CN103424354B - A kind of method detecting the anti-villaumite performance of reinforced concrete cement based cushion block - Google Patents
A kind of method detecting the anti-villaumite performance of reinforced concrete cement based cushion block Download PDFInfo
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- CN103424354B CN103424354B CN201310339775.7A CN201310339775A CN103424354B CN 103424354 B CN103424354 B CN 103424354B CN 201310339775 A CN201310339775 A CN 201310339775A CN 103424354 B CN103424354 B CN 103424354B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004568 cement Substances 0.000 title claims abstract description 16
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 130
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 230000037427 ion transport Effects 0.000 claims abstract description 28
- 230000035699 permeability Effects 0.000 claims abstract description 22
- 238000011056 performance test Methods 0.000 claims abstract description 8
- 238000013459 approach Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 238000012372 quality testing Methods 0.000 abstract description 4
- 238000001723 curing Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001804 chlorine Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a kind of method detecting the anti-villaumite performance of reinforced concrete cement based cushion block, comprise the following steps: (1) choose or prepare suitable size cushion block as cushion block to be measured; (2) cushion block to be measured is placed in the middle of die trial, builds anti-villaumite concrete, obtain cushion block-anti-villaumite Combined concrete body test specimen; Prepare simultaneously same size without the anti-villaumite concrete sample of cushion block sample as a comparison; (3) by after two kinds of test specimen standard curings to the length of time, upwards intercept from bottom surface respectively and prepare sample; (4) RCM method or electricity overall approach is adopted to carry out anti-villaumite performance test to two kinds of samples; (5) the anti-villaumite performance of cushion block is judged according to the chloride permeability degree of depth and chloride ion transport coefficient.This method directly can measure the anti-villaumite performance of cushion block, and judges whether cushion block is applicable in corresponding anti-villaumite concrete, thus provides technical support for the quality testing of cushion block product and control.
Description
Technical field
The present invention relates to the detection field of building materials, particularly a kind of method detecting the anti-villaumite performance of reinforced concrete cement based cushion block.
Background technology
The xoncrete structure performance that under bar in chlorine salt solution, steel bar corrosion causes is degenerated and even failure damage, and become whole world common concern and become increasingly conspicuous one large disaster, the destruction situation that China coast engineering causes due to steel bar corrosion is also very serious.
The approach improving concrete structure durability under bar in chlorine salt solution comprises basic measures and addition thereto, and basic measures adopt anti-villaumite concrete and improve protective layer thickness.Wherein protective layer thickness is the key factor affecting concrete structure durability, and the relation of itself and endurance life the chances are quadratic relationship, namely protective layer thickness doubles, and endurance life about increases by four times.
In Practical Project, the protective layer thickness of reinforced concrete structure is controlled by cushion block.Cushion block is placed between reinforcing bar and template, forms protective seam after casting concrete, make reinforcing bar and concrete surface spaced apart.Because cushion block finally forms a part for protective seam, therefore the anti-villaumite performance of cushion block is the key factor affecting reinforced concrete structure durability.The cushion block mainly cement based cushion block of current use, comprises cement paste cushion block, mortar pad, fibre mortar cushion block, pea gravel concreten cushion block, fiber finer stone concrete cushion block etc.
China is on the basis of summing up domestic and international achievement in research, JTJ/T275-2000 " concrete for marine works structural anticorrosion erosion technical manual ", CCES01-2004 " durability design and construction guidbook ", JTG/T B07-01-2006 " highway engineering xoncrete structure anticorrosion technique specification " are in succession issued, the standard criterions such as JGJ/T193-2009 " concrete durability check evaluation criterion " and GB/T50476-2008 " durability design specification ".The survey and valuation resisting the concrete anti-villaumite performance of villaumite in these specifications has had clear and definite regulation.But these specifications do not specify the anti-villaumite performance of cement based cushion block, also the anti-villaumite method for testing performance of cushion block is not specified.
