CN107132148B - Method for detecting main indexes of concrete aggregate - Google Patents
Method for detecting main indexes of concrete aggregate Download PDFInfo
- Publication number
- CN107132148B CN107132148B CN201710504533.7A CN201710504533A CN107132148B CN 107132148 B CN107132148 B CN 107132148B CN 201710504533 A CN201710504533 A CN 201710504533A CN 107132148 B CN107132148 B CN 107132148B
- Authority
- CN
- China
- Prior art keywords
- concrete aggregate
- concrete
- water
- aggregate
- container bottle
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The invention discloses a method for detecting main indexes of concrete aggregate, which is a complete experiment through simple and reasonable concrete aggregate detection stepsAll the data required for calculating the main technical indexes of water absorption, apparent density, bulk density and bulk porosity of the concrete aggregate can be obtained by the method that the water absorption is (m)3+m0‑m1)×u1/(m1‑m0) X 100%, apparent density { (m)1‑m0)/[(m1+m4‑m2‑m0)×u1]}‑u21000, bulk density ═ m1‑m0)/(m4‑m0) The x 1000 is the formula of the bulk density/apparent density x 100%, namely, the result is obtained by calculation, the standing or soaking time of the concrete aggregate can be greatly shortened, and the detection timeliness is further improved.
Description
Technical Field
The invention relates to a method for detecting the production quality of concrete aggregate, in particular to a method for detecting main indexes of the concrete aggregate.
Background
The technical indexes of a lot of concrete aggregates are key factors for configuring and adjusting the proportion of various concretes, so that the timely and accurate control of the related technical indexes of the concrete aggregates is the premise of reasonably designing various concrete products. But the daily detection indexes of the concrete aggregate are more, and the detection time is longer according to the requirements of the industry standard. For example, all concrete aggregates need to be dried to constant weight for more than 24 hours, and need to be soaked for more than 2 hours when mud content is detected, need to be soaked for more than 24 hours when mud block content is detected, need to be left standing for more than 24 hours when aggregate water absorption is detected, then use a hand-held blower to evaporate water for more than about 4 hours, and need to be left standing for more than 24 hours when apparent density is detected. And only one technical index of the concrete aggregate is detected at a time, and the detection of all the technical indexes of the concrete aggregate generally needs 7-10 days and takes too long time. In fact, the concrete aggregate is used in a large amount, and the storage place of the stock ground is limited, so that the concrete aggregate is required to be used on the same day when entering the stock ground. The concrete aggregate is large in dosage and relatively poor in production stability, and related technical indexes have to be detected to scientifically and reasonably adjust the production proportion.
In order to solve the problems, the quality of concrete is effectively controlled, and the problem of timeliness of concrete aggregate detection is solved.
Disclosure of Invention
The invention aims to solve the problem of poor timeliness of concrete aggregate detection, and provides a method for detecting multiple main indexes of concrete aggregate in a fusion manner, namely, multiple main technical indexes of the concrete aggregate are detected quickly and simply in one experiment.
The technical scheme of the invention is as follows:
a method for detecting main indexes of concrete aggregate, wherein the main indexes comprise water absorption, apparent density, bulk density and bulk porosity, and the method is characterized by comprising the following steps:
the first step is as follows: sampling concrete aggregate, and drying for later use;
the second step is that: taking an empty container bottle and a cover plate, wherein the total mass of the empty container bottle and the cover plate is m0，Filling the concrete aggregate dried in the first step into the empty container bottle to a position higher than the container bottle mouth, using the cover plate to horizontally push and remove the excess concrete aggregate at the container bottle mouth, weighing the total mass, and recording the total mass as m1；
The third step: filling clear water into the horizontally pushed container bottle, standing, discharging bubbles, weighing the total mass, and recording as m2；
The fourth step: pouring out the concrete aggregate and clear water in the container bottle in the third step, removing the clear water on the outer surface of the concrete aggregate, weighing the concrete aggregate without clear water, and recording the mass as m3；
Another empty bottle and a cover slip as in the second step were taken and filled with water, and the total mass was weighed to m4，
The fifth step: and (3) calculating:
water absorption rate of (m)3+m0-m1)×u1/(m1-m0) X 100%, in units: percent;
apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3 ；
Bulk density ═ m1-m0)/(m4-m0) X 1000, in units of: kg/m3 ；
Bulk porosity ═ 1-bulk density/apparent density × 100%, in units of: %, wherein said bulk density is (m)1-m0)/(m4-m0) X 1000, singlyThe bit is as follows: kg/m3The said apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3；
Wherein u is1Is a water absorption correction coefficient of concrete aggregate, u2Is a water temperature correction coefficient.
