نتایج جستجو برای: calcium aluminate cement cac
تعداد نتایج: 195345 فیلتر نتایج به سال:
Abstract With the ever-expanding presence of solar energy, design cost-efficient heat energy storage systems is becoming increasingly relevant. Concrete a potential solid material for these but raises questions its response at high temperatures in operating conditions. This work studies concrete designed with calcium aluminate cement and three types aggregates that are stable temperatures. The ...
BACKGROUND To examine the association between the American Heart Association's 7 metrics of ideal cardiovascular health (ICH) and the presence of subclinical coronary atherosclerosis as assessed by coronary artery calcification (CAC) using electron-beam computed tomography. METHODS AND RESULTS This study is a cross-sectional analysis of data obtained on 3121 male and female patients evaluated...
Portland cement could be produced by heating the raw materials (clay, limestone) about 1500°C which clinker will be formed. Geochemical and mineralogical studies of clinker, Portland cement, cement kiln dust and cement mill dust have been carried out by optical microscopy, X-ray diffraction and X-ray florescence. In phase system diagram (CaO-Al2O3-SiO2), chemical components of clinker cement oc...
Concretes mixed with seawater are characterised by enhanced performances, but action of chlorides and sulfates ensures the risk reinforcement corrosion. Application high consistency fresh concretes changes in hardened concrete structure that causes problem steel passive state ensuring. Thus mixing plasticized actualizes search for means corrosion prevention. Alkali-activated slag cements (furth...
It is well known that in geotechnical engineering, soil stabilization using cement one of the appropriate approaches for enhancing characteristics. With respect to zeolite, its impact on characteristics cemented has not been fully evaluated. Thus, current research, a set laboratory tests including standard Proctor compaction and direct shear (DSTs) considering four contents (2, 4, 6, 8% sand dr...
The secondary aluminum ash is the black slag left after primary extracted from metal aluminum. To address environmental pollution and resource waste caused by accumulation landfill of ash, this study fabricated non-fired bricks using as principal raw material, which was supplemented cement, slaked lime, gypsum engineering sand. effects mix proportions various admixtures on mechanical properties...
BACKGROUND Abdominal aortic calcium (AAC) and coronary artery calcium (CAC) independently and similarly predict cardiovascular disease (CVD) events. The standard AAC and CAC score, the Agatston method, upweights for greater calcium density, thereby modeling higher calcium density as a CVD hazard. METHODS AND RESULTS Computed tomography scans were used to measure AAC and CAC volume and density...
PURPOSE Coronary artery calcium (CAC) is a specific indicator of and an independent risk factor for atherosclerosis; however, calcium scoring may miss noncalcified plaques, which may have clinical importance. The aim of this study was both to identify the presence and extent of coronary plaques during computed tomography coronary angiography (CTCA) in patients with a zero CAC score and to evalu...
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