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2 2011

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Particles size distribution of quartz sand for AAC production

Matsushita F., Aono Y., Shibata S.

Cement Wapno Beton

2011

nr spec.

7-11

Quartz sand is generally used as a siliceous raw material for AAC production. The growth rate of tobermorite during autoclaving is controlled by dissolution of silica from quartz sand. And also, the theoretical proportion of dissolution of silica from quartz sand depends on Ca/Si ratio of raw materials. Therefore particle size distribution of quartz sand is very important for the production efficiency as well as the mechanical properties of AAC. In this paper, the optimal particle size distribution of quartz sand will be proposed.

Carbonation cracking of reinforced AAC panel

Matsushita F., Aono Y., Shibata S.

Cement Wapno Beton

2011

nr spec.

81-85

Carbonation cracking and its mechanism of AAC have not been reported at all. One of the possible mechanisms of carbonation cracking caused by carbonation shrinkage is investigated. Carbonation shrinkage at the occurrence of cracking was approximately 0.12% both for field study and accelerated carbonation, while carbonation degree was approximately 50% and 35%, respectively. Tensile stress in AAC was calculated to reach tensile strain capacity (0.04-0.05%) at the occurrence of cracking both for field study and accelerated carbonation data. In other words, the proposed mechanism of carbonation cracking was certified.