Pulpy metakaolin-base concrete admixture, and preparation method and application of admixture

A metakaolin and admixture technology, which is applied in the field of slurry metakaolin-based concrete admixture and its preparation, can solve the problems that metakaolin cannot be uniformly dispersed, the fluidity and slump are reduced, and the surface energy is high, so as to improve the Volume stability and durability, improved interfacial transition zone, improved effect of improved effect

Inactive Publication Date: 2017-08-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size of metakaolin (mainly distributed between 1 and 10 μm), high surface energy, and a layer-like shape, metakaolin particles are prone to agglomeration
Used as an admixture in cement and concrete, when the agglomerated metakaolin powder is mixed, it is easy to absorb a large amount of water to form a flocculation structure...

Method used

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  • Pulpy metakaolin-base concrete admixture, and preparation method and application of admixture
  • Pulpy metakaolin-base concrete admixture, and preparation method and application of admixture
  • Pulpy metakaolin-base concrete admixture, and preparation method and application of admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The admixture that this embodiment provides comprises dry basis, composite dispersant and water; Dry basis is made up of metakaolin and fly ash sedimentation beads, and its quality is respectively 60g and 40g, and the quality of water is 100g, hydroxyethyl cellulose The mass is 0.05g, and the naphthalene-based water reducer is 0.01g. The specific ratio is shown in Table 1. In this embodiment, the naphthalene-based water reducer is powdered sodium dinaphthylmethane disulfonate.

[0028] The preparation method of the admixture provided in this example is as follows: mix 60 g of metakaolin and 40 g of fly ash pellets and stir for 5 to 10 minutes, then dissolve the composite dispersant hydroxyethyl cellulose dissolved in 100 g of water and naphthalene-based reducing The water agent is added to the powder, and the stirring is continued for 25 to 35 minutes to obtain the slurry-like metakaolin-based concrete admixture.

Embodiment 2

[0052] Put the selected two groups of powder metakaolin and fly ash pellets into the mixer according to the mass of 100g each time, and carry out premixing for 5-10 minutes each time; put the selected dispersant into the weighed water completely Dissolve, then pour into one of the mixtures of one group, and continue to stir for 25-35 minutes to obtain the dispersed slurry-like metakaolin-based concrete admixture slurry B, and the other group of mixtures Add weighed water and stir for 25-35 minutes to obtain undispersed slurry metakaolin-based concrete admixture slurry A (as comparative example 4). For details, see Table 5.

[0053] Table 5 Mixing ratio of different slurry metakaolin-based concrete admixtures (g)

[0054] Numbering

Metakaolin

fly ash beads

Hydroxyethyl cellulose

Naphthalene superplasticizer

water

Slurry A

60

40

/

/

100

slurry B

60

40

0.05

0.01

100

[0055] Taking the mortar specimen...

Embodiment 3-5

[0063] Taking the mortar specimen as the object of investigation, according to the total mass (dry basis) of metakaolin and fly ash sinking beads, 5%, 10%, 15% and other masses were used to replace the cementitious material to prepare mortar. Select standard sand with a water-cement ratio of 0.5. The mortar mix ratio is shown in Table 8.

[0064] Table 8 Mortar mix ratio

[0065]

[0066] According to GB / T 2429-2005 " cement mortar fluidity test method " test the fluidity of reference sample, the mixture of embodiment 3-5; According to GB / T 17671-1999 " cement mortar strength test method ", use The universal compression testing machine tests the 3-day, 7-day and 28-day compressive strength of the benchmark sample and Examples 3-5.

[0067] Table 9 Fluidity of mortar and compressive strength of test block

[0068]

[0069] Table 9 illustrates: embodiment 3-5 pulpy metakaolin-based concrete admixture dosage is that metakaolin and fly ash sinking pearls account for 5%, 1...

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Abstract

The invention provides a pulpy metakaolin-base concrete admixture and a preparation method of the admixture. The admixture comprises a dry base, a composite dispersant and water, wherein the dry base consists of 30-90% by mass percentage of metakaolin and 10-70% by mass percentage of fly ash sinking beads; a mass ratio of the water to the dry base is (30-180):100; the composite dispersant consists of hydroxyethyl cellulose and a naphthalene water reducing agent; the hydroxyethyl cellulose accounts for 0.005-2.0% of the mass of the dry base; the naphthalene water reducing agent accounts for 0.001-1.0% of the mass of the dry base. The admixture reduces an adverse effect of the metakaolin on the working performance of concrete by utilizing combined action of the metakaolin, the fly ash sinking beads and the dispersant, and significantly improves the strength uniformity, the dispersity and the stability of a test block.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a slurry-like metakaolin-based concrete admixture and a preparation method and application thereof. Background technique [0002] With the development and progress of human society and civilization, improving the mechanical properties and durability of concrete is an important topic that material scientists from all over the world are constantly researching and exploring. Active admixtures such as ash are an effective way to prepare high-performance concrete, and the addition of silica fume is the best. However, as a by-product of refining silicon-ferrosilicon alloy and metal silicon, silica fume has less sources and is expensive. To implement the national economic sustainable development strategy and environmental protection requirements, it is particularly important to seek an active mineral admixture that can be industrially produced. [0003] Metakaoli...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B14/10
CPCC04B40/0039C04B14/106C04B18/08C04B24/383C04B24/20
Inventor 水中和郑丽孙涛王桂明
Owner WUHAN UNIV OF TECH
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