CN104628278A

CN104628278A - Activated volcanic ash powder and finished product thereof

Info

Publication number: CN104628278A
Application number: CN201310572221.1A
Authority: CN
Inventors: 艾正安
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-13
Filing date: 2013-11-13
Publication date: 2015-05-20

Abstract

The invention relates to activated volcanic ash powder. The activated volcanic ash powder comprises SiO2, Al2O3 and an additive, wherein mass percents of SiO2 and Al2O3 are not less than 80%, the specific area of the activated volcanic ash powder is 400-900m<2>/kg, the additive is a water reducing agent or an air entraining agent, mass percent of the water reducing agent is 0.2-1%, mass percent of the air entraining agent is 0.03-0.6%, and hydraulic concrete can be prepared according to different requirements by adopting the activated volcanic ash powder and silicate cement. The activated volcanic ash powder is taken as a mixing material and is mixed into concrete, and the original coal ash is replaced, so that regional resources can be solved, the local materials can be adopted, and ignition loss, SO3 content and carbon content of the activated volcanic ash powder are much lower than those of the coal ash.

Description

A kind of active pozzolans powder and finished product thereof

Technical field

The invention belongs to building material field, specifically relate to a kind of active pozzolans powder and finished product thereof.

Background technology

The primary solids refuse that flyash is discharged as coal-burning power plant, one of industrial residue that the current discharge capacity of Ye Shi China is larger simultaneously, along with the development of power industry, the flyash quantity discharged of coal-burning power plant increases year by year, more and more causes the attention of people.The flyash that admixture is appropriate in hydraulic engineering dam, Factory Concrete, have and increase concrete degree of compactness, raising workability of concrete and weather resistance, reduce hydration heat of concrete temperature rise, opposing concrete shrinkage crackle, save cement and fine aggregate, improve the workability of concrete mix, the pumpability of Concrete Structure, the effect reduced costs.Thus; flyash is generally adopted to expect as concrete participation in most of engineering; and by corresponding utilisation technology, as GB/T1596 " flyash in cement and concrete ", GB/T18046 " GBFS in cement and concrete ".But in the engineering lacking the industrial waste residue resource such as flyash, slag powders or build away from these resource places of production, how to make full use of region resource, reduce engineering cost.

In addition, flyash is applied in concrete as additive, and its index with reference to national standard, and as the quality parameter of the first level flour coal ash of additive is: Xu water yield Bi≤95%, Shao Shi Liang≤5%, SO ₃containing amount≤3%, containing carbon amounts≤5%; Widely popularize the prerequisite of environmental consciousness in country under, the environmental problem that coal-burning power plant brings is more outstanding, and the resource of flyash reduces relatively, and volcanic ash powder is at loss on ignition, SO ₃the aspect such as content and carbon containing amount is obviously better than flyash.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of active pozzolans powder, and this powder can replace flyash mixedly being added in concrete, its loss on ignition, SO ₃content and carbon content all lower than the every quality parameter in first level flour coal ash, have good endurance quality, and its hydration heat is low simultaneously, and have good workability, corrosion resistance is strong.

In order to solve the problems of the technologies described above, the present invention realizes in the following manner:

A kind of active pozzolans powder, comprises SiO ₂, Al ₂o ₃and admixture, described SiO ₂and Al ₂o ₃mass percent be not less than 80%, described powder specific area is 400m ²/ kg ~ 900m ²/ kg, described admixture is water reducer or air entrapment agent, and the massfraction of described water reducer is 0.2% ~ 1%, and the massfraction of described air entrapment agent is 0.03% ~ 0.6%.

Described active pozzolans powder, its processing quality index is:

(1) Shao Shi Liang≤1.8%;

(2) SO ₃han Liang≤0.08%;

(3) containing carbon amounts≤0.02%;

(4) Xu water yield Bi≤95% ~ 100%;

(5) strength ratio >=75%;

(6) Han Shui Liang≤1%.

Preferably, described powder specific area is 600m ²/ kg ~ 900m ²/ kg.

Preferably, the massfraction of described water reducer is 0.2% ~ 0.6%.

Preferably, the massfraction of described air entrapment agent is 0.03% ~ 0.5%.

Present invention also offers a kind of finished product made according to described active pozzolans powder, it is the silicate cement of 80% ~ 40% that described finished product comprises mass percent for volcanic ash powder described in 20% ~ 60% and massfraction, prepares concrete for hydraulic structure according to different demand.

Compared with prior art, the beneficial effect that the present invention has is: the present invention adopts a kind of active pozzolans powder to be spiked in concrete as additive, instead of original flyash, not only solve region resource, can gather materials on the spot, adopt active pozzolans powder, volcanic ash powder is at loss on ignition, SO ₃the aspect such as content and carbon containing amount is obviously better than flyash, has obvious economic worth.

The quality parameter that volcanic ash powder of the present invention and flyash contrast is in table 1.

The quality parameter of table 1 volcanic ash powder and flyash

Embodiment

A kind of active pozzolans powder, comprises SiO ₂, Al ₂o ₃and admixture, described SiO ₂and Al ₂o ₃massfraction be not less than 80%, described powder specific area is 400m ²/ kg ~ 900m ²/ kg, described admixture is water reducer or air entrapment agent, and the massfraction of described water reducer is 0.2% ~ 1%, and the massfraction of described air entrapment agent is 0.03% ~ 0.6%.

Preferably, described powder specific area is 600m ²/ kg ~ 900m ²/ kg.

Preferably, the massfraction of described water reducer is 0.2% ~ 0.6%.

Preferably, the massfraction of described air entrapment agent is 0.03% ~ 0.5%.

The present invention adopts a kind of active pozzolans powder to be spiked in concrete as additive, instead of original flyash, and not only solve region resource, can gather materials on the spot, volcanic ash powder is at loss on ignition, SO ₃the aspect such as content and carbon containing amount is obviously better than flyash, has obvious economic worth.

Claims

1. an active pozzolans powder, comprises SiO ₂, Al ₂o ₃and admixture, described SiO ₂and Al ₂o ₃mass percent be not less than 80%, it is characterized in that: described powder specific area is 400m ²/ kg ~ 900m ²/ kg, described admixture is water reducer or air entrapment agent, and the massfraction of described water reducer is 0.2% ~ 1%, and the massfraction of described air entrapment agent is 0.03% ~ 0.6%.

2. a kind of active pozzolans powder according to claim 1, is characterized in that: described powder specific area is 600m ²/ kg ~ 900m ²/ kg.

3. a kind of active pozzolans powder according to claim 1 and 2, is characterized in that: the massfraction of described water reducer is 0.2% ~ 0.6%.

4. a kind of active pozzolans powder according to claim 3, is characterized in that: the massfraction of described air entrapment agent is 0.03% ~ 0.5%.

5. a kind of active pozzolans powder according to claim 1, it is characterized in that: described active pozzolans powder, its processing quality index is: