CN108827827B - 3D printing concrete constructability testing device and method - Google Patents
3D printing concrete constructability testing device and method Download PDFInfo
- Publication number
- CN108827827B CN108827827B CN201810855948.3A CN201810855948A CN108827827B CN 108827827 B CN108827827 B CN 108827827B CN 201810855948 A CN201810855948 A CN 201810855948A CN 108827827 B CN108827827 B CN 108827827B
- Authority
- CN
- China
- Prior art keywords
- laser displacement
- constructability
- load container
- concrete
- load
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention provides a 3D printing concrete constructability testing device and a method, wherein the device comprises a bracket, a load container, a molding die and a laser displacement detector; the upper part of the bracket is provided with a supporting sleeve, the bottom of the bracket is provided with a bottom plate, and the supporting sleeve is fixedly connected with the bottom plate through a supporting rod; the upper part of the load container is opened, the bottom of the load container is closed, and the load container is arranged in the supporting sleeve in a penetrating way; the molding die is used for manufacturing a mortar model to be tested; the laser displacement detector comprises two laser displacement sensors and a display screen, wherein the longitudinal laser sensor is fixedly installed on the side wall of the load container, the transverse laser sensor is arranged on the bottom plate through a movable fixing device, and the display screen is connected with the two laser displacement sensors through a wire. The invention can completely simulate the printing condition in the actual process, reduce the deformation in the printing process in an ultrahigh way, and visually see the vertical deformation curve in the loading process; by simulating the printing time intervals among different layers, the influence of the printing time intervals among the layers on the constructability can be researched, and a reference is provided for determining the vertical printing speed.
Description
Technical Field
The invention belongs to the field of concrete performance testing, and particularly relates to a 3D printing concrete constructability testing device and method.
Background
The existing literature defines printability in 3D printed concrete as the ability of cement-based materials to pass smoothly through a 3D printing system. Printability is not only a simple property of a material, it is related to the extrudability, constructability and interlayer bond strength of the material.
Extrudability: the freshly mixed cement-based material smoothly passes through the extrusion port in a pumping or spiral extrusion mode, extruded strip concrete is uniform and continuous, and the condition of tearing or breaking is avoided.
Constructability: after the freshly mixed cement-based material is extruded and molded, the shape of the material can be maintained after the material bears the dead weight and the pressure of the upper covering layer.
Interlayer bonding strength: the ability to bond the layers together after printing.
3D printing speed is closely related with the constructability, and the fast printing speed of high constructability adaptation is favorable to accelerating construction speed, realizes printing the high turnover of component. At present, equipment for accurately testing the constructability of materials is lacked at home and abroad, only a simple evaluation method is provided for the deformation of the materials, the deformation of the materials is difficult to compare with the deformation in the printing process, the deformation value in the printing process cannot be simulated, accidental errors are large in the operation process, and the measured index volatility is high.
Therefore, the 3D printing process of the concrete cannot be simulated in the prior art, the denaturation value of the concrete in the printing process cannot be simulated, accidental errors are large in the operation process, the measured index volatility is large, and the constructability of the 3D printed concrete cannot be accurately tested.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a 3D printing concrete constructability testing device and an application method thereof, so that the technical problems are solved.
