WO2004102187A1 - Apparatus and method for measuring moisture content in concrete - Google Patents
Apparatus and method for measuring moisture content in concrete Download PDFInfo
- Publication number
- WO2004102187A1 WO2004102187A1 PCT/GB2004/001836 GB2004001836W WO2004102187A1 WO 2004102187 A1 WO2004102187 A1 WO 2004102187A1 GB 2004001836 W GB2004001836 W GB 2004001836W WO 2004102187 A1 WO2004102187 A1 WO 2004102187A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- wall
- bore
- opposite end
- humidity
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Definitions
- THIS INVENTION relates to apparatus for use in measuring moisture content in materials, particularly in building materials such as concrete.
- the apparatus of the invention is intended to facilitate measurement of the moisture content in, for example, a concrete wall or floor, at a predetermined depth or distance measured from the surface of the material. It is known to measure moisture levels in materials such as concrete by drilling a hole into a material and sealing a humidity probe or insert into the hole. The build up of humidity within the sealed hole or. within the moisture permeable material of the humidity probe or insert, is directly proportional to the moisture content in the concrete or other building material.
- apparatus for use in measuring moisture content at predetermined levels in a material such as concrete, the apparatus comprising an outer tube of impervious material closed at one end and having an opening at its opposite end for receipt of a humidity probe or a test body, said tube having sealing rings or bands on its exterior, at intervals along its length, dividing the tube into a plurality of sections at different distances from said opposite end, at least two of said sections having each a respective weakened region whereby a respective part of the wall of the tube in the respective section can be pressed out or punched out to leave a hole in the wall of the tube in said section, the wall of the tube, before any such part is thus pressed or punched out, is impervious to moisture, whereby a selected said part can be punched out of said tube, a bore drilled into the material to be assessed, from a surface of such material, to receive said tube as a close sealing fit with respect to said sealing rings or bands, leaving wall portions of said tube intermediate such sealing rings or bands spaced from the wall of
- FIGURE 1 is a view in a longitudinal section through an outer tube forming part of an apparatus embodying the invention
- FIGURE 2 shows the tube of Figure 1 in use, inserted within a hole bored in a concrete structure from an exposed surface of such structure, with a humidity probe inserted in the tube, and
- FIGURE 3 is a sectional view, similar to Figure 2, but showing the tube fitted with a sealing cap rather than with a humidity probe.
- Figure 1 shows in longitudinal section an outer tube 10 forming or forming part of an apparatus embodying the invention for use in measuring humidity at different levels in, for example, a concrete wall or floor.
- the tube 10 is formed of moisture impermeable and resistant material such as synthetic plastics and has a cylindrical wall 12 extending from an outer open end 14 of the tube to enclosed inner end 16.
- the tube has, on its exterior, at intervals along its length, circumferential ribs or bands 18 projecting radially outwardly from the remainder of the wall of the tube, whilst the tube is internally of substantially uniform diameter throughout its length.
- the ribs or bands 18 divide the tube into shorter sections and the wall of the tube, in each section, intermediate the rib or bands 18 bounding that section, has a respective region 22 which is of reduced wall thickness and which is readily pressed or punched out, or simply punctured, to form a hole in the wall 12 of that section. Similarly, such a region 24 of reduced thickness is formed in the inner end wall 16 of the tube. At its outer end, the tube has a collar or flange 26 extending radially outwardly therefrom.
- a bore 30 is drilled in the concrete or the like material in which the humidity is to be assessed, to a depth corresponding to, or somewhat greater than, the length of the tube 10 and of a diameter such that the ribs or bands 18 are a close or even a slight interference fit in the bore 30 so as to engage the wall of the bore substantially sealingly.
- a respective annular space which will, after an extended period, assume the same humidity as the concrete or the like immediately bounding that annular space.
- a suitable sealant may be applied to the exterior of the tube at the locations of the ribs or bands 18 between which the section concerned is defined.
- the weakened region 24 at the inner end of the tube 14 may be punched out or punctured.
- a weakened region 22 may be provided in the wall 12 of the tube between the flange 26 and the band 18 next to the flange.
