Preparation of Non-fired Haydite from Shield Muck and Its Properties

Taking the soil stabilization agent by pozzolanic reaction as binder, and subway shield muck of Ningbo as main raw materials, the specimen of non-fired haydite (NFH) was prepared with the roll extrusion molding method. The physical and mechanical properties, phase composition and micro morphology of the NFH specimen were characterized. The results show that the cylinder compressive strength (CCS) of specimen at different curing ages increases with the increase of the mass ratio of muck to binder (MRMB), and the 28 d CCS of specimen with MRMB being 1:4 is 5.91 MPa. The water absorption rate of specimen decreases with the increase of the MRMB, the water absorption of specimen with MRMB being 1:4 is only 8.37%; The softening coefficient of specimen increases with the increase of the MRMB, which is corresponding to the decrease of the water absorption rate of specimen with the increase of MRMB. The softening coefficient of specimen with MRMB being 1:4 is 0.82, and its main properties meet the requirement of GB/T 1743.2-2010 of Lightweight Aggregate and Its Testing Method for artificial lightweight aggregate.