Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
  • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
  • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B13/12—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
  • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/06—Interconnection of layers permitting easy separation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/748—Releasability
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2419/00—Buildings or parts thereof

Definitions

• the present disclosure relates to a sheet for concrete curing used to cure concrete immediately following pouring of the concrete; and more particularly relates to a sheet for concrete curing which can be easily separated into each laminate member and recovered when recovering after use of the sheet.
• Patent Document 1 describes a sheet for concrete curing comprising a cell- containing layer and an adhesive agent- impregnated layer.
• Patent Document 2 describes a curing method in which a sheet for curing having a thickness of about 1 mm to 2 mm is adhered to a concrete tunnel lining.
• Patent Document 1 Japanese Unexamined Patent Application Publication No. 2012-52334
• Patent Document 2 Japanese Unexamined Patent Application Publication No. 2008-156927
• an object of the present disclosure is to provide a sheet for curing by which the cell-containing layer and the adhesive layer can be separately recovered easily after use. Furthermore, another object of the present disclosure is to enable reusability by providing a sheet for concrete curing including a new adhesive layer provided on the recovered cell-containing layer.
• One aspect of the present disclosure is a sheet for concrete curing including a cell-containing layer and an adhesive layer laminated on said cell-containing layer, wherein: the adhesive force generated between the adhesive layer and the cell-containing layer is not more than 80% of an adhesive force generated between the adhesive layer and a concrete-cast surface, and the adhesive force generated between the adhesive layer and the concrete-cast surface is at least 0.15 N/cm 2 .
• the sheet for concrete curing has an elongated form, and the adhesive layer is not provided on at least a portion of a surface of the cell-containing layer, said portion being a surface of an edge side of the curing sheet for concrete.
• Another aspect of the present disclosure is a method for separating and recovering a used sheet for concrete curing, the method including the steps of: recovering a cell-containing layer by peeling a portion of a surface of a cell-containing layer where an adhesive layer is not provided from a concrete- cast surface, said portion being a surface of an edge side of the curing sheet for concrete; and recovering the adhesive layer by peeling a portion of the remainder of the adhesive layer of the sheet for concrete curing from the concrete-cast surface.
• sheet for concrete curing refers to a sheet used to cover the cast surface of concrete, from which the concrete casting mold has been removed, after casting ready-mixed concrete into the concrete casting mold.
• the concrete maintains humidity necessary for curing by being covered by the sheet and temperature is controlled by the thermal insulating functionality of the sheet itself. As a result, generation of destructive cracks and the like in the surface of the concrete is reduced .
• the state of "the portion of the surface of the cell-containing layer where the adhesive layer is not provided” refers to a state where the adhesive layer is not provided on a portion (e.g. portion indicated by reference numeral 15 in FIGS. 1 and 2) of the surface of the cell-containing layer on a side of the cell-containing layer on which the adhesive layer is laminated.
• the sheet for concrete curing according to the present disclosure is a sheet by which the cell- containing layer and the adhesive layer of the sheet can be separated and individually recovered easily when peeling the sheet from a concrete-cast surface after use. Therefore, each sheet member can be disposed of appropriately and air pollution accompanying disposal can be reduced. Additionally, with the sheet for concrete curing of the present disclosure, reusability is easily enabled by providing a new adhesive layer on the surface of the recovered cell-containing layer.
• FIG. 1 is a perspective view illustrating the appearance of a curing sheet for concrete according to an embodiment of the present disclosure.
• FIG. 2 is a cross-sectional view of the curing sheet for concrete according to the embodiment of the present invetion disclosure, taken along line X-X depicted in FIG. 1.
• FIGS. 3a and 3b are process diagrams illustrating an example of a procedure for adhering the sheet for concrete curing according to the present disclosure to a concrete-cast surface.
• FIGS. 4a to 4d are process diagrams illustrating separating and recovering of each layer from the concrete-cast surface after using the sheet for concrete curing according to the embodiment of the present disclosure.
• FIGS. 5a- 1 to 5d-l are perspective views illustrating various forms of the sheet for concrete curing according to the present disclosure.
• FIGS. 5a- 2 to 5d-2 are front views illustrating various forms of the sheet for concrete curing according to the present disclosure.
• FIG. 1 is a perspective view illustrating the appearance of a curing sheet for concrete 1 according to an embodiment of the present disclosure.
• FIG. 2 is a cross-sectional view of the curing sheet for concrete 1 depicted in FIG. 1 , taken along line X-X.
• the sheet for concrete curing 1 is configured as a laminate that includes a cell-containing layer 10 and an adhesive layer 20.