The technical scheme for achieving the purpose is as follows:
A3D printing concrete constructability testing device comprises a support, a load container, a molding die and a laser displacement detector, wherein a support sleeve is arranged at the upper part of the support, a bottom plate is arranged at the bottom of the support, and the support sleeve is fixedly connected with the bottom plate through a support rod; the upper part of the load container is open, the bottom of the load container is closed, and the load container is arranged in the support sleeve in a penetrating way; the molding die is used for manufacturing a model to be tested; the laser displacement detector comprises two laser displacement sensors and a display screen, the longitudinal laser sensor is fixedly arranged on the side wall of the load container, the transverse laser sensor is arranged on the bottom plate through a movable fixing device, and the display screen is connected with the two laser displacement sensors through a lead;
the method for testing the vertical and horizontal deformation values of the 3D printed concrete by using the 3D printed concrete constructability testing device comprises the following specific steps:
(1) taking out the molding die to manufacture a mortar model, aligning and placing the mortar model below the material pipe, adjusting the position of the laser sensor, and ensuring that the laser of the longitudinal sensor is vertically downward and the laser of the transverse sensor is horizontal, is positioned at the high position of the mortar model 1/2 and is intersected with the central line of the mortar model;
(2) load was added for the first time and measured: turning on the laser displacement detector, and setting the loading weight M at each timeXLoading interval time T, number of times of loading M, weighing (M)X-weight of plastic tube) is added into the plastic tube at a constant speed, and the reading of the laser displacement detector is read and recorded;
(3) second loading and measurement: according to step (2), M is weighedXAdding a plastic pipe for weight load;
(4) repeating the step (3) until the loading times reach M times, and reading and recording the readings of the laser displacement detector;
the invention has the beneficial effects that: the 3D printing concrete constructability testing device and the application thereof fill up the technical blank of testing the 3D printing concrete constructability in the prior art, can quickly adjust the single loading weight and the loading interval time according to different printing conditions, greatly simulate the load change condition in the printing process and the change of the printing speed, and accurately measure the transverse and longitudinal deformation of the model by using the laser displacement sensor. The device has the characteristics of convenience, rapidness, high efficiency, accuracy and the like, provides a test method which is really feasible for researching the constructability of the material for researchers, avoids the blindness of the site printing test constructability, and saves the manpower, the material resources and the financial resources.
Drawings
FIG. 1 is a schematic overall structure diagram of one embodiment of a 3D printed concrete constructability testing device according to the invention;
FIG. 2 is a schematic structural view of a stent according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of concrete tested by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a 3D printing concrete constructability testing device is characterized by comprising a bracket (2), a load container (1), a molding die (4) and a laser displacement detector; as shown in fig. 2, the upper part of the bracket (2) is provided with a support sleeve (7), the bottom part is provided with a bottom plate (9), and the support sleeve (7) is fixedly connected with the bottom plate (9) through a support rod (8); the upper part of the load container (1) is open, the bottom of the load container is closed, the load container is used for containing a load, and the load container (1) is arranged in the support sleeve (7) in a penetrating mode; the molding die (4) is used for manufacturing a mortar model to be tested; the laser displacement detector comprises two laser displacement sensors and a display screen (5), wherein the longitudinal laser sensor is fixedly installed on the side wall of the load container (1), the transverse laser sensor is arranged on the bottom plate (9) through a movable fixing device (11), and the display screen (5) is connected with the two laser displacement sensors through a wire.
Further, when the load container (1) passes through the supporting sleeve (7), the distance between the outer wall of the load container (1) and the inner wall of the supporting sleeve (7) is equal everywhere, and the upper surface of a mortar model made by the molding die (4) is matched with the lower surface of the load container (1).
As an embodiment of the present invention, specifically, the support sleeve (7) is a hollow cylinder, the bottom plate (9) is a circular disc, the diameter of the bottom plate (9) is 3 times of the diameter of the support sleeve (7), the center line of the support sleeve (7) and the center line of the bottom plate (9) are on the same straight line, the bottom surface of the support sleeve (7) is parallel to the surface of the bottom plate (9), 3 support rods (8) are provided, the upper end of each support rod (8) is welded and fixed to the side wall of the support sleeve (7) close to the bottom surface, and the lower end of each support rod is welded and fixed to the periphery of the chassis (9). The load container (1) is made of a plastic pipe, the upper part of the load container (1) is open, and the lower part of the load container is closed; the outer diameter of the load container (1) is 1-2mm smaller than the inner diameter of the support sleeve (7); the cavity of the molding die (4) is cylindrical, and the inner diameter of the cavity is equal to the outer diameter of the load container (1).
