사면보강 그라우팅의 조기강도 발현을 위한 혼화제 개발 연구

초록

This study developed a new admixture for cement-based grout used in ground injection by combining four reaction products. Three of the reaction products were synthesized at high temperatures to induce alkali activation, while the remaining one was synthesized at room temperature to secure flow. Specimens using the developed admixture (DP series) were prepared at various water-cement (W/C) ratios to conduct flow, compressive strength, and pull-out tests, followed by a comparative analysis against plain and commercial admixture specimens. The experimental results showed that DP26 (W/C 26%), using the developed admixture, achieved a flow value similar to that of GP40 (W/C 40%) using a commercial admixture. This confirmed the excellent injectability while reducing water consumption by approximately 35% compared to the benchmark. Furthermore, the seven-day compressive strength of DP26 was 37.75 MPa, representing approximately 57.9% improvement over GP40. In conclusion, the DP26 (W/C 26%) mix using the developed admixture was identified as the optimal formulation satisfying the complex performance requirements of flow, compressive strength, and bond strength.

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