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Lightweight aggregate non-fine concrete and preparation method thereof

A sand-free concrete and lightweight aggregate technology, which is applied in the field of building materials, can solve the problems of concrete stability reduction and achieve the effects of reducing concrete stability reduction, designability, and lower use costs

Inactive Publication Date: 2017-01-04
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides a lightweight aggregate sand-free concrete and its preparation method, which combines lightweight aggregate concrete, high strength, heat preservation, fire resistance, frost resistance, low heat transfer, good shock resistance and no Sand concrete has the characteristics of air permeability, water permeability and light weight, which can solve the problem of reduced stability of concrete due to the need to add modified functional materials to fine aggregate when using lightweight aggregate concrete. The material has better durability and greatly The use cost of concrete is reduced, and due to the reduction of self-weight, the structural bearing capacity can be improved, and the anti-seismic vibration isolation system is more superior and more designable

Method used

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  • Lightweight aggregate non-fine concrete and preparation method thereof

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preparation example Construction

[0021] The preparation method all adopts the preparation method disclosed in the present application, namely:

[0022] S1, take each raw material by the formula described in Table 1;

[0023] S2. Before the preparation of lightweight aggregate sand-free concrete, soak the weighed lightweight aggregate in a container for 24 hours to absorb water so that the lightweight aggregate is saturated with water, then take it out and let the internal pores of the lightweight aggregate reach the saturation level Dry;

[0024] S3. Mix 40%-50% of the weighed amount of cement, 45%-60% of the weighed amount of water and all the polycarboxylate water reducer, and stir for 50-60s to form a cement slurry;

[0025] S4. Add all the lightweight aggregates to the formed cement paste, add the remaining cement and water after stirring for 40-50s, put it into the mixer and stir for 120s to form a lightweight aggregate sand-free concrete paste;

[0026] S5. Add the obtained lightweight aggregate sand-...

Embodiment 1

[0028] Using lightweight aggregate with a particle size of 5cm and polycarboxylate superplasticizer with a water reducing rate of 20%, the lightweight aggregate sand-free concrete made in this example has a bulk density of 1960kg / m 3 , 500kg / m2 less bulk density than concrete with the same performance 3 above. The total porosity of the lightweight aggregate sand-free concrete is 15.6%, the effective porosity is 12.8%, the permeability coefficient is 1.1cm / s, and the compressive strength at 28 days is 68.1MPa.

Embodiment 2

[0030] Using lightweight aggregate with a particle size of 10cm and polycarboxylate superplasticizer with a water reducing rate of 25%, the lightweight aggregate sand-free concrete made in this example has a bulk density of 1920kg / m 3 , 500kg / m2 less bulk density than concrete with the same performance 3 above. The total porosity of the lightweight aggregate sand-free concrete is 16.2%, the effective porosity is 14.2%, the permeability coefficient is 1.3cm / s, and the compressive strength at 28 days is 66.7MPa.

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Abstract

The invention discloses a lightweight aggregate non-fine concrete and a preparation method thereof. The non-fine concrete is prepared from the following raw materials in proportion by mass: the proportion of cement, coal ash, lightweight aggregate, water to a water reducing agent is equal to 1: (0.00-0.1): (1.50-1.65): (0.25-0.35): (0.008-0.01). The lightweight aggregate non-fine concrete prepared in the invention combines the advantages of lightweight aggregate concrete and non-fine concrete, so that the lightweight aggregate non-fine concrete has the characteristics of light weight, high strength, heat preservation, fire resistance, frost resistance and low heat conductivity, particularly good water permeability and excellent earthquake resistance; and therefore, according to the concrete, the water permeability of a drainage body is enlarged in the construction of a urban drainage system, the noise is reduced, and the earthquake-proof and vibration-isolated system is more superior and has preferable designability.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a lightweight aggregate sand-free concrete and a preparation method thereof. Background technique [0002] Concrete is a commonly used building material, and in the context of increasingly severe global environmental problems, the development of new green concrete materials to reduce the negative effects of the environment is an urgent problem to be solved. At present, when lightweight aggregate concrete is used, the fine aggregate includes organic salt-modified lightweight silicon-manganese slag and ordinary extra-fine sand. When using it, it is necessary to add special materials with modification functions. After adding special materials, it will Increasing the amount of water or reacting with lightweight aggregate will reduce the stability of concrete and increase the cost of concrete use. Due to the presence of more pores in sand-free concrete materials, it can expand the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B18/08C04B14/02C04B22/002C04B2103/302
Inventor 周凤玺马强王根强
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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