High-strength And High-performance Mechanism Sand Concrete Proportioning And Ultra-high Pumping Test Research

As cities grow and increase in high-rise building high performance concrete technology, the development of ultra-high performance concrete pumping technology is particularly important. High performance concrete cementitious material mixing amount, less unilateral water, viscosity mixes big, so ultra-high performance concrete pumping construction extremely difficult. In the ultra-high concrete pumping, plugging phenomenon often occurs, possibly even the pumping pressure, burst pipes phenomenon, seriously affect the safety and quality of construction. Ultra-high concrete pumping technology has become a key influence high-rise buildings construction techniques for solving high-rise buildings construction efficiency, quality and safety have high practical value. Sand Guizhou, southwest China less resources, abundant sand resources, Guizhou sand applied to the high-energy high-strength concrete, can solve the shortage of resources, can also ease the pressure on the environment.With paper analyzes the essence of ultra-high performance concrete pumps, Difficulties and key technologies, the impact of each component of concrete pumped concrete and fixed the concrete mix design optimization of various raw materials. Then analyze concrete mix ratio on pumping performance and determine the control value of this ultra-high pumping concrete mixture. Carrying concrete optimization design, through the use of high water reduction superplasticizer, adding higher activity of mineral admixtures(fly ash, composite powders and beads) and adjust the fit of concrete sand ratio Ratio mix optimization design, optimization design of concrete after having both high strength and ultra-high pump characteristics.When performing ultra-high concrete pumping, first select the appropriate pumping equipment, the theoretical calculation of the High Performance Concrete pump sand this formulated to Guiyang Hua Guoyuan twin towers on the top floor(pumping height 335m) required pumping pressure, checking pumping pressure pumping equipment meets the requirements. Penthouse Guiyang Hua Guoyuan twin towers at the pumping pressure pumping equipment output, formulated out of the high performance concrete pumping. In the concrete pumping process, the pumping pipeline strain monitoring, data collection pumping concrete. By tubing strain analysis of the data, analyze the concrete pumping the maximum pumping pressure and the presence or absence of concrete plugging phenomenon. Concluded high performance concrete mix design rule and ultra pumped, both to avoid "accidents" in construction of pumping problems, but also to secure higher strength concrete, greater height and longer distances pumps Get construction, construction of pumping further address safety concerns.