There is a small amount of engineering can detect the anti-villaumite performance of cement based cushion block at present, but not directly cushion block is detected, but adopt starting material and the match ratio of cushion block, production standard test specimen, after standard curing to certain length of time, anti-villaumite performance test is carried out to standard specimen.But the cushion block of actual production is often very short for the length of time, and its performance and standardized test sample of maintenance exist larger difference, and the testing result of standard specimen can not reflect the performance of cushion block.And this method also cannot detect the anti-villaumite performance of actual cushion block, the quality testing for cushion block product is not known where to begin with controlling yet.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough, the object of the present invention is to provide a kind of method detecting the anti-villaumite performance of reinforced concrete cement based cushion block, directly can measure the anti-villaumite performance of cushion block, and judge whether cushion block is applicable in corresponding anti-villaumite concrete, thus provide technical support for the quality testing of cushion block product and control.
Object of the present invention is achieved through the following technical solutions:
Detect a method for the anti-villaumite performance of reinforced concrete cement based cushion block, comprise the following steps:
(1) round the cushion block part as cushion block to be measured or cutting cushion block as cushion block to be measured, cut the cushion block to be measured obtained and have at least surface to be original side; Described original side is the side of uncut cushion block;
(2) cushion block to be measured is placed on the length of side and is more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm, the bottom surface of cushion block to be measured contacts with die trial bottom surface, build the anti-villaumite concrete that thickness is more than or equal to 70mm, obtain cushion block-anti-villaumite Combined concrete body test specimen; Simultaneously preparation size identical with cushion block-anti-villaumite Combined concrete body test specimen without the anti-villaumite concrete sample of cushion block; Anti-villaumite concrete in described cushion block-anti-villaumite Combined concrete body test specimen is with identical with match ratio without the anti-villaumite concrete raw material in cushion block anti-villaumite concrete sample;
(3) by cushion block-anti-villaumite Combined concrete body test specimen with without after the standard curing to the length of time of cushion block anti-villaumite concrete sample, respectively from cushion block-anti-villaumite Combined concrete body test specimen with upwards intercept without the bottom surface of cushion block anti-villaumite concrete sample and prepare cushion block-anti-villaumite Combined concrete body sample and without the anti-villaumite concrete sample of cushion block;
(4) adopt RCM method or electricity overall approach to cushion block-anti-villaumite Combined concrete body sample and carry out anti-villaumite performance test without cushion block anti-villaumite concrete sample, measure the maximum chloride permeability degree of depth, the average chloride permeability degree of depth, and calculate chloride ion transport coefficient;
(5) according to cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance judging cushion block without the chloride permeability degree of depth of cushion block anti-villaumite concrete sample and chloride ion transport coefficient:
When the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample is less than or equal to 1.20 times of the chloride ion transport coefficient without the anti-villaumite concrete sample of cushion block, and the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample lower than anti-villaumite Concrete Design value time, cushion block meets anti-villaumite performance requirement;
When the original side of cushion block to be measured in cushion block-anti-villaumite Combined concrete body sample and the maximum chloride permeability degree of depth of anti-villaumite concrete intersection are greater than 1.50 times of the average chloride permeability degree of depth of whole cushion block-anti-villaumite Combined concrete body sample, then expression cushion block is with anti-villaumite concrete in conjunction with bad, need carry out surface treatment to cushion block.
Round the cushion block part as cushion block to be measured or cutting cushion block described in step (1) as cushion block to be measured, cutting obtains the original side of part that cushion block to be measured remains with cushion block, is specially:
The height of cushion block to be measured is more than or equal to 35mm, and bottom surface point-to-point transmission ultimate range is less than or equal to 80mm;
When rounding cushion block and being cushion block to be measured, when cushion block to be measured is vertically placed, horizontally-projected area is between 1600mm
2~ 3000mm
2between;
When a part for cutting cushion block is as cushion block to be measured, when cushion block to be measured is vertically placed, horizontally-projected area is 2500 ± 500mm
2.
Cushion block to be measured is placed on the length of side and is more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm, be specially:
Cushion block to be measured is placed on the length of side and is more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm, and the bottom surface of cushion block to be measured is positioned at the central authorities of die trial bottom surface, contacts with die trial bottom surface.
