A novel supplementary cementitious material based on calcined drill cuttings with waste glass to accelerate cement hydration

Water-based drill cuttings, a solid waste from oil and gas fields, have been utilized as supplementary cementi-tious material after calcination and grinding. However, the comparatively low silica of water-based drill cuttings limits the replacement of ordinary Portland cement. The issue can be solved by mixing water-based drill cuttings with waste glass residue, which contains high silica and can melt during calcination. This paper investigates the effects of calcination temperature and waste glass residue on cured specimens' compressive strength. Experi-mental results indicated that the best product was obtained by mixing 20wt% waste glass residue and 80wt% water-based drill cuttings, calcinating at 1000 degrees C, then sieving through 1600 mesh. The 90-day compressive strength of the specimen was 57.12MPa, which was better than the 51.19MPa of the pure cement group. X-ray fluorescence spectroscopy and scanning electron microscopy showed that the waste glass residue melted above 800 degrees C, which increased the product's glass phase and improved its internal structure. Besides, the Isothermal conduction calorimeter and X-ray diffraction spectroscopy indicated that the hydration process has an advanced hydration rate, high total heat release in the early stage, and novel crystalline Chloritoid generation, all of which can enhance mechanical performance.