A cement paste composition includes a curable component including a cementitious material and a zeolitic imidazolate framework-67 (ZIF-67) present in an amount of 0.01 to 3% by weight based on a total weight of the cementitious material. The composition further includes water in an amount of 30 to 50% by weight based on a total weight of the cement paste composition. A cured specimen made from the cement paste composition has a compressive strength of 30 to 80 megapascal (MPa) according to ASTM C109/C109M-21 standard test method, and a direct tensile strength of 1.2 to 2.2 MPa according to ASTM C307-18 standard test method. The ZIF-67 particles are uniformly distributed throughout the cured specimen. A method of producing the cement paste specimen.

A fresh concrete composition for producing a magnetizable concrete, including 250-450 kg/m.sup.3 of cement, 50-150 kg/m.sup.3 of a mineral addition, 2900-3500 kg/m.sup.3 of aggregates containing magnetizable particles, and 100-150 kg/m.sup.3 water, wherein the sand volume is 60 vol.-%.

A cement paste composition includes a curable component including a cementitious material and a zeolitic imidazolate framework-67 (ZIF-67) present in an amount of 0.01 to 3% by weight based on a total weight of the cementitious material. The composition further includes water in an amount of 30 to 50% by weight based on a total weight of the cement paste composition. A cured specimen made from the cement paste composition has a compressive strength of 30 to 80 megapascal (MPa) according to ASTM C109/C109M-21 standard test method, and a direct tensile strength of 1.2 to 2.2 MPa according to ASTM C307-18 standard test method. The ZIF-67 particles are uniformly distributed throughout the cured specimen. A method of producing the cement paste specimen.

In one embodiment, a geopolymer formulation for a building material comprises sand, ground granulated blast furnace slag (GGBFS), fly ash, sodium tetraborate, boric acid, zeolite, sodium caseinate, and SC-9. Optionally, the formulation also comprises additional constituents like sodium metasilicate, sodium hydroxide, magnesium oxide, hemp, basalt fibers, aggregates, and fillers. Building materials manufactured from the geopolymer formulation have high compressive strength, flexural strength, tensile strength, impact resistance, and thermal resistance.

In one embodiment, a geopolymer formulation for a building material comprises sand, ground granulated blast furnace slag (GGBFS), fly ash, sodium tetraborate, boric acid, zeolite, sodium caseinate, and SC-9. Optionally, the formulation also comprises additional constituents like sodium metasilicate, sodium hydroxide, magnesium oxide, hemp, basalt fibers, aggregates, and fillers. Building materials manufactured from the geopolymer formulation have high compressive strength, flexural strength, tensile strength, impact resistance, and thermal resistance.

The present disclosure relates to cement compositions including Portland cement and volcanic ash. An exemplary cement composition includes about 10 wt % to about 85 wt % of Portland cement, and about 10% by weight of cement (BWOC) to about 70% BWOC of volcanic ash.

A cement-based composition and a method of using the same are provided. The cemented-based composition includes a cement-based cementitious material, aggregates, and water. The cement-based cementitious material includes cement and an additive. The additive includes kaolinite, a first carbonyl compound, and a pH buffer. The first carbonyl compound includes ethylene carbonate. The pH buffer includes ethylene carbonate and ethanolamine.

A geopolymeric material is described having compressive strength at 28 days ranging from 15 to 100 N/mm.sup.2, obtainable by curing for 12 hours at a temperature ranging from 20 C. to 60 C., from a geopolymeric aqueous mixture comprising the following inorganic components in the following parts by dry mass: metakaolin 15-65 potassium silicate and/or sodium silicate 20-40 aggregates recycled from CDW (Construction and Demolition Waste) 5-300; said geopolymeric aqueous mixture is obtainable by mixing 20-175 parts by mass of water with said inorganic components, and has a viscosity at 23 C. between 100 and 10000 Pa.Math.s, wherein: i) the viscosity is measured via Brookfield methodology, ii) the aggregates recycled from CDW belong to one or more of the classes 17.01.01, 17.01.02, 17.01.03, 17.01.07 according to the European Waste Catalogue, iii) the aggregates recycled from CDW have a grain size less than or equal to 4 mm, preferably less than or equal to 2 mm.

The provided is an applicability regulation method for cement-based materials including: obtaining respectively Rockwell hardnesses and equivalent lengths of each phase in cement-based materials; determining effective hardnesses of the cement-based materials through weighted calculation; measuring Rockwell hardnesses of non-rigid projectiles as effective hardnesses; calculating the effective hardnesses of the non-rigid projectiles and relative hardnesses of the cement-based materials; establishing relationship curves between penetration resistances and the relative hardnesses, as well as between projectile deformation degrees and the relative hardnesses by measuring penetration resistance and a projectile deformation degree for various cement-based material and non-rigid projectile combinations with different relative hardness; confirming a relative hardness application value, and calculating an effective hardness application value of the cement-based material based on the effective hardness of the non-rigid projectile; and regulating a volume ratio of each phase of the cement-based material to make the effective hardness consistent with the effective hardness application value.

A thermosetting three-part epoxy grout composition includes: a resin comprising at least 20 wt. % resorcinol diglycidyl ether, a liquid curing agent, and a dry particulate filler comprising particles having a blend of particle sizes and amounting to at least 70% of the combined volume of the particulate filler, the resin, and the hardener. The polymer grout has a compressive strength at 28 days of at least 25,000 psi. The inventive compositions are particularly suitable as transition structures in foundations for wind towers and other constructions.