CN1084966A - Directly measure the method and apparatus of bonding mortar strength - Google Patents
Directly measure the method and apparatus of bonding mortar strength Download PDFInfo
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- CN1084966A CN1084966A CN 92111473 CN92111473A CN1084966A CN 1084966 A CN1084966 A CN 1084966A CN 92111473 CN92111473 CN 92111473 CN 92111473 A CN92111473 A CN 92111473A CN 1084966 A CN1084966 A CN 1084966A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 67
- 238000010008 shearing Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000011449 brick Substances 0.000 claims description 12
- 230000006378 damage Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 241001504664 Crossocheilus latius Species 0.000 claims description 4
- 229910001651 emery Inorganic materials 0.000 claims description 4
- 241000272525 Anas platyrhynchos Species 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 2
- 239000004566 building material Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 4
- 238000012795 verification Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 239000010977 jade Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 208000001034 Frostbite Diseases 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of method and apparatus of direct measurement bonding mortar strength belongs to construction work masonry mortar joint mortar field tests.This method is to take out the mortar sheet from masonry, is subjected to shear load, destroys until the mortar sheet, measure the physical dimension of destroying section, calculate cross-sectional area S and shearing strength τ, measure cube compressive strength f simultaneously, utilize the experimental formula of the correlationship foundation of τ and f to calculate cube compressive strength.The equipment of realizing its method is strength testing device and calibration position thereof, and strength testing device comprises frame, blade loading assembly and gauge assembly, and caliberating device is used for the demarcation and the verification of strength testing device.The present invention can be used for the test of the masonry mortar joint mortar of various situations, and the measuring accuracy height.
Description
The invention belongs to construction work masonry mortar joint mortar strength field tests.
Masonry project design and construction acceptance specification regulation is with the foundation of mortar standard cube body test block compressive strength as mortar joint mortar strength in the masonry.Current measuring methods mainly contains:
(1) " extrusion method "." on-the-spot test of compression strength of building mortar method and device " (publication number CN1050767) as Patent Office of the People's Republic of China's 91,4,17 bulletins, be on masonry, to specify a release brick, small-sized ejecting device is installed on the release brick, brick is released in loading, read its thrust magnitude by test instrumentation, the experimental formula that substitution is set up is in advance tried to achieve mortar compressive strength.
(2) " original position shearing method and method of powder actuated shot ".See Patent Office of the People's Republic of China 39,12,27 disclosed " a kind of method and apparatus of direct measurement masonry mortar joint intensity " (publication number CN1038535).Method of powder actuated shot is to utilize one piece of nail with quantitative kinetic energy, and it is injected in the mortar joint, judges the compressive strength of mortar according to the degree of depth of injecting.The original position shearing method is that boxshear apparatus is embedded by the tested masonry brick, excavates the other end mortar joint of brick, applies load with miniature jack pair brick, and mortar joint is cut, and reads shearing strength from dynamometer.
Said method is difficult to get rid of the influence of various factorss such as masonry quality to testing precision, and accuracy is lower.
The object of the present invention is to provide a kind of new method and apparatus of directly on the masonry mortar joint, measuring mortar cube compressive strength, to improve test accuracy.
Technical scheme of the present invention is such.The ultimate principle of directly measuring mortar sheet intensity is: the mortar sheet that takes out from masonry bears the beam type shear load, loading speed height when the loading speed of shear load P is the 15N/S-4N/S(high grade, loading speed is low during low grade), cut destruction until the mortar sheet.Measure the physical dimension of destroying section, calculate cross-sectional area S, and then calculate the shearing strength τ of mortar sheet, measure simultaneously and cube compressive strength f of this mortar sheet with condition, utilize the correlationship of τ and f, set up empirical Calculation formula between the two, utilize experimental formula to calculate cube compressive strength.
