Laboratory research and evaluation of geopolymer cement working fluid system

Abstract

The Portland cement production process has some problems such as high energy consumption and high CO₂ emissions, and the Portland cement has defects such as high brittleness, poor toughness, and poor corrosion resistance. In comparison, geopolymer has the characteristics of wide source of raw materials, energy saving and environmental protection in the production process, good mechanical properties and durability. This paper studies the geopolymer cement working fluid system which can meet to cement site construction. The precursor gel material was formed with the following combinations sinking beads : fly ash : slag = 5 : 3 : 2, and the slow-release activator (Na₂SO₄& Ca(OH)₂) was developed, which can achieve good compressive strength performance and controllable thickening time. The working fluid with a density of 1.90g / cm³ was evaluated. By adding organic phosphate retarder, the thickening time can be adjusted, the compressive strength is more than 14 MPa, the transit time of static gel strength is 12 min, and no channeling occurs when the gas channeling pressure is 300psi ( 2.1MPa ). It has good anti-channeling performance. The elastic modulus after adding fiber is 6.2GPa. The performance of the system meets the requirements of cementing engineering technology. The geopolymer cement working fluid is an ideal cement material.