Slurry mineral admixture suitable for special-shaped member concrete, and preparation method thereof

A technology of mineral admixture and special-shaped components, which is applied in the field of building materials, can solve the problems of less than 30% comprehensive utilization rate of steel slag, no report of steel slag, difficult to wear and activation, etc., to meet the requirements of formwork removal strength and durability, reduce Pores and pockmarks, the effect of reducing surface energy

Inactive Publication Date: 2020-12-18
HUBEI UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] Steel slag is a by-product in the steelmaking process. Due to thermal history and component characteristics, steel slag is difficult to activate, low activity and potential stability problems in the utilization process. Therefore, the comprehensive utilization rate of steel slag in my country is less than 30%. At present Steel slag is mainly used in road and cement production
In terms of special-shaped components, a lightweight ceramsite concrete assembled prefabricated hollow staircase and its preparation method (CN201711006219.2) reported the use of cement, mineral powder, fly ash, fly ash ceramsite, water quenching slag, pearl sand , water, admixture and ceramsite and other materials to prepare a hollow staircase, there is no report of steel slag in this type of application field

Method used

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  • Slurry mineral admixture suitable for special-shaped member concrete, and preparation method thereof
  • Slurry mineral admixture suitable for special-shaped member concrete, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 150 parts of massive steel slag (moisture content 10%), 160 parts of slag (moisture content 8%), and crush it to a maximum particle size of 1mm through a jaw crusher. 1 Configuration function 5 parts of admixture and 150 parts of water are placed in a ball mill with a ball ratio of 10 parts with a particle size of 0.6-1.0 mm, 80 parts with a particle size of 1.0-1.7 mm, and 140 parts with a particle size of 1.7-2.5 mm. Grinding for 45 minutes, the median particle size of the obtained slurry mineral admixture is 11.5 μm, mixed with 700 parts of 425 ordinary Portland cement, 750 parts of sand, 1050 parts of crushed stone, 2 parts of polycarboxylate superplasticizer, 140 parts The concrete material was obtained by stirring with water, steamed and cured at 40°C for 8 hours, and after the formwork was removed, the standard curing (20°C, humidity 95%), its performance indicators are shown in Table 1.

Embodiment 2

[0023] Take 180 parts of massive steel slag (moisture content 15%), 200 parts of slag (moisture content 8%), and crush it to a maximum particle size of 1mm through a jaw crusher. 1.5 Configuration function 9 parts of admixture and 180 parts of water are placed in the ball mill with a ball ratio of 15 parts with a particle size of 0.6-1.0 mm, 70 parts with a particle size of 1.0-1.7 mm, and 120 parts with a particle size of 1.7-2.5 mm. Grinding for 60 minutes, the obtained slurry mineral admixture has a median particle size of 9.5 μm, and 850 parts of 425 ordinary Portland cement, 800 parts of sand, 1100 parts of gravel, 5 parts of naphthalene-based water reducer, and 250 parts of water The concrete material obtained by mixing was steamed and cured at 40°C for 8 hours, and after the formwork was removed, it was cured under standard conditions (20°C, humidity 95%), and its performance indicators are shown in Table 1.

Embodiment 3

[0025] Take 160 parts of massive steel slag (moisture content 8%), 180 parts of slag (moisture content 10%), and crush it to a maximum particle size of 1mm through a jaw crusher. 1.3 Configuration function 7 parts of admixture and 170 parts of water are placed in the ball mill with a ball ratio of 20 parts with a particle size of 0.6-1.0 mm, 120 parts with a particle size of 1.0-1.7 mm, and 160 parts with a particle size of 1.7-2.5 mm. Grinding for 50 minutes, the obtained slurry mineral admixture has a median particle size of 7 μm, which is obtained by stirring with 800 parts of 425 ordinary Portland cement, 780 parts of sand, 1080 parts of crushed stone, 3 parts of melamine water reducer and 250 parts of water. Concrete materials are cured by steam curing at 40°C for 8 hours, and after demoulding, standard curing (20°C, humidity 95%), and its performance indicators are shown in Table 1.

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Abstract

The invention discloses a slurry mineral admixture suitable for special-shaped component concrete, and a preparation method thereof, and relates to the field of building materials. 150-180 parts of steel slag, 160-200 parts of slag, 150-180 parts of water and 5-9 parts of a functional additive are put into a mill with the ball ratio of 10-20 parts of powder with the particle size of 0.6-1.0 mm, 80-120 parts of powder with the particle size of 1.0-1.7 mm and 140-160 parts of powder with the particle size of 1.7-2.5 mm, and are ground for 40-60 min to obtain the slurry mineral admixture. When being applied to a component concrete material, the slurry mineral admixture has high working performance, effectively reduces the defects of holes, pitted surfaces and the like, has the 1 d compressivestrength of 20 MPa or above, meets the mold stripping strength requirement, has the 28 d compressive strength meeting the C40 concrete requirement, and can meet the performance requirements of special-shaped members. According to the technical scheme, green development of building materials can be promoted, meanwhile, progress of the fabricated building technology is promoted, and remarkable social and environmental significance is achieved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a slurry-like mineral admixture suitable for special-shaped prefabricated concrete and a preparation method thereof. Background technique [0002] Prefabricated buildings have the advantages of energy saving, land saving, water saving, material saving and environmental protection "five savings and one environmental protection", which is in line with my country's environment-friendly and resource-saving development concept. The country and localities are actively promoting the development of prefabricated buildings, and strive to make prefabricated buildings account for 30% of new buildings in about 10 years. At present, prefabricated buildings have been widely used in housing construction, water conservancy and other industries. Concrete structures are the main building materials in my country. The efficient production of prefabricated concrete components is the basis for the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B28/04C04B40/02
CPCC04B28/04C04B40/0039C04B2201/50C04B18/142C04B18/141C04B24/122C04B2103/302C04B14/06C04B14/02C04B40/024
Inventor 李玉博张权钢贺行洋苏英方娇林张路川熊国庆秦义良曹清淳霍佳腾江波
Owner HUBEI UNIV OF TECH
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