GB2143226A - Fibre-reinforced hydraulic material - Google Patents

Fibre-reinforced hydraulic material Download PDF

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Publication number
GB2143226A
GB2143226A GB08413495A GB8413495A GB2143226A GB 2143226 A GB2143226 A GB 2143226A GB 08413495 A GB08413495 A GB 08413495A GB 8413495 A GB8413495 A GB 8413495A GB 2143226 A GB2143226 A GB 2143226A
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GB
United Kingdom
Prior art keywords
fibers
fiber
hydraulic binder
mechanical resistance
composite material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08413495A
Other versions
GB8413495D0 (en
GB2143226B (en
Inventor
Plaza Miguel-Jesus Munoz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fibrotubo Fibrolit SA
Original Assignee
Fibrotubo Fibrolit SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fibrotubo Fibrolit SA filed Critical Fibrotubo Fibrolit SA
Publication of GB8413495D0 publication Critical patent/GB8413495D0/en
Publication of GB2143226A publication Critical patent/GB2143226A/en
Application granted granted Critical
Publication of GB2143226B publication Critical patent/GB2143226B/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/10—Acids or salts thereof containing carbon in the anion
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates

Abstract

A process for preparing fiber-reinforced hydraulic composite material having a high mechanical resistance and durability is characterised by treating the hydraulic binder with compounds in solution (for example, carbonates and bicarbonates of ammonia or of alkaline and alkaline earth metals) at variable concentrations from 0.5 to 20 percent by weight and at different treating temperatures in the range 0 to 99 DEG centigrade. After setting has occurred this reduces the porosity of the product, increases its mechanical resistance, and causes a reduction of alkalinity of the cement matrix which prevents the degradation of the reinforcing fibres.