• the cell-containing layer 10 is configured so that a top face and/or a bottom face of a film 16 having multiple recesses and protrusions is covered by a cover film 12 (a first cover film 12' and/or a second cover film 12").
• the adhesive layer 20 is laminated so as to cover substantially the entire surface of the cover film 12 on the cell-containing layer 10.
• the adhesive layer 20 is provided so as not to cover a portion 15 of the surface of the edge side of the cover film 12. That is, the adhesive layer 20 is preferably configured so as not to be provided on a portion 15 of the surface of the edge portion of the cell-containing layer 10. Reasons for this are in order to secure a starting point for separation of the cell-containing layer from the adhesive layer and to enable easy separation of these two constituents.
• Examples of specific forms of the curing sheet for concrete 1 according to the present disclosure include the various forms illustrated in FIG. 5.
• An example of a preferred form of the adhesive layer 20 is a laminate including a backing 22 and an adhesive agent layer 24.
• the adhesive agent layer 24 included in the adhesive layer 20 preferably can maintain an adhesive force with a concrete-cast surface 100 of at least 0.15 N/cm 2 throughout the curing period of the concrete.
• Such a configuration is preferable because, if an adhesive force of at least 0.15 N/cm 2 is maintained, it can be fully anticipated that a sheet for concrete curing, which has been applied under regular use conditions, can be fixed and will not become displaced on the concrete-cast surface 100 during the curing period of the concrete.
• the adhesive force is preferably configured so as to be at least 0.3 N/cm 2 , or at least 0.5 N/cm 2 .
• concrete casting refers to the task of casting ready-mixed concrete into an assembled concrete casting mold, and the task of setting the ready-mixed concrete thereafter.
• concrete-cast surface 100 refers to an outermost surface of the ready-mixed concrete from which the casting mold has been removed, at a point where the ready-mixed concrete can maintain its own form.
• Ready-mixed concrete refers to concrete produced in accordance with the specifications of
• JISA 5308 and, specifically, preferably refers to concrete that is optimal from the perspectives of the casting conditions of the ready -mixed concrete, the strength of the cured concrete structure, and the like.
• normal ready-mixed concrete preferably includes from 10 parts by mass to 100 parts by mass of water and from 30 parts by mass to 200 parts by mass of aggregate, both per 100 parts by mass of cement.
• a combination of fine aggregate and coarse aggregate is preferably used because the aggregate increases density when curing.
• a grain diameter of the aggregate can be appropriately selected from a range of a few mm to tens of mm.
• the cement preferably complies with the specifications set forth in JISR 5210, 521 1, 5212, 5213, and 5214.
• “Curing period” refers to the period lasting until the ready-mixed concrete expresses sufficient strength as a result of hydration reaction.
• Average daily temperatures vary and, with the cement described above, when the average daily temperature is 15°C or greater, the curing period is at least seven days, when the average daily temperature is 10°C or greater, the curing period is at least 10 days, and when the average daily temperature is 5°C or greater, the curing period is at least 12 days.
• a maximum value of the adhesive force between the adhesive layer 20 and the concrete-cast surface 100 is determined by the tensile strength of the adhesive layer 20. That is, the maximum value of the adhesive force is selected from within a range where breakage does not occur when peeling and recovering the adhesive layer 20 from the concrete-cast surface 100 due to the adhesive strength between the adhesive layer 20 and the concrete-cast surface 100 being excessively strong.
• An adhesive force generated between the adhesive layer 20 and the cell-containing layer 10 is preferably not more than 80% of the adhesive force generated between the adhesive layer 20 and the concrete-cast surface 100. A reason for this is because such a configuration enables the separation and recovery of only the cell-containing layer 10 while leaving the adhesive layer 20 adhered to the concrete- cast surface 100.
• the adhesive force generated between the backing 22 of the adhesive layer 20 and the first cover film 12' of the cell-containing layer 10 is preferably not more than 80% of the adhesive force generated between the adhesive agent layer 24 of the adhesive layer 20 and the concrete-cast surface 100
• the bonding strength between the members constituting the adhesive layer 20 e.g. the adhesive agent layer 24, the backing 22, etc.
• the bonding strength between the members constituting the cell-containing layer 10 e.g. the first cover film 12', the second cover film 12", the film 16 having recesses and protrusions, etc.
• the bonding strength between the members constituting the adhesive layer 20 e.g. the adhesive agent layer 24, the backing 22, etc.
