Experimental Research For Round Hole Space Of Soundless Cracking Parameters For Concrete Structure

Static Cracking agent is a inorganic compounds which is given priority to with calcium oxidet by high temperature treatment. it has a high expansion performance. Compared with ordinary blasting technology, it do not produce noise or pollution, it can effectively control blasting effect.On the basis of summarizing the domestic and foreign research results,by experiment under the condition of volume rate changes over time and with the relationship between temperature changes over time. Test to select the water temperature 30℃,40℃,50℃,60℃, water ratio agent at 0.25,0.3,0.35,0.3.The experimental results show that the influence of water temperature in the early stage of the reaction mixture is very large, The higher the water temperature is, the shorter the volume change rate in the early time, but the change of temperature effect on the final volume change rate is not very big; The influence of water temperature in the early stage of the reaction mixture is very big; The higher the temperature is, the shorter the early stage maintain, But other stage of the reaction has little influence,it has littie influence on the maximum temperature.Water ratio agent dose response greatly influenced on the highest temperature,The greater the water ratio agent is, the smaller the maximum temperature, and the influence on the final volume change rate is not very obviousFor the crushing effect of different hole space of concrete to static cracking agent, by setting acoustic measurement test and strain measurement test to study the internal cracks of block and the surface strain changes. Test to select 300 mm and 400 mm hole distance, the size of the respective concrete is 600 mm X 400 mm X 600 mm and 700 mm X 400 mm X 400 mm.Test results show that the arrangement of the pitch has much influence on the crushing effect of static Cracking agent. The test results show that 300 mm hole spacing arise 3 or 4 crack on the surface of the concrete block at each hole, between the two holes have a penetrating cracks. Distributionof other cracks show the randomness. Acoustic measurement data show that fracture of the fastest growing is the crack between the two holes, The development of the cracks is gradually ftom the surface to internal; For 400 mm hole, it arise situated 3 crack on the surface of the concrete block at each hole, between the two holes do not have a penetrating cracks, the hole near the crack distribution is relatively consistent, Only one crack along the minimum resistance line direction, the other two are present certain Angle with the minimum resistance line. Crack is situated in progressive development...