Summary
This research 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 take a look at field. The 28-day carbonation depth of concretes with a w/b of 0.55 within the case of dolomite powder at 50 wt% alternative degree decreased by 39.62% in contrast with that of pure concretes. The carbonation resistance of concretes was improved with rising dolomite powder dosage resulting from 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 beneath 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 turned dense, inhibiting the penetration of CO2 into the concretes resulting from a decrease water–binder ratio.
