Abstract
The overall supporting capacity of ordinary concrete-filled steel tube support (CFSTS) can be decreased due to the self-shrinkage of concrete and the cracks of hardened concrete. The micro-expansive CFSTS is put forward in this paper. Firstly, the optimum proportion of micro-expansion concrete was determined by concrete strength testing. Then, the deformation of micro-expansion CFSTS and ordinary CFSTS under the same load w studied by numerical simulation. Finally, the micro-expansion CFSTS and ordinary CFSTS were applied to the roadway respectively. The results show: The expansive agent content and water reducer content is 11 and 0.5% in the optimum proportion of micro-expansive concrete, respectively. Under the same load, the deformation of the ordinary CFSTS was much larger than that of the micro-expansion CFSTS. The deformations of roof–floor and two sides of roadway supported by the micro-expansion CFSTS were obviously smaller than that of roadway supported by the ordinary CFSTS. The micro-expansion CFSTS has stronger supporting capacity than ordinary CFSTS.
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