The equipment of realizing masonry horizontal mortar joint mortar sheet shearing method is strength testing device and caliberating device thereof.Strength testing device is used to implement the mortar sheet to be sheared, and caliberating device is used for strength testing device demarcation before enabling and the periodic check that uses done metering for the value of the shear load P of strength testing device and traced to the source.Strength testing device comprises frame, shear-blade loading assembly and gauge assembly.Shear-blade loading assembly comprises cutter, bottom knife, knife bar, worktable and rest pad.Blade application of force width b determines, should guarantee the carrying out of shearing test, and the part that does not produce the mortar sheet is damaged by pressure.Centre distance a between the upper and lower shear-blade will give strict location, the strength testing device of batch process, and a value is controlled at a
± 0.1Within the millimeter, make the shearing test of mortar sheet be fixed on unified being subjected under the force mode.The adjustable height of shear-blade is with the variation of the variable thickness that adapts to tested mortar sheet.The level inclination scalable of shear-blade can be tested the mortar sheet of section and non-rectangle.In the test, but bottom knife automatic fine tuning coincide blade and mortar sheet all the time and is adjacent to.Gauge assembly comprises hydraulic unit and tensimeter, and the pipeline of hydraulic unit must join with bottom knife, to guarantee test accuracy.Caliberating device is the instrumentation supporting with strength testing device, and this device comprises frame, balanced component and loading dynamometry assembly.The effect of balanced component is the deadweight that balances all annexes that comprise dynamometer, only makes the elastic deformation force of dynamometer put on the strength testing device bottom knife.Dynamometer adopts grade IIIstandard dynamometer.Before dynamometer is enabled and in using, should send regularly in accordance with regulations that the verification of local metrological service is qualified can be used.
The step of demarcating strength testing device with caliberating device is:
(1) leveling caliberating device makes air level placed in the middle;
(2) strength testing device is placed on the base plate of caliberating device, and the leveling strength testing device, make the air level on the strength testing device base plate placed in the middle;
(3) tension metrics of placing caliberating device is cut or polish jade with an emery wheel, and makes third-class dynamometer show the elastic deformation force of 40N;
(4) application of force edge of a knife of caliberating device is acted on the bottom knife center of strength testing device;
(5) apply the demarcation load to strength testing device step by step, read the lattice number that tensimeter is walked about simultaneously;
(6) under every grade of load, in total travel, divide 5 demarcation to hydraulic cylinder;
(7) return out the load computing formula:
In the P=a+bn formula: P-acts on the load on the strength testing device bottom knife, the N of unit; The constant that a, b-regretional analysis draw; N-pressure form number.
The step of measuring masonry mortar cube compressive strength with strength testing device is:
(1) on the masonry of sampling point, makes a call to a duck eye, on the horizontal mortar joint of six brick faces, respectively get a mortar sheet, polish a little with emery wheel;
(2) leveling strength testing device makes air level placed in the middle;
(3) the mortar sheet is placed on rest pad and the bottom knife;
(4) adjust height and the horizontal inclination angle of cutter, make the edge of a knife and mortar sheet identical and compress bottom knife edge of a knife visual derection level;
(5) speed in accordance with regulations applies shear load and destroys until test specimen;
(6) six mortar sheets shear test successively finish, and by formula P=a+bn calculates shear failure load P, calculate cross-sectional area S by the destruction cross dimensions of mortar sheet;
(7) by formula τ=P/S calculates the shearing strength of mortar sheet;
(8) by formula:
<math>i = l / 6 <SUM><FROM>i = 1<TO>6<OF> τ l </SUM></math> Calculate the average shearing strength of 6 mortar sheets;
(9) f=a(τ by formula
2-b
2)
CCalculate and the standard cube body compressive strength of masonry mortar sheet with the mortar specimen of condition.The average shearing strength of τ in the formula-six mortar sheet.Cube compressive strength of one group of (six) test cube in the same condition of f-.
The technical indicator of this computing formula is (to a brick setting):
The index of correlation: Y=0.99;
Average relative error: δ=± 8.63%;
Relative standard deviation: S
f=14.9%;
Surveying strong scope is M
0.4-M
20
The present invention has following advantage:
1, purposes is in extensive range.
(1) can be used for lime, cement, mixed mortar (M in all kinds of masonries
0.4-M
20) intensity test;
(2) test that can be used for suffering chemical corrosion or fire and suffer the special status mortar of frostbite between hardening period;
(3) can be used for the test of the mortar strength in any length of time.
2, test position fix strictness, measuring accuracy height.
The upper and lower shear-blade centre distance of strength testing device a=2.3 ± 0.06 millimeter, under the situation of blade width b=1.8 ± 0.02 millimeter, adopt the hydraulic pressure loading, two 0-4 level precision pressure gauges metering dynamometry.The dynamometry relative error δ of this strength testing device is:
During 20≤P≤40(N), | δ |≤6%
During 40≤P≤100(N), | δ |≤4%
During 100＜P≤2000(N), | δ |≤2%
3, but strength testing device attaches caliberating device periodic check strength testing device, thereby has ensured the measuring accuracy of strength testing device.
