Ultra-high-performance concrete for use in high-cold area and preparation method thereof

An ultra-high-performance concrete technology, which is applied in the field of building materials, can solve problems such as loss of strength, affect the service life of concrete, and restrict the application of ultra-high concrete, and achieve high density, excellent mechanical properties, and excellent resistance to chloride ion penetration. Effect

Active Publication Date: 2019-12-31
ANHUI CONCH DESIGN & RES INST OF BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallized water inside the concrete freezes and expands under low temperature conditions, destroying the microstructure of the concrete, causing it to lose its strength, and seriously affecting the service life of the concrete
The low-temperature alpine region restricts the application of ultra-high concrete

Method used

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  • Ultra-high-performance concrete for use in high-cold area and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for preparing ultra-high performance concrete applied in alpine regions, comprising the following steps:

[0046] 1) Weigh 200g of early-strength polycarboxylate superplasticizer, 50g of water-reducing polycarboxylate high-performance water-reducer, 50g of melamine-type water-reducer, 0.15g of defoamer and 199.85g of water, stir and mix well , as a water reducing agent, spare.

[0047] 2), the concrete mixing volume is 15L. Weigh Portland cement P.Ⅰ52.5 grade 9.75kg, high aluminate cement 52.5 grade 3.45kg, silica fume 0.75kg, nano silicon dioxide 0.15kg, sand 18.75kg, steel fiber 0.525kg, step 1) preparation Water reducer 0.42kg, sodium nitrite 0.075kg, sodium silicate 0.03kg and water 2.775kg, spare.

[0048] 3), add the Portland cement, high aluminate cement, silica fume, nano-silica, sand, sodium nitrite, and sodium silicate weighed in step 2) into the stirring pot and stir for 60 seconds, then stir while stirring Add the weighed steel fiber, the steel f...

Embodiment 2

[0052] A method for preparing ultra-high performance concrete applied in alpine regions, comprising the following steps:

[0053] 1) Weigh 210g of early-strength polycarboxylate superplasticizer, 140g of water-reducing polycarboxylate high-performance water-reducer, 105g of melamine-type water-reducer, 0.35g of defoamer and 244.65g of water, stir and mix , as a water reducing agent, spare.

[0054] 2), the concrete mixing volume is 15L. Weigh Portland cement P.Ⅱ52.5 grade 8.25kg, high aluminate cement 52.5 grade 5.1kg, silica fume 1.05kg, nano silicon dioxide 0.675kg, sand 16.5kg, steel fiber 1.18kg, step 1) preparation 0.6kg of superplasticizer, 0.135kg of sodium nitrite, 0.015kg of sodium silicate, 0.0075kg of sodium thiocyanate, and 2.85kg of water for spare use.

[0055] 3) Add the Portland cement, peraluminate cement, silica fume, nano-silica, sand, sodium nitrite, sodium silicate and sodium thiocyanate weighed in step 2) into the stirring pot and stir for 60s , and th...

Embodiment 3

[0059] A method for preparing ultra-high performance concrete applied in alpine regions, comprising the following steps:

[0060] 1) Weigh 80g of early-strength polycarboxylate superplasticizer, 140g of water-reducing polycarboxylate high-performance water-reducer, 20g of melamine-type water-reducer, 0.32g of defoamer and 159.68g of water, stir and mix , as a water reducer, for standby;

[0061] 2), the concrete mixing volume is 15L. Weigh Portland cement P.Ⅱ52.5 grade 6.975kg, high aluminate cement 62.5 grade 6.525kg, silica fume 1.0kg, nano silicon dioxide 0.3kg, sand 17.25kg, steel fiber 2.355kg, step 1) preparation 0.375kg of superplasticizer, 0.045kg of sodium nitrate, 0.03kg of sodium thiocyanate, and 2.7kg of water are used for standby.

[0062] 3) Add the Portland cement, high aluminate cement, silica fume, nano-silica, sand, sodium nitrate and sodium thiocyanate weighed in step 2) into the stirring pot and stir for 60 seconds, then add while stirring Step 2) The st...

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Abstract

The invention provides an ultra-high-performance concrete for use in a high-cold area and a preparation method thereof. The ultra-high-performance concrete comprises the following raw materials in parts by weight: 450-650 parts of Portland cement, 200-450 parts of high aluminate cement, 50-100 parts of silica fume, 5-50 parts of nano-silica, 1000-1300 parts of sand, 35-200 parts of steel fiber, 20-45 parts of water reducer, 2-10 parts of antifreezing agent, 0.2-2.0 parts of early strength agent, and 180-210 parts of water. Compared with the prior art, the ultra-high-performance concrete for use in a high-cold area provided in the invention can be used for construction in a high-cold area at -20 DEG C, and can gain strength rapidly. Moreover, the concrete is high in compactness, and has excellent anti-chlorine ion permeation performance and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high-performance concrete applied in an alpine region and a preparation method thereof. Background technique [0002] Ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), as a new type of cement-based structural material, has excellent properties such as ultra-high strength, high durability, and high toughness. Ultra-high performance concrete has achieved a great leap forward in engineering materials, and it is also the most innovative cement-based engineering material in the past three decades. [0003] However, there is no report on the use of ultra-high performance concrete in the cold region of -20°C. This is mainly because the hydration rate of concrete decreases rapidly under low temperature conditions, and the strength increases very slowly, or even stops growing. Under low temperature conditions, the crystalline wa...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B111/76
CPCC04B28/06C04B2111/76C04B7/02C04B18/146C04B14/062C04B14/06C04B14/48C04B2103/302C04B22/002C04B2103/50C04B22/085C04B12/04C04B14/068C04B22/14
Inventor 肖慧丽沈江平徐文祥谢发权熊磊陈钦松王一健恽进进叶书峰
Owner ANHUI CONCH DESIGN & RES INST OF BUILDING MATERIALS CO LTD
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