As an embodiment of the invention, further, the load container (1) is made of a plastic tube, the upper part is open, the lower part is closed, the outer diameter is 50mm, the wall thickness is 1.5mm, the length is 1000mm, and the weight is 30 g; the support is made of stainless steel, wherein the support sleeve (7) is a hollow cylinder with an inner diameter of 52mm and a height of 60 mm; the chassis (9) is a disc with the diameter of 150mm and the thickness of 5mm, and the distance between the bottom surface of the support sleeve (7) and the surface of the bottom plate (9) is 300 mm; the molding die (4) is made of stainless steel, a cavity of the molding die is a cylinder with the diameter of 50mm and the height of 50mm, and an opening at the upper end of the molding die is used for adding mortar; the molding die (4) is detachably arranged on the bracket (2).
As an embodiment of the invention, further, the laser displacement detector comprises a longitudinal laser displacement sensor (3), a transverse laser displacement sensor (6) and a display screen (5), wherein the longitudinal laser displacement sensor (3) is fixedly connected to the side wall of the load container (1), the fixed connection can adopt welding, screw connection and other modes, and laser emitted by the longitudinal laser displacement sensor (3) is downward vertically to ensure the accuracy of the measured distance; the transverse laser displacement sensor (6) is arranged on the bottom (9) through a movable fixing device (11), the movable fixing device can adjust the vertical height of the sensor relative to the bottom plate (9) and the horizontal direction of laser, the height of the laser is ensured to be located at the 1/2 height of the mortar model (10), the laser is kept horizontal and is intersected with the straight line where the center line of the mortar model (10) is located, and the transverse maximum deformation value can be measured; the movable fixing device can be a telescopic rod with the height capable of being adjusted at will and the upper part capable of rotating, the bottom of the telescopic rod is fixed on the bottom plate, then the transverse laser displacement sensor is fixed on the upper part of the telescopic rod, and the transverse laser displacement sensor is enabled to emit laser to be kept horizontal and to be intersected with a straight line where a center line of the mortar model (10) is located; the two laser displacement sensors are respectively connected with the display screen (5) through wires, so that the display screen (5) can display distance information measured by the sensors.
The steps of testing the 3D printing concrete constructability by utilizing the device are as follows:
the printing parameters in this embodiment are: the load is water, the water adding interval time is 80s, the water adding times are 18 times, and the single water adding amount is determined according to the calculated difference in the steps.
(1) Preparing mortar: the test material is prepared by adopting a cement mortar stirrer, and the stirring procedure comprises the following steps: determining the amounts of all components of the test material; the second step is that: adding all the powder into a stirrer, and slowly stirring for 60 s; the third step: adding clear water at a constant speed (within 30 s), and stirring at a slow speed while adding water; the fourth step: stopping stirring for 30s, and manually scraping the dry powder on the wall of the pot; the fifth step: quickly stirring for 60s, and taking out for later use;
(2) molding a test block, and the first step: taking out the molding die (4), coating a layer of release agent on the inner surface of the molding die (4), and weighing the total mass M of the molding die (4) and the release agent1(ii) a The second step is that: adding mortar with a volume half that of the mold into the molding mold (4), and placing the mortar on a diving table to vibrate for 5 times; the third step: adding mortar with half volume of the mold into the molding mold (4), placing the molding mold on a diving table for vibration for 5 times, and adding the mortar continuously during the vibration process to ensure that the upper surface of the mold is horizontal; the fourth step: weighing the total mass M of the molding die (4) and the mortar2(ii) a The fifth step: removing the mould, taking out the mortar model (10), and placing the mortar model (10) at the center of the bottom plate (9);
(3) adjusting the mortar model (10) to be aligned with the load container (1), placing the load container (1) on the mortar model (10), and adjusting the position of the laser displacement sensor to ensure that the laser of the longitudinal displacement sensor (3) is vertically downward and the laser of the transverse displacement sensor (6) is horizontal, is located at 1/2 high of the mortar model (10) and is intersected with the center line of the mortar model, as shown in fig. 3;
(4) load was added for the first time and measured: turning on the laser displacement detector, and setting the loading weight M at each timeXLoading interval time 80s, loading times 18;
(5) weighing (M)X-30) g of water is added into a plastic tube at a constant speed, and the reading of a laser displacement detector is read and recorded;
(6) second loading and measurement: according to step (5), M is weighedXAdding plastic into water;
(7) and (5) repeating the operation step (6) until the loading times reach 18 times, and reading and recording the reading of the laser displacement detector.
