Summary
This examine centered on the carbonation resistance of concretes incorporating dolomite powder with water–binder ratio (w/b) of 0.55 and 0.36. The micro-morphology, micro-pore construction and carbonation depth of cement-based supplies incorporating dolomite powder have been investigated by scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and carbonization check field. The 28-day carbonation depth of concretes with a w/b of 0.55 within the case of dolomite powder at 50 wt% substitute degree decreased by 39.62% in contrast with that of pure concretes. The carbonation resistance of concretes was improved with rising dolomite powder dosage as a consequence of the truth that dolomite powder had the pore refinement effectivity on the carbonated cement pastes. The service lifetime of concretes with a w/b of 0.55 incorporating dolomite powder underneath pure carbonation situation was obtained based mostly on Alekseyev’s carbonation correction mannequin. The sturdiness lifetime of concrete construction with a w/b of 0.55 was extended with the addition of dolomite powder. After carbonation for 28 days, concretes with a w/b of 0.36 have been hardly affected by carbonation corrosion. The pore construction of concretes with a w/b of 0.36 grew to become dense, inhibiting the penetration of CO2 into the concretes as a consequence of a decrease water–binder ratio.
