CN102768167A - Method for testing bulk density and porosity of cement paste and device thereof - Google Patents

Method for testing bulk density and porosity of cement paste and device thereof Download PDF

Info

Publication number
CN102768167A
CN102768167A CN2011101157904A CN201110115790A CN102768167A CN 102768167 A CN102768167 A CN 102768167A CN 2011101157904 A CN2011101157904 A CN 2011101157904A CN 201110115790 A CN201110115790 A CN 201110115790A CN 102768167 A CN102768167 A CN 102768167A
Authority
CN
China
Prior art keywords
cement
cement slurry
graduated cylinder
porosity
bulk density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011101157904A
Other languages
Chinese (zh)
Other versions
CN102768167B (en
Inventor
杨钱荣
杨全兵
朱蓓蓉
张树青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tongji University
Original Assignee
Tongji University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tongji University filed Critical Tongji University
Priority to CN201110115790.4A priority Critical patent/CN102768167B/en
Publication of CN102768167A publication Critical patent/CN102768167A/en
Application granted granted Critical
Publication of CN102768167B publication Critical patent/CN102768167B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Analysing Materials By The Use Of Radiation (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention relates to a method for testing bulk density and porosity of cement paste and a device thereof. The method comprises the following steps of: putting a cement sample into a measuring cylinder, detecting the volume of the cement sample under a vacuum state, adding water drop by drop into the measuring cylinder, measuring the volume of the cement paste and the bulk volume of the cement paste and water after the liquid level is stable, and calculating bulk density and porosity of the cement paste according to the weight of the measuring cylinder, the weight of the measuring cylinder containing the cement sample, the total weight of the measuring cylinder containing both cement and water, the volume of the cement paste and the bulk volume of the cement paste and water. The device comprises a vacuum device, the measuring cylinder and a medical infusion tube. In comparison with the prior art, the method and the device provided by the invention can be effectively used to test bulk density and porosity of cement pastes of different types. By the adoption of the method, ideal compatibility composition of composite cement can be obtained, energy consumption during the cement production process can be reduced, and utilization rate of industrial wastes such as fly ash, slag powder, steel slag powder and the like can be raised.

