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Alkali-activating-agent-doped early strength super-high performance concrete and preparation method thereof

An alkali activator and ultra-high-performance technology, applied in the field of concrete, can solve the problems that restrict the large-scale production of ultra-high-performance concrete prefabricated components, long demolition time, and low early-stage strength of ultra-high-performance concrete. The effect of shortening the setting time, shortening the demoulding time, and compacting the internal structure

Active Publication Date: 2017-03-22
西安华清科教产业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing ultra-high performance concrete has low early strength and takes a long time to remove the formwork, which restricts the large-scale production of ultra-high performance concrete prefabricated components

Method used

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  • Alkali-activating-agent-doped early strength super-high performance concrete and preparation method thereof
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  • Alkali-activating-agent-doped early strength super-high performance concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Cement: Shield Stone P.O42.5 Ordinary Portland Cement; Silica Fume: Commercially available SiO 2The content (mass content) is not less than 92%; quartz powder: commercially available 325 mesh; ~0.212mm (40~70 mesh), fine quartz sand 0.212~0.125mm (70~120 mesh); steel fiber: the length of Shanghai Bekaert No. 2 Steel is 13±10% mm, and the diameter is 0.2±0.03mm Steel fiber, tensile strength ≥ 2850Mpa, density 8000kg / m 3 . Polypropylene fiber: commercially available ordinary polypropylene fiber, the length is 6mm, the diameter is 0.031mm, and the density is 920kg / m 3 , length 6mm; water reducer: polycarboxylate water reducer, water reducing efficiency is 25%; defoamer: water-soluble defoamer; alkali activator: through the water glass solution (water content (mass) Percentage) 55%) is mixed with the NaOH of purity ≥ 99% to prepare the water glass solution that modulus is 1.4. The mix ratio of ultra-high performance concrete is shown in Table 1.

[0039] Table 1 Ultra-...

Embodiment 2

[0053] Cement: Shield Stone P.O42.5 Ordinary Portland Cement; Silica Fume: Commercially available SiO 2 The content is not less than 92%; quartz powder: commercially available 325 meshes; 40~70 mesh), fine quartz sand 0.212~0.125mm (70~120 mesh); steel fiber: steel fiber with a length of 13±10% mm and a diameter of 0.2±0.03mm produced by Shanghai Bekaert No. 8000kg / m 3 . Polypropylene fiber: commercially available ordinary polypropylene fiber, length 6mm, density 920kg / m 3 Water reducer: polycarboxylate water reducer, water reducing efficiency is 25%; Defoamer: water-soluble defoamer; Alkali activator: by the water glass solution (water content (mass percentage) 55 %) mixed with NaOH with a purity ≥99%. The mix ratio of ultra-high performance concrete is shown in Table 3.

[0054] Table 3 Ultra-high performance concrete mix ratio

[0055]

[0056] Weigh each raw material according to the mixing ratio and stir, and the stirring sequence is as follows:

[0057] Pour ce...

Embodiment 3

[0067] An early-strength ultra-high-performance concrete mixed with an alkali activator. The components of the concrete include 1019 parts of cementitious material, 1140 parts of quartz sand, 205 parts of fiber, 20.38 parts of water reducing agent, and 25.6 parts of defoaming agent in parts by mass. parts, 20.38 parts of base activator and 152.85 parts of water.

[0068] Wherein, the cementitious material includes 63.7% of cement, 15.9% of silica fume and 20.4% of quartz powder in terms of mass percentage; wherein the cement is not lower than P.O42.5 Portland cement, and SiO in silica fume 2 The mass content is not less than 92%; the particle size of quartz powder is not greater than 325 mesh.

[0069] The quartz sand includes coarse quartz sand, medium quartz sand and fine quartz sand with a mass ratio of 1:0.46:0.32, wherein the particle size of the coarse quartz sand is 0.850-0.425 mm, and the particle size of the medium quartz sand is 0.425 mm. ~0.212mm, the particle size...

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Abstract

The invention discloses alkali-activating-agent-doped early strength super-high performance concrete and a preparation method thereof. The concrete comprises, by mass, 1019-1059 parts of a cementing material, 1120-1271 parts of quartz sand, 165-205 parts of fibers, 20.38-21.18 parts of a water reducing agent, 12.2-25.6 parts of a de-foaming agent, 20.38-21.18 parts of an alkali activating agent and 152.85-180.03 parts of water. Under the effect of the alkali activating agent, the cementing material contains lots of Si-O and Al-O bond rupture, SiO4 and AlO4 tetrahedrons are made to be fast dissolved out, lots of inorganic high-molecular polymers are fast formed through a polycondensation reaction, the early strength of the concrete is improved fast, and the super early strength effect is achieved. The alkali activating agent is doped in, the initial setting time of the super-high performance concrete is greatly shortened, the super-high performance concrete is made to have very high early strength, the stripping time is shortened, and the circulation efficiency of preparation of the concrete is accelerated.

Description

technical field [0001] The invention relates to concrete, in particular to an early-strength ultra-high-performance concrete mixed with an alkali activator and a preparation method thereof. Background technique [0002] Ultra high performance concrete (Ultra high performance concrete) has super high strength, excellent durability and good working performance, and its wide application will subvert the current civil engineering structure design, construction and other fields. Reactive Powder Concrete (RPC) is one of the typical representatives of ultra-high performance concrete. It is a kind of high strength, high toughness, high Cementitious composite with good durability and volume stability. At present, the commonly used raw materials for preparing reactive powder concrete include: cement, silica fume, ground quartz powder, mineral fine admixture, quartz sand and superplasticizer. [0003] At present, due to the restriction of the high-temperature curing system, reactive ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/05C04B18/146C04B14/06C04B14/48C04B16/0633C04B2103/302C04B2103/50C04B22/08C04B22/062
Inventor 陶毅张海镇史庆轩王秋维
Owner 西安华清科教产业(集团)有限公司
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