Lightweight concrete compositions

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

Inactive Publication Date: 2009-04-08
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
  • Lightweight concrete compositions
  • Lightweight concrete compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] 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.

[0182]

[0183] The data show that the pre-puff particle size is inversely proportional to the expanded density of the material.

Embodiment 2

[0185] Polystyrene in the form of unexpanded beads (0.65mm, 0.4mm and 0.33mm) pre-expanded to a bulk density of 2lb / ft as shown in the table below 3 pre-expanded particles. The pre-expanded pellets were formulated in a 3.5 cubic foot drum mixer into an LWC composition comprising 46.5 wt.% (25.3 vol.%) of Portland cement, 16.3 wt.% (26.3 vol.%) of Water, and 1.2 wt.% (26.4 vol.%) of pre-expanded particles. The resulting LWC composition had a concrete density of 90 lb / ft 3 . The average compressive strength (measured according to the 7-day failure test in ASTM C39) is shown in the table below.

[0186]

[0187] The data show that at a constant pre-expanded particle density, when the average particle size of the unexpanded beads is reduced, it does not necessarily result in a considerably higher compression resistance by reducing the particle size of the unexpanded beads as proposed in the prior art strength. More specifically, the data show that there is an optimum unexp...

Embodiment 3

[0189] Since the density of pre-expanded particles can also affect the density of the whole concrete, changing the density of EPS requires changing the filling amount of EPS to maintain a stable concrete density. This relationship is only valid if the total amount of prepuff particles is not so large as to affect the strength of the surrounding concrete matrix. The relationship between pre-puff particle density and fill level allows the opportunity to optimize the strength of the concrete while controlling the overall concrete density.

[0190] Polystyrene (0.65 mm) in the form of unexpanded beads was pre-expanded into pre-expanded particles having different densities as indicated in the table below. Pre-expanded pellets were formulated in a 3.5 cubic foot drum mixer to LWC compositions containing the components shown in the table below, each concrete having a density of 90 lb / ft 3 .

[0191] Sample A

Sample B

Sample C

Bulk density of pre-expanded p...

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PUM

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Abstract

A lightweight ready-mix concrete composition that contains 8-20 volume percent cement, 11-50 volume percent sand, 10-31 volume percent prepuff particles, 9-40 volume percent coarse aggregate, and 10-22 volume percent water, where the sum of components used does not exceed 100 volume percent. The prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3. The slump value of the composition measured according to ASTM C 143 is from 2 to 8 inches. After the lightweight ready-mix concrete composition is set for 28 days, it has a compressive strength of at least 1400 psi as tested according to ASTM C39.

Description

technical field [0001] The present invention relates to new compositions, new materials and methods of use and manufacture thereof typified in the field of building and construction in general. More specifically, the compounds of the present invention are suitable for building and construction applications that would benefit from relatively lightweight, extensible, moldable, pourable materials with high strength and often enhanced insulation properties in application. Background technique [0002] In the field of preparation and application of lightweight cementitious materials such as lightweight concrete, these now commercially available materials often require the addition of multiple components to produce a strong and lightweight concrete body, and throughout The components in the concrete body are highly uniformly dispersed and evenly bonded. [0003] US Patents US3,214,393, US3,257,338 and US3,272,765 disclose concrete mixtures comprising cement, primary aggregates, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B16/08
CPCC04B2103/67C04B28/04C04B2111/40
Inventor T·G·拉德利M·T·威廉姆斯R·胡戈赫斯M·R·克雷J·K·马蒂施K·范巴斯科克
Owner NOVA CHEM (INT) SA
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