DD244546A1 - METHOD FOR PRODUCING A SPECIAL CONCRETE MASS - Google Patents

Abstract

The invention relates to a process for the production of a special concrete mass using filter ash, wherein an ash-water suspension is to be prepared in such a way that propellant, disintegration and shrinkage phenomena of the concrete are prevented. This is inventively achieved in that an ash-water suspension prepared with a water-ash ratio of 0.4 to 1.2 and then a strong water-binding the hardening and / or the binding affecting substance of 10 to 60 Ma. %, based on the total mixture is added.

Description

Field of application of the invention

The invention relates to a process for the production of a special concrete mass using filter ash.

Characteristic of the known technical solutions

When using filter bags (FA) for a building material use one must distinguish two main directions of application.

1. Use of the filter ash as an additive

2. Use of the filter ash as a binder

A combination of both directions of application is possible.

A process is known for the utilization of filter ash as binder, whereby a suifatic excitation of the filter ash with anhydrite is carried out and this building material is used for the production of filling compounds (DD-PS 104600). Hard-to-use wet and filter ashes can be fed to a constructional use by the ashes gypsum and / or cement is added in a certain ratio and the ash is previously in Granuliereinrichtungen to Aschepellets -yerarbeiteisowowsmahlen (DD-PS 48156).

The production of ash granulate and use as an additive or binding agent is known from further patents (DD-PS 35222,223699).

From filter ash can be produced in a known manner porous blocks by adding a foaming agent, beaten, concrete, molded and the molding is brought by air hardening for setting (DE-OS 841728).

Also known is a method for filling and sealing surface storage sites with waste from power plants.

In this case, an ash suspension is passed to the storage place by means of pipelines and admixed with known binders (DD-PS 201 816).

All listed methods for the use of fly ash for the production of building materials adhere to technical and economic deficiency, which were detrimental to a recovery of these ashes in an economically significant extent.

Although additional grinding of the ashes in many cases leads to an improvement in the strength properties, but in most cases dripping and decay phenomena of the materials produced using ground ash can not be eliminated.

In the same way, in many cases, the proposed method does not fully hydrate the

Ashes contained active share can be achieved. ·

But that the binder properties of these ashes are greatly reduced.

As a further disadvantage of known methods of not inconsiderable expenditure on equipment must be mentioned.

In general, the known methods lack the fact that the quality characteristics of known constructions and structures, which can also be secured with other binders, are aimed at by partial substitutions of additives and proportionate binders.

The focus of these procedures is therefore always the substitution effect and not the achievement of new quality features and the development of new applications.

Object of the invention

The aim of the invention is to reduce the cost of producing a concrete mass of filter ashes and to develop an all-purpose building material from secondary raw materials.

Explanation of the essence of the invention

The invention has for its object to produce an ash-water suspension so that propellant, decay and shrinkage phenomena of the concrete are prevented.

This is inventively achieved in that an ash-water suspension prepared with a water-ash factor of 0.4 to 1.2 and then a strong water-binding the hardening and / or binding affecting substance of 10 to 60Ma .-% , based on the total mixture is added.

embodiment

On the basis of several embodiments, the invention will be explained in more detail.

The basis for all embodiments represent subsequent production groups, which can be divided into three main categories.

A: Taking into account the technologically conditioned minimum water content and the density of the fly ash, an ash-water suspension is prepared, it being ensured that the volume of the suspension in about the volume of water and Reindichteverdrängungsvolumen the ash

Ash mass in kg ReindichtederAscheinkg / l

 ) corresponds. (W / A factor = 0.4-1.2)

This is to be secured with technologically conditioned minimum water requirement of relatively stiff suspension only with an intensive mixing process.

By adding warm water, the setting reactions in the special concrete mass can be accelerated without causing premature dehydration (combustion).

B: For stiffening, water binding and strength, density and durability increase against aggressive media, the ash-water suspension is a fine-grained, mineral substance, such as low binder active ash and / or cement and / or other fine-grained mineral residues and / or other water-containing aggregates, blended with a binder technology little active ash-water suspension generally 2ement as a strength carrier and a binder active active ash-water suspension cement only under certain circumstances as an activator and strength improver and to increase the tightness and tightness must be added. Basically, the resulting mixture hardens as shrink-free, resistant concrete with a high number of adhesive bridges, high bending tensile stress, good Ε-Modulus and high tightness.

C: For the purposeful technological and utility value improvement of the fresh concrete with mineral and / or synthetic additives is added by the mixing process and / or by pressing operations, which improves the load capacity and / or the elastic behavior and / or thermal insulation and the technological susceptibility to premature dehydration.

The following examples show, taking into account the above-mentioned principles, the advantages and diverse possible uses of the special concrete mass.

example 1

Pumpable thermal insulation screed

Binder technology active ash-water suspension is pumped using preferably hot water nonti LJni-ntnl liinnnnri inn Λ · ίι if jJ! Si t ίί-ιι-Ι-ι * \ ni-Jfin A Ci lfi \ r \ f \ fi £% r \ l * r \ "it> + fi 1Ι / + ΪΛ1""* i ι ι fr * Ω \ r \ * · O f \ h + tJ + Qif * or * St. -» ^ ll ΏΙΛ iinH Qi 'hÖ H ^- Q + Λ kl Π Ω

Binder-technically active ash-water suspension (5 room parts, liquid) + binder less active ash (4 room parts) + cement (1 room part)

= Thermal insulation screed (light liquid)

Example 2

Use in road construction

a) Substructure, production according to group A and B

Binder-technically active ash-water suspensionJ3 space parts lightly liquid) + binder-less active ashes (3 room parts)

= Fresh concrete (stiff consistency) After transport, installation and intensive compaction, a substructure is created in joint-free execution.