- a probe of known kind may be inserted in the tube, as illustrated in Figure 2, the probe being connected by wires (not shown) for example to electronic sensing apparatus (not shown) for continuous or successive measurement of humidity.
- an O ring 32 may be provided, seated within a groove around the interior of the tube 10 adjacent its open end, for engagement with a probe 29 of the kind referred to above, to seal the probe with respect to the interior of the tube, or, as illustrated in Figure 4, for sealing engagement with a removable cap or plug 31, which may be applied to the tube after insertion of, for example, a moisture absorbent pellet which can be removed after it has reached equilibrium humidity with the interior of the tube, for measurement of the moisture content of the pellet by known means, in order to determine the relative humidity/moisture content of the interior of the tube.
Abstract
Apparatus for use in measuring moisture content at predetermined levels in a material such as concrete, comprises an outer tube (12) of impervious material closed at one end (16) and having an opening at its opposite end (14) for receipt of a humidity probe. The tube (12) has sealing rings or bands (18) on its exterior, at intervals along its length, dividing the tube into sections at different distances from end (14). At least two of these sections have each a respective weakened region (22) so that a selected region (22) can be pressed out or punched out to leave a hole in the wall of the tube. The wall of the tube, before any such part is thus pressed or punched out, is impervious to moisture. In use of the apparatus, a selected weakened region (22) can be punched out of the tube wall, a bore drilled into the material to be assessed, from a surface of such material, to receive the tube (12) as a close sealing fit with respect to the, sealing rings or bands (18), leaving wall portions of said tube intermediate the sealing rings or bands spaced from the wall of the bore and the tube and leaving the end (14) accessible from the material surface. A humidity probe is then introduced into tube (12) from the end (14) and sealed with respect to end (14) to allow the probe to equilibrate in humidity with the region of said material bounding the section of tube (12) in which the hole has been formed, before measuring the humidity by means of the probe.
Description
APPARATUS AND METHOD FOR MEASURING MOISTURE CONTENT IN CONCRETE
THIS INVENTION relates to apparatus for use in measuring moisture content in materials, particularly in building materials such as concrete. The apparatus of the invention is intended to facilitate measurement of the moisture content in, for example, a concrete wall or floor, at a predetermined depth or distance measured from the surface of the material. It is known to measure moisture levels in materials such as concrete by drilling a hole into a material and sealing a humidity probe or insert into the hole. The build up of humidity within the sealed hole or. within the moisture permeable material of the humidity probe or insert, is directly proportional to the moisture content in the concrete or other building material.
It is an object of invention to provide an improved apparatus which will facilitate the measurement of moisture content at different depths or layers of a building material such as concrete.
According to the invention, there is provided apparatus for use in measuring moisture content at predetermined levels in a material such as concrete, the apparatus comprising an outer tube of impervious material closed at one end and having an opening at its opposite end for receipt of a humidity probe or a test body, said tube having sealing rings or bands on its exterior, at intervals along its length, dividing the tube into a plurality of sections at different distances from said opposite end, at least two of said sections having each a respective weakened region whereby a respective part of the wall of the tube in the respective section can be pressed out or punched out to leave a hole
in the wall of the tube in said section, the wall of the tube, before any such part is thus pressed or punched out, is impervious to moisture, whereby a selected said part can be punched out of said tube, a bore drilled into the material to be assessed, from a surface of such material, to receive said tube as a close sealing fit with respect to said sealing rings or bands, leaving wall portions of said tube intermediate such sealing rings or bands spaced from the wall of said bore, the tube inserted in said bore leaving said opposite end accessible from said surface, and a humidity probe introduced into said tube from said opposite end thereof and sealed with respect to said opposite end to allow it to equilibrate in humidity with the region of said material bounding the said section of said tube in which such hole has been formed.
An embodiment of the invention is described below by way of example with reference to the accompanying drawings in which:
FIGURE 1 is a view in a longitudinal section through an outer tube forming part of an apparatus embodying the invention,
FIGURE 2 shows the tube of Figure 1 in use, inserted within a hole bored in a concrete structure from an exposed surface of such structure, with a humidity probe inserted in the tube, and
FIGURE 3 is a sectional view, similar to Figure 2, but showing the tube fitted with a sealing cap rather than with a humidity probe.