Table 1 shows the flow parameters of the fresh concrete and the 3D printed concrete of the 6 different thixotropic formulations tested in this example.
Table 1: 6 formula and flow parameters of different 3D printed concrete
Table 2 lists measured lateral and vertical deformation values for 3D printed concrete of 6 different thixotropic formulations printed at 20 cm height.
Table 2: 6 test data of 3D printed concrete with different thixotropy formulas
For 3D printing concrete with 6 different thixotropy formulas, the loading times, the single loading weight and the loading time interval are set by the device to simulate the real 3D printing process, and the transverse deformation and the longitudinal deformation of the concrete model can be measured. As can be seen from table 2, in this example, after the first 4 kinds of concrete are printed, the transverse deformation rate is below 2.1%, the longitudinal deformation rate is below 0.35%, and the transverse deformation rate of the second two kinds of concrete exceeds 2.5%, wherein the transverse deformation rate of the 5 th concrete reaches 2.72%, the longitudinal deformation rate of the second two kinds of concrete exceeds 0.4%, and the longitudinal deformation rate of the 6 th concrete reaches 0.60%, it can be concluded that in this example, the concrete of the first four kinds of formulations has better constructability, and the concrete of the second two kinds of formulations has poorer constructability. Therefore, the device can test the constructability (transverse deformation rate and longitudinal deformation rate) of different 3D printed concretes quickly, efficiently and accurately.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A3D printed concrete constructability test method is characterized in that a 3D printed concrete constructability test device is used for testing vertical and horizontal deformation values of 3D printed concrete, wherein the 3D printed concrete constructability test device comprises a support, a load container, a molding die and a laser displacement detector; the upper part of the bracket is provided with a support sleeve, the bottom of the bracket is provided with a bottom plate, and the support sleeve is fixedly connected with the bottom plate through a support rod; the upper part of the load container is open, the bottom of the load container is closed, and the load container is arranged in the support sleeve in a penetrating way; the molding die is used for manufacturing a mortar model to be tested; the laser displacement detector comprises two laser displacement sensors and a display screen, wherein the longitudinal laser displacement sensor is fixedly arranged on the side wall of the load container, the transverse laser displacement sensor is arranged on the bottom plate through a movable fixing device, and the display screen is connected with the two laser displacement sensors through a lead;
the specific steps for testing the vertical and horizontal deformation values of the 3D printed concrete are as follows:
(1) taking out the molding die to manufacture a mortar model, placing the mortar model on the bottom plate of the bracket and aligning with the load container, adjusting the position of the laser displacement sensor, and ensuring that the laser of the longitudinal sensor is vertically downward and the laser of the transverse sensor is horizontal, is positioned at the high position of the mortar model 1/2 and is intersected with the central line of the mortar model;
(2) load was added for the first time and measured: turning on the laser displacement detector, and setting the loading weight M at each timeXLoading interval time T, loading times M, weighing A g load, A = MXThe weight of the load container is added into the load container at a constant speed, and the reading of the laser displacement detector is read and recorded;
(3) second loading and measurement: according to step (2), M is weighedXAdding the load of the weight into a load container;
(4) and (5) repeating the operation step (3) until the loading times reach M times, and reading and recording the readings of the laser displacement detector.
2. The 3D printed concrete constructability test method according to claim 1, wherein when the load container passes through the support sleeve, the distance between the outer wall of the load container and the inner wall of the support sleeve is equal everywhere, and the upper surface of the mortar model made by the molding die and the lower surface of the load container are engaged with each other.
3. The 3D printed concrete constructability test method according to claim 2, wherein the support sleeve is a hollow cylinder, the bottom plate is a circular disc, and the diameter of the circular disc is 3 times the diameter of the hollow cylinder.
4. The 3D printed concrete constructability test method according to claim 3, wherein the center line of the hollow cylinder and the center line of the disc are collinear, the bottom surface of the hollow cylinder is parallel to the surface of the disc, and 3 support rods are provided.
5. The 3D printed concrete constructability test method according to claim 3, wherein the load container is made of a plastic tube, which is open at an upper portion and closed at a lower portion.
