Study On Physicochemical Properties And Properties Of Modified Materials In High Temperature Treatment Of Pisha Sandstone

Pisha Sandstone is an underdeveloped rock interlayer.Due to the low degree of diagenesis,arsenic sandstone has the characteristics of easy weathering,weak erosion resistance,and easy collapse in water.The characteristics of Pisha Sandstone collapsing with water have exacerbated the soil erosion and ecological degradation of the Loess Plateau,resulting in a large amount of coarse sediment,which has promoted the siltation of the lower Yellow River and brought hidden dangers to the flood control safety of the middle and lower Yellow River.This paper studies the performance of high-temperature calcination and mechanical milling to treat Pisha Sandstone and its modified materials,and explores the feasibility of using Pisha Sandstone to develop modified Pisha Sandstone materials that can meet the performance requirements of local soil and water conservation engineering materials.And with the help of laser particle size analyzer(laser particle size analysis),X-ray fluorescence spectrometer(XRF),X-ray powder diffractometer(XRD),thermogravimetric-differential thermal synchronization analyzer(TG-DTG),Fourier transform infrared spectrometer(FTIR)and field emission scanning electron microscope(SEM)and other analytical methods were used to study the erosion mechanism of Pisha Sandstone and the properties of modified materials.The research results are as follows:In this paper,the effects of high temperature and mechanical milling treatment on the basic properties of Pisha Sandstone were analyzed by means of laser grain size,XRF,XRD,TG-DTG,and FTIR after the high-temperature calcination and mechanical milling of Pisha Sandstone.The experimental results show that the mineral composition of argillaceous sandstone changes after high temperature treatment,and the amount of free water and bound water in clay minerals is significantly reduced.There is an increase;the number of small particles in the Pisha Sandstone significantly increased after mechanical milling,the particle size of the particles decreased,and the specific surface area increased.High temperature and mechanical milling can increase the mineral activity of the Pisha Sandstone.After researching the basic properties of the Pisha Sandstone after high temperature calcination and mechanical milling,the macroscopic and microscopic aspects of the activity of the Pisha Sandstone after treatment were studied.Studies have shown that,as far as the macroscopic aspect is concerned,as the Pisha Sandstone calcination temperature increases,the activity index increases accordingly.However,when the calcination temperature is800 ?,the activity index of the test piece increases,because the calcination temperature is too high,resulting in sintering,Thereby changing the aggregate gradation of the test piece.Mechanical abrasion has a significant effect on the activity index of Pisha Sandstone.Since the specific surface area of Pisha Sandstone increases after mechanical powder,the reaction of Pisha Sandstone is complete,so the activity of Pisha Sandstone will also increase correspondingly.For the microcosm,the Pisha Sandstone after high temperature and milling treatment was dissolved in NaOH solutions with different concentrations to study the dissolution of(Ca),silicon(Si)and aluminum(Al)elements in Pisha Sandstone under the action of alkali dissolution the law is to characterize the activity of Pisha Sandstone after different treatment methods.The results show that in the reaction environment at room temperature of 20 ?,the dissolution rate of silicon(Si)and aluminum(Al)increases,and the dissolution rate of calcium(Ca)element decreases with the increase of the calcination temperature of the Pisha Sandstone.After mechanical milling,the reaction efficiency increases due to the increase of the surface area of the Pisha Sandstone,resulting in a decrease in the dissolution rate of calcium(Ca),silicon(Si),and aluminum(Al).It is because the calcium(Ca),silicon(Si),and aluminum(Al)elements participate in the solid reaction in the solution to form a gelled product during the reaction process,resulting in a reduction in the corresponding ion content.At the same time,as the concentration of NaOH solution increases and the temperature of the reaction environment increases,the amount of silicon(Si)and aluminum(Al)dissolved in the solution increases.The calcium(Ca)element reduces the amount of dissolution due to the formation of gelled products in the reaction in the solid.The effects of high-temperature abrasion,activator content,and cement content on the compressive strength,thermogravimetric-thermal difference,mineral composition,and chemical functional groups of Pisha Sandstone were studied.The research results show that mechanical abrasion and high-temperature calcination can significantly increase the compressive strength of vermiculite.The compressive strength of concrete modified by Pisha Sandstone increased with the increase of cement content.The amount and modulus of the modifier water glass have a corresponding effect on the compressive strength of the modified Pisha Sandstone specimens.The compressive strength of the modified Pisha Sandstone specimens increased with the increase of water glass content,and decreased with the increase of water glass modulus.According to the analysis of the results of XRD,TG-DTG,FTIR and SEM,the compressive strength of the modified test piece is provided only by the mechanical bite force and friction resistance between the particles to the friction resistance,mechanical bite force and hydrated gel Provided together.