Referring to the drawings, Figure 1 shows in longitudinal section an outer tube 10 forming or forming part of an apparatus embodying the invention for use in measuring humidity at different levels in, for example, a concrete wall or floor. The tube 10 is formed of moisture impermeable and resistant
material such as synthetic plastics and has a cylindrical wall 12 extending from an outer open end 14 of the tube to enclosed inner end 16. The tube has, on its exterior, at intervals along its length, circumferential ribs or bands 18 projecting radially outwardly from the remainder of the wall of the tube, whilst the tube is internally of substantially uniform diameter throughout its length. The ribs or bands 18 divide the tube into shorter sections and the wall of the tube, in each section, intermediate the rib or bands 18 bounding that section, has a respective region 22 which is of reduced wall thickness and which is readily pressed or punched out, or simply punctured, to form a hole in the wall 12 of that section. Similarly, such a region 24 of reduced thickness is formed in the inner end wall 16 of the tube. At its outer end, the tube has a collar or flange 26 extending radially outwardly therefrom. In use, as illustrated in Figure 2, a bore 30 is drilled in the concrete or the like material in which the humidity is to be assessed, to a depth corresponding to, or somewhat greater than, the length of the tube 10 and of a diameter such that the ribs or bands 18 are a close or even a slight interference fit in the bore 30 so as to engage the wall of the bore substantially sealingly. As a result, as shown in Figure 2, there is defined, around each said section of the tube between the two bands 18 bounding that section and between the wall of the bore and the wall 12 of the tube, a respective annular space which will, after an extended period, assume the same humidity as the concrete or the like immediately bounding that annular space.
Where a selected one of the weakened regions 22 has been punctured or pressed out, to provide communication between the respective said annular space and the interior of the tube 10, if the outer end 14 of the tube 10 is sealed, e.g. by an insert or humidity probe 29 such as illustrated in Figure 2, or a plug such as illustrated in Figure 3, the whole interior of the tube and any moisture permeable material within the tube will also assume a corresponding humidity over an extended period of time. Thus, by selectively punching or pressing out
a region 22 at a selected depth along the tube, i.e. in a selected section, it is possible to ensure that the humidity within the tube corresponds to that at the position of the selected section having the punched out or punctured region 22.
If desired, in order to ensure adequate sealing of the selected section of the tube 12 with respect to the bore 30, a suitable sealant may be applied to the exterior of the tube at the locations of the ribs or bands 18 between which the section concerned is defined.
Where it is desired to asses the humidity at the inner end of the bore, i.e. at the depth of the bore, the weakened region 24 at the inner end of the tube 14 may be punched out or punctured. Similarly, such a weakened region 22 may be provided in the wall 12 of the tube between the flange 26 and the band 18 next to the flange. When the tube is installed in the bore, the flange may be sealed with respect to the surface of the concrete or the like using a suitable sealant.
For humidity assessment, a probe of known kind may be inserted in the tube, as illustrated in Figure 2, the probe being connected by wires (not shown) for example to electronic sensing apparatus (not shown) for continuous or successive measurement of humidity. As shown in Figure 34, an O ring 32 may be provided, seated within a groove around the interior of the tube 10 adjacent its open end, for engagement with a probe 29 of the kind referred to above, to seal the probe with respect to the interior of the tube, or, as illustrated in Figure 4, for sealing engagement with a removable cap or plug 31, which may be applied to the tube after insertion of, for example, a moisture absorbent pellet which can be removed after it has reached equilibrium humidity with the interior of the tube, for measurement of the moisture content of the pellet by
known means, in order to determine the relative humidity/moisture content of the interior of the tube.
In the present Specification "comprises" means "includes or consists of and "comprising" means "including or consisting of.
The features disclosed in the foregoing description, or the following Claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.
