CN112485152A - Method for judging river sand quality - Google Patents
Method for judging river sand quality Download PDFInfo
- Publication number
- CN112485152A CN112485152A CN202011440274.4A CN202011440274A CN112485152A CN 112485152 A CN112485152 A CN 112485152A CN 202011440274 A CN202011440274 A CN 202011440274A CN 112485152 A CN112485152 A CN 112485152A
- Authority
- CN
- China
- Prior art keywords
- sample
- mortar
- river sand
- fluidity
- mud content
- 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.)
- Pending
Links
- 239000004576 sand Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 75
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 239000004568 cement Substances 0.000 claims description 25
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 description 59
- 239000004567 concrete Substances 0.000 description 11
- 239000011083 cement mortar Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
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
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- 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 relates to a river sand quality judgment method, which comprises the following steps: measuring the mud content of a sample to be judged, wherein the sample is unqualified when the measured mud content is larger than a set mud content threshold value; preparing sample mortar by using a sample with the mud content not greater than a set mud content threshold value; carrying out fluidity test on the sample mortar to obtain fluidity loss of the sample mortar between two test moments; and comparing the obtained fluidity loss with a loss threshold range, wherein when the fluidity loss is within the loss threshold range, the sample is qualified, otherwise, the sample is unqualified.
Description
Technical Field
The invention relates to the technical field of civil engineering tests, in particular to a method for judging river sand quality.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
River sand refers to a building material with a certain quality standard formed by the action of natural force of natural stones and the impact and erosion of river water in river water, and can be widely applied to various dry-mixed mortar after being dried and screened, and has irreplaceable effect in the building industry. The weathered sand is a substance which is broken and loosened after the rock is subjected to long-time solar radiation, atmosphere and water, has poor durability compared with common soil materials, weak strength and unstable physical and mechanical properties, and contains a certain amount of fine soil particles.
Compared with river sand, the weathered sand is low in price and easy to obtain, but various property indexes of the weathered sand cannot meet the requirements of construction materials, and if the weathered sand is used for mixing concrete, the concrete quality is greatly influenced, so that the slump loss of the concrete is fast, and the strength, durability and workability of the concrete are influenced. In recent years, the concrete entity strength is seriously lower than the designed strength grade due to improper use of weathered sand, and the phenomenon of large-area cracking of concrete occurs, so that certain difficulty is brought to the control of construction quality.
The existing sandstone material has disordered market, the quality of the material is great, the phenomenon is serious, the problem that weathered sand with poor quality overflows as river sand is very common, and the inherent defect is brought to the homogeneity of concrete once the weathered sand is used. In addition, the material distinguishing difficulty of the tester and the constructor is greatly increased.
The inventor finds that no mature and systematic weathered sand and river sand distinguishing method and standard specification exist in the industry at present, and the weathered sand and river sand are easily affected by subjective factors if judged by experience only, and the distinguishing error is large, so that the difficulty coefficient of raw material quality control in engineering application is increased along with the increase of the difficulty coefficient, and hidden danger is buried for engineering construction quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a river sand quality judgment method, effectively solves the problem of high difficulty in river sand quality control in engineering application, and ensures the engineering quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for determining river sand quality, including the following steps:
measuring the mud content of a sample to be judged, wherein the sample is unqualified when the measured mud content is larger than a set mud content threshold value;
preparing sample mortar by using a sample with the mud content not greater than a set mud content threshold value;
carrying out fluidity test on the sample mortar to obtain fluidity loss of the sample mortar between two test moments;
and comparing the obtained fluidity loss with a loss threshold range, and when the fluidity loss is within the loss threshold range, the sample is qualified, otherwise, the sample is unqualified.
Further, the modulus of fineness of the material of the sample to be judged is 2.3-3.0.
Further, when the mud content is measured, at least two mud content measurement tests are carried out, and the arithmetic mean value is taken as the mud content of the sample to be judged.
Further, the sample mortar is a mixture of cement, a sample and water in a set mass ratio, and the preparation method of the sample mortar comprises the following steps: weighing cement and water in a set mass ratio, mixing, adding the sample after stirring for a set time, and continuing stirring for a set time to finish the preparation of the sample mortar.