Apparatus embodiments of the present invention is illustrated in conjunction with the accompanying drawings.
Fig. 1 is a strength testing device synoptic diagram of the present invention (Figure of abstract).
Fig. 2 is the side view of Fig. 1 strength testing device.
Fig. 3 is a caliberating device synoptic diagram of the present invention.
Fig. 4 is the side view of Fig. 3 caliberating device.
As shown in Figure 1 and Figure 2, strength testing device comprises frame, shear-blade loading assembly and gauge assembly. Frame comprises top board (15), side plate (16) and base plate (19). Shear-blade loading assembly comprises cutter (2), bottom knife (3), liftable two knife bars (11), workbench (14) and rest pad (17). Gauge assembly comprises Pressure gauge (7) and hydraulic unit, and hydraulic unit is made of oil pump (5), jack (6), valve (8) and oil pipe (9). Pressure gauge has two, and test specification is respectively 0-0.16MPa and 0-1MPa. Adjustable cutter locating piece (12) and bottom knife positioning bead (13) are housed on the side plate (16), leveling nut (10) is housed on the base plate (19). Knob (1) is housed on the knife bar (11), and the two is threaded. Cutter and cutter Adopt pin to be connected between the piston rod of bar (11), bottom knife and jack (6). (4) be the oil pump knob, (18) are the oil pump piston bar. During use, turn leveling nut (10) makes air level placed in the middle, base plate (19) level; The mortar sheet is kept flat on the cutting edge of rest pad (17) and bottom knife (3); Turn knob (1), knife bar (11) descends, and makes upper and lower blade pressing mortar sheet; Turn oil pump knob (4) descends oil pump piston bar (18), gives jack (6) pressurization, and bottom knife (3) rises, until test specimen destroys; Read manometric lattice and count n, utilize formula P=a+bn to calculate failing load; When mortar sheet intensity was high, the knob (14) on the turn valve (8) was closed the 0-0.16MPa Pressure gauge, utilized the test of 0-1MPa Pressure gauge.
As shown in Figure 3, Figure 4, caliberating device comprises frame, balanced component and loading dynamometry assembly. Frame comprises top board (8), vertical rod (9) and base plate (10), balanced component comprises pulley (2), connecting plate (4) and standard stone roller (7), loading dynamometry assembly comprises that on screw rod (1), nut (6), dynamometer (3) and knife bar (11) knife bar (11) cutter being housed holds (12), leveling nut (13) is housed on the base plate (10), and the stone roller dish of placement standard stone roller (7) is connected with connecting plate (14) with connecting rod (15) by marline. (5) be the bottom knife of strength testing device. During use, turn leveling nut (13) makes air level placed in the middle, base plate (10) level; Dynamometer (3) is placed between connecting plate (4) and the screw rod (1), simultaneously standard is cut or polish jade with an emery wheel (7) and be placed on Tuo Panshang, the dynamometer indicated value is 4N, cutter is held the shoulder (14) that (12) be placed on strength testing device bottom knife (5) and locates, and the jackscrew that cutter is held (12) screws; Strength testing device is put into marking apparatus, make cutter hold (12) and contact the leveling strength testing device with the cutting edge of knife bar (11); Turn nut (6) descends screw rod (1), and the show value that makes dynamometer (3) is the fixed point power value P of metrological service's calibrating.
The embodiment of the inventive method is described as follows:
One, sampling
1, quantity of sampling quantity should be determined by existing masonry construction and acceptance specification (GBJ203-83), but must not be less than two groups (6 every group);
2, sampling point should be determined at random or be special definite;
3, after sampling point is determined, should on the masonry at tested position, make a call to a duck eye, retract 6 bricks, on every brick, strip a slice mortar sheet (size is not limit).
4, mortar sheet processing: with the green silicon carbide grinding wheel of diameter, polish a little, be convenient to test and measure size get final product greater than 25 centimetres.
