碳化对混凝土碱骨料反应的影响

doi:10.13229/j.cnki.jdxbgxb201503015

Abstract

Abstract: In order to reasonably evaluate alkali content generated in alkali-aggregation reaction in concrete, the influence of carbonation on sodium ion concentration distribution inside hardened cement paste was investigated; the alkali-aggregate reaction characteristics in concrete under carbonation were clarified. The results show that sodium chloride distribution is relatively uniform before carbonation; during carbonation process sodium ions in the carbonation area migrate to the non-carbonation area, sodium ion concentration decreases in the carbonation area and increases in the non-carbonation area, and reaches maximum peak value in the carbonation interface. Thus the carbonation increases the sodium ion concentration in non-carbonation area in the concrete and reduces the initial critical sodium ion concentration for alkali aggregate reaction in the concrete that accelerates the alkali aggregate reaction.

Key words: architectural engineering, carbonation, sodium ion, migration of ion, alkali aggregate reaction

CLC Number:

TU528

LIU Jun-zhe, YUAN Wei-jing, HE Zhi-min, BA Ming-fang, CHEN Jian-bin. Influence of carbonation on alkali-aggregate reaction in concrete[J].吉林大学学报(工学版), 2015, 45(3): 783-787.

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