Experimental Study on Influence of Machine-made Sand on Strength of Shotcrete
Taking the machine-made sand of Jinshandian Iron Mine as the research object,X-ray dif-fraction test,sieve test and compressive strength test of two different kinds of mother-rock machine-made sand are carried out respectively,which compared with yellow sand.The test results show that the compres-sive strength of shotcrete with igneous parent rock is the highest,followed by yellow sand and sedimentary rock.The content of feldspar is the main factor affecting the strength of machine-made sand concrete,fol-lowed by the crystalline structure and grain size of minerals.The compressive strength of machine-made sand concrete is 14.4％ lower than that of yellow sand concrete because of its high strength and fineness mod-ulus.It is suggested that machine-made sand made of rocks with high feldspar content and moderate com-pressive strength should be used as sand for underground shotcrete.
mechanism sand concreteX-ray diffractionsieve testcompressive strength test
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