Abstract The precipitation of calcium ions from concrete is one of the main causes that will lead to crystallization in tunnel drainage systems. To study the effect of glass dust on the resistance of concrete to calcium corrosion under contact corrosion conditions, this study prepares some concrete test specimens and cement mortar test specimens by replacing 0%, 10%, 15% and 20% of the cement with equal mass of glass dust to carry out deionized water immersion tests to detect the calcium ion concentration. X-ray diffractometer and scanning electron microscope are used to analyze and study the type, content, microscopic morphology and element composition of the hydrated products of the test specimens. The results show that glass dust can reduce the content of calcium hydroxide (CH) and the precipitation of calcium ions in the hydrated products of the cement mortars, and the best effect is achieved when 10% of glass dust is mixed. When the corrosion lasts 28 d, the microstructure of the cement mortars mixed with glass dust is improved compared with that of cement mortars without any glass dust, but the volcanic ash activity of the glass dust has not yet been fully brought into play.
Abstract：
The precipitation of calcium ions from concrete is one of the main causes that will lead to crystallization in tunnel drainage systems. To study the effect of glass dust on the resistance of concrete to calcium corrosion under contact corrosion conditions, this study prepares some concrete test specimens and cement mortar test specimens by replacing 0%, 10%, 15% and 20% of the cement with equal mass of glass dust to carry out deionized water immersion tests to detect the calcium ion concentration. X-ray diffractometer and scanning electron microscope are used to analyze and study the type, content, microscopic morphology and element composition of the hydrated products of the test specimens. The results show that glass dust can reduce the content of calcium hydroxide (CH) and the precipitation of calcium ions in the hydrated products of the cement mortars, and the best effect is achieved when 10% of glass dust is mixed. When the corrosion lasts 28 d, the microstructure of the cement mortars mixed with glass dust is improved compared with that of cement mortars without any glass dust, but the volcanic ash activity of the glass dust has not yet been fully brought into play.
JIANG Yajun1 ZHENG Yi1 YU Liangmin1 CUI Hengtao1 CAO Danyang2
.Effect of Glass Dust on the Resistance of Concrete to Calcium Corrosion under Contact Corrosion Conditions[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 223-229
2023, Vol. 60 