CN115073034A - Method for determining proportion of anti-mud concrete - Google Patents
Method for determining proportion of anti-mud concrete Download PDFInfo
- Publication number
- CN115073034A CN115073034A CN202210640610.2A CN202210640610A CN115073034A CN 115073034 A CN115073034 A CN 115073034A CN 202210640610 A CN202210640610 A CN 202210640610A CN 115073034 A CN115073034 A CN 115073034A
- Authority
- CN
- China
- Prior art keywords
- determining
- adsorption
- mud
- different
- sandstone
- 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
- 239000004567 concrete Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000001179 sorption measurement Methods 0.000 claims abstract description 107
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 70
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 66
- 239000008030 superplasticizer Substances 0.000 claims abstract description 59
- 239000002253 acid Substances 0.000 claims abstract description 58
- 239000002734 clay mineral Substances 0.000 claims abstract description 20
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 14
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052900 illite Inorganic materials 0.000 claims abstract description 8
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 7
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 7
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 12
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 10
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 125000000524 functional group Chemical group 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000002441 X-ray diffraction Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000011800 void material Substances 0.000 claims description 5
- 239000011229 interlayer Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000004927 clay Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 229910052622 kaolinite Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 241001122767 Theaceae Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- -1 fineness modulus Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008261 resistance mechanism Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention belongs to the technical field of concrete preparation, and discloses a method for determining a proportion of anti-mud concrete, which comprises the following steps: detecting the mud content of different sandstone aggregates, and quantitatively analyzing the contents of montmorillonite, kaolin and illite which are main clay minerals; detecting the adsorption capacity of different sandstone aggregates on the polycarboxylate superplasticizer; the influence of the sandstone aggregate on the adsorption characteristics of the polycarboxylate superplasticizer under the conditions of the chain length, the length of the branched chain, the pH value, the environmental salinity, the salt variety and the like of the polycarboxylate superplasticizer is used for determining the optimal concrete formula. The method applies the existing adsorption theory and research results of clay mineral components to the polycarboxylic acid water reducing agent to the actual production, determines the adsorption characteristics of the sandstone aggregate to the polycarboxylic acid water reducing agent, and has important theoretical significance and practical application value for adjusting and determining the optimal concrete formula, researching the anti-mud way and measure with high cost performance and ensuring the workability, slump retaining capacity and strength and durability of the newly-mixed concrete.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to a method for determining a proportion of anti-mud concrete.
Background
At present, concrete is a building material with the largest social application amount and the widest application range. Along with the development of society, the demand of building material industry for concrete is also increasing. To obtain high performance concrete, a high performance water reducing agent is usually added thereto. The polycarboxylic acid water reducing agent has high water reducing rate and is widely applied to large flow state concrete. However, the polycarboxylic acid water reducing agent and the raw materials of concrete have adaptability problems, for example, soil components in poor-quality sandstone materials have strong inhibiting effect on the polycarboxylic acid water reducing agent, and the concrete has the defects of quick slump loss and poor working performance. Sand and stone account for about 70% of concrete aggregate, but the production area, origin, collection and stacking and transportation conditions are different, so that the sand and stone change greatly. Wherein, the clay is an inevitable component introduced in the preparation process of concrete, the clay mainly comprises dispersed layered silicate and other minerals, the types of the clay are various, the mineral structure is greatly different, but the clay mainly comprises 3 types of kaolinite, montmorillonite and illite in summary. A large number of engineering practices have shown that the clay in the aggregate reduces the fluidity and flow retention of the blended polycarboxylate water reducer not only because the clay adsorbs a large amount of blending water, but also because the inevitable clay in the concrete aggregate adsorbs a large amount of polycarboxylate water reducer, resulting in a substantial reduction in the water reducer used for water reducing dispersion. In order to better and widely use the polycarboxylic acid water reducing agent in actual engineering and ensure the construction and quality of concrete, the research on the adsorption performance of the clay mineral component on the polycarboxylic acid water reducing agent is of great significance.
In the prior art, the concrete is prepared mainly by utilizing sandstone aggregate; the disadvantages of sandstone aggregates are their varying quality, different stone ore raw materials, different mining and production equipment, and different production processes all affect the quality of the final sandstone aggregate product, and the mud content and mud composition are very different.
The sensitivity of the polycarboxylate superplasticizer (PC) to the mud in the sand and the action mechanism thereof are one of the hot spots of concrete technical research in recent years. There are three main clay minerals in the mud that have a great influence on the polycarboxylic acid water reducing agent: kaolin, montmorillonite and illite.
