CN105645894A - High-performance concrete with large mixing amount of mineral powder and manufacturing method of high-performance concrete - Google Patents

Abstract

The invention discloses high-performance concrete with a large mixing amount of mineral powder and a manufacturing method of the high-performance concrete. The high-performance concrete is manufactured from cement, slag powder, coal ash, crushed stone, river sand, water, an exciting agent, and a water reducer, and comprises, by weight part: 140-170 parts of cement, 170-240 parts of slag powder, 50-100 parts of coal ash, 1010-1100 parts of crushed stone, 735-825 parts of river sand, 150-180 parts of water, 11-15 parts of an exciting agent, and 3.4-5 parts of a water reducer. Slag powder and coal ash are re-mixed into the concrete as a supplementary cementitious material, through an exciting effect of the sodium sulfate exciting agent, to manufacture the high-performance concrete with a large mixing amount of mineral powder. Long-term strength, durability, and working performance of the cement concrete are effectively improved. A large amount of industrial waste, such as mineral powder and coal ash, is utilized in the formula, thereby reducing cement consumption in pre-mixed concrete. The cost is reduced, and the method is energy-saving and eco-friendly.

Description

A kind of large dosage ore deposit powder high performance concrete and its preparation method

Technical field

The invention belongs to high performance building materials preparation field, particularly relate to a kind of large dosage ore deposit powder high performance concrete and its preparation method.

Background technology

Cement concrete, as one of the most general material of construction of current domestic application, has important existent value in whole building circle. Increasingly extensive along with cement concrete range of application, its performance degradation problem in physical environment comes out gradually, and causes the attention of people. Portland cement concrete has very high ultimate compression strength and bigger rigidity, but the shortcoming such as there is easy shrinkage cracking in gel hardening process, folding strength is low, poor toughness, ultimate extension degree are little, and these shortcomings become more obvious along with the raising of cement concrete strength.

The fast development of high performance concrete in recent years, drive the extensive application of mineral admixture, particularly in commerical ready-mixed concrete, mineral admixture has become indispensable a kind of component, and most widely used at present is replace cement with slag powders and flyash to prepare concrete. Concrete mixes slag powders and flyash with suitable proportion, the two performance can be made to occur complementary, produce over-superimposed effect: slag powders can produce volcano ash effect in gelling system, improving the interface structure starching body and aggregate in concrete, its nucleation can improve basicity and the OH of concrete mortar simultaneously^-Content, excites the activity of flyash, thus improves concrete anti-compression and folding strength; The increasing of mixing of slag powders and flyash measures for cement, reducing cement consumption, the heat that hydrated reaction of cement is produced significantly reduces, and thus decreases the temperature difference crack produced by hydration heat, improve the globality of concrete structure, concrete weather resistance is improved; Slag powders and fly ash grain are relatively thin than cement granules, can filling concrete void among particles, the free water in space is released, it is to increase concrete mobility, concrete serviceability is improved.

Chinese patent CN103922680A " method of high content mineral admixtures configuration GHPC ", propose taking S95 level ore deposit powder and II level flyash as mineral admixture concrete batching, with the consumption that economizes on resources, protection of the environment, but the maximum doping quantity of slag powders only accounts for the 25% of gelling material total mass in this kind of method, volume is lower, and the contribution of energy-saving and emission-reduction is very limited; Chinese patent CN103819157A " a kind of new concrete ", propose using slag powders and flyash as supplementary cementitious material, and activate with a large amount of exciting agent, reach the object improving concrete strength, degree of compactness and weather resistance, but exciting agent consumption is up to 13.5��15kg in every cubic metre of this concrete, the use of a large amount of exciting agent can increase cement peak thermal discharge, concrete is caused to produce temperature difference crack, and concrete early hydration is very fast, but later strength almost without growth, is unfavorable for the performance of concrete strength.

Summary of the invention

It is an object of the invention to provide that a kind of technique is simple, cost is low, easy enforcement and environment favourable there is the large dosage ore deposit powder high performance concrete and its preparation method that improve cement concrete strength, workability and weather resistance function.