6. The 3D printed concrete constructability test method according to claim 5, wherein the outer diameter of the plastic pipe is 1-2mm smaller than the inner diameter of the hollow cylinder.
7. The 3D printed concrete constructability test method according to claim 5, wherein the molding die is cylindrical with an inner diameter equal to an outer diameter of the plastic pipe.
8. The 3D printing concrete constructability test method according to claim 1, wherein two laser displacement sensors are respectively used for measuring the transverse deformation and the longitudinal deformation of the mortar model, and the display screen is used for displaying the distance measured by the two laser displacement sensors.
9. The 3D printing concrete constructability test method according to claim 1, wherein the load is water, and the weight of each water addition can be adjusted according to the printing thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855948.3A CN108827827B (en) | 2018-07-31 | 2018-07-31 | 3D printing concrete constructability testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855948.3A CN108827827B (en) | 2018-07-31 | 2018-07-31 | 3D printing concrete constructability testing device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108827827A CN108827827A (en) | 2018-11-16 |
| CN108827827B true CN108827827B (en) | 2020-10-30 |
Family
ID=64152291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810855948.3A Active CN108827827B (en) | 2018-07-31 | 2018-07-31 | 3D printing concrete constructability testing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108827827B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243678B (en) * | 2019-05-24 | 2020-06-26 | 同济大学 | 3D printing building mortar construction performance evaluation device and method |
| JP2021006767A (en) * | 2019-06-28 | 2021-01-21 | 前田建設工業株式会社 | Self-standability evaluation device and evaluation method of cement-based material |
| CN114136840A (en) * | 2021-12-09 | 2022-03-04 | 中国建筑材料科学研究总院有限公司 | 3D printing concrete constructability detection device and method |
| CN114895005A (en) * | 2022-04-22 | 2022-08-12 | 河南城建学院 | 3D printed concrete constructability test method |
| CN114895006B (en) * | 2022-04-22 | 2024-03-19 | 郑州大学 | Test method for testing 3D printed concrete constructability |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636395A (en) * | 2012-05-18 | 2012-08-15 | 哈尔滨工业大学 | Testing device for plastic strength of slip form concrete |
| CN104034595A (en) * | 2014-05-28 | 2014-09-10 | 中国建筑股份有限公司 | Measurement device and measurement method for fresh mortar non-lateral-confinement bearing capacity |
| CN104297103A (en) * | 2014-10-20 | 2015-01-21 | 上海利物宝建筑科技有限公司 | 3D print building mortar workability testing device and application |
| CN105699148A (en) * | 2016-04-05 | 2016-06-22 | 中国矿业大学(北京) | 3D printing equipment and method of strata control simulation experiment similar material |
| CN105928795A (en) * | 2016-06-15 | 2016-09-07 | 黑龙江科技大学 | Method and device for measuring pressure resistance and compression modulus of discrete materials |
| CN106568926A (en) * | 2016-10-31 | 2017-04-19 | 同济大学 | 3D printed building mortar bulk property testing device |
| CN106645661A (en) * | 2016-12-27 | 2017-05-10 | 中建商品混凝土有限公司 | Testing device and testing method of building performance of 3D print material of building |
| KR20180047541A (en) * | 2016-10-31 | 2018-05-10 | (주)제이스코리아 | The Apparatus and Test Method for slump of Freshly Mixed Concrete |
| CN108303524A (en) * | 2018-03-23 | 2018-07-20 | 同济大学 | A kind of test method of underwater 3D printing building mortar performance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10184928B2 (en) * | 2014-01-29 | 2019-01-22 | Quipip, Llc | Measuring device, systems, and methods for obtaining data relating to condition and performance of concrete mixtures |
-
2018
- 2018-07-31 CN CN201810855948.3A patent/CN108827827B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636395A (en) * | 2012-05-18 | 2012-08-15 | 哈尔滨工业大学 | Testing device for plastic strength of slip form concrete |
| CN104034595A (en) * | 2014-05-28 | 2014-09-10 | 中国建筑股份有限公司 | Measurement device and measurement method for fresh mortar non-lateral-confinement bearing capacity |
| CN104297103A (en) * | 2014-10-20 | 2015-01-21 | 上海利物宝建筑科技有限公司 | 3D print building mortar workability testing device and application |
| CN105699148A (en) * | 2016-04-05 | 2016-06-22 | 中国矿业大学(北京) | 3D printing equipment and method of strata control simulation experiment similar material |
| CN105928795A (en) * | 2016-06-15 | 2016-09-07 | 黑龙江科技大学 | Method and device for measuring pressure resistance and compression modulus of discrete materials |
| CN106568926A (en) * | 2016-10-31 | 2017-04-19 | 同济大学 | 3D printed building mortar bulk property testing device |
| KR20180047541A (en) * | 2016-10-31 | 2018-05-10 | (주)제이스코리아 | The Apparatus and Test Method for slump of Freshly Mixed Concrete |
| CN106645661A (en) * | 2016-12-27 | 2017-05-10 | 中建商品混凝土有限公司 | Testing device and testing method of building performance of 3D print material of building |
| CN108303524A (en) * | 2018-03-23 | 2018-07-20 | 同济大学 | A kind of test method of underwater 3D printing building mortar performance |
Non-Patent Citations (3)
| Title |
|---|
| "On the measurement of evolution of structural build-up of cement paste with time by static yield stress test vs. small amplitude oscillatory shear test";QiangYuan 等;《Cement and Concrete Research》;20170930;第99卷;全文 * |
| "Printable properties of cementitious material containing copper tailings for extrusion based 3D printing";Guowei Ma 等;《Construction and Building Materials》;20171215;第3.3.2、4.3节，附图6 * |
| "一种基于挤出固化的建筑3D打印装置设计及验证";车海潮;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20170615;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108827827A (en) | 2018-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108827827B (en) | 3D printing concrete constructability testing device and method | |
| Alderete et al. | Physical evidence of swelling as the cause of anomalous capillary water uptake by cementitious materials | |
| CN204855317U (en) | Device is jointly surveyd with lixiviation hog factor to coarse grain soil sample osmotic coefficient | |
| CN106645661B (en) | A kind of building 3D printing material builds the test device and test method of performance | |
| CN202075196U (en) | Stacking density tester | |
| CN103604409B (en) | Newly-poured concrete floor slab overall shrinkage constraint deformation measuring method | |
| CN103675244A (en) | Concrete homogeneity testing method | |
| CN111443190A (en) | Steel slag asphalt mixture volume expansion tester and test method | |
| CN208766075U (en) | A kind of convenient and fast gravity flowing levelling mortar fluidity tester | |
| CN104990839B (en) | A kind of sealing material permeability test device of mist containing sand | |
| CN108279186B (en) | Measuring device and method for evaluating viscosity of low-fluidity and high-viscosity concrete | |
| CN110031364B (en) | Geopolymer slurry seepage and flow performance testing device and method | |
| CN110243678B (en) | 3D printing building mortar construction performance evaluation device and method | |
| CN206891901U (en) | Concrete slump test instrument | |
| CN203572696U (en) | Stress control type geotechnical sample compactor | |
| CN206788077U (en) | A kind of sleeve grouting material expansion rate detection means | |
| CN1484013A (en) | Instrment for testing geotextile permeability and silting property | |
| CN205374240U (en) | Loading concrete pore structure evolution normal position monitoring devices | |
| CN115704761A (en) | Method and device for rapidly detecting groutability of large-gap asphalt mixture | |
| CN205015334U (en) | A device that is arranged in layering of laboratory model testing survey soil body to subside | |
| TWI220681B (en) | A simulation system and method of a grouting test body | |
| CN210123390U (en) | Simple equipment for quickly and accurately measuring dry volume weight of hardened concrete | |
| CN209878539U (en) | Test device for evaluating viscosity reduction performance of viscosity reduction type polycarboxylate superplasticizer | |
| CN220982264U (en) | Cement mortar early settlement deformation monitoring test device | |
| CN220473478U (en) | Device for rapidly detecting performance of pouring sealant for packaging ultrafiltration membrane component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |