CN102898106B - High-compactness thermal-storage concrete and preparation method thereof - Google Patents

Abstract

The invention relates to a high-compactness thermal-storage concrete and a preparation method thereof, and belongs to the technical field of the thermal-storage material. The high-compactness thermal-storage concrete disclosed by the invention is prepared from 12.0-26.0 parts of sulphoaluminate cement, 65.0-80.0 parts of aggregate consisting of steel slag and basalt, 1.0-5.0 parts of graphite, 1.0-5.0 parts of slag powder, 3.0-10.0 parts of water and 0.1-1.0 part of water reducing agent. The gradation of the aggregate is designed by vast experiments, so that the aggregate accumulation achieves the tight accumulation state, the self compactness of the concrete is improved, and the problem of small thermal-storage density of the concrete is fundamentally solved. Therefore, the high-compactness thermal-storage concrete disclosed by the invention has excellent thermal performances, such as big thermal-storage density and good thermal conductivity. The preparation method disclosed by the invention has a simple method and is easy to operate. Because the steel slag is used as the fine aggregate, the industrial waste slag is fully utilized, and the production cost is lowered.

Description

High compact accumulation of heat concrete and preparation method thereof

Technical field

The present invention relates to a kind of high compact accumulation of heat concrete and preparation method thereof, belong to heat accumulating technical field.

Background technology

Energy problem is a great problem that the world today faces, and in China, along with adjustment and the development of national economy, energy problem has become the bottleneck problem of restriction China Economic development.Utilize in system in much industry and building and heating homenergic, often exist the difference of energy supply and required time, a large amount of wastes that caused energy to utilize.One of effective way addressing this problem is exactly to adopt heat storage technology.

Divide by heat storage type, heat-storing material can be divided into four classes: sensible heat heat-storing material, phase change heat storage material, thermochemistry heat-storing material and adsorptive heat-storage material.Wherein sensible heat accumulation of heat concrete has advantages of stable performance, simple to operate, cost is low, becomes one of more heat-storing material of application.But the concrete thermal storage density of sensible heat accumulation of heat is little, average quantity of heat storage is only about 100kWh/m ³; Therefore the thermal storage equipment that adopts sensible heat accumulation of heat concrete to be prepared from, it is bulky, heat storage efficiency is not high, thermal conductivity <1w/ (mK), and exist the temperature difference can cause calorific loss with surrounding environment, heat can not standing storage, is not suitable for long-time, large capacity accumulation of heat, has limited that sensible heat accumulation of heat is concrete to be further developed.

Summary of the invention

In order to solve the little problem of sensible heat accumulation of heat concrete thermal storage density, the concrete grating that the present invention gathers materials by change provides the high compact accumulation of heat that a kind of heat storage efficiency is high, volume is little concrete.The present invention also provides this high compact accumulation of heat concrete preparation method.

A kind of high compact accumulation of heat concrete, is prepared from by the raw material of following weight ratio:

12.0 ~ 26.0 parts of aluminosulfate cements,

Gather materials 65.0 ~ 80.0 parts,

1.0 ~ 5.0 parts, graphite,

1.0 ~ 5.0 parts of slag powders,

3.0 ~ 10.0 parts, water,

0.1 ~ 1.0 part of water reducer;

Described gathering materials is made up of slag and basalt, and concrete grating is as follows:

Slag particle diameter	Weight percentage in gathering materials	Basalt particle diameter	Weight percentage in gathering materials
				?0.075～0.15mm	2.40～5.50	2.36～4.75mm	16.50～20.50
0.15～0.3mm	3.50～7.50	4.75～9.5mm	15.50～25.50
				0.3～0.6mm	5.50～8.70	9.50～16mm	15.50～26.50
0.6～1.18mm	7.50～11.50	?	?
				1.18~2.36mm	10.20～14.50	?	?

The proportion design of existing concrete heat-storing material is all taking common concrete proportioning as basis, adopts thermal capacitance and the large material of thermal conductivity to be prepared from, and can not fundamentally solve the little problem of accumulation of heat concrete thermal storage density.The present invention designs the grating of gathering materials in the present invention through lot of experiments, makes to gather materials to pile up to reach closest packing state, has improved the degree of compactness of concrete itself, fundamentally solves the difficult problem that concrete thermal storage density is little.