] for achieving the above object, the technical solution adopted in the present invention is:

A kind of large dosage ore deposit powder high performance concrete, it is characterized in that being prepared from by cement, slag powders, flyash, rubble, river sand, water, exciting agent and water reducer, count by weight: cement 140��170 parts, slag powders 170��240 parts, 50��100 parts, flyash, rubble 1010��1100 parts, 735��825 parts, river sand, 150��180 parts, water, exciting agent 11��15 parts, water reducer 3.4��5 parts;

In described concrete, gelling material is made up of ordinary Portland cement, slag powders and flyash, and slag powders accounts for the 50��60% of gelling material total mass, and flyash quality is the 15��30% of gelling material total mass.

By such scheme, described slag powders is the S95 level ore deposit powder that median size 2.36��4.75mm, specific surface area are not less than 400/kg.

By such scheme, described flyash is that 45 ��m of square hole sieves tail over and are not more than 12%, and loss on ignition is not more than the I level flyash of 5%.

By such scheme, described rubble is 5��25mm continuous grading rubble.

By such scheme, described river sand is the middle sand that level is joined.

By such scheme, described exciting agent is sodium sulfate exciting agent.

By such scheme, described water reducer is 20wt% polycarboxylate water-reducer solution; Wherein composite enter 3��5wt% lignosulfonic acid sodium solution, lignosulfonic acid na concn is 45wt%.

The preparation method of above-mentioned large dosage ore deposit powder high performance concrete, comprises the following steps:

Adding in stirrer by cement, slag powders, flyash, rubble, river sand, dry mixing 30��40min is until evenly; In stirrer, add water, exciting agent and water reducer, stir 10��15min, obtain large dosage ore deposit powder high performance concrete.

Slag powders and flyash are mixed again as supplementary cementitious material in concrete, by the excitation of sodium sulfate exciting agent, prepares large dosage ore deposit powder high performance concrete, can effectively improve the longterm strength of cement concrete, weather resistance and serviceability; Trade waste replaces cement and as supplementary cementitious material and adds water reducer, can reduce water-cement ratio, it is to increase the consumption of supplementary cementitious material while ensureing the concrete mixing water yield; Cement consumption in concrete can be reduced, reduce cement concrete production cost; From the angle of environment protection; use trade waste in a large number; can effectively save cement consumption, decrease the natural resources consumption caused because of manufacture of cement, solve simultaneously and stack caused environmental pollution and land seizure problem by trade wastes such as slags in a large number.

Relative to prior art, the present invention has following useful effect:

Slag powders and flyash mix concrete, can reduce the temperature difference crack produced because of hydrated cementitious, it is to increase the globality of concrete structure, and thus concrete weather resistance is also improved.

Effectively improve long-term strength of concrete, especially long-term folding strength, make it to be widely used in the higher engineering of the antagonism folding requirement of strength such as Longspan Bridge, road, Supporting Load Pavement. Improve and concrete secrete water isolation and workability, it is to increase concrete serviceability.

Utilize the trade wastes such as ore deposit powder, flyash in a large number, reduce cement consumption in ready mixed concrete, reduce costs, energy-conserving and environment-protective.

Embodiment

Following examples explain the technical scheme of the present invention further, but not as limiting the scope of the invention.

Large dosage ore deposit of the present invention powder high performance concrete, preparation process is as follows:

Count by weight: cement 140��170 parts, slag powders 170��240 parts, 50��100 parts, flyash, rubble 1010��1100 parts, 735��825 parts, river sand, 150��180 parts, water, exciting agent 11��15 parts, water reducer 3.4��5 parts; Wherein gelling material is made up of ordinary Portland cement, slag powders and flyash, and slag powders accounts for the 50��60% of gelling material total mass, and flyash quality is the 15��30% of gelling material total mass. Slag powders is the S95 level ore deposit powder that median size 2.36��4.75mm, specific surface area are not less than 400/kg. Flyash is that 45 ��m of square hole sieves tail over and are not more than 12%, and loss on ignition is not more than the I level flyash of 5%.

Rubble is 5��25mm continuous grading rubble. River sand is the middle sand that excellent level is joined. Exciting agent is sodium sulfate exciting agent. Water reducer is 20wt% polycarboxylate water-reducer solution; Wherein composite enter 3��5wt% lignosulfonic acid sodium solution, lignosulfonic acid na concn is 45wt%.

