Effect of Material Properties on Plastic Shrinkage of Ultra-Fine Sand Pumping Concrete
The influence of mixing fly ash, admixture(including pumping agent, water reducing agent, air-entraining agent), polypropylene fiber on plastic shrinkage of ultra-fine sand pumping concrete by using slab test in this paper. The results show that mixing fly ash can significantly reduce plastic crack area of ultra-fine sand pumping concrete, and plastic crack area begins to reduce slowly when the content of fly ash is up to 20%; When the content of water reducing agent is between 0% and 1.5%, inhibition effects of water reducing agent on plastic shrinkage of ultra-fine sand pumping concrete increase gradually with the content., and the optimum content of water reducing agent is 0.75%; Compared with the water reducer, the effect of mixing pumping agent or air-entraining agent is better; Mixing polypropylene fiber can reduce plastic crack area of ultra-fine sand pumping concrete, slenderizing the crack, and the effect becomes greater with the content of polypropylene fiber.
Jinglong Bu, Zhengyi Jiang and Sihai Jiao
Y. Y. Zhang et al., "Effect of Material Properties on Plastic Shrinkage of Ultra-Fine Sand Pumping Concrete", Advanced Materials Research, Vols. 150-151, pp. 588-593, 2011