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Lightweight concrete compositions

A technology for lightweight concrete and composition, applied in the field of new compositions, can solve the problems of inability to achieve physical properties, inconsistent physical properties, reducing the strength and structural integrity of lightweight concrete compositions, etc.

Inactive Publication Date: 2008-12-03
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the prior art assumes that expanded polymer particles will reduce the strength and / or structural integrity of lightweight concrete compositions
Furthermore, concrete products made from prior art lightweight concrete compositions have at least inconsistent physical properties compared to the present invention, such as Young's modulus, thermal conductivity and compressive strength, which typically show unattainable desired physical properties

Method used

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  • Lightweight concrete compositions
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] Polystyrene (M97BC-0.65mm, F271T-0.4mm, and F271M-0.33mm) in the form of unexpanded beads was pre-expanded into EPS foam (pre-expanded) particles with different densities as shown in the table below.

[0159]

[0160] The data shows that the size of the pre-expanded particles is inversely proportional to the expanded density of the material.

Embodiment 2

[0162] Polystyrene (0.65mm, 0.4mm and 0.33mm) in the form of unexpanded beads is pre-expanded to a bulk density of 2lb / ft as shown in the table below 3 Of pre-expanded particles. The pre-expanded particles were formulated into an LWC composition in a 3.5 cubic foot drum mixer, the composition including 46.5wt.% (25.3vol.%) Portland cement, 16.3wt.% (26.3vol.%) Water, and 1.2wt.% (26.4vol.%) of pre-expanded particles. The concrete density of the prepared LWC composition is 90 lb / ft 3 . The average compressive strength (determined in accordance with the 7-day destruction test in ASTM C39) is shown in the table below.

[0163]

[0164] The data shows that at a constant pre-expanded particle density, when the average particle size of the unexpanded beads is reduced, it does not produce a relatively high compressive strength by reducing the particle size of the unexpanded beads as proposed in the prior art. . More specifically, the data shows that when loading to obtain a concrete de...

Embodiment 3

[0166] Since the density of pre-expanded particles can also affect the density of the entire concrete, changing the density of EPS requires changing the filling amount of EPS to maintain a stable concrete density. This relationship is only valid when the total amount of pre-expanded particles is not large and does not affect the strength around the concrete matrix. The relationship between the density of the pre-expanded particles and the amount of filling provides an opportunity to optimize the strength of the concrete when controlling the density of the entire concrete.

[0167] Polystyrene (0.65 mm) in the form of unexpanded beads was pre-expanded into pre-expanded particles with different densities as shown in the table below. The pre-expanded granules were formulated into an LWC composition containing the components shown in the following table in a 3.5 cubic foot drum mixer, and the density of each concrete was 90 lb / ft 3 .

[0168] Sample A

Sample B

Sampl...

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PUM

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Abstract

A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g / cc to 0.64 g / cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, road beds and other articles.

Description

1. Technical Field [0001] The present invention relates to a new composition, a new material, and its use and manufacturing method, which are generally represented in the field of construction and construction. More specifically, the compound of the present invention is suitable for construction and construction applications that can benefit from materials that are relatively lightweight, extensible, moldable, pourable, and have high strength and enhanced insulation properties. . 2. Background technology [0002] For example, in the preparation and application of lightweight cementitious materials called lightweight concrete, these materials currently available on the market usually require the addition of multiple components to make a strong and lightweight concrete body, and in the entire Each component in the concrete body is highly evenly dispersed and evenly bonded. [0003] US patents US 3,214,393, US 3,257,338 and US 3,272,765 disclose concrete mixtures containing cement, ...

Claims

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Application Information

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IPC IPC(8): C04B16/08C04B24/16C04B28/02
Inventor T·古瓦拉M·T·威廉姆斯D·A·科万J·K·麦迪什K·爱德瓦尔R·莫里T·B·希尔曼
Owner NOVA CHEM (INT) SA
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