Year: 1997
Type: conference-paper
Abstract: Synopsis: Large samples of hcp were prepared with W/C from 0.3 to 0.8 and small prisms of 3/3/90 mm were cut off .After drying the samples at constant rh ranging from 30 to 90% up to equilibrium lengths, CO 2 was introduced and its concentration kept constant at 2%.The length changes were recorded as a function of time.It is shown that carbonation shrinkage of hcp can be well described by the hyperbolic function ∆l/l = at / b+t.(where l is the length, t the time), a and b parameters).The highest carbonation shrinkage reaches 3 to 4 mm/m.The time necessary to reach half of the final shrinkage (the parameter b) is minimum between 50 and 80% rh for all hcp samples studied.After the shrinkage measurements, all prisms were crushed and the CO 2 content, i.e. the CO 2 uptake of all specimens, was determined.The relationship between shrinkage and CO 2 uptake is discussed with respect to the microstructure and the formation of minerals other than calcite.
Author: Y. F. Houst
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W771068067