A rheometric approach to investigate the effect of cellulose ether on crack mitigation in earth-based concrete

This study investigates the impact of cellulose ethers (CE), particularly Hydroxyethyl Methyl Cellulose (HEMC), on the properties of earth-concrete mixes, focusing on both micro and macro-scale analyses. At the micro-scale, CE's influence on rheological responses and particle interactions was examined, revealing the formation of a robust network that enhances critical strain and yield stress, particularly with higher viscosity polymers. Analysis of total organic carbon in the pore solution indicated partial polymer adsorption, crucial for bridging solid particles and strengthening interparticle interactions. Moving to the macro-scale evaluation, in terms of compressive strength at 28 days, a notable increase was observed. Regarding shrinkage reduction, no clear correlation was found between polymer addition and shrinkage decrease in both stabilized and unstabilized earth mixes. Moreover, CE significantly mitigated crack formation in macro-scale samples, with the most pronounced effect seen in stabilized earth mixes—83% of tested mixes showed improvement compared to 45% in unstabilized mixes. The presence of CaCO₃ formation further suggests its influence when combined with cellulose-based polymers. In conclusion, CE enhances the mechanical properties of earth-concrete mixes, offering promising applications in sustainable construction practices.