At present, the adsorption behavior of soil is mainly solved by compounding a water reducing agent and an inhibitor and combining the water reducing agent and a synthetic anti-soil water reducing agent. Considering the factors such as construction process, cost performance and the like, the solution of the adsorption problem of the soil to the water reducing agent still needs a breakthrough in the aspects of basic theory and application technology.
Through the above analysis, the problems and defects of the prior art are as follows: the prior art does not have a related method for adjusting and determining the concrete proportion based on the adsorption characteristic of sand aggregate to the polycarboxylate superplasticizer.
The difficulty in solving the above problems and defects is: the sandstone aggregate is difficult to adsorb and test the polycarboxylate superplasticizer, the rule is complex and difficult to summarize, and a plurality of difficulties exist in practice.
The significance of solving the problems and the defects is as follows: the adsorption characteristics of the sandstone aggregate to the polycarboxylate superplasticizer are summarized and used for determining the proportion of the anti-mud concrete, and the realization of high cost performance and high-quality concrete targets in the building industry is facilitated.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for determining the proportion of anti-mud concrete.
The invention is realized in such a way that a method for determining the proportion of the mud-resistant concrete comprises the following steps:
and detecting the adsorption capacity of different sandstone aggregates on the polycarboxylate superplasticizer, determining the chain length, the branched chain length, the pH value, the environmental salinity and the adsorption characteristics of salt types of the polycarboxylate superplasticizer, and determining the optimal concrete formula.
Further, the step of detecting the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent comprises the following steps:
and (3) measuring the adsorption capacity of the clay minerals on the polycarboxylic acid water reducing agent by adopting an ultraviolet-visible spectrophotometry, and verifying, supplementing and correcting the ultraviolet-visible spectrophotometry by adopting a total organic carbon testing method.
Further, the detection of the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent further comprises:
judging the type of the characteristic functional group in the clay mineral according to the position of a stretching vibration peak in an infrared spectrogram, and analyzing the change of the characteristic functional group of the montmorillonite structure before and after the treatment of the polycarboxylate superplasticizer; and analyzing the change of the interlayer spacing of the montmorillonite structure before and after the polycarboxylate superplasticizer is treated by utilizing an X-ray diffraction experiment.
Further, the method for determining the proportion of the anti-mud concrete comprises the following steps:
detecting the mud content of different sandstone aggregates, and quantitatively analyzing the contents of montmorillonite, kaolin and illite which are main clay minerals; determining various characteristic parameters of different sandstone aggregates;
determining the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent;
and step three, adjusting and determining the optimal concrete formula based on the adsorption capacity of different sandstone aggregates to the polycarboxylate superplasticizer.
Further, the various characteristic parameters of the sandstone aggregate comprise: the method comprises the following steps of analyzing data such as particle grading, fineness modulus, stone powder content, MB value, mud block content, saturated surface dry water absorption, crushing index, apparent density, bulk density, void ratio and the like, and analyzing the relation between the test result of the index and the stone powder content.
Further, the step of detecting the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent comprises the following steps:
(1) analyzing the adsorption performance of the sandstone aggregate;
(2) determining the adsorption characteristics of the sandstone aggregate to different polycarboxylic acid water reducing agents;
(3) determining the adsorption characteristics of different sandstone aggregates on the same polycarboxylate superplasticizer;
(4) and analyzing the adsorption characteristics of the sandstone aggregate to the polycarboxylic acid water reducing agent under different conditions.
Further, the analyzing the adsorption performance of the sandstone aggregate comprises the following steps: and analyzing the chemical components, specific surface area and morphology of the sandstone aggregate by adopting XRD, BET, BJH and other methods.
Further, the determining of the adsorption characteristics of the sandstone aggregate on different polycarboxylic acid water reducing agents comprises the following steps: the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent with different main chain or branch chain lengths is determined by adopting a method for measuring the oil absorption value of silicate and combining the characteristics of the sandstone aggregates.
Further, the determining of the adsorption characteristics of different sandstone aggregates on the same polycarboxylate superplasticizer comprises the following steps: and determining the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent by combining the characteristics of the sandstone aggregates through a cement paste experiment.
Further, the analysis of the adsorption characteristics of the sandstone aggregate on the polycarboxylate superplasticizer under different conditions comprises the following steps: the method for measuring the oil absorption value of the silicate is adopted, the PH value and the salt type are changed, and the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent is determined.
