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Composite admixture modified cement-stabilized gangue mixture and preparation method thereof

A composite admixture and cement stabilization technology, applied in the field of road engineering materials, can solve problems such as poor durability of pavement base shrinkage cracking, and achieve the effects of improving erosion resistance, good water stability, and improving crack resistance.

Inactive Publication Date: 2019-01-11
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a novel modified cement-stabilized coal-gangue mixture and its preparation method, while ensuring the road performance of the cement-stabilized coal-gangue mixture, it can solve the problem of serious shrinkage and cracking of the pavement base in the prior art. Technical issues with poor durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: A composite admixture modified cement-stabilized coal gangue mixture, made of the following raw materials in parts by weight: 55 parts of coal gangue coarse aggregate, 45 parts of coal gangue fine aggregate, 5 parts of cement, silicon aluminum 13 parts of fly ash, 0.03 parts of polypropylene fiber, 0.03 part of polyvinyl alcohol fiber, and 0.15 part of nano-silica.

[0026] Among them, the coal gangue aggregate gradation meets the C-B-2 gradation requirements of the "Technical Rules for Road Pavement Base Construction" (JTG / T F20-2015), and the specific particle size range is shown in Table 1; SiO in silicon-aluminum fly ash 2 、Al 2 o 3 and Fe 2 o 3 Total content ≥ 70%, loss on ignition 2 / g, the particle size range of silicon aluminum fly ash is 0.3mm sieve hole pass rate ≥ 90%, 0.075mm sieve hole pass rate ≥ 70%; polypropylene fiber monofilament specific gravity 0.90~0.95, length 9~12mm, diameter 0.030~ 0.045mm, tensile strength > 450Mpa; polyvinyl a...

Embodiment 2

[0033] Embodiment 2: Except for the following content, it is basically the same as Embodiment 1. The composite admixture modified cement stabilized coal gangue mixture is made of the following raw materials in parts by weight: 55 parts of coal gangue coarse aggregate, 45 parts of coal gangue fine aggregate, 6 parts of cement, 15 parts of silicon aluminum fly ash, 0.04 parts of polypropylene fibers, 0.04 parts of polyvinyl alcohol fibers, and 0.18 parts of nano silicon dioxide.

Embodiment 3

[0034] Embodiment 3: Except for the following content, it is basically the same as Embodiment 1. The composite admixture modified cement stabilized coal gangue mixture is made of the following raw materials in parts by weight: 60 parts of coal gangue coarse aggregate, 40 parts of coal gangue fine aggregate, 5 parts of cement, 11 parts of silicon aluminum fly ash, 0.03 parts of polypropylene fiber, 0.03 part of basalt fiber, and 0.15 part of nano silicon dioxide.

[0035] The length of basalt is 7-10mm, the diameter is 0.014-0.025mm, and the tensile strength is >1300Mpa.

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Abstract

The invention discloses a composite admixture modified cement-stabilized gangue mixture and a preparation method thereof. The mixture is prepared from the following raw materials in parts by weight: 55-65 parts of coarse aggregates of gangue, 45-35 parts of fine aggregates of gangue, 4-6 parts of cement, 11-15 parts of coal ash, 0.02-0.04 part of crack-resistant fibers, 0.02-0.04 part of reinforced fibers and 0.12-0.18 part of improving agent. The composite admixture modified cement-stabilized gangue mixture prepared by using the preparation method disclosed by the invention is good in pavement performance, excellent in compressive strength, crack resistance and durability and significant when being applied to a high-grade road base layer; and the composite admixture modified cement-stabilized gangue mixture disclosed by the invention belongs to a non-toxic and non-corrosive composite and is wide in raw material source, low in cost, environment-friendly and energy-saving in productionprocess and high in economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a composite admixture modified cement stabilized coal gangue mixture and a preparation method thereof. Background technique [0002] The rapid development of road construction requires a large amount of stone mining. With the continuous mining of stone, the problem of resource shortage has become increasingly prominent. Applying coal gangue instead of stone to road construction can not only solve the problem of stone shortage, but also solve the problem of environmental pollution caused by the accumulation of coal gangue. Coal gangue aggregates have similar physical properties to rock aggregates, and have the advantages of good bearing capacity, good firmness, and high stability. However, because coal gangue has more voids and poor durability, the cement-stabilized coal gangue mixture can only be used on low-grade roads and cannot be used on a large scale. So...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00008C04B2201/50C04B18/12C04B18/08C04B16/0633C04B14/06C04B16/0641C04B14/4643
Inventor 陈渊召李振霞魏华戚佳飞方晓兵郭腾腾王朝辉赵旭刘科锋赵艳辉张军奇贾得来石彦龙张梦晗冯纪兵边雪伟黄飞虎张明堂
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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