Adding in stirrer by cement, slag powders, flyash, rubble, river sand, dry mixing 30��40min is until evenly; In stirrer, add water, exciting agent and water reducer, stir 10��15min, obtain large dosage ore deposit powder high performance concrete.

6 kinds of concrete are prepared according to mass fraction shown in table 1.

Table 1

Numbering	Cement	Ore deposit powder	Flyash	Sand	Stone	Sand coarse aggregate ratio	Exciting agent	Water reducer	Water	Water-cement ratio
											000	461	0	0	512	1252	0.29	0	0	175	0.38
001	136	204	62	790	1087	0.42	0	4.1	165	0.48
											002	136	204	62	790	1087	0.42	13.3	4.1	165	0.48
003	150	225	65	760	1074	0.41	15.1	5.1	165	0.44
											004	166	249	70	750	1059	0.41	16.7	6.1	165	0.40
005	183	275	74	735	1045	0.41	17.9	7.1	165	0.36

Concrete raw material is selected: sand, rubble, tap water in Yadong board P O42.5 ordinary Portland cement, S95 level granulation ground granulated blast furnace slag, I level heat power plant flyash, sodium sulfate exciting agent, water reducer (the composite sodium lignosulfonate of high-efficiency water-reducing agent of poly-carboxylic acid), high-quality.

The I level heat power plant main technical indicator of flyash meets the associated specifications in GB GB/T1596-2005 " flyash in cement and concrete "; The S95 level granulation main technical indicator of ground granulated blast furnace slag meets the associated specifications in GB GB/T18046-2008 " the granulation ground granulated blast furnace slag in cement and concrete ". Gained concrete performance is as shown in table 2.

Table 2

Performance Detection, result shows: concrete water-retentivity, mobility, sticky poly-property are good, excellent working performance; Compare with the normal concrete of identical strength grade, mix its 28d, 60d, 90d, 180d ultimate compression strength of large dosage ore deposit powder high performance concrete adding sodium sulfate exciting agent and water reducer to be more or less the same, but its folding strength significantly improves, illustrate to mix and add ore deposit powder and flyash can effectively improve concrete folding strength; Identical proportioning but do not add the concrete of sodium sulfate exciting agent, its short-term and long-term anti-folding, ultimate compression strength are all less than the concrete mixed and add sodium sulfate exciting agent, illustrate that the intensity of slag and flyash is played and has irreplaceable effect by sodium sulfate exciting agent; Concrete density is big, and resistance of chloride ion penetration can be good, and dry shrinkage is little, and concrete durability is good.

Claims (8)

1. a large dosage ore deposit powder high performance concrete, it is characterized in that being prepared from by cement, slag powders, flyash, rubble, river sand, water, exciting agent and water reducer, count by weight: cement 140��170 parts, slag powders 170��240 parts, 50��100 parts, flyash, rubble 1010��1100 parts, 735��825 parts, river sand, 150��180 parts, water, exciting agent 11��15 parts, water reducer 3.4��5 parts;

In described concrete, gelling material is made up of ordinary Portland cement, slag powders and flyash, and slag powders accounts for the 50��60% of gelling material total mass, and flyash quality is the 15��30% of gelling material total mass.

2. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described slag powders is the S95 level ore deposit powder that median size 2.36��4.75mm, specific surface area are not less than 400/kg.

3. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described flyash is that 45 ��m of square hole sieves tail over and are not more than 12%, and loss on ignition is not more than the I level flyash of 5%.

4. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described rubble is 5��25mm continuous grading rubble.

5. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described river sand is the middle sand that level is joined.

6. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described exciting agent is sodium sulfate exciting agent.

7. large dosage ore deposit powder high performance concrete as claimed in claim 1, it is characterised in that described water reducer is the composite sodium lignosulfonate of high-efficiency water-reducing agent of poly-carboxylic acid; To be specially in 20wt% polycarboxylate water-reducer solution composite enters 3��5wt% lignosulfonic acid sodium solution, and lignosulfonic acid na concn is 45wt%.

8. the preparation method of large dosage ore deposit powder high performance concrete described in claim 1, it is characterised in that comprise the following steps:

Adding in stirrer by cement, slag powders, flyash, rubble, river sand, dry mixing 30��40min is until evenly; In stirrer, add water, exciting agent and water reducer, stir 10��15min, obtain large dosage ore deposit powder high performance concrete.