US3581780A - Double layer high strength concrete pipe - Google Patents

Double layer high strength concrete pipe Download PDF

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Publication number
US3581780A
US3581780A US817514A US3581780DA US3581780A US 3581780 A US3581780 A US 3581780A US 817514 A US817514 A US 817514A US 3581780D A US3581780D A US 3581780DA US 3581780 A US3581780 A US 3581780A
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United States
Prior art keywords
pipe
cement
csa
layer
concrete pipe
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Expired - Lifetime
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US817514A
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English (en)
Inventor
Yoshizo Ono
Satoru Furui
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Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/08—Rigid pipes of concrete, cement, or asbestos cement, with or without reinforcement
    • 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
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite

Definitions

  • a reinforced concrete pipe having an inner layer and an outer layer, said outer layer comprising Portland cement and said inner layer comprising a blend ofa cement expanding agent and Portland cement in a proportion of from 4:96 to 20:80 by weight, said cement expanding agent comprising a pulverized, sintered material having a molar CaO/Al O ratio of 2/6 and a molar CaSO /Al O ratio of 2/4, said pulverized, sintered material having a grain size distribution of particles of less than 44 microns representing less than 10 percent, particles of 44-250 microns representing more than 70 percent and particles of more than 250 microns representing less than 20 percent.
  • a method of making a high strength reinforced concrete pipe which comprises molding a reinforced concrete pipe having the above-noted composition, curing until said pipe has a strength sufficient to resist the mold releasing, releasing said pipe from the mold and subjecting said pipe to curing.
  • This invention relates to a method of making a high strength, reinforced, concrete pipe.
  • the present invention provides a low cost and very high strength reinforced concrete pipe obtained by more simplified working steps than in the prior art, comprising molding a reinforced concrete pipe using an expansive cement blended with a cement expanding agent consisting mainly of calcium sulfoaluminate, free lime and free gypsum (referred to as CSA hereinafter), curing in a molding flask until a strength sufficient to resist the releasing therefrom is given, then releasing the molded pipe from the mold and subjecting it tocuring in water or by spraying to promote the expansion of the concrete.
  • CSA cement expanding agent consisting mainly of calcium sulfoaluminate, free lime and free gypsum
  • the initial cracking-load and breaking load are raised by blending the usual Portland cement with CSA whereby the nonshrinkage high strength by curing on a flash and the reinforcing bars are tensioned by expansion of the concrete to apply a compressive stress to the COIICI'CIC.
  • FIGS. 1 and 2 are schematic illustrations of the reinforced concrete pipe of the present invention in cross section.
  • the pipe wall is divided into two layers, inner layer A and outer layer B, three points (a), (b), (c) being on the inside of said inner layer, inside of said outer layer and outside of said outer layer respectively.
  • the layer near the circumference, including points (a) and (b) is enriched with lighter weight cement than that of the aggregate caused by the centrifugal force acting during the molding and the hardening and drying shrinkage, and in particular, at point (a) is so large that a tensile stress is applied.
  • the present inventors make it possible, as a result of various studies, to make a desired concrete pipe by carrying out molding of a pipe layer by one of the following three methods, and carrying out a sufficient curing after adding a suitable amount of CSA and a mold releasing agent.
  • reinforcing bars Since the generation of a tensile stress by a load of external pressure is greater in the interior of a pipe, and since the binding of reinforcing bars does not extend up to the expansion of concrete at the outside of the reinforcing bars, a higher CSA- blended concrete, having a larger expansive force, is used inside the pipe so that the distribution of prestress is higher on the inside. Arrangement of reinforcing bars is such that a part or all of the reinforcing bars may be in the inner concrete having a larger expansive force, the remaining being in the outer concrete. Furthermore, the quality and quantity of the reinforcing bars is determined similarly to the foregoing (l) or (2).
  • the usual Portland cement, aggregate and CSA are adequately blended with water, charged into a molding flask in which reinforcing bars are assembled (in the case of foregoing molding method (I), CSA is not blended), subjected to revolving for a predetermined time, for example, in the centrifugal molding method and then the revolving of the molding flask is lowered (in the case of foregoing molding method (2), the revolving may be continued to a predetermined thickness) thereby forming a part corresponding to the layer B. Then, a mixture in which more CSA is blended than in the layer B is charged into the molding flask and subjected to revolving, thereby forming another part corresponding to layer A. in the case of foregoing molding method (2), the same compound is used as in layer B.
  • the CSA used herein is one capable of stress to the concrete through its reaction force.
  • Example 1 (Molding method 1 panding effect of concrete, that is, cement bacillus of high
  • the reinforced Concrete i e to be made is 1200 mm in sulfate type, which is prepared by firing a raw material having inner diameter 95 mm in g g thickness and 2430 in p r a caomlzoa of 2/6 and a 3 i and length.
  • Twenty-four iron wires 1 5 mm.) were used as the pulverizing the sintered product to a grain size distribution of Strai ht reinforcin bar and an iron Wire itch 35 mm d) 4 particles of less than 44 microns representing less than per- 10 mm was used s the S iral reinforcing g The was cent particles of 44-250 microns representing more than 70 molded by the centrifuga method and comprises two layers F pamdfs Tg g i z g f the insidekyerhaving a thickness of 30 mm.
  • the pipe is Shown in Fig. 2A.
  • the CSA is preferably blended in a proportion of 4-20 percent in a cement.
  • a layer A should be blended therewith 1 percent more than layer B in order to achieve the object of the present invention.
  • a curing method a high temperature curing, at normal temperature or higher, is carried out in the molding flask after molding.
  • the temperature should not exceed 90 C since, when the CSA is blended, the evaporation of water from the concrete o,curs to such an extent that the water required for hydration is wanted.
  • the method of making a high strength reinforced concrete pipe according to the present invention provides three kinds of pipes, classified according to the foregoing CSA addition methods. That is to say, the method consists of molding l an outer layer consisting of only cement and an inner layer blended with CSA, (2) an outer and an inner layer blended with CSA or (3) an outer and an inner layer blended with CSA, the blending proportion being higher in the latter than in the former, curing at normal mold releasing is given and, thereafter, after mold releasing, subjecting the pipe to curing in water or by spraying, thereby to tension the reinforcing bars through the expansive force generated during the same time and to apply a compressive temperature, or higherpuntil a strength sufficie iiTTo resist the w
  • the reinforced concrete pipe to be made is 1200 mm.
  • the pipe is shown in Fig. 2B.
  • EXAMPLE 3 (MOLDING METHOD (3))
  • the pipe is shown in FIG. 2C.
  • a reinforced concrete pipe having an inner layer and an outer layer, said outer layer comprising Portland Cement and said inner layer comprising a blend of a cement expanding agent and Portland cement in a proportion of from 4196 to l :80 by weight, said cement expanding agent comprising a pulverized, sintered material having a molar CaO/A1 O ratio less than 44 microns representing less than 10 percent, particles of 44-250 microns representing more than 70 percent and particles of more than 250 microns representing less than 20 percent.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US817514A 1968-07-23 1969-04-18 Double layer high strength concrete pipe Expired - Lifetime US3581780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5159568 1968-07-23

