This patent describes a set retarded cement composition which is substantially non-thinning at high temperatures. « lessīorogypsum, which consists mainly of gypsum crystals, B-hemihydrate dissolution rate. Therefore, this result provides evidence that WG can be used as an alternative material to NG in the production of OPC. However, the values obtained for flexural and compressive strength were relatively the same for CMNG and CMWG. This was due to the presence of hemihydrate in WG. Furthermore, CMWG was found to set faster than CMNG, an average of 15.29% and 13.67% faster for the initial and final setting times, respectively. The content of dihydrate and hemihydrates were obtained via DSC/TG, and the results showed that WG and NG contained 12.45% and 1.61% of hemihydrate, respectively. The XRD result of NG revealed the presence of dihydrate while WG contained dihydrate and hemihydrate. The mechanical properties of cement were tested in terms of setting time, flexural and compressive strength. The properties of NG and WG were investigated via X-ray Diffraction (XRD), X-ray fluorescence (XRF) and differential scanning calorimetry (DSC)/thermogravimetric more » (TG) to evaluate the properties of CMNG and CMWG. ![]() The same procedure was repeated with NG to substitute WG to prepare cement natural gypsum (CMNG). ![]() Clinker and 3-5 wt% of WG was ground in a laboratory ball mill to produce cement waste gypsum (CMWG). WG taken from slip casting moulds in a ceramic factory was formed from the hydration of plaster of paris. ![]() The present study is focused on clarifying the influence of waste gypsum (WG) in replacing natural gypsum (NG) in the production of ordinary Portland cement (OPC).
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