And further, adding a water reducing agent during sample mortar preparation, and stirring the water reducing agent together with cement and water.
Further, multiple sets of control experiments were set to determine the range of loss thresholds.
Furthermore, in the contrast experiment, the mortars for performing the fluidity test are respectively standard sand mortar and a plurality of groups of river sand mortar, the standard sand mortar is a mixture of cement, standard sand and water in a set proportion, and the river sand mortar is a mixture of cement, river sand and water in a set proportion.
Further, alkali water is added in the preparation process of the standard sand mortar and the river sand mortar.
Furthermore, a mortar fluidity tester is adopted to test the fluidity of the sample mortar, the standard sand mortar and a plurality of groups of river sand mortar, and the time interval between the two test moments is 25-35 min.
Further, the fluidity test is carried out at a temperature of 20. + -. 2 ℃ and a relative humidity of > 50%.
The invention has the beneficial effects that:
1. the method provided by the invention judges the quality condition of the sample through the mud content and the fluidity, adopts the existing mud content and fluidity test equipment and method, has simple and convenient process, is convenient and quick, saves manpower and material resources, is suitable for standardized management, judges through objective data obtained by the test, has high accuracy, avoids the defects that the result is influenced by subjective factors and the discrimination error is large due to subjective experience judgment, reduces the difficulty of quality control of the raw material in engineering application, ensures the safety of engineering construction, and can create more economic value and social benefit.
2. The method can more accurately control the quality of the river sand entering the field, quantize indexes, standardize the inspection method and facilitate the enhancement of laboratory management by setting a contrast experiment and comparing the quality with the indexes.
3. According to the method, the slump loss is replaced by the fluidity loss to quantify the material performance, broken stones do not need to be added, the material is saved, and the problems of more mixed materials, difficult control and the like in the slump test can be solved.
4. The method reflects the water absorption problem of the material in the application process to reflect the construction workability and the fluidity of the material to be tested when being used for mixing concrete.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flowchart of a determination method according to an embodiment of the present invention;
FIG. 2 is a graph showing the relationship between the loss of fluidity of river sand and the content of sludge;
FIG. 3 is a graph of the fluidity loss of weathered sand versus the mud content;
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the quality of the river sand for engineering is judged only by experience at present, is influenced by subjective factors, and has large identification error.
In an exemplary embodiment of the present application, as shown in fig. 1, a method for determining river sand quality, where a material fineness modulus of a sample to be determined is 2.3-3.0, and all the following steps are performed on this premise, the method includes the following steps:
step 1: measuring the mud content of a sample to be judged, wherein the sample is unqualified when the measured mud content is larger than a set mud content threshold value;
the mud content determination in the step 1 is to carry out mud content detection on a sample to be judged according to a mud content test (screening method) of T0333-2000 fine aggregate in JTG E42-2005 Highway engineering aggregate test regulation.
In the step 1, the calculation method of the mud content comprises the following steps:
in the formula: qnIs the mud content (%) of the sample; m is the dried sample mass (g) before the test; m' is the oven dried sample mass (g) after the test.
When measuring the mud content, the arithmetic mean value of the test results of two groups of samples is used as the mud content measuring value of the sample, and if the difference value of the two results exceeds 0.5%, the sample is taken again for test.
Setting the mud content threshold value to be 3.0, and measuring the measured mud content QnIf the sample content is more than 3.0 and does not meet the mud content standard, judging that the sample is unqualified, and if Q is not qualifiednLess than or equal to 3.0, and the sample to be judged enters the next judging step if the mud content meets the standard.
Step 2: preparing sample mortar for the sample screened in the step 1, wherein the sample contains mud which is not more than a set mud content threshold value;
in this embodiment, a plurality of sets of control experiments are set, and standard sand mortar and a plurality of sets of river sand mortar need to be prepared in the control experiments.
The material proportion and mixing of the sample mortar, the standard sand mortar and the river sand mortar are based on the requirements specified in GBT 17671-1999 method for testing cement mortar strength (ISO method) and JC/T681-2005 planetary cement mortar stirrer.
