CN104803645A - High-strength light-weight concrete and preparation method thereof - Google Patents

Abstract

The invention relates to high-strength light-weight concrete and a preparation method thereof. The preparation method comprises the following steps: step 1, ceramsites and pottery sand which are included in the raw material formula of the high-strength light-weight concrete are soaked in water to fully absorb water; step 2, adding the ceramsites and pottery sand absorbed with water and the rest of materials to a stirring machine, stirring for 3 min to obtain a high-strength light-weight concrete mixture. The high-strength light-weight concrete in the raw material formula comprises the following raw materials in percentage by weight: 18-27% of portland cement, 6-10% of vitrified microspheres, 2-6% of silica fume, 20-30% of ceramsites, 25-35% of pottery sand, 0.2-0.8% of a high-performance water reducing agent, 0.05-0.3% of molecular sieves, 0.05-0.8% of an air entraining agent and 8-12% of water. According to the high-strength light-weight concrete and the preparation method thereof, provided by the invention, through the combined action of the adopted molecular sieves and the air entraining agent, a large number of air holes causing little influence on the strength is introduced into the concrete, the unit weight of the high-strength light-weight concrete is reduced, the application range of the high-strength light-weight concrete is expanded, the possibility that aggregate in the concrete tends to float upwards due to density variation can be greatly reduced under the existence of the air holes.

Description

A kind of light high strength concrete and preparation method thereof

Technical field

The present invention relates to a kind of light high strength concrete and preparation method thereof, belong to building material field.

Background technology

Light high strength concrete (HSLC) has high-strength light, good endurance, without alkali-aggregate reaction, the advantage such as volume stability is good, thermal and insulating performance is good, has been widely used in overseas in the engineerings such as extra large work structures, Highrise buildings, Longspan Bridge and urban interchange.

The gordian technique preparing high-strength light how to obtain the aglite that density is little, intensity is high, and along with the development of modern science and technology, some novel aggregates such as Silica hydrogel are applied in light high strength concrete by trial.As everyone knows, gas is the aggregate that a kind of density is the lightest, but the excessive meeting in bubble aperture causes concrete strength significantly to be decayed.

Summary of the invention

The object of the invention is to provide a kind of light high strength concrete and preparation method thereof.

For achieving the above object, the first technical scheme that the present invention adopts is: a kind of light high strength concrete, and the composition of raw materials of described high-strength light coagulation comprises the material of following masses percentage composition:

Silicate cement 18 ~ 27%;

Glass bead 6 ~ 10%;

Silicon ash 2 ~ 6%;

Haydite 20 ~ 30%;

Pottery sand 25 ~ 35%;

High-performance water reducing agent 0.2 ~ 0.8%;

Molecular sieve 0.05 ~ 0.3%;

Air entrapment agent 0.05 ~ 0.8%;

Water 8 ~ 12%.

Preferred technical scheme is: described silicate cement select grade be 52.5 ordinary Portland cement.

Preferred technical scheme is: the particle size range of described glass bead is 10 ~ 50nm.

Preferred technical scheme is: the specific surface area of described silicon ash is more than or equal to 25000m ²the silicon ash of/kg, and SiO ₂content is more than or equal to 94%.

Preferred technical scheme is: described haydite is broken stone type haydites of book structure, and its particle diameter is 5 ~ 16mm, cylindrical compress strength is 8.9Mpa.

Preferred technical scheme is: described molecular sieve is 13x molecular sieve, silica alumina ratio: SiO ₂/ AL ₂o ₃=2.6 ~ 3.0.

Preferred technical scheme is: described air entrapment agent is triterpenoid saponin.

For achieving the above object, the first technical scheme that the present invention adopts is: a kind of method preparing light high strength concrete, comprises the following steps:

The first step: the haydite in described high-strength light coagulation composition of raw materials and pottery sand are soaked in water and makes it fully absorb water;

Second step: the haydite after fully absorbing water is added in stirrer with pottery sand together with remaining material in described high-strength light coagulation composition of raw materials, stirs after 3 minutes and namely obtain light high strength concrete mixture.

Because technique scheme is used, the present invention compared with prior art has following advantages and effect:

The present invention adopts molecular sieve and air entrapment agent acting in conjunction in concrete, introduce a large amount of micro-pore little to intensity effect, the unit weight of further reduction light high strength concrete, promote the range of application of light high strength concrete, the existence of a large amount of micro-pore also significantly can reduce the rising phenomenon of aggregate in concrete caused because of density variation.

Embodiment

Below in conjunction with embodiment, the invention will be further described.

Embodiment one: a kind of light high strength concrete and preparation method thereof.

A kind of light high strength concrete, composition of raw materials comprises the material of following masses percentage composition:

Gelling material: PO52.5 cement (grade is the ordinary Portland cement of 52.5) 20%; Glass bead 10%; Silicon ash 5%; Wherein, glass bead, silicon ash belong to low density gelling material.The particle size range of glass bead is 10 ~ 50nm.The specific surface area of described silicon ash is 25000m ²the silicon ash of/kg, and SiO ₂content is 94%;

Aggregate: haydite 25%; Pottery sand 30%.Described haydite is broken stone type haydites of book structure, and its particle diameter is 5 ~ 16mm, cylindrical compress strength is 8.9Mpa, its density rating 900;

Water reducer: Suzhou Fu Ke high performance water reducing agent of polyocarboxy acid that Science and Technology Ltd. produces 0.4%;

Molecular sieve: 13x molecular sieve 0.1%, silica alumina ratio: SiO ₂/ AL ₂o ₃=2.6 ~ 3.0;

Air entrapment agent: triterpenoid saponin 0.05%;

Water: 9.45%.