The main reason that the concrete aggregate needs to be kept still for more than 24 hours in the third step is that the concrete aggregate needs to be kept still in general, but the time for keeping the concrete aggregate still is shortened to 30-40 min by setting the water absorption correction coefficient of the concrete aggregate, so that the detection timeliness is effectively improved, all data for calculating the main technical indexes of the concrete aggregate can be obtained through a simple experiment, and the data for calculating the main technical indexes of the concrete aggregate are obtained through a corresponding calculation formula; in addition, 3-5 groups of parallel experiments can be performed simultaneously, so that the accuracy of the detection result is improved.
In addition, when the main indexes of the concrete aggregate, such as water absorption, apparent density, stacking density and stacking porosity, are detected, the detection results are different when the concrete aggregate is naturally stacked or is closely stacked. The natural state of the concrete aggregate is that the concrete aggregate is piled up by the gravity of the concrete aggregate; the compact state of the concrete aggregate is formed under the action of other forces besides the gravity of the concrete aggregate. The technical scheme of the invention can measure the main technical indexes of the concrete aggregate in two states.
Preferably, the water absorption correction coefficient u of the concrete aggregate1The measuring method comprises the following steps:
the method comprises the following steps: dividing the concrete aggregate in the first step into two groups C and D, respectively filling the two groups C and D into empty container bottles, weighing the total mass, recording as C and D, wherein both the C and the D are more than zero, filling the empty container bottles with clear water, standing the group C for 30-40 min, standing the group D for more than 24h,
step two: pouring out the concrete aggregate in the container bottle in the first step, removing clear water on the outer surface of the concrete aggregate, weighing C, D the mass of the two groups of concrete aggregates with the surface clear water removed respectively, and recording the mass as mc、md，
Step three: the calculation is carried out according to the calculation,
u1＝(c×md)/(d×mc)。
preferably, the groups C and D are respectively packaged into 2-5 groups.
The concrete aggregate water absorption correction coefficient can be effectively obtained through a preferable technical scheme, but the acquisition of the concrete aggregate water absorption correction coefficient consumes a large amount of time, and in addition, the concrete aggregate comprises different types, such as fine aggregate and coarse aggregate, the particle size of the fine aggregate is below 4.75mm, and the particle size of the coarse aggregate is above 4.75 mm; because the water absorption correction coefficients of the concrete aggregates of the same type are the same, in order to save the detection time, the detection can be carried out for standby by taking out the weekday time, and thus, the detection timeliness of the concrete aggregates can be effectively improved.
Preferably, the water temperature correction coefficient u2And measuring the temperature of the clean water in the third step, recording the temperature as T, and looking up the table to obtain the temperature. In the invention, when the apparent density and the stacking density are calculated, the mass of water is converted into the volume of concrete aggregate or naturally stacked, and the density of water changes along with the temperature of water, so the invention measures the water temperature of clean water through a thermometer, and obtains a water temperature correction coefficient u by looking up a related table about the quality of sand and stone for common concrete and the standard of a detection method in the national institute of people's republic of China industry Standard JGJ052-20062And the accuracy of the detection result is improved.
Preferably, the clear water surface in the volumetric flask is kept higher than the concrete aggregate surface by more than 1cm during the third standing step.
Preferably, if the cover plate is used for horizontally pushing the bottle mouth of the container, bubbles are left on the bottle mouth, a dropper is used for adding water, and then the cover plate is horizontally pushed to remove the bubbles below the cover plate.
