A steam-cured cement-based material with high water absorption resistance and preparation method thereof

A cement-based material and water adsorption technology, applied in the field of building materials, can solve the problems of negative effects of mechanical properties and poor compatibility of cement-based materials

Active Publication Date: 2021-04-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the defects existing in the existing steam-cured cement-based materials, the purpose of the present invention is to provide a steam-cured cement-based material with high water absorption resistance, which is added with diatomite-coated expanded graphite and paraffin adsorbed on silicon The phase-change composite material in the pores of algal earth and expanded graphite can significantly improve the performance of steam-cured cement-based materials on the premise of solving the poor compatibility between existing phase-change materials and cement-based materials and having a significant negative effect on the mechanical properties of cement-based materials. Excellent water absorption performance, improve the durability of steam-cured cement-based materials, and enhance the structural service life of steam-cured concrete

Method used

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  • A steam-cured cement-based material with high water absorption resistance and preparation method thereof
  • A steam-cured cement-based material with high water absorption resistance and preparation method thereof
  • A steam-cured cement-based material with high water absorption resistance and preparation method thereof

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Embodiment 1

[0040] 1. Preparation of carrier D / EG for phase change composite materials

[0041] Add 1g of 200-mesh expandable graphite expanded at 900°C for 30s into 500ml of absolute ethanol for ultrasonic dispersion for 30 minutes, then add 31g of diatomite with a fineness of 120 mesh, and continue ultrasonic dispersion for 50 minutes, during which time a glass rod is also used for stirring , to obtain a new solution of D / EG mixture. The obtained new D / EG mixed solution was continuously stirred at 30°C and 1500 r / min for 60 min to obtain a D / EG mixed solution. The obtained mixed solution was cooled to room temperature after evaporating absolute ethanol at 100°C. The obtained moist solid powder D / EG was placed in an oven at 105°C and dried for 24 hours to obtain the carrier D / EG of gray powder phase change composite material. Depend on figure 1 It can be seen that diatomaceous earth and expanded graphite are evenly mixed.

[0042] 2. Preparation of phase change composite material D / E...

Embodiment 2

[0056] 1. Preparation of carrier D / EG for phase change composite materials

[0057] Add 1g of 200-mesh expandable graphite expanded at 900°C for 1min to 550ml of absolute ethanol for ultrasonic dispersion for 20min, then add 34.7g of diatomite with a fineness of 120mesh, and continue ultrasonic dispersion for 60min, during which glass rods are also used Stir to obtain a new mixed solution of D / EG. The obtained D / EG mixed solution was continuously stirred for 70 min at 30°C and 1300 r / min to obtain a D / EG mixed solution. The obtained mixed solution was cooled to room temperature after evaporating absolute ethanol at 100°C. The obtained moist solid powder D / EG was placed in an oven at 105°C and dried for 24 hours to obtain the carrier D / EG of gray powder phase change composite material.

[0058] 2. Preparation of phase change composite material D / EG / P

[0059] First, 220g of paraffin wax with a melting point of 58°C was gradually melted into a liquid at 90°C. Put 40g of D / EG...

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Abstract

The invention discloses a steam-cured cement-based material with high water absorption resistance, which is added with a phase-change composite material with diatomite-coated expanded graphite and paraffin adsorbed in the pores of the diatomite and the expanded graphite. The steam-cured cement-based material of the present invention is added with a phase-change composite material whose structure is diatomite-coated expanded graphite and paraffin is adsorbed in the pores of diatomite and expanded graphite. Under the premise of poor performance and significant negative effect on the mechanical properties of cement-based materials, it can significantly improve the water adsorption resistance of steam-cured cement-based materials, improve the durability of steam-cured cement-based materials, and enhance the structural service life of steam-cured concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a steam-cured cement-based material and a preparation method thereof, in particular to a phase added with diatomite-coated expanded graphite and paraffin adsorbed in the pores of diatomite and expanded graphite. A steam-cured cement-based material with high water absorption resistance and a preparation method thereof of variable composite material. Background technique [0002] Generally, steam curing is a technique to improve the early strength of precast concrete. Steam-cured concrete has the characteristics of high early strength, simple manufacturing process, and controllable product quality. In recent years, steam-cured concrete has been widely used to make prefabricated components of high-speed railway infrastructure, such as beams, track slabs, and sleepers. During the steam curing process, the higher temperature environment not only promotes the early hydration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B40/02C04B20/10C09K5/06C04B20/06C04B14/02C04B24/36C04B111/27
CPCC04B20/06C04B20/1066C04B28/04C04B40/024C04B2111/27C09K5/063C04B14/024C04B24/36C04B14/068C04B2103/302
Inventor 龙广成毕丽苹马聪谢友均曾晓辉
Owner CENT SOUTH UNIV
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