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Functionally graded cement-based composite reinforced with nanomaterials and preparation method thereof

A technology of composite materials and nanomaterials, which is applied in the field of functionally graded cement-based composite materials and their preparation, can solve the problems of limited application range, single function, and poor durability, and achieve simplified production processes, wide sources, and multiple performance improvements. Effect

Active Publication Date: 2019-06-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cement-based materials have their own defects such as heavy weight, poor durability, high brittleness and low toughness, single function, and environmental protection issues, which largely limit their application range.

Method used

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  • Functionally graded cement-based composite reinforced with nanomaterials and preparation method thereof
  • Functionally graded cement-based composite reinforced with nanomaterials and preparation method thereof
  • Functionally graded cement-based composite reinforced with nanomaterials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, the preparation of high-strength coarse aggregate concrete: Weigh 7.8% of Portland cement, 7.9% of industrial waste residue (silica fume: slag = 2:3), and 18.8% fine aggregate (yellow sand) into a mixer for dry mixing ; Mix 0.23% superplasticizer, 0.0062% defoamer and 3.1% water; then weigh 0.25% nano-SiO 2 Add it into the mixture, place it in an ultrasonic disperser for ultrasonic treatment; after ultrasonic treatment for 4-6 minutes, pour the mixture into the mixer and stir for 5-10 minutes to make the solid powder into a viscous slurry; then weigh 62.2 % of alumina ceramic balls (the above are mass percentages) as coarse aggregate, first pour a thin layer of the above-mentioned viscous slurry at the bottom of the mold, and then densely pile a layer of coarse aggregate on the slurry, and then place it on the coarse Pour a thin layer of slurry into the aggregate, it is best to completely cover the coarse bone lining, and vibrate to promote compaction, a...

Embodiment 2

[0032] The first step, the preparation of high-strength mortar: Weigh 19.6% of Portland cement, 20.1% of industrial waste residue (silica fume: slag = 2:3), and 49.8% of fine aggregate (yellow sand) into a mixer for dry mixing; mix 0.65 % water reducer, 0.0035% defoamer and 9.02% water; then weigh 0.27% of nano-SiO 2 (The above are all percentages by mass) added to the mixture, placed in an ultrasonic disperser for ultrasonic treatment; after ultrasonic treatment for 4-6 minutes, pour the mixture into the mixer and stir for 5-10 minutes to make the solid powder viscous slurry.

[0033] The second step, the preparation of fiber-reinforced ultra-high performance concrete: weigh 21.4% of Portland cement, 21.2% of industrial waste (silica fume: slag = 2:3), 41.3% fine aggregate (yellow sand) and put them into the mixer Dry mixing; mix 0.43% water reducer, 0.015% defoamer and 8.2% water; then weigh 0.19% nano-SiO 2Add it into the mixture, place it in an ultrasonic disperser for u...

Embodiment 3

[0036] The first step, the preparation of high-strength coarse aggregate concrete: Weigh 9.2% of Portland cement, 9.0% of industrial waste residue (silica fume: slag = 2:3), and put 17.3% of yellow sand into the mixer for dry mixing; reduce 0.14% Water agent, 0.0066% defoamer and 3.8% water are mixed; then weigh 0.15% nano-SiO 2 Add it into the mixture, place it in an ultrasonic disperser for ultrasonic treatment; after ultrasonic treatment for 4-6 minutes, pour the mixture into the mixer and stir for 5-10 minutes to make the solid powder into a viscous slurry; then weigh 60.4 % alumina ceramic balls (the above are mass percentages) as coarse aggregate. First lay a thin layer of the above-mentioned viscous slurry on the bottom of the mold, then tightly pile a layer of coarse aggregate on the viscous slurry, and then pour a layer of viscous slurry into the coarse aggregate to completely wrap the coarse bone lining. The best, and vibration promotes compaction, then repeat the a...

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Abstract

The invention discloses a functional gradient cement-based composite material enhanced by a nano material and a preparation method thereof. The composite material is composed of two or more of high-strength mortar, high-strength crude aggregate concrete, the fiber-enhanced super-high performance concrete, and the fiber-enhanced crude aggregate concrete according to isopyknic ratio. The nano material is doped into the composite material, an aperture and a gap of a gelling system can be filled with the material taken as a micro aggregate, the hydration rate at an early stage of cement paste is increased; at the same time, the gradient design is employed, by aiming at out-phase in the composite material and an interface in a functional zone, the performance of the cement-based composite material is effectively improved, and the functional gradient cement-based composite material is prepared, and the performances of intensity, toughness, impact resistance, penetration resistance, and blast resistance are greatly increased.

Description

technical field [0001] The invention relates to a functionally graded cement-based composite material and a preparation method thereof, in particular to an ultra-high-performance functionally graded cement-based composite material reinforced with nanometer materials. Background technique [0002] Cement-based materials have their own defects such as heavy weight, poor durability, high brittleness and low toughness, single function, and environmental protection problems, which largely limit their application range. These defects of cement-based materials are largely due to the internal heterogeneous phases and a large number of interface weak areas in different functional intervals. If these interfacial weak zones can be reduced or eliminated, the performance of cement-based composites can be significantly improved. Aiming at the interface problem between different phases inside the composite material, it is proposed to apply the concept of gradient function to cement-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00413C04B2201/50C04B18/146C04B18/141C04B14/06C04B2103/302C04B2103/50C04B14/062
Inventor 陈婷赖建中郑晓博杨浩若王强
Owner NANJING UNIV OF SCI & TECH
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