Description

The method of testing and the device of a kind of cement slurry bulk density and porosity
Technical field
The present invention relates to belong to building material technical field, especially relate to the method for testing and the device of a kind of cement slurry bulk density and porosity.
Background technology
In cement performance; Gain in strength is of paramount importance technical feature; The factor that influences this performance is except that the sulfate optimization of chemical constitution, mineral composition and the cement of cement grog, and the fineness of grog and composite material, granule-morphology, distribution of particles and degree of hydration are major influence factors.For further improving the strength of cement performance, reach the energy-saving and emission-reduction purpose simultaneously, one relatively reality be on the grain composition of adjusting cement clinker and composite material, to work hard with valid approach.
Cement intensity and porosity have confidential relation, and porosity depends on the bulk density of cement granules and the degree of hydration of cement.We can say that on the grain composition of the present cement granules of cement intensity final body and the degree of hydration of cement, and grain composition generally characterizes with bulk density.
The size distribution of cement is to the structure of cement stone; And then it is very big to the performance impact of cement stone; It is determining the bulk density of cement slurry and the growing amount of hydrated cementitious speed and hyrate; Have only bulk density the best, when cement-hydrate can fully be filled the hole of cement slurry simultaneously, just can obtain the most closely knit water mudrock structure when cement slurry.
Cement is a kind of powdered adhesive gel material of continuous size distribution; The discussion of its bulk density must be just meaningful in slurry; And the method for the long-pending density of existing test water dust only is applicable to the qualitative examination of dry powder system; Also have research to calculate the bulk density of cement granules in the slurry through mathematical model, owing to adopt desirable simplified model, result of calculation possibly differ greatly with distribution of particles in the actual cement slurry.Therefore, develop a kind of can be simply, the method for packing density of particle is of far-reaching significance in the test water slurry body effectively.
Summary of the invention
The object of the invention is exactly bulk density and the method for testing and the device of porosity that the complementary Binder Materials complex cement slurry of a kind of skillful material cement slurry that can be used for testing different fineness and admixture different cultivars and consumption is provided in order to overcome the defective that above-mentioned prior art exists.
The object of the invention can be realized through following technical scheme:
The method of testing of a kind of cement slurry bulk density and porosity is characterized in that, this method may further comprise the steps:
In the graduated cylinder of (1) cement sample being packed into, connecting the rubber stopper of vacuum plant then beyond the Great Wall, with the syringe needle break-through rubber stopper of the medical infusion needle tubing that is connecting water bottle.
(2) close the flow control valve of Transfusion needle pipe, open vacuum plant then, vacuumizing 10min in the graduated cylinder and detecting the volume V of cement sample 1
(3) open the flow control valve of Transfusion needle pipe; Water slowly drips in the input tube through the syringe needle on the rubber stopper and infiltrates and obtains cement slurry in the cement sample; The liquid level that adds entry should be higher than the cement slurry end face, closes flow control valve after dripping an amount of water, continues to vacuumize 1h;
(4) close vacuum plant, take off graduated cylinder and cover rubber stopper and be placed on and leave standstill 1h on the horizontal table top, wait liquid level stabilizing after, measure the cumulative volume of cement slurry volume and cement slurry and water;
(5) cumulative volume according to the weight of graduated cylinder, the weight that contains the graduated cylinder of cement sample, the general assembly (TW) that contains the graduated cylinder of cement and water, cement slurry volume, cement slurry and water calculates cement slurry bulk density and porosity.
Described cement sample is portland cement, slag cement, trass cement, pulverized fuel ash cement or composite Portland cement.
Also comprise complementary Binder Materials in the described cement sample, this complementary Binder Materials is flyash, calcareous addition of volcano, slag powders, steel-making slag powder or colliery powder.
The computing method of described cement slurry bulk density are as follows:
ρ 2 = ( m 3 - m 1 ) - ( V 3 - V 2 ) × 1 V 2
Wherein, m 1Be the weight of graduated cylinder, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
The computing method of described cement slurry porosity are as follows:
ϵ = ( m 3 - m 2 ) / 1 - ( V 3 - V 2 ) V 2 × 100
Wherein, m 2Be the weight of the graduated cylinder that contains the cement sample, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
The proving installation of a kind of cement slurry bulk density and porosity; It is characterized in that this device comprises vacuum plant, graduated cylinder and medical infusion lines, described graduated cylinder is provided with rubber stopper; Described vacuum plant is connected with rubber stopper on the graduated cylinder through pipeline; The front end of pipeline is located on the rubber stopper, and described medical infusion lines is provided with flow control valve, and the syringe needle of woven hose front end is located on the rubber stopper.
Compared with prior art; The present invention can be used to test the bulk density and the porosity of different cultivars cement slurry effectively; The compatibility that can obtain comparatively ideal complex cement through this method is formed, and the energy resource consumption in the reduction cement production process also can improve the utilization factor of trade wastes such as flyash, slag powders and steel-making slag powder.
Description of drawings
Fig. 1 is the structural representation of this device.
1 is that vacuum plant, 2 is that graduated cylinder, 3 is that rubber stopper, 4 is medical infusion lines among the figure.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
The proving installation of a kind of cement slurry bulk density and porosity; Its structure is as shown in Figure 1, and this device comprises vacuum plant 1, graduated cylinder 2 and medical infusion lines 4, and graduated cylinder 2 is provided with rubber stopper 3; Vacuum plant 1 is connected with rubber stopper 3 on the graduated cylinder 2 through pipeline; The front end of pipeline is located on the rubber stopper 3, and medical infusion lines 4 is provided with flow control valve, and the syringe needle of woven hose front end is located on the rubber stopper.Use this device that cement slurry bulk density and porosity are tested, this method may further comprise the steps:
In the graduated cylinder of (1) cement sample being packed into, connecting the rubber stopper of vacuum plant then beyond the Great Wall, with the syringe needle break-through rubber stopper 3 of the medical infusion needle tubing 4 that is connecting water bottle;
(2) close the flow control valve of Transfusion needle pipe, open vacuum plant 1 then, vacuumizing 10min in the graduated cylinder 2 and detecting the volume of cement sample;
(3) open the flow control valve of Transfusion needle pipe 4, water slowly drips in the input tube 2 and infiltrates through the syringe needle on the rubber stopper and obtains cement slurry in the cement sample, closes flow control valve after dripping an amount of water, continues to vacuumize 1h;
(4) close vacuum plant 1, take off graduated cylinder and cover rubber stopper and be placed on and leave standstill 1h on the horizontal table top, wait liquid level stabilizing after, measure the cumulative volume of cement slurry volume and cement slurry and water;
(5) cumulative volume according to the weight of graduated cylinder, the weight that contains the graduated cylinder of cement sample, the general assembly (TW) that contains the graduated cylinder of cement and water, cement slurry volume, cement slurry and water calculates cement slurry bulk density and porosity.
The cement sample that adopts is portland cement, slag cement, trass cement, pulverized fuel ash cement or composite Portland cement, can also adopt flyash, calcareous addition of volcano, slag powders, steel-making slag powder or colliery powder as complementary Binder Materials in this cement sample.
The computing method of cement slurry bulk density are as follows:
ρ 2 = ( m 3 - m 1 ) - ( V 3 - V 2 ) × 1 V 2
Wherein, m 1Be the weight of graduated cylinder, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
The computing method of cement slurry porosity are as follows:
ϵ = ( m 3 - m 2 ) / 1 - ( V 3 - V 2 ) V 2 × 100
Wherein, m 2Be the weight of the graduated cylinder that contains the cement sample, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
Bulk density and porosity data that different cultivars complex cement and slurry adopt this method test have been listed in the table 1.Wherein No. 1 sample is that specific surface area is 350m 2The skillful material cement of/kg, 2～No. 4 sample adopts 10%～30% II level flyash (F) equivalent substitution cement clinker respectively; It is 400m that 5～No. 7 samples adopt 10%～30% specific surface area respectively 2/ kg steel-making slag powder (S) equivalent substitution cement clinker; It is slag powders (K) the equivalent substitution cement clinker of S95 that 8～No. 10 samples adopt 40%～60% rank respectively.
Table 1 different cultivars complex cement bulk density and porosity test result
Figure BDA0000059371320000043
Figure BDA0000059371320000051
From table 1, can find out; The bulk density and the porosity that can be used to test the different cultivars cement slurry effectively of the present invention; The compatibility that can obtain comparatively ideal complex cement through this method is formed, and the energy resource consumption in the reduction cement production process also can improve the utilization factor of trade wastes such as flyash, slag powders and steel-making slag powder.

Claims (6)

1. the method for testing of cement slurry bulk density and porosity is characterized in that this method may further comprise the steps:
In the graduated cylinder of (1) cement sample being packed into, connecting the rubber stopper of vacuum plant then beyond the Great Wall, with the syringe needle break-through rubber stopper of the medical infusion needle tubing that is connecting water bottle;
(2) close the flow control valve of Transfusion needle pipe, open vacuum plant then, vacuumizing 10min in the graduated cylinder and detecting the volume of cement sample;
(3) open the flow control valve of Transfusion needle pipe, water slowly drips in the input tube and infiltrates through the syringe needle on the rubber stopper and obtains cement slurry in the cement sample, and the liquid level that adds entry should be higher than the cement slurry end face, closes flow control valve then, continues to vacuumize 1h;
(4) close vacuum plant, take off graduated cylinder and cover rubber stopper and be placed on and leave standstill 1h on the horizontal table top, wait liquid level stabilizing after, measure the cumulative volume of cement slurry volume and cement slurry and water;
(5) cumulative volume according to the weight of graduated cylinder, the weight that contains the graduated cylinder of cement sample, the general assembly (TW) that contains the graduated cylinder of cement and water, cement slurry volume, cement slurry and water calculates cement slurry bulk density and porosity.
2. the method for testing of a kind of cement slurry bulk density according to claim 1 and porosity is characterized in that described cement sample is portland cement, slag cement, trass cement, pulverized fuel ash cement or composite Portland cement.
3. the method for testing of a kind of cement slurry bulk density according to claim 2 and porosity; It is characterized in that; Also comprise complementary Binder Materials in the described cement sample, this complementary Binder Materials is flyash, calcareous addition of volcano, slag powders, steel-making slag powder or colliery powder.
4. the method for testing of a kind of cement slurry bulk density according to claim 1 and porosity is characterized in that the computing method of described cement slurry bulk density are as follows:
ρ 2 = ( m 3 - m 1 ) - ( V 3 - V 2 ) × 1 V 2
Wherein, m 1Be the weight of graduated cylinder, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
5. the method for testing of a kind of cement slurry bulk density according to claim 1 and porosity is characterized in that the computing method of described cement slurry porosity are as follows:
ϵ = ( m 3 - m 2 ) / 1 - ( V 3 - V 2 ) V 2 × 100
Wherein, m 2Be the weight of the graduated cylinder that contains the cement sample, m 3Be the general assembly (TW) of the graduated cylinder that contains cement and water, V 2Be cement slurry volume, V 3Cumulative volume for cement slurry and water.
6. device of implementing the method for testing of cement slurry bulk density as claimed in claim 1 and porosity; It is characterized in that this device comprises vacuum plant, graduated cylinder and medical infusion lines, described graduated cylinder is provided with rubber stopper; Described vacuum plant is connected with rubber stopper on the graduated cylinder through pipeline; The front end of pipeline is located on the rubber stopper, and described medical infusion lines is provided with flow control valve, and the syringe needle of woven hose front end is located on the rubber stopper.
CN201110115790.4A 2011-05-05 2011-05-05 Method for testing bulk density and porosity of cement paste and device thereof Expired - Fee Related CN102768167B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110115790.4A CN102768167B (en) 2011-05-05 2011-05-05 Method for testing bulk density and porosity of cement paste and device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110115790.4A CN102768167B (en) 2011-05-05 2011-05-05 Method for testing bulk density and porosity of cement paste and device thereof

Publications (2)

Publication Number Publication Date
CN102768167A true CN102768167A (en) 2012-11-07
CN102768167B CN102768167B (en) 2014-08-13

Family

ID=47095648

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110115790.4A Expired - Fee Related CN102768167B (en) 2011-05-05 2011-05-05 Method for testing bulk density and porosity of cement paste and device thereof

Country Status (1)

Country Link
CN (1) CN102768167B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104297097A (en) * 2014-10-20 2015-01-21 上海利物宝建筑科技有限公司 Testing method for cohesion performance of 3D printing building mortar
CN104374681A (en) * 2014-11-11 2015-02-25 首钢总公司 Method for measuring coke parameter
CN105445145A (en) * 2015-11-13 2016-03-30 中国石油天然气股份有限公司 Method for measuring density of low-temperature high-viscosity fluid
CN106018240A (en) * 2016-06-27 2016-10-12 新疆大学 Device for testing random stacking catalytic bed porosity distribution
CN106442259A (en) * 2016-09-22 2017-02-22 中南林业科技大学 Method and device for rapidly determining effective porosity of ecological porous concrete
CN106596316A (en) * 2016-12-26 2017-04-26 深圳大学 Device and method for testing area of cross section of rusted reinforcing steel bar
CN106769649A (en) * 2016-12-14 2017-05-31 河南理工大学 A kind of assay method of wet type prose style free from parallelism bulk density and void ratio
CN107526925A (en) * 2017-08-09 2017-12-29 中国石油天然气集团公司 Determine the method and device of cementing cement system deposition rate
CN107607426A (en) * 2017-08-07 2018-01-19 中国石油天然气集团公司 The deposition rate and voidage assay method of a kind of cementing concrete mixture system
CN108387482A (en) * 2018-04-27 2018-08-10 新疆维吾尔自治区产品质量监督检验研究院 A kind of cementitious material slurry apparent density device for quick testing
CN109030310A (en) * 2018-07-10 2018-12-18 华侨大学 A kind of device of determining accumulation bulk granular material voidage
CN109470620A (en) * 2018-12-10 2019-03-15 同济大学 Method based on non-evaporable water assay hydrated cement paste blind hole porosity
CN110967278A (en) * 2019-11-25 2020-04-07 浙江中信检测有限公司 Compactness detection system for engineering detection and detection method thereof
CN111024583A (en) * 2019-12-30 2020-04-17 湘潭大学 Simple method for testing porosity of porous material
CN112147054A (en) * 2020-09-25 2020-12-29 青岛路桥建设集团有限公司 Rapid test method for matrix communication porosity of semi-flexible pavement
CN112798463A (en) * 2021-02-24 2021-05-14 中铁六局集团有限公司 Test method for determining solid density of slurry
CN112881265A (en) * 2021-03-01 2021-06-01 西南石油大学 Quantitative in-situ evaluation method for pore connectivity in well cementation cement slurry solidification process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1370665A (en) * 2001-02-23 2002-09-25 兴圣机械股份有限公司 Vacuum penetrating and curing formation machine
US20020162383A1 (en) * 2000-05-30 2002-11-07 Ali Regimand Systems and methods for determining the porosity and/or effective air void content of compacted material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020162383A1 (en) * 2000-05-30 2002-11-07 Ali Regimand Systems and methods for determining the porosity and/or effective air void content of compacted material
CN1370665A (en) * 2001-02-23 2002-09-25 兴圣机械股份有限公司 Vacuum penetrating and curing formation machine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DONG ZHANG ET AL.: "development of thermal energy storage concrete", 《CEMENT AND CONCRETE RESEARCH》, vol. 34, no. 6, 30 June 2004 (2004-06-30) *
张扬波，胡以强: "摩擦材料孔隙率测量方法研究", 《非金属矿》, vol. 26, no. 3, 31 May 2003 (2003-05-31) *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104297097A (en) * 2014-10-20 2015-01-21 上海利物宝建筑科技有限公司 Testing method for cohesion performance of 3D printing building mortar
CN104374681A (en) * 2014-11-11 2015-02-25 首钢总公司 Method for measuring coke parameter
CN105445145A (en) * 2015-11-13 2016-03-30 中国石油天然气股份有限公司 Method for measuring density of low-temperature high-viscosity fluid
CN106018240A (en) * 2016-06-27 2016-10-12 新疆大学 Device for testing random stacking catalytic bed porosity distribution
CN106018240B (en) * 2016-06-27 2019-01-04 新疆大学 Random accumulation catalytic bed porosity profile test device
CN106442259A (en) * 2016-09-22 2017-02-22 中南林业科技大学 Method and device for rapidly determining effective porosity of ecological porous concrete
CN106769649A (en) * 2016-12-14 2017-05-31 河南理工大学 A kind of assay method of wet type prose style free from parallelism bulk density and void ratio
CN106596316B (en) * 2016-12-26 2024-03-22 深圳大学 Testing device and method for cross-sectional area of rusted steel bar
CN106596316A (en) * 2016-12-26 2017-04-26 深圳大学 Device and method for testing area of cross section of rusted reinforcing steel bar
CN107607426A (en) * 2017-08-07 2018-01-19 中国石油天然气集团公司 The deposition rate and voidage assay method of a kind of cementing concrete mixture system
CN107526925A (en) * 2017-08-09 2017-12-29 中国石油天然气集团公司 Determine the method and device of cementing cement system deposition rate
CN108387482A (en) * 2018-04-27 2018-08-10 新疆维吾尔自治区产品质量监督检验研究院 A kind of cementitious material slurry apparent density device for quick testing
CN109030310A (en) * 2018-07-10 2018-12-18 华侨大学 A kind of device of determining accumulation bulk granular material voidage
CN109470620A (en) * 2018-12-10 2019-03-15 同济大学 Method based on non-evaporable water assay hydrated cement paste blind hole porosity
CN110967278A (en) * 2019-11-25 2020-04-07 浙江中信检测有限公司 Compactness detection system for engineering detection and detection method thereof
CN110967278B (en) * 2019-11-25 2022-04-05 浙江中信检测有限公司 Compactness detection system for engineering detection and detection method thereof
CN111024583A (en) * 2019-12-30 2020-04-17 湘潭大学 Simple method for testing porosity of porous material
CN112147054A (en) * 2020-09-25 2020-12-29 青岛路桥建设集团有限公司 Rapid test method for matrix communication porosity of semi-flexible pavement
CN112147054B (en) * 2020-09-25 2023-02-28 青岛路桥建设集团有限公司 Rapid test method for matrix communication porosity of semi-flexible pavement
CN112798463A (en) * 2021-02-24 2021-05-14 中铁六局集团有限公司 Test method for determining solid density of slurry
CN112881265A (en) * 2021-03-01 2021-06-01 西南石油大学 Quantitative in-situ evaluation method for pore connectivity in well cementation cement slurry solidification process
CN112881265B (en) * 2021-03-01 2022-04-12 西南石油大学 Quantitative in-situ evaluation method for pore connectivity in well cementation cement slurry solidification process

Also Published As

Publication number Publication date
CN102768167B (en) 2014-08-13

Similar Documents

Publication Publication Date Title
CN102768167B (en) Method for testing bulk density and porosity of cement paste and device thereof
Ercikdi et al. Strength and ultrasonic properties of cemented paste backfill
Haiqiang et al. Yield stress of cemented paste backfill in sub-zero environments: experimental results
Alderete et al. Pore structure description of mortars containing ground granulated blast-furnace slag by mercury intrusion porosimetry and dynamic vapour sorption
Panchal et al. Mill tailings based composites as paste backfill in mines of U-bearing dolomitic limestone ore
CN105859229B (en) A kind of slag make binder materials and fine aggregate without cement green mortar and preparation method thereof
CN101871876B (en) Visible multifunctional fracture seepage simulation test bench
CN106053183B (en) Dock the foam concrete sample preparation facilities and method of indoor rock-soil mechanics testing machine
CN104692720B (en) A kind of copper tailing is non-burning brick and preparation method thereof
Biçer-Simsir et al. Evaluation of lime-based hydraulic injection grouts for the conservation of architectural surfaces
CN103470303A (en) Mine filling system and filling method thereof
CN109975183A (en) A kind of soil pollutant migration rate calculation method
CN107449895B (en) Method for measuring dosage of cement and lime in cement lime stabilized soil sample
CN103964798B (en) Aeolian sand Paste-like body coal mine filling material
CN201697858U (en) Visual multifunctional fracture seepage simulation experimental bench
CN203465175U (en) Gelatinized cement paste permeability tester
CN109989786B (en) Method for establishing model for predicting yield stress of waste rock-tailing high-concentration filling slurry and application
CN202583178U (en) Experimental device for measuring soil mineralization potential in large batches
CN103926111B (en) Stratified pumping device
CN207571105U (en) A kind of blocking agent linear expansion rate test device
CN104020094B (en) Geotechnique's high pressure permeability instrument
CN103076433B (en) Experimental device for testing foaming sol adsorbing dusts
CN113866065A (en) Deep mine gas-water mixed penetration test system and test method thereof
CN104895525A (en) Gas drive type grouting method
CN202041529U (en) Detection device for early autogenous shrinkage of cement mortar

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140813

Termination date: 20180505