By combining all the technical schemes, the invention has the advantages and positive effects that: the existing clay mineral components in the sandstone aggregate are quantitatively analyzed, various characteristic parameters of the sandstone aggregate are measured, and the adsorption capacity of the sandstone aggregate to the polycarboxylate superplasticizer under the conditions of change of the length of the main chain and the side chain of the polycarboxylate superplasticizer, pH value, salt doping and the like is detected. On the basis of the self characteristics of the sandstone aggregate and the characteristics of the sandstone aggregate absorbing the polycarboxylate superplasticizer, the proportion of the anti-mud concrete is adjusted and determined. In the process, an ultraviolet-visible spectrophotometry organic carbon test method and an infrared and X-ray diffraction method are combined for the adsorption quantity test, and the accuracy is more excellent.
The method has the advantages that the characteristics of the sandstone aggregate and the characteristics of the polycarboxylate superplasticizer adsorbed by the sandstone aggregate are considered in a combined manner and then are used for adjusting the concrete proportion, so that the adsorption theory and the research result of the polycarboxylate superplasticizer are better applied to the actual production; the invention researches the influence of different influence factors on the proportion of the anti-cement concrete from internal factors (the self characteristics of the sand aggregate and the clay mineral components) and external factors (the type, the pH value and the salts of the polycarboxylic acid water reducing agent). When the adsorption theory and research results of the polycarboxylate superplasticizer are applied to production practice, the determination of the adsorption characteristics of the sandstone aggregate to the polycarboxylate superplasticizer has important theoretical significance and practical application value for adjusting and determining the optimal concrete formula, researching a mud-resistant way and measure with high cost performance, and ensuring the workability of fresh concrete, slump retention capacity and the strength and durability of concrete.
Drawings
Fig. 1 is a flow chart of a method for determining a proportion of anti-mud concrete according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a method for determining a proportion of anti-mud concrete according to an embodiment of the present invention.
FIG. 3 is a schematic diagram showing the relationship between fineness modulus and stone dust content provided by the embodiment of the invention.
FIG. 4 is a schematic diagram showing the relationship between MB value and stone dust content according to an embodiment of the present invention.
FIG. 5 is a schematic diagram showing the relationship between the fluidity of the cement paste and the content of montmorillonite, according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of the adsorption of different polycarboxylic acid water reducing agents in various areas of Guizhou province according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of the adsorption of polycarboxylic acid water reducing agent under different pH conditions in various regions of Guizhou province, which is provided 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 further described in detail with reference to the following 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.
In view of the problems of the prior art, the present invention provides a method for determining the proportion of anti-mud concrete, and the present invention is described in detail below with reference to the accompanying drawings.
The method for determining the proportion of the anti-mud concrete provided by the embodiment of the invention comprises the following steps:
and detecting the adsorption capacity of different sandstone aggregates on the polycarboxylate superplasticizer, determining the chain length, the branched chain length, the pH value, the environmental salinity and the adsorption characteristics of salt types of the polycarboxylate superplasticizer, and determining the optimal concrete formula.
The method for detecting the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent comprises the following steps:
and (3) measuring the adsorption capacity of the clay minerals on the polycarboxylic acid water reducing agent by adopting an ultraviolet-visible spectrophotometry, and verifying, supplementing and correcting the ultraviolet-visible spectrophotometry by adopting a total organic carbon testing method.
The method for detecting the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent provided by the embodiment of the invention further comprises the following steps:
judging the type of the characteristic functional group in the clay mineral according to the position of a stretching vibration peak in an infrared spectrogram, and analyzing the change of the characteristic functional group of the montmorillonite structure before and after the treatment of the polycarboxylate superplasticizer; and analyzing the change of the interlayer spacing of the montmorillonite structure before and after the polycarboxylate superplasticizer is treated by utilizing an X-ray diffraction experiment.
As shown in fig. 1, the method for determining the proportion of the anti-mud concrete provided by the embodiment of the invention comprises the following steps:
s101, detecting the mud content of different sandstone aggregates, and quantitatively analyzing the contents of montmorillonite, kaolin and illite which are main clay minerals; determining various characteristic parameters of different sandstone aggregates;
s102, determining the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent;
s103, adjusting and determining an optimal concrete formula based on the adsorption capacity of different sandstone aggregates to the polycarboxylate superplasticizer.
The sandstone aggregate provided by the embodiment of the invention comprises the following various characteristic parameters: the method comprises the following steps of analyzing data such as particle grading, fineness modulus, stone powder content, MB value, mud block content, saturated surface dry water absorption, crushing index, apparent density, bulk density, void ratio and the like, and analyzing the relation between the test result of the index and the stone powder content.