Compared with prior art, the present invention has the following advantages and beneficial effect:
The present invention adopts electric accelerated process, by carrying out the anti-villaumite performance of comprehensive evaluation cushion block to cushion block-anti-villaumite Combined concrete body, the chloride permeability degree of depth contrasting sample without the anti-villaumite concrete of cushion block and chloride ion transport coefficient, directly can measure the anti-villaumite performance of cement based cushion block, and judge whether this cushion block is applicable in corresponding anti-villaumite concrete, thus provide technical support for the quality testing of cushion block product and control.
Accompanying drawing explanation
Fig. 1 is the cushion block to be measured of embodiments of the invention 1 and the schematic diagram of die trial.
Fig. 2 is the schematic diagram of the cushion block-anti-villaumite Combined concrete body test specimen of embodiments of the invention 1.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
The method of the anti-villaumite performance of detection reinforced concrete cement based cushion block of the present embodiment, comprises the following steps:
(1) cushion block of the present embodiment is height 40mm, upper bottom surface Φ 30mm, and the circular platform type mortar pad of bottom surface Φ 50mm, rounding a cushion block as cushion block to be measured, without the need to carrying out cutting processing, can retain whole original sides.
(2) as shown in Figure 1, cushion block 2 to be measured is placed in the middle of 100mm × 100mm × 100mm cube die trial 1, the bottom surface of cushion block 2 to be measured is positioned at the central authorities with die trial 1 bottom surface, and contact with die trial bottom surface, pour into anti-villaumite concrete that thickness is 100mm again and jolt ramming is shaping, obtain cushion block-anti-villaumite Combined concrete body test specimen as shown in Figure 2; Simultaneously preparation size identical with cushion block-anti-villaumite Combined concrete body test specimen without the anti-villaumite concrete sample of cushion block; Anti-villaumite concrete in described cushion block-anti-villaumite Combined concrete body test specimen is with identical with match ratio without the concrete raw material in cushion block anti-villaumite concrete sample.The concrete anti-villaumite performance requirement of this anti-villaumite known is: 28d chloride ion transport coefficient≤5.0 × 10
-12m
2/ s.Test specimen standard curing length of time is 28d.
(3) by cushion block-anti-villaumite Combined concrete body test specimen with carry out standard curing without the anti-villaumite concrete sample of cushion block, 1d processes test specimen before the test: upwards intercept from cushion block-anti-villaumite Combined concrete body test specimen and the bottom surface without the anti-villaumite concrete sample of cushion block respectively and prepare highly for the cushion block-anti-villaumite Combined concrete body sample of (50 ± 2) mm and without the anti-villaumite concrete sample of cushion block, then adopting waterproof abrasive paper and smooth file are polished smooth by specimen surface and are cleaned up by chip.And vacuum is carried out to sample to satisfy water.
(4) the electricity overall approach specified according to DB44/T1115-2013 " anti-villaumite low-heat portland cement " appendix A carries out cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance test without cushion block anti-villaumite concrete sample, during experiment, the contact of sample bottom surface is containing the solution of NaCl, measure the maximum chloride permeability degree of depth, the average chloride permeability degree of depth, and calculate chloride ion transport coefficient.Carrying out in anti-villaumite performance test, when noting riving sample, cushion block should made therefrom to rive.
(5) according to cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance judging cushion block without the chloride permeability degree of depth of cushion block anti-villaumite concrete sample and chloride ion transport coefficient, criterion is: when the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample is less than or equal to 1.20 times of the chloride ion transport coefficient without the anti-villaumite concrete sample of cushion block, and the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample lower than anti-villaumite Concrete Design value time, cushion block meets anti-villaumite performance requirement; When the original side of the cushion block to be measured in cushion block-anti-villaumite Combined concrete body sample, (this enforcement to execute in example cushion block without cutting, original side is the side of cushion block to be measured) be greater than 1.50 times of the average chloride permeability degree of depth of whole cushion block-anti-villaumite Combined concrete body sample with the maximum chloride permeability degree of depth of anti-villaumite concrete intersection, then represent cushion block with anti-villaumite concrete in conjunction with bad;
The test result of the present embodiment is:
The chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample is 4.96 × 10
-12m
2/ s, the chloride ion transport coefficient without the anti-villaumite concrete sample of cushion block is 4.55 × 10
-12m
2/ s.The chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample is 1.09 times without the anti-villaumite concrete sample of cushion block, is less than 1.20 times, and is less than 5.0 × 10
-12m
2the designing requirement of/s, this cushion block can meet this concrete anti-villaumite performance requirement;
The maximum chloride permeability degree of depth of cushion block-original side of anti-villaumite Combined concrete body sample and concrete intersection is 22.05mm, sample mean length of penetration is 13.45mm, the maximum chloride permeability degree of depth is 1.64 times of mean penetration depth, be greater than 1.50 times, illustrate that the side of cushion block and this kind of concrete are in conjunction with bad, chlorion can invade from their combination interface, needs to carry out certain process to ensure to be combined closely with concrete to the surface of cushion block.
