What are the causes of retraction in concrete? I. Chemical retraction: contraction of non-evaporable water during concrete hardening. II. Capillar...
What are the causes of retraction in concrete?
I. Chemical retraction: contraction of non-evaporable water during concrete hardening.
II. Capillary retraction: occurs due to partial evaporation of capillary water and loss of adsorbed water.
III. Retraction by carbonation: Ca(OH)2 + CO2 → CaCO3 + H2O (occurs with a decrease in volume).
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I, II, and III are correct.
I. Chemical retraction: contraction of non-evaporable water during concrete hardening.
II. Capillary retraction: occurs due to partial evaporation of capillary water and loss of adsorbed water.
III. Retraction by carbonation: Ca(OH)2 + CO2 → CaCO3 + H2O (occurs with a decrease in volume).
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I, II, and III are correct.
💡 1 Resposta
Ed 
As causas de retração no concreto são: I. Retração química: contração da água não evaporável durante o endurecimento do concreto. II. Retração capilar: ocorre devido à evaporação parcial da água capilar e perda de água adsorvida. III. Retração por carbonatação: Ca(OH)2 + CO2 → CaCO3 + H2O (ocorre com uma diminuição de volume). A alternativa correta é a letra e) I, II e III estão corretas.
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