The invention aims to completely remove the bubbles in the bottle and the concrete aggregate by keeping the clear water surface in the volumetric flask higher than the concrete aggregate surface by more than 1cm and using the dropper to horizontally push the cover plate to remove the bubbles, and finally the concrete aggregate or the naturally-piled accurate volume is obtained by the mass conversion of water.
Preferably, the standing time of the third step is 30-40 min. Generally, concrete aggregate needs more than 24 hours for soaking or standing, and the main purpose is to allow moisture to fully enter the concrete aggregate and to remove air in the aggregate; according to a large number of experiments, the concrete aggregate with the particle size of less than 40mm is soaked or kept still for 30-40 min, the water absorption rate of the concrete aggregate basically reaches 98%, the water absorption increase in the later period is very small, the accuracy of a detection result is not greatly influenced, and the concrete aggregate can be corrected through the water absorption correction coefficient.
Preferably, the container bottle and the glass sheet are weighed at any step, and impurities do not adhere to the outer surfaces of the container bottle and the glass sheet.
Therefore, impurities attached to the container bottle and the cover plate can be effectively removed, and errors caused to the test result can be effectively eliminated.
Preferably, the temperature is controlled to be 100-110 ℃ when the concrete aggregate is dried in the first step.
In order to obtain accurate water absorption of the concrete aggregate, the interference of water absorbed by the concrete aggregate itself must be eliminated, and normal-temperature drying can be selected, but in order to achieve quick drying effect and high efficiency, the concrete aggregate is preferably dried at 100-110 ℃.
Compared with the prior art, the method has the advantages that through simple and reasonable detection steps of the concrete aggregate, all data required for calculating the main technical indexes of the concrete aggregate, such as water absorption, apparent density, bulk density and bulk porosity, can be obtained through a complete experiment; in addition, the standing or soaking time of the concrete aggregate can be greatly shortened through the water absorption correction coefficient, so that the detection timeliness is improved; in addition, considering that the temperature of the water has influence on the volume of the water, in order to improve the accuracy of the detection result, the influence of the term on the detection result is removed by the water temperature correction coefficient.
Detailed Description
Example 1
The concrete aggregate contains different types, mainly comprises fine aggregate and coarse aggregate, the grain diameter of the fine aggregate is below 4.75mm, and the grain diameter of the coarse aggregate is above 4.75 mm. The concrete aggregate of the present invention is exemplified by fine aggregate, and the concrete aggregate of the present invention will be described below.
A method for detecting main indexes of fine aggregates during natural stacking, wherein the main indexes comprise water absorption, apparent density, stacking density and stacking porosity, and the method is characterized by comprising the following steps of:
the first step is as follows: sampling fine aggregate, and drying for later use;
the second step is that: taking 500ml empty glass container bottles and glass sheets, wherein the total mass of the empty glass container bottles and the glass sheets is m0Filling the dried fine aggregate in the first step into the empty glass container bottle to a position higher than the bottle mouth of the glass container, using the glass sheet to horizontally push to remove the redundant fine aggregate at the bottle mouth of the glass container, weighing the total mass, and recording the total mass as m1；
The third step: filling clear water into the horizontally pushed glass container bottle, standing, discharging bubbles, weighing the total mass, and recording as m2；
The fourth step: pouring out the fine aggregate and clear water in the glass container bottle in the third step, removing the clear water on the outer surface of the fine aggregate by using a blast blower, weighing the fine aggregate without the clear water, and recording the mass as m3；
Another empty glass container bottle and glass sheet which are the same as the second step are taken and filled with water, and the total mass of the empty glass container bottle and the glass sheet is weighed to be m4，
The fifth step: and (3) calculating:
water absorption rate of (m)3+m0-m1)×u1/(m1-m0) X 100%, in units: percent;
apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3 ；
Bulk density ═ m1-m0)/(m4-m0) X 1000, in units of: kg/m3 ；
Bulk porosity ═ 1-bulk density/apparent density × 100%, in units of: %, wherein said bulk density is (m)1-m0)/(m4-m0) X 1000, in units of: kg/m3The said apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3；
Wherein u is1Is a water absorption correction coefficient of fine aggregate, u2Is a water temperature correction coefficient.
