Experimental Study On High Performance Concrete With Resistance To Abrasion From Bed Load Sediment

This paper combined with the practical engineering in Xinjiang province——the sediment transporting channel which is located in the downstream of the sand funnel of the beginning of the Jin Gou River’s diversion channel. Through the way of laboratory test and field test to conduct the experimental and applied research of the high performance anti scouring and abrasive resistant concrete in solving large diameter grinding bed-load sediment erosion damage problem on the water flowing surface of drainage buildings in Xinjiang. Through the experimental study have the following conclusions:(1)The anti scouring and abrasive resistant performance of concrete is greatly influenced by aggregate types. Contrasting the different experimental result of the anti abrasion test on concrete in the two aggregate types of iron ore, iron sand and natural sand, natural stone, and different combinations of these two kinds of aggregate,we found that:the anti scouring and abrasive resistant performance of concrete improve along with the increase of the iron ore and iron sand proportion in the concrete, and the influence of coarse aggregate on its performance is greater than fine aggregate.(2)Reducing the water cement ratio is beneficial to enhance the anti scouring and abrasive resistant performance of concrete. For the concrete which resist the bed-load sediment scour and abrasion, it is necessary to control the water cement ratio in a smaller range. From the experiment we also found: when the water cement ratio is further reduced from 0.31 to 0.31 and 0.21, the effect of improvement in the anti scouring and abrasive resistant performance of concrete is not obvious in the situation of the materials and the concrete mix proportion used in this experiment.(3)There is maximum particle size effect of coarse aggregate in the anti scouring and abrasive resistant performance of concrete. And the change of maximum particle size of coarse aggregate influence the anti scouring and abrasive resistant performance of concrete is greater than the compressive strength of concrete. For the anti scouring and abrasive resistant performance of concrete, there is an optimal maximum particle size of the aggregate or an optimal maximum particle size range of the aggregate in choosing the maximum particle size of coarse aggregate. In the situation of the materials and the concrete mix proportion used in this experiment, the optimal maximum particle size of the aggregate Dmax is 10 mm, and optimal maximum particle size range of the aggregate is: Dmax=10 mm~20 mm.(4)The experimental result of the underwater steel ball method can reflect the anti scouring and abrasive resistant performance of concrete in some degree, but the scouring and abrasive resistant strength on the concrete of this method is too small,the experimental result is greatly influenced by the surface mortar of concrete. So it is difficult to highlight the difference of the real anti scouring and abrasive resistant performance of different types of aggregate concrete. In the evaluation of the anti scouring and abrasive resistant performance in different bulk density of concrete, wear rate is more reasonable in line with the actual situation of abrasion than the anti scouring and anti wearing strength.(5)In the construction site of the engineering, the construction technology, the construction quality and the curing conditions and other situations have great influence on the high performance concrete’s actual anti scouring and anti wearing ability.