Portland cement and preparation method thereof

Abstract

The invention relates to Portland cement which is prepared from the following raw materials in parts by weight: 60-70 parts of clinker, 15-19 parts of superfine slag, 5-7 parts of limestone, 5-7 partsof gypsum and 6-9 parts of admixture, wherein the admixture is prepared from silica fume, calcium methacrylate hydrate, 2,2,2-trifluoroethylamine hydrochloride and 2,2-difluoropropylamine hydrochloride. In the early stage of hydration of the Portland cement, the fluorine ions and calcium ions ionized from 2,2,2-trifluoroethylamine hydrochloride and 2,2-difluoropropylamine hydrochloride are utilized to form calcium fluoride which is crystallized more easily than calcium hydroxide, thus a large quantity of calcium ions are consumed, a double-electrode-layer structure is hard to form on the C3Ssurface, the induction period of C3S is shortened and even disappears, the hydration process is quickly accelerated, and the heat release rate is increased in the early stage of hydration. Therefore,the heat release rate of the cement in the hardening and maintaining stage fluctuates between 5% and 10%, the hardened cement has relatively small cracks, and the strength of a cement test piece is improved.

Description

technical field

[0001] The invention relates to the field of building materials, more specifically, it relates to a Portland cement and a preparation method thereof. Background technique

[0002] Cement is a powdery hydraulic inorganic gelling material, which can be mixed with water to form a slurry, which can be hardened in air or water, and can firmly bind sand, stone and other materials together. Therefore, at present, cement is usually used to bond concrete made of gravel, sand, etc. The hardened concrete not only has high strength, but also can resist fresh water or salt water erosion. Therefore, cement, as an important cementing material, is widely used in civil engineering, water conservancy, national defense and other projects.

[0003] In the process of cement hardening, first, the cement particles react with water, and the heat release rate is very fast, but due to the existence of gypsum, a passivation film will be formed on the surface of the cement particles, r...

Examples

Embodiment 1

[0023] Preparation of external ingredients: Take 1kg of 2,2,2-trifluoroethylamine hydrochloride and 0.5kg of 2,2-difluoropropylamine hydrochloride into ethyl acetate, raise the temperature of ethyl acetate to 31°C , stir evenly until it is completely dissolved, raise the temperature to 63°C for the second time to volatilize the solvent, and dry to obtain the mixture; then add 4kg of silica fume and 2kg of calcium methacrylate hydrate to the mixture, and mix evenly, Obtain the external admixture, wherein the average particle diameter of silica fume is 0.2 μm, and the specific surface area is 24m / g;

[0024] Preparation of Portland cement: Take 65kg of clinker, 17kg of ultra-fine slag, 6kg of limestone, 6kg of gypsum, and 7.5kg of external admixtures. After uniform mixing, they can be uniformly ground in a cement mill to obtain finished cement with an average particle size of 15μm. .

Embodiment 2

[0026] Preparation of external ingredients: Take 0.8kg of 2,2,2-trifluoroethylamine hydrochloride and 0.4kg of 2,2-difluoropropylamine hydrochloride into ethanol, raise the temperature of ethanol to 28°C, and stir evenly , until it is completely dissolved, the temperature is raised to 66°C for the second time to volatilize the solvent, and the mixture is obtained after drying; then, 4.8kg of silica fume and 1.6kg of calcium methacrylate hydrate are added to the mixture, and after uniform mixing, the obtained External admixture, wherein the average particle size of silica fume is 0.2 μm, and the specific surface area is 28m / g;

[0027] Preparation of Portland cement: Take 60kg of clinker, 15kg of superfine slag, 5kg of limestone, 5kg of gypsum, and 6kg of external admixtures, mix them uniformly, and grind them uniformly in a cement mill to obtain finished cement with an average particle size of 17 μm.

Embodiment 3

[0029] Preparation of external ingredients: Take 1.2kg of 2,2,2-trifluoroethylamine hydrochloride and 0.4kg of 2,2-difluoropropylamine hydrochloride into methanol, raise the temperature of methanol to 28°C, and stir evenly , until it is completely dissolved, the temperature is raised to 66°C for the second time to volatilize the solvent, and the mixture is obtained after drying; then, 3.2kg of silica fume and 2.4kg of calcium methacrylate hydrate are added to the mixture, and after uniform mixing, the obtained External admixture, wherein the average particle size of silica fume is 0.3 μm, and the specific surface area is 28m / g;

[0030] Preparation of Portland cement: Take 60kg of clinker, 19kg of ultrafine slag, 5kg of limestone, 5kg of gypsum, and 6kg of external admixtures. After uniform mixing, uniformly grind in a cement mill to obtain finished cement with an average particle size of 17μm.

technical field

[0001] The invention relates to the field of building materials, more specifically, it relates to a Portland cement and a preparation method thereof. Background technique

[0002] Cement is a powdery hydraulic inorganic gelling material, which can be mixed with water to form a slurry, which can be hardened in air or water, and can firmly bind sand, stone and other materials together. Therefore, at present, cement is usually used to bond concrete made of gravel, sand, etc. The hardened concrete not only has high strength, but also can resist fresh water or salt water erosion. Therefore, cement, as an important cementing material, is widely used in civil engineering, water conservancy, national defense and other projects.

[0003] In the process of cement hardening, first, the cement particles react with water, and the heat release rate is very fast, but due to the existence of gypsum, a passivation film will be formed on the surface of the cement particles, r...

Examples

Embodiment 1

[0023] Preparation of external ingredients: Take 1kg of 2,2,2-trifluoroethylamine hydrochloride and 0.5kg of 2,2-difluoropropylamine hydrochloride into ethyl acetate, raise the temperature of ethyl acetate to 31°C , stir evenly until it is completely dissolved, raise the temperature to 63°C for the second time to volatilize the solvent, and dry to obtain the mixture; then add 4kg of silica fume and 2kg of calcium methacrylate hydrate to the mixture, and mix evenly, Obtain the external admixture, wherein the average particle diameter of silica fume is 0.2 μm, and the specific surface area is 24m / g;

[0024] Preparation of Portland cement: Take 65kg of clinker, 17kg of ultra-fine slag, 6kg of limestone, 6kg of gypsum, and 7.5kg of external admixtures. After uniform mixing, they can be uniformly ground in a cement mill to obtain finished cement with an average particle size of 15μm. .

Embodiment 2

[0026] Preparation of external ingredients: Take 0.8kg of 2,2,2-trifluoroethylamine hydrochloride and 0.4kg of 2,2-difluoropropylamine hydrochloride into ethanol, raise the temperature of ethanol to 28°C, and stir evenly , until it is completely dissolved, the temperature is raised to 66°C for the second time to volatilize the solvent, and the mixture is obtained after drying; then, 4.8kg of silica fume and 1.6kg of calcium methacrylate hydrate are added to the mixture, and after uniform mixing, the obtained External admixture, wherein the average particle size of silica fume is 0.2 μm, and the specific surface area is 28m / g;

[0027] Preparation of Portland cement: Take 60kg of clinker, 15kg of superfine slag, 5kg of limestone, 5kg of gypsum, and 6kg of external admixtures, mix them uniformly, and grind them uniformly in a cement mill to obtain finished cement with an average particle size of 17 μm.

Embodiment 3

[0029] Preparation of external ingredients: Take 1.2kg of 2,2,2-trifluoroethylamine hydrochloride and 0.4kg of 2,2-difluoropropylamine hydrochloride into methanol, raise the temperature of methanol to 28°C, and stir evenly , until it is completely dissolved, the temperature is raised to 66°C for the second time to volatilize the solvent, and the mixture is obtained after drying; then, 3.2kg of silica fume and 2.4kg of calcium methacrylate hydrate are added to the mixture, and after uniform mixing, the obtained External admixture, wherein the average particle size of silica fume is 0.3 μm, and the specific surface area is 28m / g;

[0030] Preparation of Portland cement: Take 60kg of clinker, 19kg of ultrafine slag, 5kg of limestone, 5kg of gypsum, and 6kg of external admixtures. After uniform mixing, uniformly grind in a cement mill to obtain finished cement with an average particle size of 17μm.

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