Preferably, the fine aggregate water absorption correction coefficient u1The measuring method comprises the following steps:
the method comprises the following steps: dividing the fine aggregate in the first step into two groups C and D, respectively filling the two groups C and D into empty glass container bottles, weighing the total mass, recording as C and D, wherein both the C and the D are more than zero, filling the bottles with clear water, standing the group C for 30-40 min, standing the group D for more than 24h,
step two: pouring out the fine aggregate in the container bottle in the first step, removing clear water on the outer surface of the fine aggregate, weighing C, D the mass of two groups of fine aggregates with the surface clear water removed respectively, and recording the mass as mc、md，
Step three: the calculation is carried out according to the calculation,
u1＝(c×md)/(d×mc)。
preferably, the groups C and D are respectively packaged into 2-5 groups.
The invention measures the water absorption correction coefficient u of the fine aggregate1Is necessary. The water absorption correction factor of the fine aggregate can be tested at any time before the test.
Preferably, the water temperature correction coefficient u2And measuring the temperature of the clean water in the third step, recording the temperature as T, and looking up the table to obtain the temperature. The temperature of the clear water in the experiment is T-15 ℃.
Preferably, the clear water surface in the volumetric flask is kept higher than the concrete aggregate surface by more than 1cm during the third standing step; effectively removing the air in the fine aggregate and the container bottle is an effective means for improving the accuracy of the test result. The mode of keeping the clear water surface in the volumetric flask to be 1cm higher than the concrete aggregate surface is simple and convenient.
Preferably, if the cover plate is used for horizontally pushing the bottle mouth of the container, bubbles are left on the bottle mouth, a dropper is used for adding water, and then the cover plate is horizontally pushed to remove the bubbles below the cover plate. When pushing flat with a glass sheet, air bubbles may remain on the lower surface of the glass sheet, which must be eliminated.
Preferably, the standing time of the third step is 30 min.
Preferably, the container bottle and the glass sheet are weighed at any step, and impurities do not adhere to the outer surfaces of the container bottle and the glass sheet. Thus, errors caused by other impurities to the pollution of the container bottle and the glass sheet can be eliminated.
Preferably, the temperature is controlled to be 100-110 ℃ when the fine aggregate is dried in the first step. Therefore, the influence of the moisture absorbed by the fine aggregate on the test result can be quickly and efficiently eliminated.
Parallel experiments of 2 groups were performed simultaneously and the average was determined.
Table 1 gives the results of the tests of the fine aggregate under the conditions of example 1. From Table 1, it can be seen that the standing time is 30min, the water temperature is 15 ℃, and the water temperature correction coefficient u20.002, water absorption correction coefficient u of fine aggregate1Is 1.0001, weigh m0，m1，m2，m3And m is4The specific values of the water absorption rate, the apparent density, the bulk density and the bulk porosity can be calculated quickly through formulas.
TABLE 1 test results of technical indices of naturally piled fine aggregates
Example 2
The standing time was 40min in addition to example 1, and the other conditions were not changed.
TABLE 2 test results of technical indices of naturally piled fine aggregates
As can be seen from Table 2, when the standing time was 40min, the water absorption coefficient of the fine aggregate was unchanged, the water absorption rate was slightly increased, the apparent density was not changed greatly, the bulk density was not changed greatly, and the bulk porosity was not changed.
Example 3
On the basis of example 1, the fine aggregate was replaced by coarse aggregate, the temperature of the clear water was 20 ℃, and the other conditions were unchanged.
TABLE 3 test results of natural piled coarse aggregates technical index
Table 3 gives the results of the tests of the coarse aggregate under the conditions of example 3. From Table 3, it can be seen that the standing time was 30min, the water temperature was 20 ℃, the water temperature correction factor increased to 0.005, and the water absorption correction factor u of the coarse aggregate1The value increased to 1.0002, weighing m0，m1，m2，m3And m is4The specific values of the water absorption rate, the apparent density, the bulk density and the bulk porosity can be calculated quickly through formulas.
Example 4
On the basis of the embodiment 1, the fine aggregate is compacted in a glass container bottle under the action of manual beating or vibration and the like, so that the fine aggregate is compacted and other conditions are not changed.
Table 4 test results of technical indexes of fine aggregate in compact state
Table 4 gives the results of the tests of the fine aggregate under the conditions of example 4. From Table 4, it can be seen that the water absorption of the fine aggregate was not changed, the apparent density was not changed much, the compact density was increased, and the compact porosity was decreased under the external force.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but the present invention should not be construed as being limited to the protection scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the invention, which falls within the scope of the invention.
Claims (8)
1. A method for detecting main indexes of concrete aggregate, wherein the main indexes comprise water absorption, apparent density, bulk density and bulk porosity, and the method is characterized by comprising the following steps:
the first step is as follows: sampling concrete aggregate, and drying for later use;
the second step is that: taking an empty container bottle and a cover plate, wherein the total mass of the empty container bottle and the cover plate is m0Filling the empty container bottle with the concrete aggregate dried in the first step to a position higher than the container bottle mouth, using the cover plate to horizontally push and remove the excess concrete aggregate on the container bottle mouth, weighing the total mass, and recording the total mass as m1；
The third step: filling clear water into the horizontally pushed container bottle, standing, discharging bubbles, weighing the total mass, and recording as m2；
The fourth step: pouring out the concrete aggregate and clear water in the container bottle in the third step, removing the clear water on the outer surface of the concrete aggregate, weighing the concrete aggregate without clear water, and recording the mass as m3；
Another empty bottle and a cover slip as in the second step were taken and filled with water, and the total mass was weighed to m4，
The fifth step: and (3) calculating:
water absorption rate of (m)3+m0-m1)×u1/(m1-m0) X 100%, in units: percent;
apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3；
Bulk density ═ m1-m0)/(m4-m0) X 1000, in units of: kg/m3；
Bulk porosity ═ 1-bulk density/apparent density × 100%, in units of: %, wherein said bulk density is (m)1-m0)/(m4-m0) X 1000, in units of: kg/m3The said apparent density { (m)1-m0)/[(m1+m4-m2-m0)×u1]}-u2} × 1000, units: kg/m3；
Wherein u is1Is a water absorption correction coefficient of concrete aggregate, u2A water temperature correction coefficient;
wherein the water absorption correction coefficient u of the concrete aggregate1The measuring method comprises the following steps:
the method comprises the following steps: dividing the concrete aggregate in the first step into two groups C and D, respectively filling the two groups C and D into empty container bottles, weighing the total mass, recording as C and D, wherein both the C and the D are more than zero, filling the empty container bottles with clear water, standing the group C for 30-40 min, standing the group D for more than 24h,
step two: pouring out the concrete aggregate in the container bottle in the first step, removing clear water on the outer surface of the concrete aggregate, weighing C, D the mass of the two groups of concrete aggregates with the surface clear water removed respectively, and recording the mass as mc、md，
Step three: the calculation is carried out according to the calculation,
u1＝(c×md)/(d×mc)。
2. the method for detecting the main indexes of the concrete aggregate according to claim 1, wherein the two groups C and D are respectively packaged into 2-5 groups.
3. The method for detecting the main index of the concrete aggregate according to claim 1, wherein the water temperature correction coefficient u2And measuring the temperature of the clean water in the third step, recording the temperature as T, and looking up the table to obtain the temperature.
4. The method for detecting the main index of the concrete aggregate according to claim 1, wherein the clear water level in the volumetric flask is kept higher than the concrete aggregate level by more than 1cm during the third standing step.
5. The method for detecting the main indexes of the concrete aggregates as claimed in claim 1, wherein if the cover plate is used for horizontally pushing the opening of the container, bubbles are left on the opening, water is added by a dropper, and then the cover plate is horizontally pushed to remove the bubbles below the cover plate.
6. A method for detecting main indexes of concrete aggregates according to claim 1, wherein the standing time of the third step is 30-40 min.
7. The method for detecting the main index of the concrete aggregate according to claim 1, wherein impurities do not adhere to the outer surfaces of the container bottle and the cover plate when the container bottle and the cover plate are weighed at any step.
