Preparation of 3D Printed Mortar from Yellow River Extra Fine Sand
With the expansion of the application of 3D printing concrete in engineering,in order to alleviate the shortage of natural medium-coarse sand resources,the Yellow River ultra-fine sand was used to replace part of medium-coarse sand to prepare 3D printing mortar.The orthogonal test of three factors(the dosage of Yellow River ultra-fine sand,water-binder ratio,and water reducer)at three levels was designed.By measuring the printability of mortar,the mix proportion was determined,and the compressive strength of 3D printing mortar in three directions was measured.The results show that when the Yellow River superfine sand content is 20％,the water-binder ratio is 0.34,and the water reducer is 0.12％,the printability of 3D printing mortar is satisfied,and the compressive strength is anisotropic.The compressive strength is the largest along the X axis(print direction),and the 7 d compressive strength is 22 MPa,which is less than that of the casting specimen at the same time.
3D printed mortarYellow River extra fine sandprintable propertiescompressive strength
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