핵자기 공명을 활용한 가열에 따른 나노실리카 혼입 시멘트 페이스트 내 칼슘실리케이트 수화물 구조 변화 해석

Investigation on the Structural Changes of Calcium Silicate Hydrates in Nanosilica-incorporated Cement Pastes exposed to Heating using Nuclear Magnetic Resonance Spectroscopy

When concrete is exposed to fire, the thermal decomposition of hydrates of Portland cement paste results in critical damage to the concrete structure of a building. Recently, nanosilica arose as the effective nano-additive which can enhance the thermal resistance of the cementitious materials. However, the mechanism of the enhancement was not elucidated specifically. In this study, we investigated the properties of calcium silicate hydrates(C-S-H)of the nanosilica incorporated cement paste after heating to different heating temperatures (200℃, 500℃, and 800℃) by 29Si nuclear magnetic resonance. The results showed that the polymerization of C-S-H of nanosilica incorporated samples was larger than ordinary cement paste after heating to 200℃, and C-S-H formed during heating process to 500℃ due to the pozzolanic reaction during heating process.