Phosphoric acid flyash cement and its preparing method

A technology of fly ash cement and fly ash, which is applied in the field of cement, can solve the problems of low strength, can only be used for road engineering materials, wall materials, slow excitation speed, etc. fast effect

Inactive Publication Date: 2004-12-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alkali excitation only utilizes the pozzolanic properties of fly ash, so the excitation speed is slow, and in the case of no Portland cement clinker, when alkali excitation fly ash is used as the main cementitious material, its strength is low, usually It can only be used for road engineering materials, wall materials, etc., and cannot be widely used like ordinary cement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is a comparison of the compressive strength of phosphoric acid fly ash cement, alkali-activated fly ash, and ordinary Portland cement.

[0026] The phosphoric acid fly ash cement of the present embodiment is mainly made up of fly ash, phosphoric acid activator, water and sodium tetraborate retarder, and the percentage by weight of its mixing ratio is: fly ash 70.4, phosphoric acid activator 11.3, water 16.9, Sodium tetraborate retarder 1.4. Its preparation method and steps are as follows:

[0027] (1) material preparation

[0028] Firstly, each component is weighed and prepared according to the percentage weight of the above-mentioned mixing ratio of phosphoric acid fly ash cement;

[0029] (2) Pour the fly ash into the container

[0030] Then pour the fly ash into the forming container;

[0031] (3) Preparation of phosphoric acid aqueous solution

[0032] Then use another container to mix phosphoric acid and water and stir evenly to prepare phosphoric...

Embodiment 2

[0037] This example is a comparison of the bond strength between phosphoric acid fly ash cement and ordinary Portland cement.

[0038] (1) With the same component, proportioning and preparation method steps as in Example 1, phosphoric acid fly ash cement is prepared, and then the old concrete specimen is broken, and it is bonded with this phosphoric acid fly ash cement, bonding The thickness is 10mm.

[0039] (2) Ordinary Portland cement 42.5 is made into ordinary Portland cement slurry with a water-cement ratio of 0.3, and the old concrete specimens with the same structure and thickness are broken and bonded with ordinary Portland cement slurry. The bond thickness is still 10mm.

[0040]

[0041] From the comparison results, it can be seen that the bonded flexural strength of the phosphoric acid fly ash cement of the present invention is higher than that of ordinary portland cement at all ages.

Embodiment 3

[0043] This example is the effect of retarder on the setting time of phosphoric acid fly ash cement.

[0044] The phosphoric acid fly ash cement of this embodiment is mainly composed of fly ash, acid activator, water and retarder. The acid activator is phosphoric acid, and the retarder is sodium tetraborate. The weight ratio of fly ash, phosphoric acid and water is 10.0:1.6:2.4, and the mixed sodium tetraborate is 2%, 5% and 10% of the weight of fly ash respectively. Its preparation method steps are as follows:

[0045] (1) material preparation

[0046] First weigh the fly ash, phosphoric acid and water according to the weight ratio of 10.0:1.6:2.4, prepare the materials, then weigh the sodium tetraborate according to 2%, 5% and 10% of the weight of the fly ash, get ready;

[0047] (2) Pour the fly ash into the container

[0048] Then pour the fly ash into the forming container;

[0049] (3) Preparation of phosphoric acid aqueous solution

[0050] Then use another conta...

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Abstract

The present invention belongs to the field of cement technology. The cement of the present invention consists of flyash 50-80 wt%, acid excitant 7-28 wt%, water 1-26 wt% and retardant 1-10 wt%. Or, it consists of flyash after being retarding pre-treated flyash 50-80 wt%, acid excitant 4-30 wt% and water 1-30 wt%. It has the features of fast coagulation, high strength, etc., and may be used widely in fast repair engineering, and building engineering under low temperature environment, etc. The present invention has obvious environment protecting effect.

Description

technical field [0001] The invention belongs to the technical field of cement, in particular to fly ash cement and a preparation method thereof. Background technique [0002] Fly ash is the industrial waste discharged from coal-fired power plants after being burned in boilers. It not only pollutes the environment, but also occupies land for stacking. From the perspective of chemical composition, fly ash is a typical pozzolanic material, which contains a large amount of aluminosilicate glass body, its structure is dense, and its chemical properties are stable. Fly ash has potential pozzolanic activity, but the activity is very slow. The so-called pozzolanic activity refers to the property that the siliceous or aluminosilicate material in the fly ash combines with CaO to form a hydraulic solid in the presence of water. Therefore, if the activity of fly ash is stimulated and its potential activity is fully exerted, so that it can quickly produce hydraulic gelling properties a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/06C04B18/08C04B22/08C04B22/16C04B28/02C04B28/34
CPCC04B28/34C04B28/021Y02W30/91C04B18/08C04B22/165C04B2103/20
Inventor 钱觉时王智唐祖全梁郁
Owner CHONGQING UNIV
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