The effect of carbon dioxide sequestration by Sandcrete structures was investigated as a means of reducing CO2 emissions. Experiments were conducted to determine the
concentration of trioxocarbonate IV (CO32-) in sandcrete samples as well as its effect on soil pH. The results showed that the presence of CO32-in sandcrete samples evidenced the process of carbonation in sandcrete structures and other cement-based material which provides an alternative means of CO2 Sequestration. Also, the concentration of CO32- varied along heights
and horizontal distance within sections of the sandcrete structure. The acidic nature of the soil
close to some sections of the sandcrete structure experienced varying pHs of 6.14 - 6.35 which
gave room for enhanced leaching which seriously undermines the strength of the sandcrete
structure. The percentage concentration differential in the horizontal and vertical directions,
were found to vary widely from 5-46%. This constitutes a potential danger i.e. cracking and
possible collapse of the structure. The results of calculated diffusivity values and concentration
gradients of the carbonate ion conformed with results obtained using a predictive model which
helped in monitoring the migration patterns of CO3
2
- in the sandcrete structure
