CN102503199A

CN102503199A - Compound coal ash for concrete

Info

Publication number: CN102503199A
Application number: CN2011103739204A
Authority: CN
Inventors: 刘明旺; 黄福旺; 陆平; 赵秉礼; 徐立; 敖灶鑫
Original assignee: HAINAN LANDAO ENVIRONMENTAL PROTECTION INDUSTRY Co Ltd
Current assignee: HAINAN LANDAO ENVIRONMENTAL PROTECTION INDUSTRY Co Ltd
Priority date: 2011-11-08
Filing date: 2011-11-08
Publication date: 2012-06-20
Anticipated expiration: 2031-11-08
Also published as: CN102503199B

Abstract

The invention relates to compound coal ash for concrete. The compound coal ash for concrete is prepared according to the following steps: mixing basalt macadam with a grain size less than 50 millimeters and wet coal ash with a moisture content of 15 to 25 percent with hearth slag; drying the mixture; grinding the mixture into powder; and controlling the fineness being 45 microns and the residue on a square hole screen being less than 15 percent and the moisture content of the ground powder being less than 0.5 percent. The production process is simple; the cost is low; the industrial wastes, such as wet coal ash, hearth slag, and the like, are taken as raw materials; a part of cement in the concrete can be replaced by the obtained compound coal ash; the mechanical property and the durability of the concrete can be efficiently increased; the resource and energy source are saved; the industrialized production is boosted; and the environmental protection and the energy saving and emission reduction are boosted.

Description

Concrete is used composite fly ash

Technical field

The invention belongs to building field, relate to a kind of material of construction, specifically is that a kind of concrete is used composite fly ash.

Background technology

Concrete is meant that sand, masonry gather materials with gelling material (like cement), cooperates by a certain percentage with water (adding or do not add admixture and adulterant), and through stirring, moulding, maintenance and get, be one of contemporary topmost civil engineering material.Be the concrete performance of workability or sclerosis back of improving concrete mix;, mixes concrete levigated mineral material---adulterant when stirring; To substitute part cement; Reduce cement consumption, the character of adulterant and quantity influence concrete intensity, distortion, hydration heat, impermeability and color etc.

At present concrete admixture is main with a second class powered coal ash, GBFS, slag micro powder mainly, but these adulterant skewness, and some regional quantity is less relatively, can't satisfy user demand and unit price is higher; Though domestic also have Irish touchstone is finely ground to micro mist is used for concrete and makes adulterant and use; But just use the Irish touchstone pulverized powder separately, water requirement is big when mixing the concrete stirring, and concrete is prone to bleeding; Flowing property is relatively poor, and water retention property and early age strength of concrete are low.

Wet-discharged coal ash is the original state ash of directly collecting through wet method, and without sorting, and water ratio is big, and at home mainly as brick producing material, use does not still have good method as concrete admixture at present.Wet-discharged coal ash is as the use of concrete admixture at present; Not enough below existing: the one, adopt wet-discharged coal ash to be made into slip and use; But moisture content is difficult to control, and owing to wet the ash discharge place not by concrete mixing plant, slip is difficult to transportation; And quality is unstable, is made into concrete and is difficult to ensure the quality of products; The 2nd, adopt earlier grinding again after the wet-discharged coal ash oven dry, the production process airborne dust is big, and atmospheric pollution is serious, and energy consumption is too high, and cost is high.The mode that above-mentioned two kinds of wet-discharged coal ashs use in concrete all exists quality product wayward, particularly the problem that exceeds standard easily etc. of loss on ignition, sulfur trioxide content, stability and free calcium oxide content.

Summary of the invention

The objective of the invention is to the deficiency of prior art and provide a kind of concrete to use composite fly ash; Trade wastes such as discarded corner building stones to measure the wet-discharged coal ash that is easy to get greatly and furnace bottom slag, basalt stone field are main raw material, and cost is low, and production technique is simple; Part cement in the gained composite fly ash instead concrete; Improve mechanical performance of concrete and weather resistance effectively, economize on resources and the energy, help suitability for industrialized production; Can handle industrial residue in a large number, help environment protection and energy-saving and emission-reduction.

The technical scheme that the present invention adopted:

A kind of concrete is used composite fly ash; Be particle diameter to be carried out grinding to powder fineness less than 50 millimeters basaltic broken stone and water ratio be controlled at 45 microns square hole sieves and tail over after 15～25% wet-discharged coal ash, furnace bottom slag mix less than 15%; Dry in the grinding process to handle and use abrasive dust material water ratio and obtain concrete less than 0.5% and use composite fly ash; Wherein in butt, each components based on weight percentage is respectively: Irish touchstone 30%～80%, wet-discharged coal ash 10%～50%, furnace bottom slag 10%～30%.

Said grinding is one or both combinations in ball milling, vertical roller grinder, vibration mill or the Raymond mill.

Among the present invention; Its production technique is: earlier Irish touchstone corner building stones are broken into rubble below 50 millimeters; Press formula rate basaltic broken stone and water ratio are added the furnace bottom slag at 15～25% wet-discharged coal ash; Mix the back and get into grinding system and carry out grinding processing, go out abrasive dust material fineness and be controlled at 45 microns square hole sieves and tail over less than 15% (preferably tail over and be less than or equal to 10%), in grinding process; Adopt the fluidizing furnace heat air delivery to dry, guarantee out that abrasive dust material water ratio is less than 0.5% (preferably less than 0.3%) advancing grind materials.