Above-mentioned high compact accumulation of heat concrete, selected graphite specific surface area is preferably 270-390m ²/ Kg.

Above-mentioned high compact accumulation of heat concrete, selected water reducer is preferably polycarboxylate water-reducer.

The concrete preparation method of a kind of above-mentioned high compact accumulation of heat:

First, proportionally prepare raw material;

Then, 1/2 water and aluminosulfate cement, slag powders, graphite are stirred to 20～40s,

Secondly, then add the stirring 50～70s that gathers materials,

Finally, add water reducer and remaining water to stir 50～70s, both obtained product.

Beneficial effect of the present invention:

The present invention has improved concrete degree of compactness by changing aggregate grading; Select simultaneously basalt that specific heat capacity is larger, slag respectively as thick, fine aggregate and interpolation Graphite Powder 99 to increase the thermal conductivity of heat-storing material.Therefore, high compact accumulation of heat concrete of the present invention has the excellent thermal characteristicss such as the large and good heat conductivity of thermal storage density, can meet the needs of productive life with energy; Thereby overcome the deficiency that existing accumulation of heat concrete thermal storage density is little, thermal conductivity is low.High compact accumulation of heat concrete of the present invention has the advantages such as intensity is high, energy storage mode is simple.

Preparation method of the present invention is simple, easily operation; Use slag as fine aggregate, take full advantage of industrial residue, low production cost.

Embodiment

Comparative example 1

Get and account for 13.0% aluminosulfate cement, 1.8% slag powders, 3.7% graphite, 6.6% water, 74.5% gather materials of accumulation of heat concrete gross weight to be prepared, 0.4% water reducer; Described gathering materials is divided into fine aggregate and coarse aggregate, and fine aggregate is slag, and coarse aggregate is basalt; Graphite specific surface area is 380m ²/ Kg; Adopt slag to make fine aggregate, coarse aggregate is basalt, and granularity is 2.36-16mm, and thickness is gathered materials and all do not carried out classification;

Get the half of above-mentioned total Water, stir 20～40s with aluminosulfate cement, slag powders, graphite,

Then, then add the stirring 50～70s that gathers materials,

Finally, add water reducer and remaining water to stir 50～70s, both obtained accumulation of heat concrete.

Concrete ultimate compression strength>=the 30MPa of prepared accumulation of heat, volumetric heat capacity is 80-110Kwh/m ³, thermal conductivity is 0.7-1.2w/ (mK).

Embodiment 1

Get and account for 13.0% aluminosulfate cement, 1.8% slag powders, 3.7% graphite, 6.6% water, 74.5% gather materials of high compact accumulation of heat concrete gross weight to be prepared, 0.4% water reducer; Described gathering materials is divided into fine aggregate and coarse aggregate, and fine aggregate is slag, and coarse aggregate is basalt; Graphite specific surface area is 380m ²/ Kg;

The size grading of gathering materials and each particle diameter gather materials, and to account for total weight fraction gathering materials as follows:

Slag particle diameter	Weight percentage in gathering materials	Basalt particle diameter	Weight percentage in gathering materials
				?0.075～0.15mm	?2.56	2.36～4.75mm	17.36
0.15～0.3mm	?3.75	4.75～9.5mm	25.05
				0.3～0.6mm	?5.72	9.50～16mm	26.04
0.6～1.18mm	?7.89	?	?
				1.18~2.36mm	?11.64	?	?

Get the half of above-mentioned total Water, stir 20～40s with aluminosulfate cement, slag powders, graphite,

Then, then add the stirring 50～70s that gathers materials,

Finally, add water reducer and remaining water to stir 50～70s, both obtained high compact accumulation of heat concrete.

The prepared concrete ultimate compression strength>=50MPa of high compact accumulation of heat, volumetric heat capacity is 125-140Kwh/m ³, thermal conductivity is 2.0-4.0 w/ (mK).

