Title:
ASSESSING SOME MECHANICAL PROPERTIES OF CO2 CURED, SUSTAINABLE NO-FINE CONCRETE

Authors:
Dr. Isam Mohamad Ali

Abstract:
Over the past two decades, more and more attention has been given to the use of emission gases and sustainable concretes. An experimental study was carried out to evaluate the performance of sustainable light weight no-fine concrete (SLNFC) through early exposure to carbon dioxide (CO2) gas. Three categories of SLNFCs were assessed: 1:4, 1:5 and 1:6 (cement: gravel) by weight. Two parameters were used in order to evaluate the strength of SLNFC: CO2 gas concentration and water/cement ratio. Experiments were performed to estimate the fresh (compaction factor test) as well as hardened properties (compressive strength, splitting tensile strength and flexural strength) of SLNFC at 28-day. In addition, density evaluations were also conducted before and after CO2 curing process. The results show an improvement in the mechanical properties of all the investigated SLNFC samples by using the accelerated CO2 curing method. In addition, excessive carbonation rate associated with pure gas carbonation (100% CO2) exhibits highest mechanical performance as compared to control (0% CO2) samples with w/c of 30 %.