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
DOI:
10.14359/8119
Date:
2/1/1960
Abstract:
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