Self-compacting soil-cement with incorporation of sand from construction waste for application in a vertical panel system

Abstract

The aim of this study is to analyse the influence of the incorporation of construction waste (CW) sand on the physical and mechanical behaviour of self-compacting soil-cement (SCSC) mixes, aiming at its application in a monolithic vertical panel system. The research method consists of conducting laboratory tests, considering an initial proportion of cement-soil with a 1:5 ratio, and four additional mixes, in which soil was replaced by CCW sand at intervals of 25% up to 100%, in mass. In the fresh state, tests were conducted to determine fluid consistency (ranging from 660 to 750 mm), mass density and the air content incorporated in the mixes. In the hardened state, simple compressive strength, water absorption and voids content tests were undertaken. Improvements in the workability and mass flow rate were observed in the hybrid mixes, and higher mechanical strengths were obtained with the incorporation of 25% and 50% of CCW sand, indicating an ideal dosage within this interval. In addition, the incorporation of CCW sand reduced water absorption, with values below 20% in all hybrid mixes. The study concluded that the use of CCW sand in SCSC mixes has the potential to be applied in the Vertical Monolithic Panel System.

Keywords:
Soil-cement; Verrical panel system; Recycled sand