Hydration products of calcium silicates and calcium aluminates often are difficult to identify by X-ray methods. In this study the hydration products of the aluminate phase especially under the influence of additional chloride ions were studied. Special X-ray measurement conditions must be applied for accurate identification including 1. In situ control of relative humidity 2. Exclusion of CO2 ...

Portland cement is the one of the main ingredients in the manufacture of many building materials include concrete composites. The phase composition of hydration products is controlled by means of XRD and DTA/TG analysis. Observations of phase changes and microstructure of maturing cement pastes can also be observed using scanning electron microscopy (SEM) techniques combined with chemical analy...

This paper discusses the design of hybrid alkali-activated binders at ambient temperature, specifically development mixes based on ground granulated blast-furnace slag (GGBFS) with calcium aluminate cement (CAC) as an additive, aiming to obtain high early strength optimised Al incorporation, increased crosslinking and degree polymerisation. The effects 10 wt% CAC replacement GGBFS, activated so...

Calcium aluminate cement (CAC) concretes are desirable owing to their rapid strength development and resistance high temperatures, sulfates acids. They suffer two drawbacks, however, cost loss due conversion of water-rich hydration products more stable structures, resulting in a drop strength. Although its rate is dependent on temperature moisture, the process thermodynamically inevitable but c...

Throughout their service life, concrete structures are exposed to various environmental conditions that affect durability. The cementitious matrix inevitably comes into contact with air, which leads a progressive carbonation reaction. As result of carbonation, changes occur in the microstructure and porosity matrix. Calcium aluminate cement is produced increase resistance composites aggressive ...

OBJECTIVE To characterize the hydration products of white mineral trioxide aggregate (MTA). METHODOLOGY Mineral trioxide aggregate, white Portland cement and bismuth oxide were evaluated using X-ray diffraction (XRD) analysis and Rietveld XRD. The cements were tested un-hydrated and after hydration and curing for 30 days at 37 degrees C. Analysis of hydrated cement leachate was performed week...

Solidia CementTM is a non-hydraulic cement composed primarily of low-lime containing calcium silicate phases such as wollastonite / pseudowollastonite (CaO·SiO2), and rankinite (3CaO·2SiO2). This contrasts the high-lime alite (3CaO·SiO2), belite (2CaO·SiO2), tricalcium aluminate (3CaO·Al2O3), tetracalcium aluminum ferrite (4CaO·Al2O3·Fe2O3), and gypsum (CaSO4·2H2O) phases that comprise ordinary...