The sample mortar is cement, a sample and water which are mixed according to a set mass ratio, and the mass mixing ratio of the cement mortar is one part of cement, three parts of sand and half part of water, namely cement: sand: 1 part of water: 3: 0.5. in order to better simulate the actual effect of concrete, 1 percent of water reducing agent needs to be additionally added. And finally designing the mix proportion cement: sand: water 2.5:5:1, so the ratio of cement, sample and water is 2.5:5:1.
The preparation method comprises the following steps: weighing water and cement according to a set mass ratio, adding the water reducing agent into a pot, and selecting a proper adding time for the state of the water reducing agent, wherein specifically, the powdery water reducing agent is added into the pot together with powder materials such as cement, and the liquid water reducing agent is added into the pot together with the water.
After the cement mortar stirrer is used for stirring at a low speed for a set time, the sample is uniformly added into the mixture, and the stirring speed at the low speed is as follows: and rotating a rotating shaft of the stirrer for 140 +/-5 r/min and revolving for 62 +/-5 r/min, and completely and uniformly mixing the mixture according to the standard requirement to finish the preparation of the sample mortar. The set time is 30 s.
The preparation methods of the standard sand mortar and the river sand mortar are the same as the preparation method of the sample mortar, and the difference is that the standard sand mortar is obtained by replacing the sample with the same-mass ISO standard sand, the river sand mortar is obtained by replacing the sample with the same-mass river sand, and the specific preparation process is not repeatedly described here.
And step 3: carrying out fluidity test on the sample mortar, the standard sand mortar and a plurality of groups of river sand mortar to carry out fluidity test, and obtaining fluidity losses of the sample mortar, the standard sand mortar and the river sand mortar between two test moments;
the fluidity test is completed by using a mortar fluidity tester under the conditions that the standard temperature of a laboratory is 20 +/-2 ℃ and the relative humidity is more than 50 percent based on the specification of GBT-2419-2005 'cement mortar fluidity test method'.
Taking the mortar, carrying out fluidity test to determine the fluidity value, wherein the fluidity value at the first set moment is recorded as d, standing the mortar for 25-35 min, and measuring the fluidity value of the mortar again at the second set moment as d ', so that the fluidity loss s is d-d'.
d. d' is the material fluidity value after the mortar is kept still in the pot for 30min, namely the calipers measure the average value of the diameters of the mortar in two mutually perpendicular directions.
And 4, step 4: and determining a loss threshold range according to the fluidity test results of the standard sand mortar and the river sand mortar, comparing the fluidity loss of the obtained sample mortar with the loss threshold range, and when the fluidity loss is within the loss threshold range, namely the fluidity loss meets the standard requirement, the sample is qualified, otherwise, the sample is unqualified.
And establishing a material discrimination standard based on the experiment so as to be used as a reference for the inspection of the new material at the later stage.
The inventors have found that the magnitude of the loss of fluidity of the material is greatly influenced by the type of material and its content of sludge. The weathered sand has small density and more pores due to long-term weathering effect, so that the water absorption of the material is higher than that of standard sand and river sand in the fluidity test process, and the fluidity loss of the weathered sand is higher in the same test time; in the case of the same material, if the mud content of the material is different, the fluidity loss value is also greatly different. By fully utilizing the property, the bad materials are effectively eliminated, and unexpected technical effects are obtained.
The fluidity test is carried out by selecting standard sand, qualified river sand, known qualified weathered sand with mud content and river sand material with higher mud content under the conditions that the standard temperature of a laboratory is 20 +/-2 ℃ and the relative humidity is more than 50 percent, and the test results are as follows:
according to the test data, the results show that: firstly, the fluidity loss value of river sand with unqualified mud content is larger, and the relation graph of the fluidity loss of the river sand and the mud content shown in figure 2 is combined, the mud content is larger than 3 percent of the river sand, and the fluidity loss value is larger, so that the influence of the mud content on the material fluidity loss test is firstly eliminated; secondly, the loss value of the fluidity of the weathered sand is obviously larger than that of standard sand and qualified river sand, and by combining the relationship graph of the loss of the fluidity of the weathered sand and the mud content in the graph shown in FIG. 3, the loss value of the fluidity of the feed is larger than 15mm on the premise that the mud content meets the standard, and the feed can be judged as weathered sand, namely the river sand is unqualified.
