Case Study Of The Effect Of Remain Clinker Consumption On The Technical Characteristics Of Cement And Concrete

One of the major concerns of concrete manufacturers is the use of cements resulting from the depot of clinker and remain in cement plants. Depoted clinker is exposed to rain and surface hydration reduces the quality. Therefore, a laboratory operation was designed. During this study, a ton of Portland clinker type 1-425 was prepared and stored in a roofless area. Cementing was performed with a laboratory mill from this clinker at 1 day, 1, 2, 3 and 6 months. For uniformity, fineness was constant in all five cement samples and Blaine index of 3100±100 cm2/gr was considered. Physical tests of cement including blaine, setting time, residue on sieves and strength of mortar were performed on all samples. Concrete mixes with constant slump were also made. At each stage, chemical analysis, microscopic studies and clinker gindability were performed. The results of concrete strength showed that clinker stay for 6 months, a decrease in compressive strength of mortar and 28-day concrete causes about 300%. This comparison for clinker showed that during 6 months the alite phase is reduced by about 14% in chemical analysis and about 40% in microscopic studies. (Due to the small depot volume of this project compared to the actual volumes, these results are quite strict and the use of results must be careful.)