Two, test
1, leveling instrument makes air level placed in the middle;
2, the mortar sheet that processes is positioned between the upper and lower blade of strength testing device, and turn knife bar knob compresses the mortar sheet, makes down the edge of a knife be in the basic horizontal position, and tensimeter shows certain initial reading.Turn oil pump knob, cutter rises, and cuts off until test specimen;
3,, use table greatly to high grade mortar or large scale mortar sheet; To low grade mortar or small size mortar sheet, use little table.When little table is stopped using, answer valve-off, in order to avoid damage tensimeter;
When 4, using big showing, loading speed is about 1.5 lattice/seconds; When using little table, loading speed is about 2 lattice/seconds.Loading should be slowly steady, when changing hand, and intermittently about 1.5 seconds.
Three, pressure gauge reading and failing load calculate
1, test specimen destroys, and passive indicator keeps, and reading is unit with lattice, estimates reading to the radix point;
2, failing load calculates with formula P=a+bn;
3, failing load is unit with N, is calculated to behind the radix point one.
Four, measuring with area of cross dimensions of mortar sheet destruction calculated
1, the generous size of mortar sheet is measured by destroying section, is unit with the millimeter, estimates reading to the radix point;
2, measure the mortar sheet and destroy cross dimensions, with vernier caliper or Steel Ruler, thickness should be measured with vernier caliper;
3, size is measured number, and should look the destruction section and determine flexibly, be principle with the standard area, general width and thickness respectively are no less than two data;
4, destroying cross-sectional area is unit with the square millimeter, calculates to the radix point one.
Five, mortar sheet shear Strength Calculation
1, mortar sheet shearing strength is unit with MPa, is calculated to behind the radix point one;
2, calculate with formula τ=P/S.
Six, mortar sheet cubic compressive strength calculates
1, mortar cube compressive strength is unit with MPa, is calculated to behind the radix point one;
2, mortar cubic compressive strength formula f=a(τ
2-b
2)
CCalculate.In the formula: the average shearing strength of τ-a group of (6) mortar sheet; A, b, c-formula experience factor are (to brick setting a=7.428, b
2=0.02, c=0.478);
3, the average shearing strength formula of mortar
Calculate.The shearing strength of a slice mortar sheet in 6 mortar sheets that τ in the formula-same sampling point strips;
4, f=7.428(τ by formula
2-0.02)
0.478Calculate and the standard cube body compressive strength of masonry mortar sheet with the mortar specimen of condition.
Claims (3)
1, a kind of method of direct measurement bonding mortar strength, it is characterized in that directly measuring the shearing strength of the horizontal mortar joint mortar sheet that from masonry, takes out with strength testing device, the loading speed of shear load P is 15N/S-4N/S, cut destruction until the mortar sheet, measure the physical dimension that it destroys section, calculate cross-sectional area S, and then calculate the shearing strength τ of mortar sheet, measure simultaneously and cube compressive strength f of this mortar sheet with the mortar specimen of condition, utilize the good correlationship of τ and f, set up experimental formula between the two, utilize experimental formula to calculate cube compressive strength.
2, a kind of equipment of direct measurement bonding mortar strength, this equipment comprises strength testing device and caliberating device thereof, it is characterized in that:
A. strength testing device comprises frame, shear-blade loading assembly and gauge assembly, frame comprises top board (15), side plate (16) and base plate (19), shear-blade loading assembly comprises cutter (2), bottom knife (3), knife bar (11), worktable (14) and rest pad (17), and gauge assembly comprises tensimeter (7) and hydraulic unit (also available other force transducer);
B. caliberating device comprises frame, balanced component and loading dynamometry assembly, and frame comprises top board (8), vertical rod (9) and base plate (10), and balanced component comprises pulley (2), web joint (4) and standard stone roller (7).Loading dynamometry assembly comprises screw rod (1), nut (6), knife bar (11) and dynamometer (3).