The method of the embodiment has the advantages of simple and convenient flow, easy control and standardized management, convenience, rapidness, manpower and material resource saving, more accurate control of the quality of the river sand entering the field and quantitative index through test comparison, standard standardization of the inspection method, convenience for enhancing laboratory management, and suitability for popularization and application. The fluidity loss is adopted to replace slump loss to quantify the material performance, broken stones do not need to be added, and the problems of more mixed materials, difficult control and the like in the slump test can be solved while the materials are saved. In addition, in the application process of the method, the problem of water absorption of the material can be reflected on the other hand, so that the construction workability and the fluidity of the material used for mixing concrete are reflected.
An application example 1 of this embodiment mode.
The new approach material needs to be tested according to the mud content test (screening method) requirement of T0333-2000 fine aggregate in JTG E42-2005 Highway engineering aggregate test regulation, and the mud content of the sample is calculated to 0.1% according to the formula.
In the formula: qnIs the mud content (%) of the sample; m is the dried sample mass (g) before the test; m' is the oven dried sample mass (g) after the test.
The arithmetic mean of the test results of the two samples was taken as the measured value. When the difference between the two results exceeds 0.5%, the test should be performed by sampling again.
In the mud content test, according to the test protocol, about 400g (m) of sample is weighed per part by mass. The final mud content needs to meet the following requirements: qnLess than or equal to 3.0. If the mud content of the incoming material meets the standard requirement, continuing to perform the next detection; otherwise, the batch is not qualified and the stock yard is not accepted.
For three batches of new entrances, 400g of each batch is taken for mud content detection, and the test results are shown in the following table 1:
table 1 example 1 mud content test results
Under the same examination, the mud contents of samples 1 and 3 were 3.8% and 3.3%, respectively, and Q was not satisfiednThe requirement of less than or equal to 3.0, the material is unqualified; sample 2 meets the mud content standard and needs to be subjected to next fluidity detection by primary screening. Sample 2 was selected as the next test material this time, and sample 2 is referred to as unknown hereinafter.
According to the requirements of GBT 17671-: standard sand: 1 part of water: 3: 0.5. in order to better simulate the actual effect of concrete, 1 percent of water reducing agent needs to be additionally added. And finally designing the mix proportion cement: sand: water 2.5:5:1.
the standard sand group is set as a control group 1, the river sand 2 and the river sand 3 respectively correspond to the control group 2, the control group 3 and the control group 4, and the sample to be judged is a test group.
Control group 1: weighing 400g of cement, 800g of standard sand, 160g of water and 4g of water reducing agent respectively, adding the water and the cement into the pot in sequence, and selecting proper adding time for the water reducing agent according to the state: the powdery water reducing agent is added together with the powder materials such as cement, and the liquid water reducing agent is added together with water. And (3) after stirring for 30s at a low speed by using a cement mortar stirrer, uniformly adding the standard sand at the beginning of the second 30s, and completely and uniformly stirring the materials according to the standard requirement to finish the preparation of the standard sand mortar.
And (3) preparing cement mortar from the control groups 2, 3 and 4 and the test group (the standard sand is replaced by river sand or a sample with the same gram number) in the same way as the control group 1, and finishing the preparation of two groups of river sand mortar and sample mortar.
According to the test specification of GBT-2419-; at the same time, the stirred mortar was allowed to stand for 30min, and its fluidity value was measured and recorded as d'.
The measurement of the diffusion diameter should be completed within 6min from the start of the addition of water to the mortar. And after the jump table jumps, measuring the diameters of the two mutually perpendicular directions of the bottom surface of the mortar by using a caliper, calculating an average value, and taking an integer with the unit of millimeter. The average value is the fluidity of the cement mortar of the water amount.