Claims
1. Apparatus for use in measuring moisture content at predetermined levels in a material such as concrete, the apparatus comprising an outer tube of impervious material closed at one end and having an opening at its opposite end for receipt of a humidity probe, said tube having sealing rings or bands on its exterior, at intervals along its length, dividing the tube into a plurality of sections at different distances from said opposite end, at least two of said sections having each a respective weakened region whereby a respective part of the wall of the tube in the respective section can be pressed out or punched out to leave a hole in the wall of the tube in said section, and wherein the wall of the tube, before any such part is thus pressed or punched out, is impervious to moisture, whereby a selected said part can be punched out of said tube, a bore drilled into the material to be assessed, from a surface of such material, to receive said tube as a close sealing fit with respect to said sealing rings or bands, leaving wall portions of said tube intermediate such sealing rings or bands spaced from the wall of said bore, the tube inserted in said bore leaving said opposite end accessible from said surface, and a humidity probe introduced into said tube from said opposite end thereof and sealed with respect to said opposite end to allow it to equilibrate in humidity with the region of said material bounding the said section of said tube in which such hole has been formed.
2. Apparatus for use in measuring moisture content at a predetermined level in a material such as concrete, the apparatus comprising an outer tube of impervious material closed at one end and having an opening at its opposite end for receipt of a humidity probe, said tube having at least two sealing rings or hands on its exterior, spaced apart along its length, defining, between said sealing ring or bands a section of the tube, having a hole in the wall of the tube in said section, and wherein the wall of the tube apart from said section, is impervious to moisture, whereby a bore can be drilled into the material to be assessed, from a surface of such material, to receive said tube as a close sealing fit with respect to said sealing rings or bands, leaving wall portions of said tube intermediate such sealing rings or bands spaced from the wall of said bore, the tube inserted in said bore leaving said opposite end accessible from said surface, and a humidity probe introduced into said tube from said opposite end thereof and sealed with respect to said opposite end to allow it to equilibrate in humidity with the region of said material bounding the said section of said tube in which such hole is located.
3. Apparatus according to Claim 1 or Claim 2 in combination with a complementary humidity probe sized for insertion in said tube via said open opposite end thereof.
4. Apparatus according to Claim 1 or Claim 3 when dependent on Claim 1 wherein said tube has, at said one closed end thereof, a weakened region whereby an end part of the tube can be pressed out or punched out to leave a hole in said end of the tube.
5. Apparatus according to any preceding claim wherein said outer tube has an outwardly extending collar or flange or at an adjacent said opposite open end, for engagement with the surface of a material into which a bore to receive the tube is formed, to provide a datum to ensure insertion to a standard depth and to facilitate sealing of the tube with respect to such bore, at the surface of such material.
6. A method of measuring moisture content at a predetermined level in a material such as concrete, with respect to a surface of such material, the method comprising drilling a bore into the material to be assessed, from said surface of such material, of a size to receive said tube of an apparatus according to Claim 1 or Claim 2 as a close sealing fit with respect to said sealing rings or bands, leaving wall portions of said tube intermediate such sealing rings or bands spaced from the wall of said bore, inserting said tube in said bore leaving said opposite end accessible from said surface, introducing a humidity probe into said tube from said opposite end thereof and sealing said probe with respect to said opposite end to allow it to equilibrate in humidity with the region of said material bounding the said section of said tube in which such hole has been formed before measuring said humidity by means of said probe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0311102.8 | 2003-05-14 | ||
