Cement composition for extrusion

• US 5,047,086 A
• Filed: 04/28/1989
• Issued: 09/10/1991
• Est. Priority Date: 05/06/1988
• Status: Expired due to Term

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Nakamura, Shin-Ichiro, Hayakawa, Kazuhisa, Chiba, Tohru
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): MARCANTONI, PAUL D
• Application Number:
  US07/344,600
• Time in Patent Office: 865 Days
• Field of Search: 524/43, 106/118, 106/119, 106/120, 106/89, 106/93, 106/108, 106/731, 106/737, 106/797
• US Class Current: 106/731
• CPC Class Codes: C04B 18/241 Paper, e.g. waste paper; Paper pulp
• CPC Class Codes: C04B 2111/00129 Extrudable mixtures
• CPC Class Codes: C04B 2111/12 Absence of mineral fibres, e.g. asbestos
• CPC Class Codes: C04B 22/002 Water
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A cement composition for extrusion which is produced by incorporating, into cement mortar, 3 to 15 weight % of crushed pulp fiber, 0.2 to 1 weight % of at least one member selected from an alkylcellulose and a hydroxyalkylalkyllcellulose, and a 2% water solution having a viscosity of 80,000 cps or more allows for reduced production costs by reducing the loads of the binder material using a pulp fiber without carcinogenicitic asbestos fiber. Furthermore, it allows for excellent extrudability and provides the moldings with workability such as nailing and sawing.

Claims

1. A cement composition for extrusion, consisting of 60-75 wt % cement mortar including about 50 wt % of cements and 16-21 wt % of aggregates, 3-15 wt % crushed pulp fiber and 0.2-1 wt % of at least one member selected from the group consisting of alkylcellulose and hydroxyalkylalkylcellulose in a 2% aqueous solution having a viscosity of 80,000 cps or more at 20°

C.

2. A cement composition for extrusion according to claim 1 wherein the crushed pulp fiber is 5 to 20 microns in diameter and 1 to 10 mm in length.

3. A cement composition for extrusion according to claim 1 wherein the alkylcellulose is at least one member selected from the group consisting of methylcellulose and ethylcellulose.

4. A cement composition for extrusion according to claim 1 wherein the hydroxyalkylalkylcellulose is at least one member selected from the group consisting of hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and hydroxyethylethylcellulose.

5. A cement composition for extrusion according to claim 1, wherein the cement composition is free of inorganic fibers.

6. A cement composition for extrusion according to claim 1, wherein moldings produced from the cement composition have suitable workability so as to enable nailing and sawing thereof.