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 ...

The influence of a chloride-ion adsorption agent (Cl agent in short), composed of zeolite, calcium aluminate hydrate and calcium nitrite, on the ingress of chloride ions into concrete and mortar has been experimentally studied. The permeability of concrete was measured, and the chloride ion content in mortar was tested. The experimental results reveal that the Cl agent could adsorb chloride ion...

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 ...

Partial replacement and co-hydration of calcium aluminate cement (CAC) with ladle slag was investigated in this study as a pathway valorizing the reducing economic cost CAC. The impact on physical microstructural properties were analysed using different techniques such mechanical strength test, freeze-thaw, sulfate attack, XRD, SEM etc. Thermodynamic modelling used to predict phase assemblages ...

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 ...

A deeper insight into SO3/Al2O3 ratio including the contribution of alumina in slag at early age is required to ensure a properly sulfated cement. In this paper, investigate effect gypsum and slag, emphasis was laid on hydration characteristics C3S-gypsum-slag system during age, which synthesized laboratory with varying Al2O3 contents from 3.69 18.19 wt%. The duration dormant period C3S depende...

Supplementary cementitious materials (SCM) are increasingly used in concrete for economical and environmental reasons. However, the durability of reinforced concretes against, example, corrosion induced by carbonation varies. Here, phase assemblage various cement pastes with/without SCM (slag, fly ash metakaolin), carbonated accelerated conditions (1.5% CO2 65% RH) or not, has been investigated...

Abstract The construction material from anhydrite-II phosphogypsum is dense in structure and has good water resistance. But its disadvantages are low hydration activity long setting time. In this work, modified by adding a composite activator, which made of sulfuric acid steel slag, β-hemihydrate gypsum calcium aluminate cement. With this, the rate clearly increased time shortened. performance ...