| GB0311102A GB0311102D0 (en) | 2003-05-14 | 2003-05-14 | Apparatus for use in measuring moisture content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004102187A1 true WO2004102187A1 (en) | 2004-11-25 |
Family
ID=9958070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB2004/001836 WO2004102187A1 (en) | 2003-05-14 | 2004-04-29 | Apparatus and method for measuring moisture content in concrete |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB0311102D0 (en) |
| WO (1) | WO2004102187A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006060016A1 (en) * | 2004-12-02 | 2006-06-08 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| US7231815B2 (en) | 2004-12-02 | 2007-06-19 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| WO2007139533A1 (en) * | 2006-05-26 | 2007-12-06 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| US7658096B2 (en) * | 2008-02-27 | 2010-02-09 | Setra Systems, Inc. | Humidity sensing apparatus |
| US8047056B2 (en) | 2007-10-22 | 2011-11-01 | Construction Technology Laboratories, Inc. | Moisture vapor probe |
| CN103743893A (en) * | 2013-12-31 | 2014-04-23 | 清华大学 | Gradient measuring method of humidity of cement concrete pavement slab |
| CN103743496A (en) * | 2013-12-31 | 2014-04-23 | 清华大学 | Method for testing temperature gradient in cement concrete pavement slab |
| EP3933404A1 (en) | 2020-07-03 | 2022-01-05 | MeshWorks Wireless Oy | Measuring climate inside a longitudinal cavity of a structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641875A1 (en) * | 1986-12-08 | 1988-06-09 | Fraunhofer Ges Forschung | Method and device for continuously determining time-variable moisture distributions in components |
| DE4427244A1 (en) * | 1994-08-03 | 1996-02-08 | Prozesautomation Kohler Gmbh | Measuring physical and chemical parameters e.g. temp., resistance-conductivity or humidity, in building materials |
| WO1997045726A1 (en) * | 1996-05-24 | 1997-12-04 | Gerd Pleyers | Method and device for measuring moisture in building materials |
| WO1999064856A1 (en) * | 1998-06-05 | 1999-12-16 | Vaisala Oyj | Method and device for measuring moisture in structural material |
-
2003
- 2003-05-14 GB GB0311102A patent/GB0311102D0/en not_active Ceased
-
2004
- 2004-04-29 WO PCT/GB2004/001836 patent/WO2004102187A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641875A1 (en) * | 1986-12-08 | 1988-06-09 | Fraunhofer Ges Forschung | Method and device for continuously determining time-variable moisture distributions in components |
| DE4427244A1 (en) * | 1994-08-03 | 1996-02-08 | Prozesautomation Kohler Gmbh | Measuring physical and chemical parameters e.g. temp., resistance-conductivity or humidity, in building materials |
| WO1997045726A1 (en) * | 1996-05-24 | 1997-12-04 | Gerd Pleyers | Method and device for measuring moisture in building materials |
| WO1999064856A1 (en) * | 1998-06-05 | 1999-12-16 | Vaisala Oyj | Method and device for measuring moisture in structural material |
Non-Patent Citations (2)
| Title |
|---|
| "HM44 CONCRETE HUMIDITY MEASUREMENT SYSTEM", VAISALA PRODUCT CATALOG, 2003, pages 34 - 35, XP002291445, Retrieved from the Internet <URL:http://www.vaisala.com/DynaGen_Attachments/Att2444/HM44%20Brochure.pdf> [retrieved on 20040805] * |
| DATABASE WPI Section EI Week 199810, Derwent World Patents Index; Class S02, AN 1998-103337, XP002291520 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006060016A1 (en) * | 2004-12-02 | 2006-06-08 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| US7231815B2 (en) | 2004-12-02 | 2007-06-19 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| WO2007139533A1 (en) * | 2006-05-26 | 2007-12-06 | Construction Technology Laboratories, Inc. | Relative humidity probe for concrete |
| US8047056B2 (en) | 2007-10-22 | 2011-11-01 | Construction Technology Laboratories, Inc. | Moisture vapor probe |
| US7658096B2 (en) * | 2008-02-27 | 2010-02-09 | Setra Systems, Inc. | Humidity sensing apparatus |
| CN103743893A (en) * | 2013-12-31 | 2014-04-23 | 清华大学 | Gradient measuring method of humidity of cement concrete pavement slab |
| CN103743496A (en) * | 2013-12-31 | 2014-04-23 | 清华大学 | Method for testing temperature gradient in cement concrete pavement slab |
| CN103743893B (en) * | 2013-12-31 | 2015-08-19 | 清华大学 | A kind of Cement Concrete Pavement Slab humidity gradient method of testing |
| EP3933404A1 (en) | 2020-07-03 | 2022-01-05 | MeshWorks Wireless Oy | Measuring climate inside a longitudinal cavity of a structure |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0311102D0 (en) | 2003-06-18 |
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