Calculating the fluidity loss s of each group, and defining the range of the fluidity of qualified sand materials, namely the loss threshold range, according to the test results of four groups of control groups: if the fluidity value of the experimental group accords with the marked range, the material is usable river sand; otherwise, the material does not meet the material requirement of the stock ground, and is unqualified, namely weathered sand or stewed sand (weathered sand doped in river sand).
Loss of fluidity s ═ d-d'
The results of the fluidity test are shown in Table 2.
Table 2 example 1 results of fluidity test
Under the test scheme, the comparison group 1 has good performance, when the jumping table jumps 23 times, the jumping table exceeds the range of 300mm of the disc table top, and the first-time fluidity value is recorded as 300 mm; the initial fluidity values of the control groups 2, 3 and 4 are between 280mm and 300mm, and the fluidity values are almost unchanged after standing for 30 min.
After standing for 30min, compared with a control group test, the fluidity loss of the material of the test group is serious, the loss reaches 76mm, and the material of the test group can be judged to be weathered sand or stewed sand.
According to the test result, the fluidity loss of the problematic material is obviously larger, and the fluidity loss of the qualified material is less than 10 mm. Thus, the results of multiple tests can be combined to determine an acceptable material fluidity range.
In another example 2 of this embodiment:
for four batches of new entering fields, 400g of the materials are respectively taken for mud content detection, and the test results are shown in the following table 3:
table 3 example 2 mud content test results
Wherein, the mud content of the sample 2 is 3.6 percent, and does not satisfy Qn less than or equal to 3; samples 1 and 3 meet the requirements of mud content, and are taken for the next fluidity test.
Taking standard sand as a reference group 1, wherein river sand 1 and river sand 2 respectively correspond to a reference group 2 and a reference group 3, and samples 1 and 3 respectively correspond to a test group 1 and a test group 2 respectively as an unknown material 1 and an unknown material 2.
Weighing 400g of cement, 800g of standard sand/river sand 1/river sand 2/unknown material 1/unknown material 2, 160g of water and 4g of water reducing agent respectively, adding the water and the cement into a pot in sequence, and selecting proper adding time for the water reducing agent according to the state: the powdery water reducing agent is added together with the powder materials such as cement, and the liquid water reducing agent is added together with water. After stirring for 30 seconds at low speed with a cement mortar mixer, sand was added uniformly at the beginning of the second 30 seconds, and the mixture was completely and uniformly mixed for the time required by the specifications.
And (3) carrying out fluidity test on 5 groups of newly mixed materials, respectively measuring the fluidity values of the newly mixed materials and the materials standing for 30min, and calculating the fluidity loss, wherein the fluidity test result is shown in table 4.
Table 4 example 2 fluidity test results
Under the same test conditions, the test group 1 has better fluidity and the fluidity loss is 0, and is qualified river sand; the loss of fluidity of the test group 2 is serious, the value is up to 52mm, the weathered sand or the stewed sand can be judged, and the material is unqualified and is not accepted.
And (4) integrating the test results of multiple times to determine the fluidity range of the qualified material.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A river sand quality judgment method is characterized by comprising the following steps:
measuring the mud content of a sample to be judged, wherein the sample is unqualified when the measured mud content is larger than a set mud content threshold value;
preparing sample mortar by using a sample with the mud content not greater than a set mud content threshold value;
carrying out fluidity test on the sample mortar to obtain fluidity loss of the sample mortar between two test moments;
and comparing the obtained fluidity loss with a loss threshold range, and when the fluidity loss is within the loss threshold range, the sample is qualified, otherwise, the sample is unqualified.
2. The method for judging river sand quality according to claim 1, wherein the modulus of fineness of material of the sample to be judged is 2.3-3.0.
3. The method for determining river sand quality according to claim 1, wherein the mud content is measured by performing at least two mud content measurement tests, and taking an arithmetic mean value as the mud content of the sample to be determined.
4. The method for determining river sand quality according to claim 1, wherein the sample mortar is a mixture of cement, a sample and water in a predetermined mass ratio, and the preparation method of the sample mortar comprises the following steps: weighing cement and water in a set mass ratio, mixing, adding the sample after stirring for a set time, and continuing stirring for a set time to finish the preparation of the sample mortar.
