تاثير عيار سيمان بر مقاومت، جذب آب و انتشار يون كلريد در بتن هاي داراي نسبت آب به سيمان ثابت

The Effect of Cement Content on Strength, Water Absorption and Chloride Ion Diffusion in Concretes with Constant W/C Ratio

This study presents the effect different levels of cement content with compressive strength, capillary water absorption and chloride ion diffusion in concretes with constant water/cement (W/C) ratio. W/C ratios were 0.4, 0.45 and 0.5 that for each of them four concrete mixes were prepared w ith cement contents 300, 350, 400 and 450 kg/m3. Type II Portland cement and aggregate with maximum particle size of 19 mm were used. Test results indicate that at constant W/C ratio, compressive strength increases and water absorption and chloride ion diffusion decreases when cement content in the mix decreases from 450 to 350 kg/m3. Similar results is also observed when cement content increase from 300 to 350 kg/mJ. As a result, it is expected that for W/C ratios ranged from 0.4 to 0.5, mixes with cement content 350 kg/m" have more suitable performance in aggressive environment than other mixes.