Disclosed herein are thermodynamically stable cement systems comprising a curing agent mixed with a CAC. The curing agent can be hydrophilic to attract bound water. In such a manner, the addition of the curing agent can treat the CAC. The treated material can then be cured to form a thermodynamically stable cement material. The curing agent can comprise a natural fiber material that comprises cellulose. Alternatively, or in addition, the curing agent can comprise cellulose nanoparticles, such as cellulose nanofibrils (CNFs) or cellulose nanocrystals (CNCs). Also disclosed herein are methods of making the same.

A carbonized brick of recycled concrete powders and a preparation method thereof are provided, belonging to the field of concrete materials. The preparation method includes: adding composition A to a liquid storage tank; introducing composition B into the liquid storage tank to react with a solid waste solution to generate calcium bicarbonate solution; filling recycled powders into a molding die, decomposing the calcium bicarbonate solution by heat, reacting generated carbon dioxide with calcium ions leached from a CSH gel in the recycled powders to produce calcium carbonate, and precipitating, crystallizing and cementing in the molding die together with calcium carbonate produced by decomposing calcium bicarbonate solution, and resulting in strength of the recycled powders.

A method for simulating polyurethane permeation grouting diffusion includes constructing a geometric model of permeation grouting diffusion of polyurethane in a porous medium to be injected based on physical property data of the porous medium to be injected; establishing a physical field of the geometric model using a Richards equation and a dilute species transport equation for a porous medium, and adjusting the geometric model based on a material property parameter of the geometric model obtained based on the physical field; setting a boundary condition and an initial value for an adjusted geometric model, and performing mesh division on the adjusted geometric model based on a local refinement method to obtain a simulation model for permeation grouting diffusion; and solving the simulation model for permeation grouting diffusion using a transient solver to complete the simulation of permeation grouting diffusion of the polyurethane in the porous medium to be injected.