The method for detecting the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent comprises the following steps:
(1) carrying out sandstone aggregate adsorption performance analysis: and analyzing the chemical components, specific surface area and morphology of the sandstone aggregate by adopting XRD, BET, BJH and other methods.
(2) Determining the adsorption characteristics of the sandstone aggregate to different polycarboxylic acid water reducing agents: the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent with different main chain or branch chain lengths is determined by adopting a method for measuring the oil absorption value of silicate and combining the characteristics of the sandstone aggregates.
(3) Determining the adsorption characteristics of different sandstone aggregates on the same polycarboxylate superplasticizer: and determining the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent by combining the characteristics of the sandstone aggregates through a cement paste experiment.
(4) Analyzing the adsorption characteristics of the sandstone aggregate to the polycarboxylate superplasticizer under different conditions: the method for measuring the oil absorption value of the silicate is adopted, the PH value and the salt type are changed, and the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent is determined.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1:
first, goal, content and expected outcome
The target is as follows: the method comprises the steps of detecting the adsorption capacity of representative sandstone aggregates in different regions of Guizhou province on the existing polycarboxylate superplasticizer of a company, researching the chain length and the branch chain length of the polycarboxylate superplasticizer, the pH value, the environmental salinity and the salt type of the polycarboxylate superplasticizer on the adsorption characteristics of the existing polycarboxylate superplasticizer of the company, and providing a mud-resistant way and a measure for adjusting and determining the optimal concrete formula and researching the high cost performance.
The content is as follows:
1. detecting the mud content of representative sandstone aggregates in different regions of Guizhou province, and quantitatively analyzing the content of montmorillonite, kaolin and illite which are main clay minerals;
2. detecting the adsorption capacity of the sand aggregates to the existing polycarboxylic acid water reducing agent of the company;
3. researching the adsorption characteristics of the sandstone aggregate on the existing polycarboxylate superplasticizer of a company under the conditions of the chain length, the branch length, the pH value, the environmental salinity, the salt type and the like of the polycarboxylate superplasticizer;
4. provides adjustment and determination of the optimal concrete formula and researches the anti-mud way and measure with high cost performance.
Expected results are as follows:
1. establishing a database of the compositions of a plurality of representative sandstone aggregates in different regions of Guizhou province and the adsorption capacity of the existing polycarboxylic acid water reducing agent of a company;
2. finding the adsorption characteristics of the chain length, the length of a branched chain, the PH value, the environmental salinity and the salt type of the polycarboxylate superplasticizer on the existing polycarboxylate superplasticizer of a company, namely main influencing factors and regulation and control means;
3. providing a thought and a method for solving the problem of adsorption of the soil on the water reducing agent, and carrying out a preliminary test;
4. the patent application of the national invention patent 1, published academic paper 1.
The key problems to be solved, the research method, the technical route and the feasibility analysis to be adopted, and the main innovation points.
The key problems to be solved are as follows: accurately measuring the mud content of the sand aggregates and the contents of montmorillonite, kaolin and illite which are main clay minerals; accurately measuring the adsorption capacity of the sandstone aggregate to the polycarboxylic acid water reducing agent; the main influencing factors, rules and regulation and control means of the absorption of the existing polycarboxylate superplasticizers of companies are provided with a plurality of sandstone aggregates.
The study methods to be taken: mainly adopting an ultraviolet-visible spectrophotometry to measure the adsorption capacity of the clay minerals on the polycarboxylic acid water reducing agent, and adopting a total organic carbon test method (TOC test method) to verify, supplement and correct the ultraviolet-visible spectrophotometry; judging the type of the characteristic functional group in the clay mineral according to the position of a stretching vibration peak in an infrared spectrogram, and analyzing the change of the characteristic functional group of the montmorillonite structure before and after the treatment of the polycarboxylate superplasticizer; and analyzing the change of the interlayer spacing of the montmorillonite structure before and after the polycarboxylate superplasticizer is treated by utilizing an X-ray diffraction experiment.
Feasibility analysis: the adsorption mechanism, the adsorption form and the mud resistance mechanism and means of the clay in the concrete sandstone aggregate on the polycarboxylate superplasticizer are mature, and the related research ideas and detection means are mature and have high feasibility.
The steps of optimizing the adsorption measurement condition, testing the repeatability of the absorbance and the like are required before the measurement by the ultraviolet spectrophotometry, compared with the TOC process, the ultraviolet-visible spectrophotometry has the advantages of relatively small error, high sensitivity, lower limit of the measured concentration of 10 < -5 > mol/L-10 < -6 > mol/L and lower cost than the TOC. In combination with the above analysis, the present invention mainly adopts an ultraviolet-visible spectrophotometry to determine the adsorption amount of the clay minerals to the polycarboxylate superplasticizer, and adopts a total organic carbon test method (TOC test method) to verify, supplement and correct the ultraviolet-visible spectrophotometry.
