Green environment-friendly light-weight high-strength powder concrete

Abstract

The invention relates to the technical field of concrete, and particularly relates to green environment-friendly light-weight high-strength powder concrete which is prepared from the following raw materials in parts by mass: 550-650 parts of silicate cement, 125-150 parts of silica fume, 90-115 parts of fly ash, 110-130 parts of ore powder, 650-800 parts of shale ceramsite sand, 21-26 parts of high-efficiency water reducing agent and 105-130 parts of water. According to the invention, metal fibers, quartz sand and other high-cost raw materials are eliminated by means of the powder concrete accumulation principle; and the light-weight ultrahigh-strength powder concrete of which the volume weight is 1950kg / m<3> or below is obtained by introducing the high-strength ceramsite sand.

Description

technical field

[0001] The invention relates to the technical field of concrete, and more specifically relates to a green, environment-friendly, lightweight and high-strength powder concrete. Background technique

[0002] Lightweight concrete has been studied for many years at home and abroad, but the highest strength of lightweight concrete has been maintained below 70 MPa, and the bulk density is basically close to 2000kg / m 3 Next, due to its light weight, thermal insulation, sound insulation and other effects, it is widely used in modern energy-saving buildings. However, due to the development of modern urbanization, the bearing capacity required by concrete buildings is getting higher and higher, and the application in many high-strength prefabricated buildings is still greatly limited.

[0003] Active powder concrete is a new type of concrete material with ultra-high strength, high toughness, high durability and stable volume developed by Western countries such as Fran...

Examples

Embodiment 1

[0050] Prepare concrete raw materials according to the following proportions:

[0051] 600 parts of Portland cement with an average particle size of 40 μm and above grade 42.5;

[0052] Average particle size 0.2μm, SiO 2 138 parts of silica fume with content ≥85%;

[0053] 103 parts of Class I fly ash with an average particle size of 30 μm;

[0054] 120 parts of mineral powder above grade S95 with an average particle size of 20 μm;

[0055] 725 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder compressive strength of not less than 6 MPa;

[0056] 23.5 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0057] 118 parts of water;

[0058] After the preparation of the above raw materials is completed, the stirring preparation is carried out according to the following steps:

[0059] (1) Soak the shale pottery sand in water for one hour, then dra...

Embodiment 2

[0073] Prepare raw materials according to the following proportions:

[0074] 550 parts of Portland cement above grade 42.5 with an average particle size of 30 μm;

[0075] Average particle size 0.1μm, SiO 2 125 parts of silica fume with content ≥85%;

[0076] 90 parts of Class I fly ash with an average particle size of 10 μm;

[0077] 110 parts of mineral powder above S95 grade with an average particle size of 10 μm;

[0078] 800 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder crushing compressive strength of not less than 6 MPa;

[0079] 21 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0080] 105 parts of water.

[0081] The preparation steps are the same as in Example 1.

[0082] The performance of the product prepared in this embodiment is as follows:

[0083] Compressive strength: 112MPa;

[0084] Flexural strength: 10.6MPa;

...

Embodiment 3

[0091] 650 parts of Portland cement above grade 42.5 with an average particle size of 60 μm;

[0092] Average particle size 0.8μm, SiO 2 150 parts of silica fume with content ≥85%;

[0093] 115 parts of Class I fly ash with an average particle size of 30 μm;

[0094] 130 parts of mineral powder above S95 grade with an average particle size of 50 μm;

[0095] 650 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder crushing compressive strength of not less than 6 MPa;

[0096] 26 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0097] 130 parts of water.

[0098] The preparation steps are the same as in Example 1.

[0099] The performance of the product prepared in this embodiment is as follows:

[0100] Compressive strength: 127MPa;

[0101] Flexural strength: 11.4MPa;

[0102] Elastic modulus: 40GPa;

[0103] Impermeability performance: ≥P...

technical field

[0001] The invention relates to the technical field of concrete, and more specifically relates to a green, environment-friendly, lightweight and high-strength powder concrete. Background technique

[0002] Lightweight concrete has been studied for many years at home and abroad, but the highest strength of lightweight concrete has been maintained below 70 MPa, and the bulk density is basically close to 2000kg / m 3 Next, due to its light weight, thermal insulation, sound insulation and other effects, it is widely used in modern energy-saving buildings. However, due to the development of modern urbanization, the bearing capacity required by concrete buildings is getting higher and higher, and the application in many high-strength prefabricated buildings is still greatly limited.

[0003] Active powder concrete is a new type of concrete material with ultra-high strength, high toughness, high durability and stable volume developed by Western countries such as Fran...

Examples

Embodiment 1

[0050] Prepare concrete raw materials according to the following proportions:

[0051] 600 parts of Portland cement with an average particle size of 40 μm and above grade 42.5;

[0052] Average particle size 0.2μm, SiO 2 138 parts of silica fume with content ≥85%;

[0053] 103 parts of Class I fly ash with an average particle size of 30 μm;

[0054] 120 parts of mineral powder above grade S95 with an average particle size of 20 μm;

[0055] 725 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder compressive strength of not less than 6 MPa;

[0056] 23.5 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0057] 118 parts of water;

[0058] After the preparation of the above raw materials is completed, the stirring preparation is carried out according to the following steps:

[0059] (1) Soak the shale pottery sand in water for one hour, then dra...

Embodiment 2

[0073] Prepare raw materials according to the following proportions:

[0074] 550 parts of Portland cement above grade 42.5 with an average particle size of 30 μm;

[0075] Average particle size 0.1μm, SiO 2 125 parts of silica fume with content ≥85%;

[0076] 90 parts of Class I fly ash with an average particle size of 10 μm;

[0077] 110 parts of mineral powder above S95 grade with an average particle size of 10 μm;

[0078] 800 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder crushing compressive strength of not less than 6 MPa;

[0079] 21 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0080] 105 parts of water.

[0081] The preparation steps are the same as in Example 1.

[0082] The performance of the product prepared in this embodiment is as follows:

[0083] Compressive strength: 112MPa;

[0084] Flexural strength: 10.6MPa;

...

Embodiment 3

[0091] 650 parts of Portland cement above grade 42.5 with an average particle size of 60 μm;

[0092] Average particle size 0.8μm, SiO 2 150 parts of silica fume with content ≥85%;

[0093] 115 parts of Class I fly ash with an average particle size of 30 μm;

[0094] 130 parts of mineral powder above S95 grade with an average particle size of 50 μm;

[0095] 650 parts of shale pottery sand with a continuously graded particle size of 0.16-4.75mm, a water absorption rate of less than 5%, and a cylinder crushing compressive strength of not less than 6 MPa;

[0096] 26 parts of high-efficiency water reducing agent with water reducing rate greater than 30%;

[0097] 130 parts of water.

[0098] The preparation steps are the same as in Example 1.

[0099] The performance of the product prepared in this embodiment is as follows:

[0100] Compressive strength: 127MPa;

[0101] Flexural strength: 11.4MPa;

[0102] Elastic modulus: 40GPa;

[0103] Impermeability performance: ≥P...