• the bonding strength between the members constituting the cell-containing layer 10 e.g. the first cover film 12', the second cover film 12", the film 16 having recesses and protrusions, etc.
• the type of adhesive agent, formulation, thickness of the adhesive agent, and method of bonding the adhesive layer 20 to the cover film are appropriately selected in order to achieve adhesive force that satisfies the condition described above.
• the type of the adhesive agent constituting the adhesive agent layer can be selected from acrylic resins, silicone resins, and fluorine resins.
• the formulation of the adhesive agent is preferably an emulsion system.
• the thickness of the adhesive layer is selected taking the extent of the recesses and protrusions (unevennesses) that exist on the concrete-cast surface into consideration, but is generally in a range from 20 ⁇ to 100 ⁇ .
• the type and material of the backing 22 included in the adhesive layer 20 can be selected from polyolefin resins such as polypropylene resins, polyethylene resins, and the like, of which a single type or combination of two or more types may be used.
• polypropylene resins that are suitable for use as the backing 22 include propylene homopolymers, copolymers of propylene and another olefin, and the like.
• the other olefin to be copolymerized with the propylene include a-olefins such as ethylene, butene- 1, isobutylene, pentene-1, and the like; and the copolymer of the propylene with these other olefins may be either a random copolymer or a block copolymer.
• polyethylene resins that are suitable for use as the backing 22 include high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear very low density polyethylene (LVLDPE), ethylene -vinyl acetate copolymers, and the like.
• the backing 22 is preferably formed from the same material as the first cover film 12' (see FIG. 2).
• the thickness of the backing 22 is selected taking adhesion properties during the heat-bonding process into consideration, but is generally in a range from 20 ⁇ to 200 ⁇ .
• the adhesive layer 20 and the backing 22 are fabricated as a laminate in which the adhesive agent is applied to the backing 22.
• the cell-containing layer 10 has a configuration in which the top face and/or the bottom face of the film 16 having multiple recesses and protrusions is covered by the cover film 12.
• a laminate can be fabricated by encapsulating air in the recesses of the film 16 having recesses and protrusions and laminating the cover film 12 thereon via heat-bonding or the like (with the sheet illustrated in FIG. 2, the first cover film 12' and the second cover film 12"), without collapsing the recesses and protrusions of the film 16 having recesses and protrusions.
• a depth of the recesses of the film 16 is from 2.0 mm to 20.0 mm and an area of a top surface of each of the protrusions of the film 16 is from 10 mm 2 to 250 mm 2 .
• a total area of the top surfaces of the protrusions of the film having recesses and protrusions is selected from a range of 20% to 80% of the total area of the cover film 12.
• the cell-containing layer 10 may be either columnar (including prism and cylinder) or frustral (including circular frustral and pyramidal frustral). Additionally, the cell-containing layer 10 may be multi-layered, being formed by providing a plurality of cover films on the film having a plurality of recesses and protrusions.
• a resin material can be used for the film 16 having recesses and protrusions and the cover film 12 and examples thereof include polyolefin resins such as polypropylene resins, polyethylene resins, and the like, of which a single type or combination of two or more types may be used.
• polyolefin resins such as polypropylene resins, polyethylene resins, and the like, of which a single type or combination of two or more types may be used.
• polypropylene resins examples include propylene homopolymers, copolymers of propylene and another olefin, and the like.
• examples of the other olefin to be copolymerized with the propylene include a-olefins such as ethylene, butene- 1, isobutylene, pentene-1, and the like; and the copolymer of the propylene with these other olefins may be either a random copolymer or a block copolymer.
• examples of the polyethylene resins include high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear very low density polyethylene (LVLDPE), ethylene-vinyl acetate copolymers, and the like.
• the same resin may be selected from among the resin materials described above for the film 16 having recesses and protrusions and the cover film 12 or, as necessary, different resins may be selected.
• thicknesses of each of the films is configured to be in a range from 10 ⁇ to 80 ⁇ .
• Bonding of the cell-containing layer 10 and the adhesive layer 20 can be performed via heat- bonding while contact bonding the adhesive layer 20 to the cell-containing layer 10. Specifically, in the example of the sheet for concrete curing 1 illustrated in FIG. 2, the cover film 12 of the cell-containing layer 10 is heat-bonded to the backing 22 of the adhesive layer 20. Additionally, bonding of the cell- containing layer 10 and the adhesive agent layer can be performed by applying a coating liquid including an adhesive agent composition to the cell-containing layer 10.
• the constituents when using heat-bonding, may be laminated by extruding the adhesive layer onto the cell-containing layer 10 at a temperature of about 200°C.
