Abstract The effect of liquid accelerator on the durability of sprayed concrete was studied. The results show that low-alkaline liquid accelerator distinctly increases the shrinkage of sprayed concrete and decreases the frost resistance and permeability resistance of sprayed concrete. Alkaline-free setting accelerator has little effect on the durability of sprayed concrete. Also, the SEM and pore structure analysis show that low-alkaline liquid setting accelerator makes the hydration product of cement paste loose, increases the content of deleterious pores in cement paste. Alkaline-free setting accelerator promotes the formation of network in the paste and has no distinct effect on pore structure.
Abstract：
The effect of liquid accelerator on the durability of sprayed concrete was studied. The results show that low-alkaline liquid accelerator distinctly increases the shrinkage of sprayed concrete and decreases the frost resistance and permeability resistance of sprayed concrete. Alkaline-free setting accelerator has little effect on the durability of sprayed concrete. Also, the SEM and pore structure analysis show that low-alkaline liquid setting accelerator makes the hydration product of cement paste loose, increases the content of deleterious pores in cement paste. Alkaline-free setting accelerator promotes the formation of network in the paste and has no distinct effect on pore structure.
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Cite this article:
.A Study of the Effects of Liquid Setting Accelerator on Sprayed Concrete Durability[J] MODERN TUNNELLING TECHNOLOGY, 2012,V49(5): 169-174
2012, Vol. 49 