Embodiment 2

Get and account for 14.9% aluminosulfate cement, 2.1% slag powders, 4.2% graphite, 7.4% water, 71.2% gather materials of high compact accumulation of heat concrete gross weight to be prepared, 0.2% water reducer; Described gathering materials is divided into fine aggregate and coarse aggregate, and fine aggregate is slag, and coarse aggregate is basalt; Graphite specific surface area is 350m ²/ Kg;

The size grading of gathering materials and each particle diameter gather materials, and to account for total weight fraction gathering materials as follows:

Slag particle diameter	Weight percentage in gathering materials	Basalt particle diameter	Weight percentage in gathering materials
				?0.075～0.15mm	? 3.52	2.36～4.75mm	17.49
0.15～0.3mm	? 5.00	4.75～9.5mm	23.31
				0.3～0.6mm	? 6.94	9.50～16mm	22.61
? 0.6～1.18mm	? 8.95	?	?
				1.18~2.36mm	? 12.18	?	?

Get the half of above-mentioned total Water, stir 20～40s with aluminosulfate cement, slag powders, graphite,

Then, then add the stirring 50～70s that gathers materials,

Finally, add water reducer and remaining water to stir 50～70s, both obtained high compact accumulation of heat concrete;

The prepared concrete ultimate compression strength>=50MPa of high compact accumulation of heat, volumetric heat capacity is 125-140Kwh/m ³, thermal conductivity is 2.0-4.0 w/ (mK).

Embodiment 3

Get and account for 20.3% aluminosulfate cement, 1.2% slag powders, 2.4% graphite, 7.2% water, 68.2% gather materials of high compact accumulation of heat concrete gross weight to be prepared, 0.7% water reducer; Described gathering materials is divided into fine aggregate and coarse aggregate, and fine aggregate is slag, and coarse aggregate is basalt; Graphite specific surface area is 300m ²/ Kg;

The size grading of gathering materials and each particle diameter gather materials, and to account for total weight fraction gathering materials as follows:

Slag particle diameter	Weight percentage in gathering materials	Basalt particle diameter	Weight percentage in gathering materials
				?0.075～0.15mm	? 5.37	2.36～4.75mm	19.42
0.15～0.3mm	? 7.02	4.75～9.5mm	17.77
				0.3～0.6mm	? 8.68	9.50～16mm	16.12
? 0.6～1.18mm	? 11.16	?	?
				1.18~2.36mm	? 14.46	?	?

The prepared concrete ultimate compression strength>=50MPa of high compact accumulation of heat, volumetric heat capacity is 125-140Kwh/m ³, thermal conductivity is 2.0-4.0 w/ (mK).

Claims (4)

1. a high compact accumulation of heat concrete, is characterized in that, is prepared from by the raw material of following weight parts:

12.0 ~ 26.0 parts of aluminosulfate cements,

Gather materials 65.0 ~ 80.0 parts,

1.0 ~ 5.0 parts, graphite,

1.0 ~ 5.0 parts of slag powders,

3.0 ~ 10.0 parts, water,

0.1 ~ 1.0 part of water reducer;

Described gathering materials is made up of slag and basalt, and concrete grating is as follows:

Slag particle diameter Weight percentage in gathering materials Basalt particle diameter Weight percentage in gathering materials ?0.075～0.15mm 2.40～5.50 2.36～4.75mm 16.50～20.50 0.15～0.3mm 3.50～7.50 4.75～9.5mm 15.50～25.50 0.3～0.6mm 5.50～8.70 9.50～16mm 15.50～26.50 0.6～1.18mm 7.50～11.50 ? ? 1.18~2.36mm 10.20～14.50 ? ?

。

2. high compact accumulation of heat concrete according to claim 1, is characterized in that, the specific surface area of graphite is 270-390m ²/ Kg.

3. high compact accumulation of heat concrete according to claim 1 and 2, is characterized in that, water reducer is polycarboxylate water-reducer.

4. the concrete preparation method of high compact accumulation of heat described in claim 1,2 or 3, is characterized in that:

First, proportionally prepare raw material;

Then, 1/2 water and aluminosulfate cement, slag powders, graphite are stirred to 20～40s,

Secondly, then add the stirring 50～70s that gathers materials,

Finally, add water reducer and remaining water to stir 50～70s, both obtained product.