Artificial Carbonation of Concrete Masonry Units


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Title: Artificial Carbonation of Concrete Masonry Units

Author(s): Henry T. Toennies

Publication: Journal Proceedings

Volume: 56

Issue: 2

Appears on pages(s): 737-756

Keywords: none

Date: 2/1/1960

Research to develop a process of artifical carbonation of concrete masonry units is described. A process cf hastening carbonation (preshrinking) of masonry units would eliminate subsequent atmospheric carbonation and attendant shrinkage after the units were in a wall. Research was prompted by the feasibility of artifically carbonating concrete masonry units, using as a source of carbon dioxide the flue gases from combustion in steam boilers adjunct to steam curing. Flue gas carbonation effected reductions in early-age drying shrinkage of masonry units. Reductions varied with carbonation time, temperature, and precarbonation moisture condition of units. Greatest reductions accompanied treatment at elevated temperatures immediately after com-pletion of steam curing. Early-age shrinkage benefits due to carbonation were reflected in total shrinkage with time during 10 months of atmospheric exposure. The effect of carbonation on other measured properties of concrete mason ry appeared minor. Physical