Experimental study on mix proportion and the strength of law-grade magnesite hollow block

In this paper, the properties of test block and hollow block made of low-grade magnesite is analysed and studied. First, in order to get the results, the X-ray diffraction analysis was carried out on the phases composition of low-grade magnesite. Then, the influence is researched successively by orthogonal experimental design of water consumption, water-cement ratio, sand ratio and building gypsum on the compressive intensity of test block which can get the best Mix. Finally, the optimum mix ratio of magnesite hollow block is obtained by using the vibration extrusion method to prepare the traditional size distribution concrete hollow block, and the strength relationship between magnesite hollow block and traditional block is solved by linear regression equation. The conclusions shows: compressive strength of hollow block presents a tendency that decreased first and then increased, and strength ranks of all first group hollow blocks exceed MU10. (paper)