| 要旨 |
Various particle sizes of hardened cement paste powder (HCPW) were carbonated by dripping method to compare with HCPW under a constant relative humidity of 60% or 85%. And measure and analyze the impact of different drip intervals on the carbonation process by TGA, FTIR and SEM-EDS. The results indicate that after 1 day of carbonation, the rate of calcium hydroxide in HCPW with 0.3-0.6mm was less than 5% in the dripping samples, around 13% at RH60, and around 8% at RH85. After 28 days, the CO2 absorption of 0.15-0.3mm increased by 71%, 33% compared to RH60, RH85, respectively. Keywords: CO2 absorption, hardened cement paste powder, carbonation, particle size, dripping method |