The influence of ultrafine waste glass powder on the properties of oil well cement-based composite materials

Abstract In order to improve the mechanical properties of oil well cement-based composite materials and achieve harmless treatment of waste glass and recycling of waste resources, this paper evaluates the influence of ultrafine waste glass powder on the working performances, mechanical properties, and permeability of oil well cement-based composite materials. XRD and SEM are used to study the microstructure of waste glass powder cement stone. The results showed that the addition of waste glass powder into cement slurry requires the use of dispersants to adjust the fluidity of the slurry, which slightly shortens the thickening time of the slurry and helps improve its stability and reduce water loss. As the content of glass powder increases, the compressive strength and flexural strength of cement paste increase, while the impact strength first increases and then decreases. The addition of glass powder is more beneficial for the early mechanical properties of cement paste. When the glass powder content is 9%, the compressive strength, flexural strength, and impact resistance of the cement paste cured for one day increased by 71.74%, 48.27%, and 38.03% respectively compared to the blank cement slurry. After three days of curing, the permeability of 12% glass powder cement stone decreased to 0.0103 mD. The addition of glass powder can improve the compactness of cement stone, promote the hydration process of cement slurry, adjust the microstructure of cement slurry, and make the performances of oil well cement-based composite materials more excellent. The research results not only contribute to the design of high-performance oil well cement-based composite materials, but also provide reference for the application of waste glass powder in new fields, reducing the cost of designing high-performance oil well cement-based composite materials.