Research On Fractal Characteristics Of The Super-fine Sand In Liaohe River And Experiment Of The Super-fine Sand Concrete

Sand, as the main component of the fine aggregate in concrete, is widely used in construction engineering. The kind of sand mainly is produced in natural river, and their fineness modulus is between1.6and3.7, mostly above2.2, which is called medium sand or coarse sand. However, at present, mining river sand is spreading unchecked in our country, so that the production of medium sand and coarse sand fall sharply, and relatively, the production of the fine sand rapidly increase. There is more and more super-fine sand, whose average particle size is less than0.25mm, and fineness modulus is less than1.5, so it’s our original intention to regard the super-fine sand in Liaohe River as the research object to exploit its potential value.At present, there is a large number of the super-fine sand, and they distributed widely, the region of middle and lower Liaohe River is one of the biggest origins. The sand’s supply can’t meet the demand of local increasingly development and the influence is more and more distinct. Based on the advantage of the super-fine sand resource in Liaohe River, this article put forward the topic to systemic research the super-fine sand of the middle and lower Liaohe River, which not only contribute to the engineering application, but also timely open a new field to study the resource and comprehensive utilization of the super-fine sand and lay a foundation for carrying out related deeper research. The main contents and conclusions are as follows:(1) Ascertain distribution of the super-fine sand sample, which range betwween0.6mm and0.075mm, by encrypted sieving experiment. Calculate the fractal dimension Dm by using corresponding calculation formula in fractal theory and sum up the fractal characteristics of the sample’s particle distribution.(2) Acquire the image of the super-fine sand by Scan Electron Microscope(SEM), and process them according to the steps such as Binary, Smooth, Sharpening and so on by using the software, ImageJ. Based on the extraction of the super-fine sand’s number and particle size, ascertain the distribution of particle swarm and analysis its fractal characteristic by calculate the fractal dimension DN. Meanwhile, according to extracted morphological parameters value, analysis the correlation between different parameters and explore particle morphology fractal characteristics by means of calculating the fractal dimension DR.(3) Conduct the super-fine sand concrete preparation, and research the influence of the super-fine sand on corresponding concrete property. Determine the workability and strength between different the super-fine sand concrete; comparing with common medium sand concrete, it’s known that the strength of the super-fine sand concrete will decline as the water cement ratio increasing, and it will reach the peak value when the sand ratio is27%; the liquidity of the super-fine sand concrete is lower than common medium sand concrete with the same condition.This study can be said to be a basic research, which contains significant innovation. A number of fresh information acquired in this dissertation contain very important application value on the local engineering and have very important academic significance for further research on the super-fine sand.