국외전문학술

Pyeon, S., Kim, G., Lee, S., & Nam, J. (2022). Internal Curing Effect of Waste Glass Beads on High-Strength Cement Composites. Applied Sciences, 12(16), 8385.
Pyeon, S., Kim, G., Lee, S., & Nam, J. (2022). Internal Curing Effect of Waste Glass Beads on High-Strength Cement Composites. Applied Sciences, 12(16), 8385.
작성자 건설재료시공학연구실
조회수 424 등록일 2022.09.27
주저자 Sujeong Pyeon
교신저자
공동저자 Gyuyong Kim, Sangsoo Lee, Jeongsoo Nam
학술지명 Applied science

High-strength concrete (HSC) uses binders and microfillers with ultrafine particles, such as silica fume. The resulting dense internal hydration structure rapidly decreases HSC humidity, causing shrinkage cracks and affecting internal hydration. Herein, the hydration degree inside high-strength cement composites (HSCCs) was examined using waste glass beads (WGBs) as lightweight aggregates (LWAs). Moreover, unreacted hydrate reduction and hydrate formation tendencies were investigated. WGBs with particle sizes within 2.00–6.00 mm were added at ratios of 5%, 10%, and 20% after pre-wetting. The increased number of hydrates inside the specimens were examined under steam curing (80 °C) and room temperature curing (25 °C). The strength decreased as the WGB content increased. Thermogravimetric, X-ray diffraction, and Si nuclear magnetic resonance analyses revealed that the hydration degree of Si inside HSCCs changed when the content of pre-wetted LWAs changed. A visual inspection of the specimen cross-section and scanning electron microscopy–energy-dispersive X-ray spectrometry (SEM–EDS) analysis revealed the moisture trapped inside WGB pores and the hydration tendency. Under steam curing and room temperature curing, the paste contained different amounts of hydrates, depending on WGB content. Moreover, water-absorbed WGBs were continuously desorbed through SEM–EDS, and hydrates were present in WGB pores. 


https://doi.org/10.3390/app12168385