Description

SPECIFICATION Process for preparing a fiber-reinforced hydraulic binder composite material having a high mechanical resistance and durability The present invention refers to a process for preparing fiber-reinforced hydraulic set composite material, to the composite material prepared thereby, and to the application of the mentioned process for manufacturing fiber-reinforced pieces.
Fiber-reinfdrced cement products, especially asbestos cement, have widely been used with sucess in the manufacture of building materials (tubings, corrugated and flat slabs, tiles, etc.) since the end of the XIX Century. There are various manufacturing processes, the most commonly used today being the Magnani process, referred to in Asbestozement machine of H.
Hiendl (page 42, 1964), the Hatschek process (Austrian patent No. 5,970) and the Mazza process (Italian patent 185,500).
These product manufacturing processes mainly consist in forming water-diluted suspensions of the asbestos and cement mixtures which are filtered by means of a suitable procss, being deposited on a felt which conveys the slab to be wound on cylindrical drums until the product thickness necessary in each case is obtained. The material formed on the cylinder could then be cut to be corrugated, in the case of corrugated slabs.
It is a known fact that the availabilities of asbestos have been decreasing as time passed, due to the limitation of asbestiform ore deposits throughout the planet.
Due to the mentioned factors, that is the existence of a fully developed technology for the manufacture of asbestos cement building materials, and, on the other hand, the limitation of the availability of the main raw material, attempts have lately been made to seek and develop products which do not contain asbestos fibers (See U.S. patents 4,261,754 and 4,263,049 and French patents 2,409,969; 2,448,516; 2,442,071 and 2,479,280 inter alia).
All the attempts, other than the use of asbestos, try to imitate and reproduce the characteristics of this fiber, whether from the point of view of known technological processes or from the properties of the fiber-reinforced products. From these points of view, searches have been made to find fibers or fiber mixtures capable of forming suspensions in water with the cement, having the sufficient filtration characteristics for use in the known production machines, furthermore imparting the mechanical resistance required by each product.
Attempts have been made to use the following fibers, on the basis of the reinforcing characteristics: steel fiber, different types of glass fibers, carbon fibers, polyvinyl alcohol fibers, polypropylene fibers, acrylic fibers, phenolformaldehyde fibers, polyester fibers, polyamide fibers, both aliphatic and aromatic, polyacrylonitrile fibers, etc., in amounts which normally varied from 0.5 to 25% of its composition.
When trying to achieve the filtration characteristics, the following fibers were used: cellulose, polyethylene, fibrillar, mechanical and chemical paper pulp and paste, mineral wool and slug wool, kaolin wool, etc.
All these processes have encountered two main drawbacks.
On the one hand, since the cement must be retained, the use of an elevated percentage of filtering fibers is necessary, giving rise to products having a high porosity, diminishing the adhesion of the fibers to the hydraulic binder and, therefore, limiting the mechanical characteristics of the products.
On the other hand, some varieties of the fibers used undergo a deterioration and degradation due to the attack of the alkaline medium of the cement matrix, giving rise to very poor results as to the durability of the manufactured products.
Therefore, the ideal solution resides in being able to manufacture, according to the normal processes used in the asbestos cement industry, products made of both these filtering and reinforcing fibers, and a hydraulic binder, thereby guaranteeing the mechanical resistances and durability characteristics similar to those of the present-day asbestos cement and being, in turn, competitive with these products.
The process for preparing a fiber-reinforced hydraulic set composite material having a high mechanical resistance and durability of this invention, is characterised in that it follows a manufacturing process based on filtering and reinforced-fibers, similar to conventional fibers for asbestos cement, carrying out setting in solutions of determined inorganic and organic salts, at concentrations of from 0 to 10% and temperatures of from 5 to 95 C, to reduce the porosity of the product, to increase its mechanical resistances and to cause a reduction of the alkalinity of the cement matrix, which safeguards the degradation of the reinforcing fibers.
Fibers which can be used as reinforcing fibers can have an inorganic or organic origin, such as steel fibers, different types of glass fibers, carbon fibers, polyvinyl alcohol fibers, polypropylene fibers, polyethylene fibers, acrylic fibers, phenolformaldehyde fibers, polyester fibers, aliphatic and aromatic polyamide fibers, polyacrylonitrile fibers, etc., having a preferred length of 20-25 mm in amounts which can range of from 0.5 to 25% by volume.
Fibers which can be used as filterering fibers are; cellulose fibers, polyethylene, fibrillar, mechanical and chemical paper pulp and paste, slug wool, kaolin wool, mineral wool, etc.
This process can be used for asbestos cement, in order to obtain higher mechanical yields or performances.
As suitable hydraulic binders, Portland cement, marble cement, puzzolanic cement and high furnce slag cement, calcium silicates and/or mixtures thereof, can be used.
It is possible to use, as additives, other materials such as quartz, perlite, diatomaceous earth, flue dusts, pozzolana, mineral wool, etc.
As compounds in solution, for the appropriate setting and curing treatment, carbonate and bicarbonate alkalines and alkaline earth metals can be used.
The treatment conditions appropriate for setting can vary, with respect to temperature, of from 5 to 95,C, and with respect to concentrations, from 0.5 to 20"C by weight of the treating agent.
During the process, the compounds in solution react chemically with the hydratant calcium silicates of the cement matrix, reducing the alkalinity and forming microcrystalline structures which produce a higher compactness of the end product, increasing its mechanical characteristics.
The chemical scheme of the process includes the following reactions:
The experimental results obtained clearly demonstrate that the process of this invention proportions fiber-reinforced cement products having a mechanical resistance higher than that of known products and a longer durability.
The following table illustrates some of the results obtained with some of the tests carried out: TABLE OF RESULTS Test Reinforcing % Fiber Getting Duration Flexotraction Fibers of setting Resistance (days) (N/mm) 1 Asbestos 9% under water 3 20.1 2 Polyvinyl alcohol 3% Na2CO3 3 21.4 Cellulose 5% (2% and 22 C 3 Polyacrylonitrile 3.5% NaCO3 3 22.5 Cellulose 7% (3% and 30 C) 4 Glas fiber 5% NH4HCO3 3 20.6 Cellulose 6% (2.5% at 25 C) 5 Glass fiber 3% Ha2CO3 3 19.8 Cellulose 7% (3% at 30 C) 6 Polyacrylonitrile 2% NH4HCO3 3 20.2 Cellulose 6% (3% at 25 C) 7 Polyvinyl alcohol 2.5% Na2CO3 3 21.0 Cellulose 5.5% (4% at 25 C)

