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Process for preparing high-strength light aggregate concrete

A lightweight aggregate concrete and lightweight aggregate technology, which is applied in the field of building materials, can solve the problems of increasing water absorption, reducing the bonding performance of the interface between lightweight aggregate and cement stone, and being unfavorable for pumping construction.

Inactive Publication Date: 2004-04-28
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0002] Lightweight aggregate concrete has the characteristics of light weight, durability, energy saving, and environmental protection. It has broad application prospects in high-rise buildings and long-span structural engineering. However, the strength of lightweight aggregate concrete is low, and the highest strength level for practical engineering applications is only It is LC60, and the pumping construction performance is poor, it is difficult to meet the strength and construction performance requirements of large-scale projects, which limits the application of light aggregate concrete to a large extent
The main reason for the above problems is that the particle strength of the lightweight aggregate itself is low, and its water absorption increases significantly under pressure, which easily leads to pump blockage.
In view of the above problems, at present, the method of low water absorption light aggregate or surface glaze treatment is mainly used to realize pumping construction, but the water absorption of low water absorption light aggregate still increases greatly under the action of pump pressure, so it is not effective. Improving the Pumping Performance of Light Aggregate Concrete
Although the glazing treatment on the surface of light aggregate can effectively reduce the water absorption rate of light aggregate and improve the pumping performance, but the glazing treatment will reduce the interfacial bonding performance between light aggregate and cement stone; In terms of technical measures for concrete strength, mainly through adding silica fume, using high-grade cement, increasing the amount of cement, etc., but the above methods not only increase the cost, but also reduce the workability of concrete, so it is even more unfavorable for pumping construction
Although the use of high-strength lightweight aggregates can effectively increase the strength of concrete, at present, the particle strength of high-strength lightweight aggregates is mainly 6.0-8.0MPa, so it is difficult to prepare high-strength lightweight aggregate concrete above LC60 with good working performance

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation method of high-strength lightweight aggregate concrete is realized by following steps:

[0034] 1. Raw material preparation:

[0035] Light aggregate: particle size 5-20mm, apparent density 1200-1500kg / m 3 , bulk density 700-1100kg / m 3 , cylinder compressive strength 3-8MPa),

[0036] Cement: 42.5, 52.5 ordinary silicon cement (or Portland cement, slag cement, fly ash cement, specific surface area 500m 2 / kg),

[0037] Fine aggregate: sand (river sand, fineness modulus 2.4-3.1),

[0038] Fly ash: specific surface area 500m 2 / kg,

[0039] Silica fume: the content of active silica is more than 90%,

[0040] Water reducing agent FDN: naphthalene sulfonate FDN, water reducing rate of more than 20%,

[0041] Polymer: Water-soluble polyacrylic acid emulsion.

[0042] 2. Pretreatment of light aggregate: a). Preparation of pretreated cement paste. The pretreated cement paste is composed of cement, silica fume and fly ash, water-soluble po...

Embodiment 2

[0049] Embodiment 2: the preparation method of high-strength lightweight aggregate concrete is realized by following steps:

[0050] 1. Raw material preparation:

[0051] Light aggregate: particle size 5-20mm, apparent density 1200-1500kg / m 3 , bulk density 700-1100kg / m 3 , cylinder compressive strength 3-8MPa),

[0052] Cement: 42.5, 52.5 ordinary silicon cement (or Portland cement, slag cement, fly ash cement, specific surface area 500m 2 / kg),

[0053] Fine aggregate: sand (river sand, fineness modulus 2.4-3.1),

[0054] Fly ash: specific surface area 500m 2 / kg,

[0055] Silica fume: the content of active silica is more than 90%,

[0056] Water reducing agent FDN: naphthalene sulfonate FDN, water reducing rate of more than 20%,

[0057] Polymer: Water-soluble polyacrylic acid emulsion.

[0058] 2. Pretreatment of light aggregate: a). Preparation of pretreated cement paste. The pretreated cement paste is composed of cement, silica fume and fly ash, water-soluble po...

Embodiment 3

[0065] Embodiment 3: the preparation method of high-strength lightweight aggregate concrete is realized by the following steps:

[0066] 1. Pretreatment of light aggregate: a). Preparation of pretreated cement paste. The pretreated cement paste is composed of cement, silica fume, water-soluble polyacrylic acid emulsion, water reducer FDN, and water. The parts by weight of each component are for:

[0067] Cement 1.35, silica fume 0.20, water-soluble polyacrylic acid emulsion (cement content %) 8, naphthalene sulfonate FDN series high-efficiency water reducer (cement content %) 0.3, water 1, mix the above components evenly to make pretreatment cement paste;

[0068] b). Put the light aggregate into the above-mentioned pretreated cement slurry and stir for 2 minutes, then take it out, and maintain it for 2 days at a relative humidity of 90±5% and a temperature of 20±3°C, and set it aside for use;

[0069] 2. Preparation of lightweight aggregate concrete: high-strength lightweig...

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Abstract

The high strength and light aggregate concrete features the preparation process including the step of pre-treatment of light aggregate and the step of preparing light aggregate concrete. The step of pre-treatment includes preparing pre-treated cement slurry with cement, superfine admixture, water soluble polyacrylic acid emulsion, water reducer FDN and water; and mixing light aggregate with the cement slurry via stirring for 1-3 min and curing at 85-95 % humidity and 17-23 deg.c temperature for 1-3 days. The step of preparing light aggregate concrete is mixing the pre-treated light aggregate, cement, fine aggregate, silica ash, water reducer FDN and water in certain proportion to obtain the product. The present invention can raise the strength of light aggregate, lower water absorption rate, increase the strength of light aggregate concrete and improve the pumping and construction performance of light aggregate concrete.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of light aggregate concrete, which can effectively increase the strength of light aggregate particles, reduce water absorption, significantly increase the strength of light aggregate concrete and improve the pumping performance of light aggregate concrete . Background technique [0002] Lightweight aggregate concrete has the characteristics of light weight, durability, energy saving, and environmental protection. It has broad application prospects in high-rise buildings and long-span structural engineering. However, the strength of lightweight aggregate concrete is low, and the highest strength level for practical engineering applications is only It is LC60, and the pumping construction performance is poor, it is difficult to meet the strength and construction performance requirements of large-scale projects, which limits the application of light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/04C04B18/08C04B28/02
CPCY02W30/91
Inventor 胡曙光丁庆军王发洲吕林女姜从盛任飞叶家军彭波陈友治
Owner WUHAN UNIV OF TECH
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