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A kind of weighted anti-radiation cement for nuclear power engineering

A technology for nuclear power engineering and radiation protection, applied in cement production, etc., can solve problems such as waste of materials, increase in concrete thickness, heat of hydration and strength that cannot meet the requirements, etc., and achieve the effect of wide range and high strength

Active Publication Date: 2018-08-24
葛洲坝石门特种水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The radiation protection method commonly used at present is to use general-purpose cement to add some heavy aggregates of iron ore and barite or materials containing light elements such as lithium and boron that have radiation protection capabilities to concrete aggregates. The radiation ability is far below the level of concrete made of radiation-proof cement. At the same time, because its hydration heat and strength cannot meet the requirements, it will cause concrete cracking and poor durability.
Even in order to achieve the purpose of radiation protection, the thickness of concrete is increased, resulting in waste of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The raw material ingredients of nuclear power cement should be adhered to to reduce C in clinker 3 S and C 3 A content, increase C 2 S (C 2 S: 25.0%-40%) and C 4 For the purpose of AF content, reducing heat of hydration and maintaining reasonable expansion, the selected scheme is saturation ratio KH=0.873, silicon rate n=2.81, aluminum rate p=0.75. There are four components in the raw meal formula: limestone, silica sand, aluminum material, and iron material; after these four components are mixed in a certain proportion, each chemical composition is guaranteed to be SiO 2 :15.42%, Al 2 o 3 :2.35%, Fe 2 o 3 : 3.13%, CaO: 42.69%, MgO: 1.09%, SO 3 : 0.31%, R 2 0: 0.37%.

[0025] 2. The calcination of nuclear power cement clinker needs to consider the characteristics of low saturation ratio, high silicon rate and low aluminum rate, and adopt the method of "fast kiln thin material, low temperature firing, fast burning and fast cooling". Specifically, limestone,...

Embodiment 2

[0028] 1. The raw material batching scheme of nuclear power cement clinker is as embodiment one.

[0029] 2. Calcination and firing of nuclear power cement clinker to produce clinker chemical composition and mineral components as in Example 1.

[0030] 3. The weighted anti-radiation cement used in nuclear power projects consists of the following components in mass percentage: nuclear power cement clinker 70.0%, barite 18.0%, iron powder 4.5%, gypsum powder 3.0%, borax 2.9%, silica fume 1.5% %, lithium chloride 0.1%. Mix the above raw materials evenly and finely grind until the specific surface area is 300m 2 / kg-350m 2 / kg, that is, the weighted radiation-proof cement used in the nuclear power project, its main technical performance index is: the dry ash density is 3.55g / cm 3 ; Specific surface area 331m 2 / kg; heat of hydration 3d: 171KJ / Kg, 7d: 197KJ / Kg; dry shrinkage rate 7d: 0.040%, 28d: 0.078%; compressive strength 3d: 18.1MPa, 28d: 52.8MPa, 90d: 63.7MPa, 180d : 74.4M...

Embodiment 3

[0032] 1. The raw material batching scheme of nuclear power cement clinker is as embodiment one.

[0033] 2. Calcination and firing of nuclear power cement clinker to produce clinker chemical composition and mineral components as in Example 1.

[0034] 3. Nuclear power projects are made of weighted anti-radiation cement, which is composed of the following components in mass percentage: nuclear power cement clinker 78%, barite 10.8%, iron powder 4%, gypsum powder 2.8%, borax 2.8% , silica fume 1.5%, lithium chloride 0.1%. Mix the above raw materials evenly and finely grind until the specific surface area is 300m 2 / kg-350m 2 / kg, that is, the weighted radiation-proof cement used in the nuclear power project. Its main technical performance indicators are: the dry ash density is 3.45g / cm 3 ; Specific surface area 328m 2 / kg; heat of hydration 3d: 185KJ / Kg, 7d: 209KJ / Kg; dry shrinkage rate 7d: 0.037%, 28d: 0.075%; compressive strength 3d: 19.4MPa, 28d: 54.4MPa, 90d: 65.9MPa, ...

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Abstract

The invention discloses a weight-increasing anti-radiation cement for nuclear power project. The weight-increasing anti-radiation cement is prepared from, by mass, 70-80% of nuclear power cement clinker, 10-20% of barite, 3-5% of iron ore powder, 2.0-4.0% of gypsum, 2.0-6.0% of borax, 1.0-3.0% of silica fume, and 0.08-0.2% of lithium chloride, wherein unprocessed material ingredients with saturated ratio KH=0.870+ / -0.02, silica ratio n=2.75+ / -0.1 and aluminum ratio P=0.7+ / -0.1 are calcined to obtain the nuclear power cement clinker. The weight-increasing anti-radiation cement for nuclear power project has the performances of being low in hydration heat, low in dry shrinkage rate, high in density and high in strength, moreover, can effectively shield the alpha ray, beta ray, gamma ray, X ray and neutron ray.

Description

technical field [0001] The invention relates to a weighted anti-radiation cement used in nuclear power engineering, which belongs to the field of special cement preparation. Background technique [0002] Cement used in nuclear power projects and other radiation protection projects has the characteristics of low heat of hydration, high strength, small drying shrinkage, and radiation protection. Therefore, it is not only necessary to meet the hydration heat standard of medium-heat cement, but also to meet the dry shrinkage requirements of road cement, the strength requirements of Portland cement, and the special needs of the project itself. To meet the requirements of different technical indicators of multiple varieties of cement at the same time, the range of indicators is narrow, the production is difficult, and nuclear radiation protection is also required. [0003] The nuclear radiation mainly includes α, β, γ, X-rays and neutron rays. Among these rays, α and β rays have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/22C04B7/21
CPCC04B7/21C04B7/22Y02P40/10
Inventor 覃爱平李昌清程海平侯益红
Owner 葛洲坝石门特种水泥有限公司
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