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Particulate additive for dispersing admixtures in hydraulic cements

A granular additive and hydraulic cement technology, which is applied in the field of dispersed admixtures, can solve problems such as not easy and difficult to use

Inactive Publication Date: 2005-03-16
UNIV OF WESTERN AUSTRALIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Handling such materials is often not easy in the context of the usual construction industry, making them difficult to use in concrete mixing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] In this example, a certain range of admixtures and carriers are dry-milled in a vertical ball mill using the above-mentioned preferred operating parameters to reduce the median particle size of the carrier and adjust the particle distribution to be close to normal and relatively wide. The spike is diluted and combined with the vehicle. The formed additives were analyzed by X-ray Electron Photon Spectroscopy (XPS) combined with Scanning Electron Microscopy (SEM). This indicates that the surface of the carrier particles is enriched with admixtures compared to the bulk of the carrier particles and that the admixtures are not present in a loosely dispersed form. SEM analysis showed that the assumption of uniform coating of individual carrier particles is unrealistic and that there may well be more complex situations where admixture particles would be accommodated on the surface of the agglomerate and in some cases bound to individual carrier particles. Certain additives ar...

Embodiment 2

[0079] In this example, the fine F fly ash with a median particle size of 15 microns was dry-milled in a vertical ball mill using the above-mentioned preferred operating parameters to make the additive, so that the median particle size of the fly ash was reduced to 4 Micron, and adjust the particle distribution to be close to normal and relatively broad. No admixtures are used. When the additive is used in the binder of conventional slump concrete, and maintains a slump constant of 100 mm, it increases strength while reducing water requirements. The results of this experiment are shown in Table 2.

[0080] Mixture

Concrete water%

Early strength (Mpa)

late strength

(Mpa)

340℃hrs*

(Mature)

410℃hrs*

(Mature)

480℃hrs*

(Mature)

7 days **

13% *** pulverized coal

Ash

6.8

28.5

34.75

35.0

50.75

20% additives

6.4

32.25

36.25

42.5

63.25

...

Embodiment 3

[0087] In this embodiment, the above-mentioned preferred operating parameters are used in the vertical ball mill to dry-grind F-class fine fly ash with a median particle size of 15 microns and anhydrous sodium sulfate with 1% mass to prepare additives, so that the pulverized coal The median particle size of the ash is reduced to 4 microns and the particle distribution is adjusted to be near normal and relatively broad, the admixture is diluted in the carrier and bound to the carrier particles. The ratio of sodium sulfate and fly ash has been shown in previous experiments to be higher than the optimum value for the early strength growth of the mortar.

[0088] Mortar prepared from sand, cement (median particle size 12.5 microns), additives and water (water / binder ratio 0.48, total binder content 25% by mass of the total dry mix components) The 28-day compressive strength is shown in Table 3.

[0089] Mixture

Column compressive strength of 28-day water-cured concr...

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Abstract

The invention relates to a particular additive and method for dispersing an admixture in a cementitious composition comprising a hydraulic cement, to provide activation of the admixture on mixing of the cementitious composition with water wherein the particles of the particulate additive comprise a carrier comprising pozzolanic material and an admixture bound to the particulate carrier wherein the particles of the additive have a median particle size of between one tenth and one half of the median particle size of the cement used in the cementitious composition.

Description

technical field [0001] The present invention relates generally to an additive for dispersing an admixture in hydraulic cement, to a cement composition comprising the same, and to methods and compositions for dispersing the admixture in such cement. Background technique [0002] The core components of mortar and concrete are cement or cement binders and aggregates such as sand and stone and water. Additives such as fly ash and lime are often mixed into cement binders. Admixtures such as water scavengers, air entrainers and set modifiers are often added to mortar and concrete. The usual sequence of preparation is drying, mixing of the solid components, followed by addition of the liquid components, followed by thorough mixing of the two components. In particular, start the concrete mixer, add sand and stones, followed by binder, water and any admixtures. Binder components such as cement and fly ash may be added separately. In some cases, such as when premixed concrete is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/00C04B14/28C04B18/08C04B20/10C04B22/00C04B24/00C04B28/02C04B40/00
CPCC04B40/0028C04B20/10C04B40/0042Y02W30/91C04B20/026C04B28/02C04B2103/00C04B18/08C04B2103/0088C04B7/26C04B22/00
Inventor 约翰·特里·古尔利克里斯托弗·约翰·布斯克保罗·杰勒德·麦考密克内森·杰里米·查普曼格雷戈里·鲍尔弗·约翰逊
Owner UNIV OF WESTERN AUSTRALIA
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