The preparation technology of above-mentioned light high strength concrete is as follows:

(1), by haydites of book structure, pottery sand in water, soak 24h, make its fully full water;

(2), the haydite after full water is added in stirrer with pottery sand together with other materials; Stir 3 minutes i.e. obtained light high strength concrete mixtures.

By the light high strength concrete obtained by embodiment 1, its every physical and mechanical property index is as shown in the table: concrete testing method is according to following standard: lightweight aggregate concrete technology code JGJ51-2002, standard for test methods of mechanical properties of ordinary concrete GB/T50081-2002, Standard for test methods of properties of ordinary concrete mixture standard GB/T50081-2002.(compared with benchmark, benchmark is the light high strength concrete not adding air entrapment agent and molecular sieve)

	The slump (mm)	Divergence (mm)	Segregation situation	Dry apparent density (Kg/m3)	28d ultimate compression strength (MPa)
						Benchmark	200	500	Aggregate obviously floats	1650	55.1
Embodiment 1	220	600	Have no segregation	1540	55.2

The present embodiment adopts triterpenoid saponin as air entrapment agent, with the molecular sieve acting in conjunction that specification is 13X, generate the harmless hole of a large amount of particle diameter at below 5nm, do not falling under low intensive prerequisite, reduce concrete unit weight, and improve concrete workability, reduce the segregation phenomenon of light high strength concrete.

Embodiment two: a kind of light high strength concrete and preparation method thereof.

The composition of raw materials of described high-strength light coagulation comprises the material of following masses percentage composition:

Silicate cement 18%;

Glass bead 10%;

Silicon ash 6%;

Haydite 25%;

Pottery sand 30%;

High-performance water reducing agent 0.5%;

Molecular sieve 0.1%;

Air entrapment agent 0.5%;

Water 9.9%.

Preparation method is with embodiment one.

Embodiment three: a kind of light high strength concrete and preparation method thereof.

The composition of raw materials of described high-strength light coagulation comprises the material of following masses percentage composition:

Silicate cement 27%;

Glass bead 6%;

Silicon ash 3%;

Haydite 20%;

Pottery sand 34%;

High-performance water reducing agent 0.8%;

Molecular sieve 0.3%;

Air entrapment agent 0.8%;

Water 8.1%.

Preparation method is with embodiment one.

Embodiment four: a kind of light high strength concrete and preparation method thereof.

The composition of raw materials of described high-strength light coagulation comprises the material of following masses percentage composition:

Silicate cement 20%;

Glass bead 8%;

Silicon ash 3%;

Haydite 30%;

Pottery sand 28%;

High-performance water reducing agent 0.4%;

Molecular sieve 0.1%;

Air entrapment agent 0.2%;

Water 10.3%.

Preparation method is with embodiment one.

Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.

Claims (8)

1. a light high strength concrete, is characterized in that: the composition of raw materials of described high-strength light coagulation comprises the material of following masses percentage composition:

Silicate cement 18 ~ 27%;

Glass bead 6 ~ 10%;

Silicon ash 2 ~ 6%;

Haydite 20 ~ 30%;

Pottery sand 25 ~ 35%;

High-performance water reducing agent 0.2 ~ 0.8%;

Molecular sieve 0.05 ~ 0.3%;

Air entrapment agent 0.05 ~ 0.8%;

Water 8 ~ 12%.

2. light high strength concrete according to claim 1, is characterized in that: described silicate cement select grade be 52.5 ordinary Portland cement.

3. light high strength concrete according to claim 1, is characterized in that: the particle size range of described glass bead is 10 ~ 50nm.

4. light high strength concrete according to claim 1, is characterized in that: the specific surface area of described silicon ash is more than or equal to 25000m ²the silicon ash of/kg, and SiO ₂content is more than or equal to 94%.

5. light high strength concrete according to claim 1, is characterized in that: described haydite is broken stone type haydites of book structure, and its particle diameter is 5 ~ 16mm, cylindrical compress strength is 8.9Mpa.

6. light high strength concrete according to claim 1, is characterized in that: described molecular sieve is 13x molecular sieve, silica alumina ratio: SiO ₂/ AL ₂o ₃=2.6 ~ 3.0.

7. light high strength concrete according to claim 1, is characterized in that: described air entrapment agent is triterpenoid saponin.

8. prepare a method for light high strength concrete described in the arbitrary claim of claim 1 ~ 7, it is characterized in that: comprise the following steps:

The first step: the haydite in described high-strength light coagulation composition of raw materials and pottery sand are soaked in water and makes it fully absorb water;

Second step: the haydite after fully absorbing water is added in stirrer with pottery sand together with remaining material in described high-strength light coagulation composition of raw materials, stirs after 3 minutes and namely obtain light high strength concrete mixture.