Keywords : Natural coarse aggregate concrete
Effect of cement content on some properties concrete with natural and partial replacement recycled coarse aggregates
journal of kerbala university,
Volume 11, Issue 2, Pages 124-136
The research was deliberate the increasing cement content effect on some fresh and hard concrete properties in four different cement content mixes with natural coarse aggregate (NAC) and another four same mixes but with replacement 50% of coarse aggregate (RAC) in mix . Getting to better cement content in mix which give increasing ratio mix properties more than cement content increase ratio compares with low and higher than cement content of it . This mix has 359 kg/m3 cement content concrete in natural coarse aggregate (C30) and recycled (50C30) . The increase ratio in compressive strength of natural coarse aggregate concrete was 2.174 more than cement content increase ratio , also recycled coarse aggregate concrete achieves 1.77 more than cement content increase ratio, that’s no happen in another low cement content mix (288 ,319 ) kg/m3 and higher 458 kg/m3. The water absorption 359 kg/m3 cement content concrete was achieved higher absorption decrease ratio /cement content increase ratio get to 1.5 in (C30) and 2.24 for (50C30)
The slump decrease ratio / cement content increase ratio decreased with increase cement content of mix concrete and that is less in increase cement content of mix in two kinds (NAC) and (RAC) concrete .