Analysis on Influence Law and Mechanism of Strength of Recycled Aggregate-industrial Waste Slag Solidified Silt

Abstract

In order to realize the resource utilization of construction waste, industrial waste slag and silt, this paper used Portland cement, mineral waste residue and phosphogypsum composite to make cementing material (CMPS) with construction waste recycled aggregate to solidify silt. The mechanical properties of the solidified silt were analyzed by laboratory solidification test and microscopic examination respectively. In order to clarify the mineral composition, microscopic morphology and pore characteristics of the regenerated aggregate and CMPS solidified silt, X-ray diffractometer (XRD), scanning electron microscope (SEM), and nitrogen adsorption pore analyzer (NA) were used to further explore and analyze the regenerated aggregate and CMPS solidified silt effectively, and further reveal the internal mechanism of the regenerated aggregate and CMPS solidified silt effectively. The experimental results show that the strength of Portland cement-mineral waste residue phosphogypsum terpolymer system curing agent increases by 107.34% than that of single Portland cement solidified silt at 56 d, and the strength of CMPS solidified silt increases by 25.68% under the action of recycled aggregate framework. The curing age and moisture content of the silt have a high correlation with the strength of the solidified silt. Therefore, the influence law of the above two influencing factors on its mechanical properties is further explored and the strength prediction is made. The microscopic test results show that, based on the hydration of Port-land cement and the pozzolans reaction of mineral waste residue, the solidified system has produced calcium silicate hydrate gel and ettringite crystals with gelatinous properties, which helps to fill the pores and form a denser structure.

Keywords

silt solidification / recycled aggregate / industrial waste residue / resource utilization / skeleton action

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature