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A low-wetting, high-durability composite Portland cement and its preparation method

A composite silicate and Portland cement technology, applied in the field of cement, can solve the problems of continuous hydration and compressive strength development of unfavorable cementitious materials, limited depth of surface coating protection, and damage to the integrity of cement paste. Achieve the effect of high resistance to sulfate corrosion, low porosity and simple preparation method

Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the protection depth of the surface coating is limited (usually less than 500 μm). Under the action of external erosion, the surface of the cement slurry will completely lose its protective effect after deterioration and cracking. The film wraps the cementitious material particles, and at the same time destroys the integrity of the cement paste, which is not conducive to the continuous hydration of the cementitious material and the development of compressive strength

Method used

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  • A low-wetting, high-durability composite Portland cement and its preparation method
  • A low-wetting, high-durability composite Portland cement and its preparation method
  • A low-wetting, high-durability composite Portland cement and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]The low-wetting, high-durability composite Portland cement in this example is mainly composed of slag, Portland cement, low-calcium fly ash and wettability modification components; the volume content of each component, each component Table 3 shows the particle size and the performance test of the low-wetting, high-durability composite Portland cement prepared in this example.

[0046] In this embodiment, the wettability modification component consists of diatomaceous earth (18%), zeolite (36%), dodecyltrimethoxysilane (40%), polypropylene glycol (molecular weight is 800) (4%) , dodecyl glucoside (2%); the technical parameters of microwave-chemical treatment compound modification are: microwave power 150W, irradiation time 4 minutes, sulfuric acid concentration 2mol / L, sulfuric acid temperature 35°C, oscillation time 60 minutes ;The technical parameters of vacuum loaded organosilane are: chamber pressure 0.1kPa, pressure maintenance time 15 minutes, inorganic porous mater...

Embodiment 2

[0050] The low-wetting, high-durability composite Portland cement in this example is mainly composed of calcined clay, Portland cement, low-calcium fly ash and wettability modification components; the volume content of each component, each group The particle size and performance test of the low-wetting, high-durability composite Portland cement prepared in this example are shown in Table 4.

[0051] In this embodiment, the wettability modification component consists of diatomaceous earth (22%), zeolite (30%) butyltriethoxysilane (44%), polyethylene glycol (molecular weight is 1000) (3%) , octadecyl glucoside (1%); microwave-chemical treatment compound modified technical parameters are: sulfuric acid concentration 3mol / L, sulfuric acid temperature 40 ℃, oscillation time 60 minutes, microwave power is 200W, irradiation time is 3 minutes; the technical parameters of vacuum loading organosilane are: chamber pressure 0.1kPa, pressure maintenance time 15 minutes, inorganic porous ma...

Embodiment 3

[0055] In this example, the low-wetting and high-durability composite Portland cement is mainly composed of slag, Portland cement, limestone and wettability modification components; the volume content of each component, the particle size of each component and The performance tests of the low-wetting, high-durability composite Portland cement prepared in this example are shown in Table 5.

[0056] In this embodiment, the wettability modification component consists of diatomite (20%), zeolite (27%), octadecyltrimethoxysilane (47%), polyvinyl alcohol (molecular weight is 800) (5 %), glyceryl laurate (1%); the technical parameters of microwave-chemical treatment compound modification are: sulfuric acid concentration 4mol / L, sulfuric acid temperature 40 ℃, oscillation time 30 minutes, microwave power is 200W, irradiation time is 2 minutes; the technical parameters of vacuum loading organosilane are: chamber pressure 0.1kPa, pressure maintenance time 15 minutes, inorganic porous mat...

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Abstract

The invention belongs to the technical field of Portland cement, and discloses a low-wetting, high-durability composite Portland cement and a preparation method thereof. The low-wetting, high-durability composite Portland cement is mainly composed of the following components by mass percentage: 0.5-4% of wettability modification components, 18-35% of fine-grained high-activity auxiliary gelling materials %, Portland cement 40-55%, coarse-grained and low-activity auxiliary cementitious materials 10-25%. The invention also discloses a preparation method of the composite Portland cement. The composite Portland cement of the present invention has low wettability and high durability, such as: 28-day compressive strength of 45-55MPa, water absorption of 1-3%, surface contact angle of 95-125°, and 28-day chloride ion diffusion coefficient of 0.1 ×10 ‑12 ~0.5×10 ‑12 m 2 / s, the sulfate corrosion resistance coefficient is 1.1~1.2.

Description

technical field [0001] The invention belongs to the technical field of cement, and in particular relates to a low-wetting, high-durability composite Portland cement and a preparation method thereof. Background technique [0002] In saline-alkaline areas or marine environments, the durability of cement-based materials is very prominent, and the service life of building structures is difficult to achieve the expected goals. There are a large number of corrosive media such as chloride ions, sulfate ions, and magnesium ions in saline-alkali soil or seawater. When the corrosive media migrate to the interior of the cement-based material, they react with cement hydration products to form expansive products, which cause corrosion of steel bars and cause steel bars to cling. Force reduction and structural cracking failure, causing serious durability problems. [0003] When the external aggressive medium migrates, water must be used as the carrier, and the connected pores are used as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/04C04B14/08C04B24/42C04B111/24
CPCC04B28/04C04B14/047C04B14/08C04B24/42C04B2201/50C04B2111/24C04B18/141C04B14/10C04B18/248C04B18/08C04B18/142C04B18/144C04B18/12C04B14/28C04B24/2623C04B24/32C04B24/10C04B24/06C04B24/003C04B24/20
Inventor 郭奕群张同生杜俊朋李嘉豪王洪泰韦江雄余其俊
Owner SOUTH CHINA UNIV OF TECH
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