5. The method for judging the quality of the river sand according to claim 4, wherein a water reducing agent is added when the sample mortar is prepared, and the water reducing agent is stirred together with cement and water.
6. The method for determining river sand quality according to claim 1, wherein a plurality of sets of control experiments are provided to determine the range of the loss threshold.
7. The method for determining river sand quality as claimed in claim 6, wherein the mortar used for the fluidity test in the control experiment is a standard sand mortar and a plurality of sets of river sand mortars, the standard sand mortar is a mixture of cement, standard sand and water in a set ratio, and the river sand mortar is a mixture of cement, river sand and water in a set ratio.
8. The method for determining river sand quality according to claim 7, wherein an alkali water agent is added in both the standard sand mortar and the river sand mortar during the preparation process.
9. The method for determining river sand quality according to claim 7, wherein a mortar sample, a standard sand mortar and a plurality of groups of river sand mortars are tested for fluidity by a mortar cement fluidity tester, and the time interval between the two test moments is 25min to 35 min.
10. The method for determining river sand quality according to claim 7, wherein the fluidity test is performed at a temperature of 20 ± 2 ℃ and a relative humidity of > 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011440274.4A CN112485152A (en) | 2020-12-11 | 2020-12-11 | Method for judging river sand quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011440274.4A CN112485152A (en) | 2020-12-11 | 2020-12-11 | Method for judging river sand quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112485152A true CN112485152A (en) | 2021-03-12 |
Family
ID=74941443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011440274.4A Pending CN112485152A (en) | 2020-12-11 | 2020-12-11 | Method for judging river sand quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112485152A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063931A (en) * | 2021-03-22 | 2021-07-02 | 云南省建设投资控股集团有限公司 | Method for detecting raw materials used in concrete production |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2163955A1 (en) * | 1998-08-10 | 2002-02-01 | Para La Investigacion Y Desarr | Chamber for measuring the muddy sand content. |
| CN102338728A (en) * | 2010-07-21 | 2012-02-01 | 上海台界化工有限公司 | Method for quickly comparing and detecting performance index of concrete water reducing agent |
| CN106442203A (en) * | 2016-09-29 | 2017-02-22 | 中建西部建设湖南有限公司 | Device and method for testing mud content of concrete sand |
| CN107884302A (en) * | 2017-11-21 | 2018-04-06 | 北京东方建宇混凝土科学技术研究院有限公司 | In a kind of measure sand the experimental rig of clay content and measure sand in clay content method |
| CN108645747A (en) * | 2018-06-15 | 2018-10-12 | 中国建筑科学研究院有限公司 | Method for measuring adsorption performance of machine-made sandstone powder |
| CN111323335A (en) * | 2018-12-14 | 2020-06-23 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Machine-made sand comprehensive evaluation method based on mortar performance |
| CN211061372U (en) * | 2019-09-29 | 2020-07-21 | 广西交通科学研究院有限公司 | Device for accurately measuring cement paste fluidity loss rate over time |
| CN111735787A (en) * | 2020-07-09 | 2020-10-02 | 兰州理工大学 | Test method for rapidly measuring mud content in machine-made sand |
-
2020
- 2020-12-11 CN CN202011440274.4A patent/CN112485152A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2163955A1 (en) * | 1998-08-10 | 2002-02-01 | Para La Investigacion Y Desarr | Chamber for measuring the muddy sand content. |
| CN102338728A (en) * | 2010-07-21 | 2012-02-01 | 上海台界化工有限公司 | Method for quickly comparing and detecting performance index of concrete water reducing agent |
| CN106442203A (en) * | 2016-09-29 | 2017-02-22 | 中建西部建设湖南有限公司 | Device and method for testing mud content of concrete sand |