Embodiment 2
(1) cushion block of the present embodiment is the quincunx cushion block of height 60mm, and when cushion block is vertically placed, horizontally-projected area is about 5000mm
2, because cushion block projected horizontal area is greater than 3000mm
2, need vertically to cut, get about half cushion block and test as cushion block to be measured, after cutting, cushion block projected horizontal area is about 2500mm
2, cushion block to be measured is except cut surface, and all the other sides are original side; Described original side is the side of uncut cushion block;
(2) cushion block to be measured is placed in the middle of the die trial of Φ 100mm × 100mm right cylinder, the bottom surface of cushion block to be measured is positioned at the central authorities of die trial bottom surface, and contact with die trial bottom surface, then pour into anti-villaumite concrete that thickness is 80mm and jolt ramming is shaping, obtain cushion block-anti-villaumite Combined concrete body test specimen; Simultaneously preparation size identical with cushion block-anti-villaumite Combined concrete body test specimen without the anti-villaumite concrete sample of cushion block; Anti-villaumite concrete in described cushion block-anti-villaumite Combined concrete body test specimen is with identical with match ratio without the concrete raw material in cushion block anti-villaumite concrete sample.The concrete anti-villaumite performance requirement of this anti-villaumite known is: 56d chloride ion transport coefficient is less than or equal to 7.0 × 10
-12m
2/ s.Test specimen standard curing length of time is 56d.
(3) by cushion block-anti-villaumite Combined concrete body test specimen with carry out standard curing without the anti-villaumite concrete sample of cushion block, 7d processes test specimen before the test: upwards intercept from cushion block-anti-villaumite Combined concrete body test specimen and the bottom surface without the anti-villaumite concrete sample of cushion block respectively and prepare highly for the cushion block-anti-villaumite Combined concrete body sample of (50 ± 2) mm and without the anti-villaumite concrete sample of cushion block, then adopting waterproof abrasive paper and smooth file are polished smooth by specimen surface and are cleaned up by chip.The test specimen processed carries out vacuum and to satisfy water after should continuing to be immersed in water maintenance to test length of time.
(4) cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance test without cushion block anti-villaumite concrete sample is carried out according to the quick chloride ion transport Y-factor method Y (or claiming RCM method) of regulation in GB/T50082-2009 " Standard for test methods of longterm performance and durability of ordinary concrete standard ", during experiment, the contact of sample bottom surface is containing the solution of NaCl, measure the maximum chloride permeability degree of depth, the average chloride permeability degree of depth, and calculate chloride ion transport coefficient.Carrying out in anti-villaumite performance test, when noting riving sample, therefrom rived in the original side of cushion block.