Claims (1)

1. Process for preparing a fiber-reinforced hydraulic binder composite material having a high mechanical resistance and durability, characterized by treating the hydraulic binder with compounds in solution, using such as carbonates and bicarbonates, mainly alkaline and alkaline earth metals, at variable concentrations of from 0.5 to 20% by weight and at different treating temperatures comprised of from 0 to 99"C.
2. Process for preparing a fiber-reinforced hydraulic binder composite material having a high mechanical resistance and durability according to claim 1, characterized in that said fibers are selected from natural and cellulose fibers, etc. and synthetic fibers, both inorganic and organic, for example, steel fiber, glass fibers, carbon fibers, polyvinyl alcohol fibers, polypropylene fibers, acrylic fibers, phenolformaldehyde fibers, polyester fibers, aromatic and aliphatic polyamide fibers, polyacrylonitrile fibers, in amounts of from 0.5 to 20% of the composition.
3. Process for preparing a fiber-reinforced hydraulic binder composite material having a high mechanical resistance and durability according to claim 1, characterized in that other additives and materials, such as quartz, perlite, mineral wool, flue dusts or pozzalana, and mixtures thereof, are used.
1. Process for preparing a fiber-reinforced hydraulic binder composite material having a high mechanical resistance and durability, characterised by treating the hydraulic binder with inorganic salt solutions at 0-10% by weight, at variable fibre concentrations of from 0.5 to 20% by weight and at different treating temperatures comprised of from 5 to 95"C.
GB08413495A 1983-07-12 1984-05-25 Fibre-reinforced hydraulic material Expired GB2143226B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES524067A ES8502068A1 (en) 1983-07-12 1983-07-12 Fibre-reinforced hydraulic material

Publications (3)

Publication Number Publication Date
GB8413495D0 GB8413495D0 (en) 1984-07-04
GB2143226A true GB2143226A (en) 1985-02-06
GB2143226B GB2143226B (en) 1987-02-18

Family

ID=8486014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08413495A Expired GB2143226B (en) 1983-07-12 1984-05-25 Fibre-reinforced hydraulic material

Country Status (9)

Country Link
BE (1) BE899810A (en)
DE (1) DE3424312A1 (en)
DK (1) DK269884A (en)
ES (1) ES8502068A1 (en)
FR (1) FR2550780B1 (en)
GB (1) GB2143226B (en)
IT (1) IT1176252B (en)
NL (1) NL8401857A (en)
PT (1) PT78771B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4710540A (en) * 1986-01-03 1987-12-01 Exxon Chemical Patents Inc. Composition for preparing cement-adhesive reinforcing fibers
US4861812A (en) * 1986-12-23 1989-08-29 Exxon Chemical Patents Inc. Compositions for preparing cement-adhesive reinforcing fibers
EP1797018A1 (en) * 2004-08-27 2007-06-20 Paul W. Brown Methods of reducing hydroxyl ions in concrete pore solutions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391132B (en) * 1987-04-17 1990-08-27 Eternit Werke Hatschek L Mixture for producing fibre-containing shaped bodies, their use, shaped bodies produced therefrom and also a process for producing heat-treated cellulose fibres
EP3490952B1 (en) 2016-05-24 2023-10-04 NeoCrest LLC Polymer fibers for reinforcement of cement-based composites

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB244178A (en) * 1924-09-12 1925-12-14 Novocrete And Cement Products Improvements in or relating to the induration or mineralization of organic matter
GB244142A (en) * 1924-07-12 1925-12-14 Novocrete And Cement Products Improvements in or relating to the manufacture of building or constructional elements or materials
GB529128A (en) * 1938-06-09 1940-11-14 Plant Rubber & Asbestos Works Magnesium carbonate composition and method of preparation
GB537683A (en) * 1939-01-28 1941-07-02 Paul Anft An improved process for mineralising organic fillers for light structural substances
GB1089777A (en) * 1964-11-20 1967-11-08 Bourlin Ind Inc Production of light-weight concrete products
GB1179116A (en) * 1966-08-25 1970-01-28 John Laing Res And Dev Ltd Improvements in the Manufacture of Lightweight Aggregate.
GB1517465A (en) * 1976-07-23 1978-07-12 Nippon Hardboard Method of fabricating a magnesium carbonate board
GB1557435A (en) * 1977-07-19 1979-12-12 Pitun Unicrete Ltd Casting of articles from compositions containing calcined gypsum and portland cement
GB1584850A (en) * 1977-04-05 1981-02-18 Daiichi Kasei Process for treating the surface of glass fibre to impart resistance to alkalis

