Methods and compositions for the installation of scientifically engineered and constructed unpaved runways are disclosed herein. The compositions are heterogeneous mixtures produced by blending aliphatic or cyclic organic compounds with binders that chemically react with gravel, aggregate, and soil particles to create permanent bonds, resulting in a strengthened and stabilized surface. When blended into the aggregate of a runway surface, the organic compounds act as a carrier fluid, distributing the binder system evenly so particles of all sizes are thoroughly and uniformly coated with the composition. Once the composition is distributed, an adhesion promoting compound reacts with constituents in the aggregate to increase the formation and strength of chemical bonds between particles.

Methods and compositions for the installation of scientifically engineered and constructed unpaved runways are disclosed herein. The compositions are heterogeneous mixtures produced by blending aliphatic or cyclic organic compounds with binders that chemically react with gravel, aggregate, and soil particles to create permanent bonds, resulting in a strengthened and stabilized surface. When blended into the aggregate of a runway surface, the organic compounds act as a carrier fluid, distributing the binder system evenly so particles of all sizes are thoroughly and uniformly coated with the composition. Once the composition is distributed, an adhesion promoting compound reacts with constituents in the aggregate to increase the formation and strength of chemical bonds between particles.

A highly thixotropic 3D printing concrete and a manufacturing method therefor are provided. The weight percentage of each component calculated per cube of concrete is: 35-40% of cement, 0.1-0.4% of polycarboxylate superplasticizer, 0.1-0.4% of polypropylene fiber, 1.0-3.0% of special thixotropic agent for 3D printing concrete, and 12.5-14.5% of water, and the remainder is sand.

A highly thixotropic 3D printing concrete and a manufacturing method therefor are provided. The weight percentage of each component calculated per cube of concrete is: 35-40% of cement, 0.1-0.4% of polycarboxylate superplasticizer, 0.1-0.4% of polypropylene fiber, 1.0-3.0% of special thixotropic agent for 3D printing concrete, and 12.5-14.5% of water, and the remainder is sand.

Methods and compositions for treating a subterranean formation with salt-tolerant cement slurries including treating a salt-containing subterranean formation having sodium salts, potassium salts, magnesium salts, calcium salts, or any combination thereof comprising: providing a salt-tolerant cement slurry comprising: a base fluid, a cementitious material, a pozzolanic material, a salt-tolerant fluid loss additive, a salt additive, and optionally, an elastomer, a weight additive, a fluid loss intensifier, a strengthening agent, a dispersant, or any combination thereof; introducing the salt-tolerant cement slurry into the subterranean formation; and allowing the salt-tolerant cement slurry to set.

Methods and compositions for treating a subterranean formation with salt-tolerant cement slurries including treating a salt-containing subterranean formation having sodium salts, potassium salts, magnesium salts, calcium salts, or any combination thereof comprising: providing a salt-tolerant cement slurry comprising: a base fluid, a cementitious material, a pozzolanic material, a salt-tolerant fluid loss additive, a salt additive, and optionally, an elastomer, a weight additive, a fluid loss intensifier, a strengthening agent, a dispersant, or any combination thereof; introducing the salt-tolerant cement slurry into the subterranean formation; and allowing the salt-tolerant cement slurry to set.

Rheology modifiers comprising cross-linked poly(amino acid) and methods of their use in aqueous compositions. The modifiers comprise cross-linked poly(amino acid) microparticles having a mean equivalent diameter when fully swollen in deionized water of up to 1000 μm, as measured by laser diffraction. In particular, the poly(amino acid) is D-, L- or D,L-Y-poly(glutamic acid). A method of preparing the modifier comprises cross-linking a poly(amino acid), drying the cross-linked poly(amino acid) and grinding the cross-linked poly(amino acid) to have the required diameter.

Methods and compositions for the installation of scientifically engineered and constructed unpaved runways are disclosed herein. The compositions are heterogeneous mixtures produced by blending aliphatic or cyclic organic compounds with binders that chemically react with gravel, aggregate, and soil particles to create permanent bonds, resulting in a strengthened and stabilized surface. When blended into the aggregate of a runway surface, the organic compounds act as a carrier fluid, distributing the binder system evenly so particles of all sizes are thoroughly and uniformly coated with the composition. Once the composition is distributed, an adhesion promoting compound reacts with constituents in the aggregate to increase the formation and strength of chemical bonds between particles.

Methods and compositions for the installation of scientifically engineered and constructed unpaved runways are disclosed herein. The compositions are heterogeneous mixtures produced by blending aliphatic or cyclic organic compounds with binders that chemically react with gravel, aggregate, and soil particles to create permanent bonds, resulting in a strengthened and stabilized surface. When blended into the aggregate of a runway surface, the organic compounds act as a carrier fluid, distributing the binder system evenly so particles of all sizes are thoroughly and uniformly coated with the composition. Once the composition is distributed, an adhesion promoting compound reacts with constituents in the aggregate to increase the formation and strength of chemical bonds between particles.

This invention discloses a double-liquid grouting slurry, its technology and application for super large diameter underwater shield engineering under high water pressure condition. The materials of slurry I are: 35-45 parts of cement clinker; 15-25 parts of slag; 24-35 parts of fly ash; 15-25 parts of steel slag; 5-15 parts of bentonite; 4-10 parts of limestone tailing; 0.3-2.0 parts of water reducing agent; 0.5-2.5 parts of cellulose. The materials of slurry II are: 0.2-3.8 parts of short-cut fiber; 96-99 parts of sodium silicate solution; 0.8-4.8 parts of viscous polymers. This invention generates the double-liquid slurry preparation process including crushing-screening-milling-group mixing-grouped mixing at different speeds, the volume ratio of slurry I and II is 1:1-10:1 during grouting, and the slurry is injected into the shield void through the six-point position technology at the shield tail and 3+2+1 segment splicing synchronous grouting techniques.