(5) according to cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance judging cushion block without the chloride permeability degree of depth of cushion block anti-villaumite concrete sample and chloride ion transport coefficient, criterion is: when the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample is less than or equal to 1.20 times of the chloride ion transport coefficient without the anti-villaumite concrete sample of cushion block, and the chloride ion transport coefficient of cushion block-anti-villaumite Combined concrete body sample lower than anti-villaumite Concrete Design value time, cushion block meets anti-villaumite performance requirement; When the original side of cushion block to be measured in cushion block-anti-villaumite Combined concrete body sample and the maximum chloride permeability degree of depth of anti-villaumite concrete intersection are greater than 1.50 times of the average chloride permeability degree of depth of whole cushion block-anti-villaumite Combined concrete body sample, then represent cushion block with anti-villaumite concrete in conjunction with bad;
The test result of the present embodiment is: cushion block-anti-villaumite Combined concrete body sample chloride ion transport coefficient is 9.76 × 10
-12m
2/ s, the chloride ion transport coefficient without the anti-villaumite concrete sample of cushion block is 6.21 × 10
-12m
2/ s.The chloride ion transport coefficient of cement based cushion block-anti-villaumite Combined concrete body sample is 1.57 times of contrast sample, is greater than 1.20 times, and is greater than 7.0 × 10
-12m
2the designing requirement of/s, this cushion block can not meet this concrete anti-villaumite performance requirement.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. detect a method for the anti-villaumite performance of reinforced concrete cement based cushion block, it is characterized in that, comprise the following steps:
(1) round the cushion block part as cushion block to be measured or cutting cushion block as cushion block to be measured, cut the cushion block to be measured obtained and have at least surface to be original side; Described original side is the side of uncut cushion block;
(2) cushion block to be measured is placed on the length of side and is more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm, the bottom surface of cushion block to be measured contacts with die trial bottom surface, build the anti-villaumite concrete that thickness is more than or equal to 70mm, obtain cushion block-anti-villaumite Combined concrete body test specimen; Simultaneously preparation size identical with cushion block-anti-villaumite Combined concrete body test specimen without the anti-villaumite concrete sample of cushion block; Anti-villaumite concrete in described cushion block-anti-villaumite Combined concrete body test specimen is with identical with match ratio without the concrete starting material of anti-villaumite in cushion block anti-villaumite concrete sample;
(3) by cushion block-anti-villaumite Combined concrete body test specimen with without after the standard curing to the length of time of cushion block anti-villaumite concrete sample, respectively from cushion block-anti-villaumite Combined concrete body test specimen with upwards intercept without the bottom surface of cushion block anti-villaumite concrete sample and prepare cushion block-anti-villaumite Combined concrete body sample and without the anti-villaumite concrete sample of cushion block;
(4) adopt RCM method or electricity overall approach to cushion block-anti-villaumite Combined concrete body sample and carry out anti-villaumite performance test without cushion block anti-villaumite concrete sample, measure the maximum chloride permeability degree of depth, the average chloride permeability degree of depth, and calculate chloride ion transport coefficient;
(5) according to cushion block-anti-villaumite Combined concrete body sample and the anti-villaumite performance judging cushion block without the chloride permeability degree of depth of cushion block anti-villaumite concrete sample and chloride ion transport coefficient.
2. the method for the anti-villaumite performance of detection reinforced concrete cement based cushion block according to claim 1, it is characterized in that, the cushion block part as cushion block to be measured or cutting cushion block is rounded as cushion block to be measured described in step (1), cutting the cushion block to be measured obtained has at least surface to be original side, is specially:
The height of cushion block to be measured is more than or equal to 35mm, and bottom surface point-to-point transmission ultimate range is less than or equal to 80mm;
When being cushion block to be measured when rounding individual cushion block, when cushion block to be measured is vertically placed, horizontally-projected area is between 1600mm
2~ 3000mm
2between;
When a part for cutting cushion block is as cushion block to be measured, when cushion block to be measured is vertically placed, horizontally-projected area is 2500 ± 500mm
2.
3. the method for the anti-villaumite performance of detection reinforced concrete cement based cushion block according to claim 1; it is characterized in that; step (2) is described to be placed on the length of side and to be more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm by cushion block to be measured, be specially:
Cushion block to be measured is placed on the length of side and is more than or equal to the cube die trial of 100mm or diameter is more than or equal in the middle of the right cylinder die trial of 100mm, and the bottom surface of cushion block to be measured is positioned at the central authorities of die trial bottom surface, contacts with die trial bottom surface.
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| CN113125685B (en) * | 2021-04-09 | 2022-03-04 | 广东电网有限责任公司 | Fabricated concrete under action of chloride environment and design method of bonding interface of fabricated concrete |
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