N (compressive strength after 28 days of 12 γ at one

Bending tensile strength of 5 5)

mm ²

b) superstructure, production according to group A and B

Binder technology active ash-water suspension (3 room parts, light liquid) + cement (2 room parts PZ 4/45)

= Fresh concrete (plastic consistency)

After transport, installation and compaction with vibration technology or bitumen consolidators, a high-quality, seamless wear layer is created.

The load-bearing capacity and tightness of the superstructure can be further improved by adding 3.5 parts of well-graded bitumen chippings during the mixing process. The application to the fresh substructure can be done immediately in 2-4cm thickness.

With the addition of 3.5 parts by volume of fibrous, resistant, crack-resistant residues with a short fiber length of about 5 mm is a wear layer with a little low load capacity, but higher elasticity and Biegezugbeanspruchung produced.

c) Road rehabilitation, production as in Example 2 b, with an additional coarse aggregate framework (eg gravel) being pressed into the special concrete mass.

Example 3

Concrete for waterproof structures, low gas permeability concrete and concrete for earthquake-resistant constructions Manufacture according to group A, B and C as example 2b

Example 4

• thermal insulation mortar (putty), production according to group A, B and C Binder-technically less active ash-water suspension (3 room parts, light liquid)

+ Cement (3 room parts)

+ fine-grained sawdust (3 room parts) β

= smooth spatula-like thermal insulation mortar corresponding to mortar group II

Example 5

• Concrete for dynamically stressed delicate structures, production according to group A and B Binder technology active ash-water suspension (3 room parts, viscous)

+ Cement (2 room parts PZ 4/45)

= Fresh concrete, which gives shape and hardening feiningliedrige elements

Examples

• Ceramic mass

Binder technology active ash-water suspension (3 room parts, slightly liquid) + cement (2 room parts PZ 4/45)

= Fresh concrete (plastic consistency)

Example 7

• Pipe lining, production according to group A, B and C as in Example 2 b, where textile webs are glued to the pipe walls as adhesion primer.

Example 8

• Chimney rehabilitation mass, production according to group A and B as in example 5, whereby the lining is made from bottom to top with a traction device, which is wedged via spreader jaws at the chimney interior and fed from above.

Example 9

• Prefabrication of components, production according to group A, B and C.

Binder-wise active ash-water suspension (1 part of space, low-viscosity) + rubble with graduated grain size (2-3 room parts)

= Fresh concrete, which is used after shaping and hardening as a hand assembly stone with good thermal insulation.

Claims (26)

Invention claim: Anspruch [en] A process for producing a slurry of a concrete composition using filter ash, characterized in that an ash-water suspension having a water-ash factor of 0.4 to 1.2 is prepared and thereafter a water-binding agent of 10 to 60% by mass. , based on the total mixture is added. 2. The method according to item 1, characterized in that as the hardening and / or binding affecting water-binding substances are used low active fine-grained ash and / or cement and / or other fine-grained mineral residues. 3. The method according to item 1, characterized in that as the weave influencing substances textile chips and / or organic fuel residues and / or wood fibers are used. 4. The method according to item 1, characterized in that is used as ash-water suspension incurred after Spülentaschung at the landfill not yet hardened filter ash. 5. The method according to item 1, characterized in that a dense scaffold forming substances such as xylitol, rubble and demolition material are added. 6. The method according to item 1,2 and 5, characterized in that the mixture is produced as a substructure and / or superstructure for road construction in joint-free design. 7. The method according to item 6, characterized in that on the freshly prepared high density joint-free substructure immediately a plastic, thin layer, jointless building is applied. 8. The method according to item 1 and 2, characterized in that the mixture is used as a liquid screed. 9. The method according to item 1,2,3 and 5, characterized in that the mixture is introduced for road repairs and Fugenverfüllungen in the damaged area, being pressed as an additional scaffold Coarse aggregates and additional dewatering of the special concrete masses is carried out with the compression process. 10. The method according to item 9, characterized in that the mixture is used as a plastic thin layer, jointless overbuilding. 11. The method according to items 1,2 and 5, characterized in that the mixture is used for the production of structures with increased water hazard in civil engineering. 12. The method according to item 1 and 2, characterized in that the mixture is used as mortar. 13. The method according to item 12, characterized in that the mixture heat-insulating additives are added. 14. The method according to item 1, 2 and 3, characterized in that the mixture for the production of highly dynamically stressed structures, in particular with high fineness, is used. 15. The method according to pt. 1, 2 and 5, characterized in that the mixture is used for ceramic products. 16. The method according to item 14, characterized in that the mixture is pressed. 17. The method according to item 15, characterized in that the mixture is jjurch concrete colors in customary and / or colored by water-soluble paints and / or tinting pastes in the mixing water. 18. The method according to item 1,2 and S, characterized in that the mixture is used for pipe lining and / or renovation on a primer. 19. The method according to item 1 and 2, characterized in that the mixture for the production of reinforcing elements in one of the ash suspension mixed minimum cement content of 500 kg / m ³ is used. 20. The method according to item 1,2 and 3, characterized in that the mixture is used for building renovation as a grout. 21. The method according to item 1 and 2, characterized in that the mixture is used for chimney renovation. 22. The method according to item 21, characterized in that the mixture is applied several times. 23. The method according to item 1, 2, 3 and 5, characterized in that the mixture is used for the production of components. 24. The method according to item 1, 2, 3 and 5, characterized in that the mixture is used with lightweight, porous aggregates for the prefabrication of heat-insulating components. 25. The method according to item 1, 2 and 3, characterized in that the mixture is used for building safety in earthquake-prone areas. 26. The method according to Pkt. 1,2 and 3, characterized in that the mixture is used for the production of lightweight watertight floats.