| CN107884302A (en) * | 2017-11-21 | 2018-04-06 | 北京东方建宇混凝土科学技术研究院有限公司 | In a kind of measure sand the experimental rig of clay content and measure sand in clay content method |
| CN108645747A (en) * | 2018-06-15 | 2018-10-12 | 中国建筑科学研究院有限公司 | Method for measuring adsorption performance of machine-made sandstone powder |
| CN111323335A (en) * | 2018-12-14 | 2020-06-23 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Machine-made sand comprehensive evaluation method based on mortar performance |
| CN211061372U (en) * | 2019-09-29 | 2020-07-21 | 广西交通科学研究院有限公司 | Device for accurately measuring cement paste fluidity loss rate over time |
| CN111735787A (en) * | 2020-07-09 | 2020-10-02 | 兰州理工大学 | Test method for rapidly measuring mud content in machine-made sand |
Non-Patent Citations (8)
| Title |
|---|
| 于飞宇等: "浅析无泌水水泥净浆流动度与混凝土保坍性能的关系", 《混凝土》 * |
| 兰英静: "高性能水泥基灌浆材料的配制与性能研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
| 刘尊玉等: "抗泥降黏型聚羧酸减水剂的制备与性能研究", 《新型建筑材料》 * |
| 吴航等: "花岗岩机制砂需水性能的评价方法研究", 《新型建筑材料》 * |
| 沈嫣秋: "砂的颗粒级配对自流平砂浆性能的影响", 《低温建筑技术》 * |
| 王志林: "含泥量对应用复合型脂肪族减水剂水泥净浆流动性的影响研究", 《混凝土》 * |
| 王晨晨等: "泥土副作用对砂浆性能及含泥量限值的影响研究", 《赤峰学院学报》 * |
| 苗翠珍等: "含泥量对掺聚羧酸混凝土性能的影响", 《山西建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063931A (en) * | 2021-03-22 | 2021-07-02 | 云南省建设投资控股集团有限公司 | Method for detecting raw materials used in concrete production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lepech et al. | Large-scale processing of engineered cementitious composites | |
| CN108645747B (en) | Method for measuring adsorption performance of machine-made sandstone powder | |
| CN101028727B (en) | Single-speed cement concrete secondary agitating process | |
| Kim et al. | Investigation of rheological properties of blended cement pastes using rotational viscometer and dynamic shear rheometer | |
| CN101788455A (en) | Test method for anti-carbonation properties and content of admixtures of common Portland cement | |
| CN112485152A (en) | Method for judging river sand quality | |
| CN113742816B (en) | Alkali-activated bagasse ash/slag low-carbon mortar mixing proportion design method based on strength regulation and control | |
| Olusola et al. | Effect of Batching Method on the Fresh and Hardened Properties of Concrete | |
| CN114166692A (en) | Comprehensive evaluation method for performance of water reducing agent | |
| CN109100265B (en) | Rapid inspection method for fine aggregate entering field | |
| CN111912746B (en) | Quantitative evaluation method for analyzing concrete workability based on bottom resistance | |
| Rapoport et al. | Cast-in-place cellulose fiber-reinforced cement paste, mortar, and concrete | |
| CN104062397A (en) | Measuring method for MB value of recycled micro-powder | |
| Koehler et al. | Inspection manual for self-consolidating concrete in precast members | |
| CN111721893A (en) | Method for determining clay mineral composition and content of each component in mud powder in sand | |
| He et al. | Non-contact resistivity measurement for characterisation of the hydration process of cement-paste with excess alkali | |
| Assaad et al. | Formwork pressure of self-consolidating concrete containing recycled coarse aggregates | |
| CN113391056A (en) | Method for improving shrinkage cracking performance of cement-based grouting material | |
| Fr6hlich et al. | Influences on repeatability and reproducibility of testing methods for fresh UHPC | |
| Nili et al. | Proposing a new apparatus to assess the properties of self-consolidating concrete | |
| Chen et al. | Pore size distribution of cement mortar prepared with crushed limestone sand | |
| CN111505251A (en) | Method for predicting strength of cement concrete | |
| Zhang et al. | Study on Freezing-and-Thawing Durability of Cement Concrete Based on Experimental Investigation of Air-Void Parameters | |
| CN113063698A (en) | Quantitative evaluation method for cohesiveness of cement concrete mixture | |
| Girish et al. | Concrete Shear Test: A new tool for determining rheological properties of fresh Portland cement concrete |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210312 |