The effect of using Na2HPO4 solution as mixing liquid in the physicochemical and mechanical properties of calcium aluminate cement (CAC), with a view to a possible reinforcement additive of conventional α-TCP-based CPC was studied. The results showed that the degree of the hydration reaction of CaAl2O4 (CA) increased when Na2HPO4 solution was used as mixing liquid. The porosity of cement was al...

The ability of calcium aluminate cement (CAC) to encapsulate toxic metals (Pb, Zn and Cu) was assessed under two curing conditions. Changes in the consistency and in the setting time were found upon the addition of the nitrates of the target metals. Both Pb and Cu caused a delay in CAC hydration, while Zn accelerated the stiffening of the mortar. Compressive strengths of the metal-doped mortars...

Achieving and controlling the desired strength build-up is important for 3D concrete printing. In this paper, we investigate possibility of using calcium aluminate cement (CAC) as an accelerator Ordinary Portland Cement (OPC) extrusion Both ternary binary systems were studied whereby former, third component was a sulfate source (C$). Experiments are conducted on mixes both in presence absence r...

Macro-defect-free (MDF) cement with high flexure strength has been an active research area over several decades. To study the tensile properties of these materials, it is essential to understand the mode I crack propagation. In this article, cleavage cracking in calcium aluminate cement (CAC)–phenol resin composites is analyzed based on an energy method. The crack-trapping effect of the cement ...

The objective of this paper is to investigate the use calcium aluminate cements as alternative within context nuclear waste stabilization by solidification. Using an external 60Co source, effect γ-radiation on H2 gas production one cement-based materials (cement “Ciment Fondu”) and its stable hydrates, was studied. amount produced these cement pastes found be much lower (up five times less) tha...

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 ...

Cementation of aqueous radioactive waste contaminated with a significant 90Sr is challenging due to the potential radiolysis water contents. Utilization calcium aluminate cement (CAC) modified sodium polyphosphate (CAP) interesting as its content can be reduced by thermal treatment. The present study investigated solidification and stabilization Sr2+ Cl− ions in CAC CAP or without A leaching te...

This study quantifies NOx uptake efficiency and explores binding mechanisms in calcium aluminate cementitious (CAC) materials. Comparison between unmodified TiO2-modified CAC separates intrinsic from those related to photocatalysis. Attributed surface-related heterogeneous reactions, the occurs at nitrite-to-nitrate ratio of 1: 1.3 can be increased with surface area. The photocatalytic reaction...

the major hydraulic phase in all the calcium aluminate cements including ciment fondue is ca (caal2o4). once hydrated, it starts to form the hexagonal crystals of cah10 and c2ah8 that depending on the time and temperature of hydration convert to the cubic crystals of c3ah6 and ah3. the nature, sequence, crystallinity and microstructure of hydrated phases of commercial refractory calcium alumina...