Publications (1)

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US3581780A true US3581780A (en) 1971-06-01

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US817514A Expired - Lifetime US3581780A (en) 1968-07-23 1969-04-18 Double layer high strength concrete pipe

Country Status (4)

Country Link
US (1) US3581780A (de)
DE (1) DE1936667C3 (de)
FR (1) FR2013544A1 (de)
GB (1) GB1279869A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980001601A1 (en) * 1979-01-26 1980-08-07 Nii Betona I Zhelezobetona Multilayer reinforced concrete pipe
US4412561A (en) * 1980-01-11 1983-11-01 Kurimoto Iron Works, Ltd. Glass fiber-reinforced cement non-plate articles
US4450873A (en) * 1976-12-23 1984-05-29 Manville Service Corporation Reinforced plastic composite structure
US20140157715A1 (en) * 2011-07-17 2014-06-12 Philipp Wagner Method and Sliding Form for Producing a Structure and Corresponding Structure
US9498897B2 (en) 2014-07-29 2016-11-22 161508 Canada Inc. System and process for molding of parts made of fiber cement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2812496A1 (de) * 1978-03-22 1979-09-27 Kronimus Betonsteinwerk Verfahren zur herstellung von betonsteinen mit einer der natuerlichen sandsteinoberflaeche entsprechenden oberflaeche
JPH068676B2 (ja) * 1987-03-24 1994-02-02 テイヒュー株式会社 コンクリ−ト系複合管及びその製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155526A (en) * 1961-10-18 1964-11-03 Chem Prestressed Concrete Calcium aluminosulfate and expansive cements containing same
US3251701A (en) * 1964-07-27 1966-05-17 Chem Prestressed Concrete Expansive and shrinkage-compensated cements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155526A (en) * 1961-10-18 1964-11-03 Chem Prestressed Concrete Calcium aluminosulfate and expansive cements containing same
US3251701A (en) * 1964-07-27 1966-05-17 Chem Prestressed Concrete Expansive and shrinkage-compensated cements

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450873A (en) * 1976-12-23 1984-05-29 Manville Service Corporation Reinforced plastic composite structure
WO1980001601A1 (en) * 1979-01-26 1980-08-07 Nii Betona I Zhelezobetona Multilayer reinforced concrete pipe
US4412561A (en) * 1980-01-11 1983-11-01 Kurimoto Iron Works, Ltd. Glass fiber-reinforced cement non-plate articles
US20140157715A1 (en) * 2011-07-17 2014-06-12 Philipp Wagner Method and Sliding Form for Producing a Structure and Corresponding Structure
US9657722B2 (en) * 2011-07-17 2017-05-23 X-Tower Consructions GmbH Method and sliding form for producing a structure and corresponding structure
US9498897B2 (en) 2014-07-29 2016-11-22 161508 Canada Inc. System and process for molding of parts made of fiber cement
US9630341B2 (en) 2014-07-29 2017-04-25 161508 Canada Inc. System and process for molding of parts made of fiber cement

Also Published As

Publication number Publication date
DE1936667C3 (de) 1978-12-07
DE1936667A1 (de) 1970-01-29
FR2013544A1 (de) 1970-04-03
GB1279869A (en) 1972-06-28
DE1936667B2 (de) 1978-04-13

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