Influence of dimension of test specimen on alkali-aggregate reactive expansion

The influence of the dimension of the test specimen on the expansion of bot h alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR) is studi ed in this paper. The results show that the dimension of fire test specimen markedly influences ASR expansion, but not ACR expansion. For ASR expansio n, the larger the aggregate the greater the influence of the test specimen dimension. From two processes of the transference of heat and the transfere nce of mass, the reason that test specimen dimension influences alkali-aggr egate reactive (AAR) expansion is analyzed. The loss of the activated compo und in the aggregate is considered an important reason.