High-strength and high performance lightweight aggregate and preparation method thereof

A high-performance, lightweight aggregate technology, applied in the fields of ceramic products, climate sustainability, and other household appliances, can solve the problems of difficulty in preparing ultra-high-strength lightweight aggregate concrete, high energy consumption, high power consumption, and low cylinder compressive strength and other problems, to achieve the effect of low production cost, low water absorption and low energy consumption

Active Publication Date: 2009-06-17

CHINA STATE CONSTR READY MIXED CONCRETE CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

However, due to the generally low cylinder compressive strength (7...

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Abstract

The invention belongs to the field of inorganic non-metallic material, and in particular relates to a light aggregate with high strength and high performance and a preparation method thereof. The light aggregate with high strength and high performance is characterized in that the light aggregate is prepared from solid raw materials and water glass solution, and the mass ratio of the water glass solution to the solid raw materials is 0.3-0.8:1, wherein the solid raw materials consist of metakaolin, steel slag, coal ash, mineral slag and foaming agent; each raw material in the solid raw materials by mass percentage comprises: 30 to 99.9 percent of the metakaolin, 0 to 30 percent of the steel slag, 0 to 50 percent of the coal ash, 0 to 70 percent of the mineral slag, and 0.1 to 0.5 percent of the foaming agent; and the sum of the each raw material in the solid raw materials by mass percentage is 100 percent. The method has the advantages of simple process and low production cost; and the light aggregate with high strength and high performance prepared by the method has the characteristic of high cylinder pressing strength.

Application Domain

Solid waste managementCement production +1

Technology Topic

MetakaolinSlag +7

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Examples

Experimental program(8)

Example Embodiment

[0029] Example 1:

[0030] A high-strength and high-performance lightweight aggregate, which is prepared from solid raw materials and sodium water glass solution, and the mass ratio of sodium water glass solution (also known as sodium water glass) to solid raw materials is 0.65:1; The raw material is composed of metakaolin and gas-generating agent raw materials. The mass percentages of metakaolin and gas-generating agent in the solid raw material are: metakaolin 99.75% and gas-generating agent 0.25%.

[0031] The metakaolin is a commercially available coal-based kaolin, obtained by calcining at 700° C. for 7 hours; the gas-generating agent is aluminum powder; the modulus of the sodium water glass is 1.5, and the Baumé degree is 40.

[0032] The preparation method of the above-mentioned high-strength and high-performance lightweight aggregate comprises the following steps:

[0033] 1) According to the mass percentage of each raw material in the solid raw material: metakaolin 99.75%, aluminum powder 0.25%, select metakaolin and aluminum powder raw materials for standby;

[0034] According to the mass ratio of sodium water glass solution and solid raw material to be 0.65:1, select sodium water glass solution and solid raw material;

[0035] 2) Mix the selected metakaolin and aluminum powder raw materials evenly to obtain solid raw materials (powder);

[0036] 3) adding the sodium water glass solution to the solid raw material, and fully stirring to obtain a slurry;

[0037] 4) Pour the slurry into a flat mold with a thickness of 50mm, release the mold after natural curing, and place it under the conditions of 20±2°C and 95±5% relative humidity for curing for 3d (days) to obtain a hardened body;

[0038] 5) Use a crusher to crush the hardened body to a semi-finished product with a particle size of 5-25 mm;

[0039] 6) Soak the semi-finished product in a circulating weak acid solution for 10 hours, the weak acid solution is dilute hydrochloric acid with pH=5, and then rinsed with clean water, dried, sieved, and stacked to obtain a high-strength and high-performance lightweight aggregate product.

[0040] The performance index of the obtained light aggregate is tested according to GB/T17431-1998, and the bulk density is 852kg/m 3 , the water absorption rate is 2.4%, and the cylinder compressive strength is 15.6MPa. Cylinder compressive strength is an important index reflecting the mechanical properties of lightweight aggregates (physical quantities reflecting the mechanical properties of lightweight aggregates). , the pressure value at this time is taken as the strength value of the light aggregate.

[0041] The prepared lightweight aggregate is used to form concrete according to the mix ratio shown in Table 1, and its performance indicators are shown in Table 1.

[0042] Table 1 Mix ratio and performance index of lightweight aggregate concrete

[0043]

[0044] Preparation of lightweight aggregate concrete raw materials:

[0045] Cement: P.O 52.5 cement;

[0046] Fly ash: Class I ash, the water demand ratio is 92%;

[0047] Sand: river sand, fineness modulus 2.6;

[0048] Stone: 5-25mm particle size continuously graded crushed stone;

[0049] water: tap water;

[0050] Admixture: polycarboxylic acid superplasticizer.

Example Embodiment

[0051] Example 2:

[0052] A high-strength and high-performance lightweight aggregate, which is prepared from solid raw materials and potassium water glass solution, and the mass ratio of potassium water glass solution to solid raw materials is 0.52:1; wherein, the solid raw materials are composed of metakaolin, steel slag, The composition of fly ash, slag and gas-generating agent raw materials, the mass percentage of metakaolin, steel slag, fly ash, slag, and gas-generating agent in the solid raw materials is: metakaolin 39.7%, steel slag 10%, pulverized coal Ash 20%, slag 30%, gas generating agent 0.3%.

[0053] The metakaolin is a commercially available coal-based kaolin, obtained by calcining at 740°C for 5 hours; the steel slag is the waste slag in the steelmaking production process, with a specific surface area of 4700cm 2 /g; Described fly ash is Class I fly ash; Described slag is granulated blast furnace slag powder, specific surface area 4200cm 2 /g; the gas generating agent is aluminum powder; the modulus of the potassium water glass solution is 1.6, and the Baume degree is 39.