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR739335A (en) * 1932-07-01 1933-01-09 Process for manufacturing objects molded from a cement-based composition
GB480881A (en) * 1936-10-14 1938-03-02 Frederick George Denton An improved plastic self-hardening composition
FR1056100A (en) * 1950-12-01 1954-02-24 Tepha G M B H Process for accelerating the setting of replacement cements
FR2281338A1 (en) * 1974-08-07 1976-03-05 Produits Refractaires Concrete reinforced with refractory fibres - comprises rock wool and ceramic fibres mixed with Portland and aluminous cements
FR2536741A1 (en) * 1982-11-29 1984-06-01 Lafarge Fondu Int MORTAR AND COMBINATION OF THIS MORTAR WITH REINFORCING FIBERS FOR THE SUPPORT OF GALLERIES OF MINES AND THE LIKE

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB244142A (en) * 1924-07-12 1925-12-14 Novocrete And Cement Products Improvements in or relating to the manufacture of building or constructional elements or materials
GB244178A (en) * 1924-09-12 1925-12-14 Novocrete And Cement Products Improvements in or relating to the induration or mineralization of organic matter
GB529128A (en) * 1938-06-09 1940-11-14 Plant Rubber & Asbestos Works Magnesium carbonate composition and method of preparation
GB537683A (en) * 1939-01-28 1941-07-02 Paul Anft An improved process for mineralising organic fillers for light structural substances
GB1089777A (en) * 1964-11-20 1967-11-08 Bourlin Ind Inc Production of light-weight concrete products
GB1179116A (en) * 1966-08-25 1970-01-28 John Laing Res And Dev Ltd Improvements in the Manufacture of Lightweight Aggregate.
GB1517465A (en) * 1976-07-23 1978-07-12 Nippon Hardboard Method of fabricating a magnesium carbonate board
GB1584850A (en) * 1977-04-05 1981-02-18 Daiichi Kasei Process for treating the surface of glass fibre to impart resistance to alkalis
GB1557435A (en) * 1977-07-19 1979-12-12 Pitun Unicrete Ltd Casting of articles from compositions containing calcined gypsum and portland cement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4710540A (en) * 1986-01-03 1987-12-01 Exxon Chemical Patents Inc. Composition for preparing cement-adhesive reinforcing fibers
US4861812A (en) * 1986-12-23 1989-08-29 Exxon Chemical Patents Inc. Compositions for preparing cement-adhesive reinforcing fibers
EP1797018A1 (en) * 2004-08-27 2007-06-20 Paul W. Brown Methods of reducing hydroxyl ions in concrete pore solutions
EP1797018A4 (en) * 2004-08-27 2011-08-17 Paul W Brown Methods of reducing hydroxyl ions in concrete pore solutions

Also Published As

Publication number Publication date
IT8421239A0 (en) 1984-06-04
FR2550780B1 (en) 1987-12-18
DK269884A (en) 1985-01-13
IT1176252B (en) 1987-08-18
NL8401857A (en) 1985-02-01
IT8421239A1 (en) 1985-12-04
FR2550780A1 (en) 1985-02-22
BE899810A (en) 1984-10-01
ES524067A0 (en) 1984-12-16
DE3424312A1 (en) 1985-01-24
GB8413495D0 (en) 1984-07-04
DK269884D0 (en) 1984-05-30
GB2143226B (en) 1987-02-18
ES8502068A1 (en) 1984-12-16
PT78771A (en) 1984-07-01
PT78771B (en) 1986-06-26

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920525