3, the method for direct measurement mortar strength according to claim 1 is characterized in that the step of measuring mortar strength with strength testing device is:
(1) on the masonry of sampling point, makes a call to a duck eye, on the horizontal mortar joint of six brick faces, respectively get a mortar sheet, polish a little with emery wheel;
(2) leveling strength testing device makes air level placed in the middle;
(3) the mortar sheet is placed on rest pad and the bottom knife;
(4) adjust height and the horizontal inclination angle of cutter, make the edge of a knife and mortar sheet identical and compress bottom knife edge of a knife visual derection level;
(5) speed in accordance with regulations applies shear load and destroys until test specimen;
(6) six mortar sheets are after shear test finishes successively, the constant that P=a+bn(a, b-regretional analysis by formula draws, n-pressure form number) calculate shear failure load P, calculate cross-sectional area S by the destruction cross dimensions of mortar sheet;
(7) by formula τ=P/S calculates the shearing strength of mortar sheet;
(8) by formula:
Calculate the average shearing strength of 6 mortar sheets;
(9) f=a(τ by formula
2-b
2)
C(the average shearing strength of τ-six mortar sheet, cube compressive strength of f-group (six) test cube in the same condition) is calculated and the standard cube body compressive strength of masonry mortar sheet with the mortar specimen of condition.
In the formula, a, b, c are the experience factor relevant with building material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92111473A CN1067766C (en) | 1992-09-30 | 1992-09-30 | Directly measuring bonding mortar strength method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92111473A CN1067766C (en) | 1992-09-30 | 1992-09-30 | Directly measuring bonding mortar strength method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084966A true CN1084966A (en) | 1994-04-06 |
| CN1067766C CN1067766C (en) | 2001-06-27 |
Family
ID=4945358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92111473A Expired - Fee Related CN1067766C (en) | 1992-09-30 | 1992-09-30 | Directly measuring bonding mortar strength method and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067766C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865801A (en) * | 2010-06-08 | 2010-10-20 | 铁道第三勘察设计院集团有限公司 | Strain fully-automatic twin unconfined compressor |
| CN102494815A (en) * | 2011-11-07 | 2012-06-13 | 同济大学 | Different material interface test device under uniformly distributed load and photoelastic test method |
| CN102042932B (en) * | 2009-10-23 | 2013-12-04 | 江苏省建筑科学研究院有限公司 | Instrument for detecting mortar strength by pressure selecting method |
| CN104568584A (en) * | 2014-12-12 | 2015-04-29 | 广西科技大学 | Method for testing compressive strength of municipal sludge sintered shale perforated brick |
| CN104568583A (en) * | 2014-12-12 | 2015-04-29 | 广西科技大学 | Method for testing compressive strength of urban sludge sintered shale solid brick |
| CN116413133A (en) * | 2023-06-06 | 2023-07-11 | 张家港广大特材股份有限公司 | Compressive strength monitoring method and system for special steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050767A (en) * | 1990-11-20 | 1991-04-17 | 河南省建筑科学研究所 | On-the-spot test of compression strength of building mortar method and device |
| CN1062789A (en) * | 1990-12-27 | 1992-07-15 | 宁夏回族自治区建筑工程研究所 | The method of measuring and calculating mortar cubic compressive strength on masonry |
-
1992
- 1992-09-30 CN CN92111473A patent/CN1067766C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042932B (en) * | 2009-10-23 | 2013-12-04 | 江苏省建筑科学研究院有限公司 | Instrument for detecting mortar strength by pressure selecting method |
| CN101865801A (en) * | 2010-06-08 | 2010-10-20 | 铁道第三勘察设计院集团有限公司 | Strain fully-automatic twin unconfined compressor |
| CN101865801B (en) * | 2010-06-08 | 2012-06-06 | 铁道第三勘察设计院集团有限公司 | Strain fully-automatic twin unconfined compressor |
| CN102494815A (en) * | 2011-11-07 | 2012-06-13 | 同济大学 | Different material interface test device under uniformly distributed load and photoelastic test method |
| CN102494815B (en) * | 2011-11-07 | 2013-10-30 | 同济大学 | Different material interface test device under uniformly distributed load and photoelastic test method |
| CN104568584A (en) * | 2014-12-12 | 2015-04-29 | 广西科技大学 | Method for testing compressive strength of municipal sludge sintered shale perforated brick |
| CN104568583A (en) * | 2014-12-12 | 2015-04-29 | 广西科技大学 | Method for testing compressive strength of urban sludge sintered shale solid brick |
| CN116413133A (en) * | 2023-06-06 | 2023-07-11 | 张家港广大特材股份有限公司 | Compressive strength monitoring method and system for special steel |
| CN116413133B (en) * | 2023-06-06 | 2023-10-24 | 张家港广大特材股份有限公司 | Compressive strength monitoring method and system for special steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1067766C (en) | 2001-06-27 |
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