8. A method for detecting main indexes of concrete aggregates according to claim 1, wherein the temperature for drying the concrete aggregates in the first step is controlled to be 100-110 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504533.7A CN107132148B (en) | 2017-06-28 | 2017-06-28 | Method for detecting main indexes of concrete aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504533.7A CN107132148B (en) | 2017-06-28 | 2017-06-28 | Method for detecting main indexes of concrete aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107132148A CN107132148A (en) | 2017-09-05 |
| CN107132148B true CN107132148B (en) | 2020-01-10 |
Family
ID=59736493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710504533.7A Active CN107132148B (en) | 2017-06-28 | 2017-06-28 | Method for detecting main indexes of concrete aggregate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107132148B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090280A (en) * | 2000-09-13 | 2002-03-27 | Marui:Kk | Apparent density-measuring instrument of concrete sample |
| CN102346121A (en) * | 2010-07-29 | 2012-02-08 | 中冶天工上海十三冶建设有限公司 | Quick detection method for fine aggregate water content |
| CN104535458A (en) * | 2015-01-09 | 2015-04-22 | 东南大学 | Determination method for bulk density and clearance rate of coarse aggregates |
| CN105699274A (en) * | 2016-04-13 | 2016-06-22 | 青神鑫统领建材有限公司 | Coarse aggregate voidage testing device and method |
-
2017
- 2017-06-28 CN CN201710504533.7A patent/CN107132148B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090280A (en) * | 2000-09-13 | 2002-03-27 | Marui:Kk | Apparent density-measuring instrument of concrete sample |
| CN102346121A (en) * | 2010-07-29 | 2012-02-08 | 中冶天工上海十三冶建设有限公司 | Quick detection method for fine aggregate water content |
| CN104535458A (en) * | 2015-01-09 | 2015-04-22 | 东南大学 | Determination method for bulk density and clearance rate of coarse aggregates |
| CN105699274A (en) * | 2016-04-13 | 2016-06-22 | 青神鑫统领建材有限公司 | Coarse aggregate voidage testing device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107132148A (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103592201B (en) | Measure volume displacement method and the equipment of soil bulk density | |
| CN102226803B (en) | Detection method of early autogenous shrinkage of cement mortar | |
| CN103149116B (en) | Rapid determination method of sand-carrying capacity of sewage | |
| CN110082250A (en) | A method of quickly detecting non-cohesive soil moisture content | |
| CN107132148B (en) | Method for detecting main indexes of concrete aggregate | |
| CN106830791A (en) | A kind of non-fine concrete surface area mix calculation method | |
| CN108548747A (en) | The portable measuring method for measuring of soil mechanical composition | |
| CN111562194B (en) | Quick test method for MB value of machine-made sand | |
| CN109490192A (en) | A kind of test method of pitch and coarse aggregate adhesion | |
| CN104833609A (en) | Measurement method for density and water absorption rate of regenerated coarse aggregates | |
| CN109060589A (en) | A method of measurement soil agreegate | |
| CN115096747B (en) | Method for measuring performance index of concrete continuous grading aggregate | |
| CN103512835A (en) | Concrete machine-made sand irregular particle shape content determining method and device | |
| CN111272250A (en) | Method for measuring volume and density of solid object | |
| CN114276078A (en) | Inorganic stone plate containing artificial stone waste and preparation method thereof | |
| CN103592202A (en) | Volume substitution method for measuring volume weight and moisture content of soil and equipment | |
| CN104390879B (en) | A kind of concrete Machine-made Sand sheet-like particle content assaying method | |
| CN112362529A (en) | Soil volume weight determination method | |
| CN206766083U (en) | A kind of high reagent transfer device of stability | |
| CN207798232U (en) | A kind of weighting platforms of vehicle scale that stability is good | |
| CN106442273B (en) | Straw permeability coefficient testing device and testing method | |
| CN112824869A (en) | Method for detecting solid content of waste slurry and waste liquid | |
| CN215492953U (en) | Device for measuring moisture content of fine aggregate | |
| CN201196620Y (en) | Cereal moisture fast measuring instrument by buoyant force method | |
| CN203203984U (en) | Rapid measurement device of silt content of sewage |
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 |