Analysis on the carbonation resistance of concretes containing dolomite powder: Fullerenes, Nanotubes and Carbon Nanostructures: Vol 0, No 0

Summary

This research targeted 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 had 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 growing 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 below 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 had 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 as a consequence of a decrease water–binder ratio.