[0054] The preparation method of the above-mentioned high-strength and high-performance lightweight aggregate comprises the following steps:

[0055]1) According to the mass percentage of each raw material in the solid raw materials: metakaolin 39.7%, steel slag 10%, fly ash 20%, slag 30%, aluminum powder 0.3%, select metakaolin, steel slag, fly ash, Slag and aluminum powder raw materials, spare;

[0056] According to the mass ratio of potassium water glass solution (also known as potassium water glass) and solid raw material as 0.52:1, select potassium water glass solution and solid raw material;

[0057] 2) uniformly mixing the selected metakaolin, steel slag, fly ash, slag and aluminum powder raw materials to obtain solid raw materials (powder);

[0058] 3) adding the potassium water glass solution to the solid raw material, fully stirring to obtain a slurry;

[0059] 4) Pour the slurry into a flat mold with a thickness of 60mm, release the mold after natural curing, and place it under the conditions of 20±2°C and 95±5% relative humidity for curing for 7d to obtain a hardened body;

[0060] 5) Use a crusher to crush the hardened body to a semi-finished product with a particle size of 5-30 mm;

[0061] 6) Soak the semi-finished product in a circulating weak acid solution for 12 hours, the weak acid solution is dilute sulfuric acid with pH=6, and then rinsed with clean water, then dried, sieved, and stacked to obtain a high-strength and high-performance light aggregate product.

[0062] The performance index of the obtained light aggregate is tested according to GB/T17431-1998, and the bulk density is 630kg/m 3 , the water absorption rate is 3.6%, and the cylinder compressive strength is 10.8MPa.

[0063] The prepared lightweight aggregate is used to form concrete according to the mix ratio shown in Table 2, and its performance indicators are shown in Table 2.

[0064] Table 2 Mix ratio and performance index of lightweight aggregate concrete

[0065]

[0066] Preparation of lightweight aggregate concrete raw materials:

[0067] Cement: P.O 42.5 cement;

[0068] Fly ash: Class II ash, the water demand ratio is 102%;

[0069] Slag: granulated blast furnace slag powder with a specific surface area of 4100cm 2 /g, the 7-day activity index was 80%, and the 28-day activity index was 102%;

[0070] Sand: river sand, fineness modulus 2.6;

[0071] Stone: 5-25mm particle size continuously graded crushed stone;

[0072] water: tap water;

[0073] Admixture: Polycarboxylic acid superplasticizer.

Example Embodiment

[0074] Example 3:

[0075] A high-strength and high-performance lightweight aggregate is prepared from solid raw materials and potassium water glass solution, and the mass ratio of potassium water glass solution to solid raw material is 0.73:1; wherein, the solid raw material is composed of metakaolin, steel slag and The composition of aluminum powder raw materials, the mass percentages of metakaolin, steel slag and aluminum powder in the solid raw materials are: metakaolin 89.7%, steel slag 10%, aluminum powder 0.3%.

[0076] The metakaolin is a commercially available coal-based kaolin, obtained by calcining at 670°C for 6 hours; the steel slag is the waste slag in the steelmaking production process, with a specific surface area of 4500cm 2 /g; the modulus of the potassium water glass solution is 1.8, and the Baume degree is 41.

[0077] The preparation method of the above-mentioned high-strength and high-performance lightweight aggregate comprises the following steps:

[0078] 1) According to the mass percentage of each raw material in the solid raw material: metakaolin 89.7%, steel slag 10%, aluminum powder 0.3%, select metakaolin, steel slag and aluminum powder raw materials for standby;

[0079] According to the mass ratio of potassium water glass solution and solid raw material to be 0.73:1, select potassium water glass solution and solid raw material;

[0080] 2) uniformly mixing the selected metakaolin, steel slag and aluminum powder raw materials to obtain solid raw materials (powder);

[0081] 3) adding the potassium water glass solution to the solid raw material, fully stirring to obtain a slurry;

[0082] 4) Pour the slurry into a flat mold with a thickness of 80mm, release the mold after natural curing, and place it under the conditions of 20±2°C and 95±5% relative humidity for curing for 7 days to obtain a hardened body;

[0083] 5) The hardened body is crushed by a crusher to a semi-finished product with a particle size of 5-20 mm;

[0084] 6) Soak the semi-finished product in a circulating weak acid solution for 12 hours, the weak acid solution is dilute sulfuric acid with pH=5, and then rinsed with clean water, then dried, sieved, and stacked to obtain a high-strength and high-performance lightweight aggregate product.

[0085] The performance index of the obtained light aggregate is tested according to GB/T17431-1998, and the bulk density is 870kg/m 3 , the water absorption rate is 4.3%, and the cylinder pressure strength is 12.1MPa.

[0086] The prepared lightweight aggregate is used to form concrete according to the mix ratio shown in Table 3, and its performance indicators are shown in Table 3.

[0087] Table 3 Lightweight aggregate concrete mix ratio and performance index

[0088]

[0089] Preparation of lightweight aggregate concrete raw materials:

[0090] Cement: P.O 42.5 cement;

[0091] Slag: granulated blast furnace slag powder with a specific surface area of 4600cm 2 /g, the 7-day activity index was 80%, and the 28-day activity index was 102%;

[0092] Sand: river sand, fineness modulus 2.8;

[0093] Stone: 5-25mm particle size continuously graded crushed stone;

[0094] water: tap water;

[0095] Admixture: Polycarboxylic acid superplasticizer.

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PUM

Property	Measurement	Unit
Bulk density	852.0	kg/m³
Cylinder compressive strength	15.6	MPa
Specific surface area	4700.0	cm²/g
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process
Reduce manufacturing cost

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Reduce energy consumption High strength Good toughness Low water absorption Coal Metallic materials Mass ratio Materials science Raw material Foaming agent Ceramicware

High-strength and high performance lightweight aggregate and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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