• the adhesive layer 20 of a sheet A for concrete curing is aligned with a predetermined position on the concrete-cast surface and adhered to the concrete-cast surface 100. Then, as illustrated in FIG. 3b, a portion of an edge surface of sheet B for concrete curing is abutted against the sheet A such that a gap is not formed therebetween, thus adhering the sheets to the concrete- cast surface.
• the sheet for concrete curing according to the present disclosure can, for example, be separately recovered via the procedure illustrated in FIGS. 4a to 4d.
• the cell-containing layer 10 is recovered from the concrete-cast surface 100 by peeling at a location ("X" in FIGS. 4a to 4c), where an adhesive layer 24 is not provided, on the edge face of a short side of the sheet for concrete curing (FIGS. 4b and 4c).
• the sheet for concrete curing is constituted by a cell-containing layer and an adhesive layer laminated on said cell-containing layer, wherein an adhesive force generated between the adhesive layer and the cell-containing layer is not more than 80% of the adhesive force generated between the adhesive layer and a concrete-cast surface, and the adhesive force generated between the adhesive layer and the concrete-cast surface is at least 0.15 N/cm 2 .
• an adhesive force generated between the adhesive layer and the cell-containing layer is not more than 80% of the adhesive force generated between the adhesive layer and a concrete-cast surface, and the adhesive force generated between the adhesive layer and the concrete-cast surface is at least 0.15 N/cm 2 .
• the form of the sheet for concrete curing (1) described above is elongated, and is free of adhesive on at least a portion of its surface, said portion being an edge side of the sheet for concrete curing.
• peeling can be started from the portion of the surface of the sheet where the adhesive layer is absent, which makes easy separation and recovery possible.
• the material of the cover film of the cell-containing layer contacting the adhesive layer is an olefin resin
• the material of the adhesive agent of the adhesive layer is an acrylic resin
• a cell-containing layer is recovered from the concrete-cast surface by peeling a portion of a surface of a cell-containing layer where an adhesive layer is not provided from a concrete- cast surface, said portion being a surface of an edge side of the curing sheet for concrete. Thereafter, the adhesive layer is recovered from the concrete-cast surface.
• each sheet member can be disposed of appropriately and air pollution accompanying disposal can be reduced. Additionally, it is possible to reuse the sheet by providing a new adhesive layer on the surface of the separately recovered cell-containing layer.
• Adhesive layer a) Backing-material (polyethylene), thickness (50 ⁇ ), width (300 mm), length (1,000 mm); b) Adhesive agent layer-material (acrylic), thickness (50 ⁇ ), width (300 mm), length (1,000 mm).
• Method of bonding the cell-containing layer with the adhesive layer Using a thermal fusion bonding method, a fusion bonding temperature was set to about 200°C, and the adhesive force between the two constituents was adjusted by changing the pressurization conditions. Additionally, when bonding the two constituents, the constituents were offset 20 mm in the width direction so as to provide a portion on the surface of the longitudinal edge of the sheet for concrete curing where the adhesive layer was not provided. Thus, a sheet for concrete curing having the form illustrated in FIG. 1 and FIG 5a was fabricated.
• a concrete block having a cast surface with a width of 50 cm, a length of 50 cm and a height of 100 cm was prepared, and the sheet for concrete curing prepared according to the method described above (1) was adhered by hand to said concrete-cast surface.
• the adhesive strength between the cell-containing layer and the adhesive layer and the adhesive strength between the adhesive layer and the concrete cast surface was measured by following steps based on JISK6849 published in 1994..
• Table 2 The evaluations shown in Table 2 are based on the following standards. 1) Evaluation of formation of destructive cracks in the concrete-cast surface: Examples in which there were no destructive cracks formed in the concrete-cast surface after testing were given an evaluation of "A"; and examples in which one or more cracks formed were given an evaluation of "B”. 2) Evaluation of peeling: Examples in which the sheet for concrete curing did not peel from the concrete-cast surface during the rest period (curing period) were given an evaluation of "A"; and examples in which the sheet did peel from the surface were given an evaluation of "B”. 3) Evaluation of separate recovery of the sheet for concrete curing: The sheet was peeled from the concrete-cast surface according to the method illustrated in FIGS. 4A to 4D.

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• Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

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• 2012
  • 2012-08-13 JP JP2012179531A patent/JP6178053B2/ja not_active Expired - Fee Related
• 2013
  • 2013-08-13 WO PCT/US2013/054723 patent/WO2014028484A1/en active Application Filing

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