At temperatures less than 85 degrees Fahrenheit, concrete containing slag cement can have longer times of set, when compared with 100 percent portland cement concrete. The study was conducted according to CSA A23.2-14A-94, on 7.5 × 7.5 × 30.5 cm prisms cured at 38 °C and 100% RH over a period of one year. The ASR gels in AAS mortars looked like rosettes, with a lower concentration of calcium than OPC ASR gels. In contrast, aluminium phosphate is more efficient for the stabilization of water-based cuttings (Filippov et al., 2009). Metso (1982) was one of the first to study alkali-aggregate reaction in alkali-activated slag mixtures. If the strength grade of cement is too high, appropriate amount of mixed materials (like fly ash) can be added in order to save the cement consumption. It may also be manufactured by separately grinding Portland cement clinker, gypsum and granulated slag and then mixing them intimately.. Portland slag cement is obtained by mixing, Portland cement clinker, gypsum and granulated slag in suitable proportions and grinding the mixture to get a thorough and intimate mix between the consti- tuents. For Ordinary Portland Cement, The Final Setting Time is 600 minutes (10hrs). Furthermore, this expansion increased with the alkali concentration or the basicity of slags, or the reactive aggregate content (up to 30%). Six samples of each mixture were prepared (dimensions 10 × 10 × 60 mm), with a cement/aggregate ratio of 1:2.25 and w/c of 0.4. Applications. However, it was pointed out that no expansion measured for an alkali content equal to or less than 5% exceeded 0.1%, and such expansions were therefore probably not destructive. The portland slag cement has many advantages over ordinary portland cement (OPC). The strength grades should be selected in line with those of mortar. (1999) investigated several factors affecting the alkali-aggregate reaction, such as the basicity of slags or the concentration of activator. As a binder, it can replace approximately 70–80 wt.% of Portland cement, with 9%–10% reduction of CO 2 emissions from concrete manufacturing for every 10% of Portland cement replaced [37]. Feret40 cited as an example a breakwater at Calais which was removed after 16 years when the concrete was found to be in good condition. 1. Slag is by product of steel production, essentially, a non-metallic product comprising of more than 90% glass with silicates and alumino-silicates of lime. SEM study showed that the surface of the non-reactive calcareous aggregate was attacked, which resulted in the formation, at the paste/aggregate interface, of a whiteish gel having a high calcium content. If the stability of cement tested by autoclave method is qualified, the content of magnesium oxide can be extended to 6.0%. Concrete containing slag cement as partial cement replacement can have a higher slump and improved particle dispersion compared to concrete mixes without slag cement, irrespective of the use of water-reducing admixtures. The fly ash was subjected to XRD test to obtain its chemical composition. The requirements for fineness, setting time and soundness of slag cement are the same to those of ordinary cement. Lime, gypsum and clay can also be used as the cementing materials for mortar and they can be mixed with cement to prepare mixed mortar to save cement and improve the workability of mortar. Volume stability, compressive strength, microstructural and mineralogical characterization were monitored for up to 4 months on OPC and AAS samples. The addition of orthophosphate seems to form a continuous and weakly soluble network in the cement matrix, which reduces the release of the salt. In acceptance tests for cement,time of setting. 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