Effect of heating device on expansion performance of static crushing agent
Aiming at the problems of low blasting efficiency of static crushing agent at low temperature and easy blasting hole at high temperature,a static crushing agent heating device was designed and manufactured,and the corresponding spray control method,namely internal force balance method,was proposed.The device was used to test the expansion pressure of the static crushing agent at the heating temperature of 60 ℃,80 ℃ and 100 ℃ respectively.The hydration product of the static crushing agent was analyzed by X-ray diffraction,and its image composition was compared and analyzed.The feasibility of the device was verified by the single hole static explosion test of concrete specimen.The results show that the expansion pressure of static crushing agent can be divided into three stages.Heating can significantly improve the hydration reaction rate of static crushing agent,and the influence on the second stage is the most obvious.With the increase of heating temperature,the content of calcium hydroxide in static crushing agent increases sharply.The device can increase the radial expansion pressure of static crushing agent to 40 MPa within 5 h,and the concrete specimen can be broken in 33 min at the earliest,and no spout phenomenon occurs in the process.
rapid static blastingheating spray control devicesoundless cracking agentoncotic pressure
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