Cementitious composites having wood-like properties and methods of manufacture

A cohesive composition and cohesive technology, applied in the field of cohesive building products and cohesive building materials

Inactive Publication Date: 2009-01-14
E KHASHOGGI INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such flakes are not suitable

Method used

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  • Cementitious composites having wood-like properties and methods of manufacture
  • Cementitious composites having wood-like properties and methods of manufacture
  • Cementitious composites having wood-like properties and methods of manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0197] Various extrudable compositions were prepared in accordance with the present invention having different concentrations of the components. All mixtures were mixed according to the normal mixing procedures described above and in the references incorporated herein. Briefly, the fibrous mixture of fibers, rheology modifier and water was mixed for 1 hour, then the other components were added and mixed for an additional hour. Extrudable compositions were formulated as shown in Tables 1-6.

[0198] Table 1

[0199] substance (wet)

Mixture 1

mixture 2

Mixture 3

Mixture 4

Mixture 5

Mixture 6

fiber type

HW

HW

SW

SW

SW

SW

Fiber w (Fiber w) / water (g)

461

790

933

1227

1627

1755

Portland cement (grams)

910

910

910

910

910

910

Cellulose ether (g)

50

50

50

50

50

50

Starch (grams)

219

219

219

219

219

...

Embodiment 2

[0218] Various extrudable compositions were prepared according to Example 1 with different component concentrations. Extrudable compositions were formulated as shown in Tables 7-8.

[0219] Table 7

[0220]

[0221] Table 8

[0222]

[0223] The cementitious compositions exemplified by Mixtures 1-6 are extruded into building products and cured (eg, by incipient heating). The amounts of each component were then calculated on a dry basis and are provided in Tables 9-10.

[0224] Table 9

[0225]

[0226] Table 10

[0227]

Embodiment 3

[0229] The flexural strength of extruded cementitious building products is tested and compared to wood. More specifically, flexural strength was tested as a function of displacement (inches) versus applied force (lbs). In this way, the displacement of timber (x) is compared with that of unreinforced extruded composites (solid diamonds - ◆ ), glass fiber reinforced extruded building products (solid squares - ), and extruded plain steel bars (steel rebar) reinforced. Comparing the displacement of the building product (solid triangle-▲), as shown in Figure 8. As shown, the displacement of the extruded cementitious building product and wood was similar up to a force of about 275 lbs. Additionally, extruded building products reinforced with fiberglass rebar and conventional rebar exhibit greater displacement than wood under the same force. Thus, extruded bonded building products can be compared to wood with less end force, and steel-reinforced bonded building products actually ha...

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Abstract

A method of manufacturing a cementitious composite includes: (1) forming mixing an extrudable cementitious composition by first forming a fibrous mixture comprising fibers, water and a rheology modifying agent and then adding hydraulic cement; (2) extruding the extrudable cementitious composition into a green extrudate, wherein the green extrudate is characterized by being form-stable and retaining substantially a predefined cross-sectional shape; (3) removing a portion of the water by evaporation to reduce density and increase porosity; and (4) causing or allowing the hydraulic cement to hydrate to form the cementitious composite. Such a process yields a cementitious composite that is suitable for use as a wood substitute. The wood-like building products can be sawed, nailed and screwed like ordinary wood.

Description

Background of the invention [0001] I. Field of Invention [0002] The present invention generally relates to cementitious building products containing reinforcing fibers, and more particularly, the present invention relates to extrudable cementitious compositions useful for preparing cementitious building products having wood-like properties. [0003] II. Related technologies [0004] Lumber and other construction products obtained from trees have long been the main raw materials for building buildings. Timber is a source of many different building materials because of its ability to be cut into various shapes and sizes and its general properties as a building material to form many different building structures. Not only can trees be cut into two-by-fours, one-by-tens, plywood, decking, etc., but different woods are easily passed through Glue, nails, screws, bolts and other fastening devices hold together. Wood is easy to shape and combine with other products to produce th...

Claims

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Application Information

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IPC IPC(8): C04B18/06E04C1/00
CPCC04B2111/802C04B2111/00129C04B28/02Y02W30/91C04B14/202C04B18/26C04B22/16C04B24/2623C04B24/383C04B2103/54C04B14/28C04B14/305C04B18/241C04B24/26
Inventor S·K·霍德森P·J·安德森
Owner E KHASHOGGI INDS
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