HIGH CARBONATION-RESISTANT AUTOCLAVED LIGHTWEIGHT CONCRETE

摘要

PROBLEM TO BE SOLVED: To provide high carbonation-resistant autoclaved lightweight concrete obtained by surely and efficiently selecting and collecting autoclaved lightweight concrete (ALC) having excellent carbonation resistance for a short time with sufficient reproducibility by a simple operation.;SOLUTION: The high carbonation-resistant ALC having carbonation degree less than 10% is simply and surely selected and collected by carrying out the spectrum analysis of the ALC by ²⁹Si MAS NMR to compute (peak area ratio S)=(Q2s/Q3s) from peak area Q2s and Q3s which are respectively calculated based on the spectrum of silicon atom Q2 having the coordination number of 2 and silicon atom Q3 having the coordination number of 3 and confirming and judging that the peak area ratio is in a range of 2.0≤S≤2.5 where the crystallization of tobermorite progresses to increase the resistance against the carbonation which is a decomposition reaction of the tobermorite. In a building using the ALC, the durable period is prolonged, the repairing or the improvement cost is reduced and the generation the industrial waste is suppressed.;COPYRIGHT: (C)2006,JPO&NCIPI