Calcium leaching resistance of cement composites with liquid-crystal display glass powder

초록

This study explores the calcium leaching resistance of cement composite with liquid -crystal display glass powder (LCDGP). Authors compare LCDGP with other pozzolanic materials, fly ash and soda -lime glass powder, replacing 20% of the cement. Results show that LCDGP reduces the leaching rate by 47.2% and hardness degradation depth by 28.6%, compared to the fly ashblended mixture. High pozzolanic reactivity of LCDGP lowers the initial calcium hydroxide and total porosity including a decreased volume of pores exceeding the capillary pore size, resulting in a dense microstructure. Consequently, these effectively delay calcium hydroxide dissolution and calcium -silicate -hydrate decalcification. LCDGP-blended mixture shows the decreased CS -H gel decalcification depth by 21.4% and exhibits 28.6% less hardness reduction depth compared with fly ash -blended mixture. Based on these findings, authors advocate the potential application of LCDGP as an admixture for concrete structures that are exposed to water.

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