed tomography scans in 1974 men and women aged 45 to 84 years from a multiethnic cohort. Traditional and n...
In this research, mineralogy, geochemistry and SEM micrographs of clinker and Portland cement of Orumiyeh Cement factory were studied by Clinkers Polished sections and SEM micrographs as well as chemical analysis of clinker and Portland cements were done by XRF method in the Orumiyeh cement factory chemical lab and bogue chemical indices were calculated. Also, lime saturation factor, silica and...
In this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (CH45) produced by the Algerian firm REFRACTAL.The investigated properties are setting time, water consumption, electrical conductivity, pH, density and the compressive strength. The results show a setting time of about 200 min for the acid...
in this study, slag penetration into a magnesia refractory monolithic was investigated by the crucible test method. a synthetic calcium aluminate slag system has been used to study commercial magnesia mix refractory for 1, 2, 3, 4, 5 and 6 hours at 1450°c and 1600°c. it has been shown that the penetration rate is controlled by a diffusion mechanism at 1450°c. in this case, capillaries are the ...
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