Production technique of the present invention is simple; Cost is low, with measure the furnace bottom slag that the wet-discharged coal ash that is easy to get greatly and boiler combustion produce, the trade wastes such as discarded corner building stones of basalt stone field are main raw material, the part cement in the gained composite fly ash instead concrete; Improve mechanical performance of concrete and weather resistance effectively; Economize on resources and the energy, help suitability for industrialized production, help environment protection and energy-saving and emission-reduction.

Embodiment

Below in conjunction with embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.

Embodiment one

The chemical constitution such as the table 1 of Irish touchstone, wet-discharged coal ash and furnace bottom slag:

Table 1

Get Irish touchstone 65kg and be broken into rubble below 50 millimeters; Then basaltic broken stone and water ratio being added furnace bottom slag 10kg in proportion at 18% wet-discharged coal ash 25kg mixes laggardly to go into milling system and carry out grinding processing; Going out abrasive dust material fineness is controlled at 45 microns square hole sieves and tails over less than 15%; In grinding process; Adopt the fluidizing furnace heat air delivery to dry, simultaneously for guaranteeing out that storage of abrasive dust feed bin and transportation need guarantee out that normally abrasive dust material water ratio less than 0.5%, obtains concrete and uses composite fly ash to advancing grind materials.

Embodiment two

The chemical ingredients of Irish touchstone, wet-discharged coal ash, furnace bottom slag is with embodiment one.

Get Irish touchstone 40kg and be broken into rubble below 50 millimeters; Then basaltic broken stone and water ratio being added furnace bottom slag 20kg in proportion at 20% wet-discharged coal ash 40kg mixes the back and gets into the vertical roller grinder system and carry out grinding processing; Going out abrasive dust material fineness is controlled at 45 microns square hole sieves and tails over less than 15%; In grinding process; Adopt the fluidizing furnace heat air delivery to dry, simultaneously for guaranteeing out that storage of abrasive dust feed bin and transportation need guarantee out that normally abrasive dust material water ratio less than 0.5%, obtains concrete and uses composite fly ash to advancing grind materials.

Embodiment three

The chemical constitution such as the table 2 of Irish touchstone, wet-discharged coal ash and furnace bottom slag:

Table 2

Get Irish touchstone 40kg and be broken into rubble below 50 millimeters; Then basaltic broken stone and water ratio being added furnace bottom slag 27kg in proportion at 22% wet-discharged coal ash 33kg mixes the back and gets into the vertical roller grinder system and carry out grinding processing; Going out abrasive dust material fineness is controlled at 45 microns square hole sieves and tails over less than 15%; In grinding process; Adopt the fluidizing furnace heat air delivery to dry, simultaneously for guaranteeing out that storage of abrasive dust feed bin and transportation need guarantee out that normally abrasive dust material water ratio less than 0.5%, obtains concrete and uses composite fly ash to advancing grind materials.

Embodiment four

The chemical ingredients of Irish touchstone, wet-discharged coal ash, furnace bottom slag is with embodiment three.

Get Irish touchstone 35kg and be broken into rubble below 50 millimeters; Then basaltic broken stone and water ratio being added furnace bottom slag 15kg in proportion at 20% wet-discharged coal ash 50kg mixes the back and gets into the vibration mill system and carry out grinding processing; Going out abrasive dust material fineness is controlled at 45 microns square hole sieves and tails over less than 15%; In grinding process; Adopt the fluidizing furnace heat air delivery to dry, simultaneously for guaranteeing out that storage of abrasive dust feed bin and transportation need guarantee out that normally abrasive dust material water ratio less than 0.5%, obtains concrete and uses composite fly ash to advancing grind materials.

Detect:

With the cement of the concrete in the embodiment of the invention with the alternative 10%-30% of composite fly ash, high-performance concrete, various performances such as table 4.Wherein do not adopt the control group that is of composite fly ash.Testing used starting material is:

Cement: ordinary Portland cement P.O42.5

Sand: medium sand

Rubble: 5-30mm rubble

High efficiency water reducing agent: high-efficiency water-reducing agent of poly-carboxylic acid.

Each organizes mix proportion such as table 3:

Table 3 (kg/m ³)

The prepared concrete slump and ultimate compression strength such as table 4:

Table 4

Table 3, table 4 is the result show, and the concrete of mixing composite fly ash can significantly reduce water consumption and cement consumption, substitutes 10%-30% cement with the different varieties composite fly ash, and concrete has still obtained high compression strength, with plain cement ultimate compression strength basically identical.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims

1. a concrete is used composite fly ash; It is characterized in that particle diameter is carried out grinding to powder fineness less than 50 millimeters basaltic broken stone and water ratio to be controlled at 45 microns square hole sieves and to tail over less than 15% after 15～25% wet-discharged coal ash, furnace bottom slag mix; Dry in the grinding process to handle and use abrasive dust material water ratio and obtain concrete less than 0.5% and use composite fly ash; Wherein in butt, each components based on weight percentage is respectively: Irish touchstone 30%～80%, wet-discharged coal ash 10%～50%, furnace bottom slag 10%～30%.

2. concrete according to claim 1 is used composite fly ash, it is characterized in that: said grinding is one or both combinations in ball milling, vertical roller grinder, vibration mill or the Raymond mill.