Cement-based composite material with high-temperature resistance and superhigh performance and preparation method thereof

An ultra-high performance, composite material technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of bursting, saving cement clinker and avoiding collapse damage

Inactive Publication Date: 2011-06-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current cement concrete materials have very low strength at high temperatures, and there is a lack of systematic research on the high-temperature resistance of ultra-high-performance cement-based composite materials. To prepare an ultra-high-performance cement-based composite material that has high-temperature resistance and high concrete strength levels of great significance

Method used

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  • Cement-based composite material with high-temperature resistance and superhigh performance and preparation method thereof
  • Cement-based composite material with high-temperature resistance and superhigh performance and preparation method thereof
  • Cement-based composite material with high-temperature resistance and superhigh performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After weighing the cementitious material and aggregates according to the proportions in Table 1, dry mixing them in a concrete mixer uniformly; after weighing the fibers according to the proportions in Table 1, sprinkle them in the mixer and stir them evenly; mix the water reducing agent and water according to Table 1. After mixing evenly, pour it into the mixer and continue to stir it evenly; pour the mixture obtained after stirring evenly into a cube mold with a side length of 70.7, and vibrate it; put the molded specimen at a temperature of 20±2℃ . The relative humidity is greater than 95% in a standard curing box for 24 hours, then the mold is removed, and the specimen is cured in a standard curing box for more than 30 days. The cementitious material in Example 1 is 52.5 Portland cement, silica fume and slag micropowder with a mass ratio of 5:2:3; the aggregate is yellow sand with a particle size of less than 3 mm; the fiber is polyethylene with a length of 12 mm and...

Embodiment 2

[0034] The cement-based composite material was prepared by repeating the method of Example 1 according to the proportion of each component specified in Table 1, and then repeating the method of Example 1 to carry out the high temperature resistance test on the cement concrete specimen of this example, and the test results are listed in Table 2 . The cementitious material in Example 2 is 52.5 Portland cement, silica fume and slag micropowder with a mass ratio of 5:2:3; the aggregate is yellow sand with a particle size of less than 3 mm; the fiber is a polymer with a mass ratio of 1:12. Vinyl alcohol fiber and steel fiber, polyvinyl alcohol fiber length 12mm, diameter 39μm, steel fiber length 12mm, diameter 0.2mm, tensile strength greater than 1800MPa; water reducing agent is a polycarboxylate superplasticizer with a water reducing rate greater than 40% .

Embodiment 3

[0036] The cement-based composite material was prepared by repeating the method of Example 1 according to the proportion of each component specified in Table 1, and then repeating the method of Example 1 to carry out the high temperature resistance test on the cement concrete specimen of this example, and the test results are listed in Table 2 . The cementitious materials in Example 3 are 52.5 Portland cement, silica fume and slag micropowder with a mass ratio of 5:2:3; the aggregates are yellow sand and stones with a mass ratio of 1:1, and the particle size of the yellow sand is less than 3mm. , the stone is basalt crushed stone with a particle size of less than 16mm; the fiber is a polyvinyl alcohol fiber with a length of 12mm and a diameter of 39μm; the water reducing agent is a polycarboxylate superplasticizer with a water reducing rate greater than 40%.

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Abstract

The invention discloses a cement-based composite material with high-temperature resistance and superhigh performance and a preparation method thereof. The cement-based composite material comprises the raw materials of a gelled material, an aggregate, fibers, a water reducing agent and water, wherein the gelled material is a mixture of cement and active mineral admixture, the aggregate is yellow sand or a mixture of yellow sand and pebbles, and the fibers are organic fibers or mixtures of organic fibers and metal fibers. The cement-based composite material is produced through improvement on the basis of common concrete manufacturing, has the properties of superhigh mechanical property and high-temperature resistance, is applicable to high-temperature resistant engineering structures, and is favorable for preventing the collapse and the destruction of the construction structures in a fire disaster.

Description

technical field [0001] The invention relates to a cement-based composite material, in particular to a high-temperature-resistant and ultra-high-performance cement-based composite material and a preparation method thereof. Background technique [0002] In the case of fire and high temperature, concrete is prone to damage such as spalling, bursting, and collapse. These damages will threaten people's lives and property, cause damage to buildings, and cause economic losses. If the high temperature resistance of concrete can be improved, fire will occur. It can not only minimize the loss of people's life and property, but also provide valuable time for rescue work. [0003] A kind of heat-resistant concrete disclosed by Chinese invention patent publication number CN101712542A, comprising 8-30% by weight of cement, 50-80% of blast furnace water-quenched slag and / or aggregate composed of iron ore surrounding rock, 2-14% by weight The filling material composed of fly ash or slag po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B28/00C04B16/06
CPCC04B28/02Y02W30/91C04B14/06C04B18/08C04B18/141C04B18/146C04B20/006C04B20/008C04B40/0028C04B40/02C04B2103/0088C04B2103/302C04B14/02C04B14/48C04B16/0641C04B24/2641C04B16/06
Inventor 赖建中徐升张士华杨春梅李培培
Owner NANJING UNIV OF SCI & TECH
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