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A kind of ferronickel slag ultra-high strength concrete and preparation method thereof

A technology of ultra-high-strength concrete and nickel-iron slag, which is applied in the field of nickel-iron-iron slag ultra-high-strength concrete and its preparation, can solve the problems of inability to increase fluidity, poor concrete fluidity, and low cement hydration rate, and slow down excessive consumption , smooth surface, and the effect of reducing the amount of cement

Inactive Publication Date: 2018-03-30
徐州经济技术开发区诚意商品混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Difficulties in the preparation of ultra-high-strength concrete: large amount of cement, high cost, low cement hydration rate, acting as micro-aggregate, waste of resources; low water-cement ratio, poor concrete fluidity, and even can not be poured; high-efficiency water reducer has a saturation point, Increasing the dosage beyond the saturation point will not only fail to increase the fluidity, but also greatly increase the cost

Method used

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  • A kind of ferronickel slag ultra-high strength concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition and mass percentage of each raw material are as follows: the cementitious material is P.O 52.5 Portland cement 50% (dosage 348kg / m 3 ); mineral powder 15% (amount 104kg / m 3 ); silica fume 5% (35kg / m 3 ); superfine powder of ferronickel slag 30% (dosage 209kg / m 3 ); the fine aggregate is nickel-iron sand crushed through a 4.75mm sieve (amount of 867kg / m 3 ); the coarse aggregate is 5~20mm graded ferronickel slag (dosage 951kg / m 3 ); water (amount 163kg / m 3 ); high-efficiency polycarboxylate superplasticizer (dosage 20kg / m 3 ).

[0037] The preparation method includes: crushing, sieving, grinding process, weighing ingredients and mixing process, and the specific method process is as follows:

[0038] (1) Crushing, screening, and grinding process: Crushing ferronickel slag until the maximum particle size is less than 20mm, sieving and classifying. Those with a particle size of 5-20 mm are directly used as coarse aggregates; those with a particle size...

Embodiment 2

[0042] The composition and mass percentage of each raw material are as follows: the cementitious material is P.O 52.5 Portland cement 60% (amount of 418kg / m 3 ); mineral powder 15% (amount 104kg / m 3 ); silica fume 5% (35kg / m 3 ); superfine powder of ferronickel slag 20% ​​(dosage 139kg / m 3 ); the fine aggregate is nickel-iron sand crushed through a 4.75mm sieve (amount of 867kg / m 3 ); the coarse aggregate is 5~20mm graded ferronickel slag (dosage 951kg / m 3 ); water (amount 163kg / m 3 ); high-efficiency polycarboxylate superplasticizer (dosage 20kg / m 3 ).

[0043] Others are the same as in Example 1. The workability, fluidity and compressive strength test results of the ferronickel slag ultra-high strength concrete prepared in this example are shown in Table 1.

Embodiment 3

[0045] The composition and mass percentage of each raw material are as follows: the cementitious material is P.O 52.5 Portland cement 55% (dosage 383kg / m 3 ); mineral powder 20% (amount 139kg / m 3 ); silica fume 5% (35kg / m 3 ); superfine powder of ferronickel slag 20% ​​(dosage 139kg / m 3 ); the fine aggregate is nickel-iron sand crushed through a 4.75mm sieve (amount of 867kg / m 3 ); the coarse aggregate is 5~20mm graded ferronickel slag (dosage 951kg / m 3 ); water (amount 163kg / m 3 ); high-efficiency polycarboxylate superplasticizer (dosage 20kg / m 3 ).

[0046] Others are the same as in Example 1. The workability, fluidity and compressive strength test results of the ferronickel slag ultra-high strength concrete prepared in this example are shown in Table 1.

[0047] control group

[0048] At the same time, concrete was prepared with natural crushed stone, river sand and cement as a control. The composition and mass percentage of each raw material of the control group ar...

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Abstract

The invention provides a ferronickel slag ultrahigh-strength concrete and a preparation method thereof. Every cubic meter of ferronickel slag ultrahigh-strength concrete contains 550-700kg of cementing material, 900-1000kg of coarse aggregate, 800-900kg of fine aggregate, 8-20kg of polycarboxylic-acid high efficiency water reducing agent and 160-170kg of water. The cementing material is composed of the following components in percentage by mass: 50-60% of P.O 52.5 Portland cement, 15-20% of ore powder, 5% of silica fume and 20-30% of ferronickel slag micropowder. The ferronickel slag is used as crude aggregate, fine aggregate and a mineral admixture respectively instead of natural gravel, sand and part of cement. Besides, the ferronickel slag has favorable water-reducing actions, can greatly improve the placeability of concrete, and obviously increases the slump constant. The 25-day compression strength of the ferronickel slag ultrahigh-strength concrete can reach 110 MPa or above, which is much higher than the non-ferronickel-slag concrete.

Description

technical field [0001] The invention relates to a nickel-iron slag ultra-high-strength concrete and a preparation method thereof, belonging to the technical field of comprehensive utilization of nonferrous metallurgical waste slag resources. Background technique [0002] Nickel-iron slag is the slag discharged from the steelmaking plant that produces nickel-iron alloy (mainly used in the production of stainless steel) with laterite ore as the main raw material. my country produces about 10 million tons of ferroalloy slag every year, and it continues to increase at a rate of about 8 million tons per year. With the rapid development of global industrialization, the demand for stainless steel bearing the pace of heavy industry development is increasing. Naturally, as stainless steel production The raw material, the processing of a large amount of slag brought by ferronickel alloy has aroused widespread concern in the whole society. Stockpiling will take up more and more land, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08
CPCC04B28/085C04B18/144C04B18/142C04B24/24
Inventor 曹永曹辉黄玉楼刘强武鹏飞欧大康刘海明许珊珊
Owner 徐州经济技术开发区诚意商品混凝土有限公司
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