Effects Inspection of Lime as a Substitute for Part of Cement in Concrete Strength

Considering the high consumption of cement in construction works and the low amount of cement production to consumption, every year in working season a long number of projects are closed for a long period of time due to shortage of cement, and this substantially imposes damages to civil projects. Limestone as a substitute for part of cement in concrete can decrease the consumption of cement considerably. Fortunately in Iran there are lime-rich mines and it is considered as one of raw materials in production of cement.
In this research, effects of lime as a replacement of part of cement in compressive strength of concrete are studied and the optimum amount of lime consumption is determined. For effects inspection of lime as a substitute for part of the cement in concrete, for three concrete category, C20, C25 and C30 and in each category for lime values 2.5, 5, 7.5, 10, 15 and 20 percent of cement weight and water to the cement ratios 0.45, 0.5, 0.55 0 and 0. 6 cubic samples 15 × 15 × 15 cm were prepared. After reproduction in laboratory conditions,the pressure of samples the age of 28 days were examined pressure and the results were analyzed. For each concrete category and in each water to cement ratio one sample without lime was considered for comparing samples results. The total number of 168 samples were tested and evaluated.