The main innovation points are as follows: the sensitivity and the action mechanism of the polycarboxylate superplasticizer (PC) to the mud in the sand are one of the hot points of concrete technical research in recent years, the adsorption mechanism, the adsorption form, the mud-resistant mechanism and means of the clay in the concrete gravel aggregate to the polycarboxylate superplasticizer are mature, but the factors such as the construction process, the cost performance and the like are considered, and the breakthrough in the aspects of basic theory and application technology is needed for solving the adsorption problem of the mud to the water reducer.
Therefore, the main innovation point of the invention is to solve the practical production problem, and try to comprehensively apply multiple theoretical knowledge through systematic and accurate research, and provide a thought and a way for breaking through a scientific and technical problem.
Example 2:
research on adsorption characteristics of sandstone aggregates in Guiyang areas of Guizhou province on polycarboxylate superplasticizers (taking the sandstone aggregates in Guiyang areas as an example)
1) Research on characteristics of sandstone aggregates:
taking sandstone aggregate in Guiyang areas as an example:
carrying out conventional technical index test on the sandstone aggregate in the Guiyang area, measuring data such as particle composition, fineness modulus, stone powder content, MB value, mud block content, saturated surface dry water absorption, crushing index, apparent density, bulk density, void ratio and the like, and analyzing the relation between the test result and the proportion of the anti-mud concrete;
TABLE 1 characteristic data of sandstone aggregate in Guiyang region
2) The research on the adsorption characteristics of the sandstone aggregate in the Guiyang area on the existing polycarboxylic acid water reducing agent of Kejie company,
(1) analyzing the adsorption performance of the sandstone aggregate: analyzing the chemical components, specific surface area and morphology of the sandstone aggregate by adopting test methods such as XRD, BET, BJH and the like;
a) XRD component analysis and test:
TABLE 2 chemical composition of sandstone aggregate in Guiyang area
b) BET and BJH tests:
TABLE 3 BET and BJH data of sandstone aggregate in Guiyang region
(2) The adsorption characteristics of the sandstone aggregate to different polycarboxylic acid water reducing agents are as follows:
by adopting a method for measuring the oil absorption value of silicate and combining the characteristics of the sandstone aggregate, the adsorption of the sandstone aggregate in various regions of Guizhou on polycarboxylic acid water reducing agents with different main chain or branch chain lengths is researched;
TABLE 3 adsorption of sandstone aggregates in Guiyang areas on polycarboxylate superplasticizers with different main chains
TABLE 4 adsorption of sandstone aggregate in Guiyang area on polycarboxylate superplasticizers with different side chains
(3) The adsorption characteristics of different sandstone aggregates on the same polycarboxylate superplasticizer are as follows:
the comprehensive analysis is carried out on the test result of the adsorption of the same polycarboxylate superplasticizer by the sandstone aggregates in various regions.
TABLE 5 adsorption of sandstone aggregates from various regions of Guizhou province on the same polycarboxylate superplasticizer (C059)
(4) Under different conditions, the sandstone aggregate has the adsorption characteristic on the polycarboxylate superplasticizer:
by adopting a method for measuring the oil absorption value of silicate, the pH value and the salt type are changed, and the adsorption of sandstone aggregates in various regions of Guizhou on the polycarboxylic acid water reducer is researched;
TABLE 8 adsorption of the sandstone aggregates in Guiyang areas to the polycarboxylate superplasticizer under different pH conditions
| Region(s) | pH value | Aggregate quality (g) of sandstone | Amount of addition (g) | Absorption value (g/100g) |
| Guiyang tea | pH＝1 | 5.015 | 1.760 | 35.1 |
| Guiyang tea | pH＝11 | 4.981 | 1.669 | 33.5 |
TABLE 9 adsorption of the sandstone aggregates in Guiyang areas to the polycarboxylate superplasticizer under different salt conditions
3) And through the adsorption rule of the sandstone aggregate to the polycarboxylic acid water reducing agent, the optimal concrete formula is adjusted and determined, and the anti-mud way and measure with high cost performance are explored.
(1) As for the sandstone aggregate in the Guiyang area, the MB value is in the range of 0.5-1.0, the powder content is controlled in the range of 13-18%, and the prepared concrete has low mixing amount of the water reducing agent, good working performance of the concrete and stable strength; the sand aggregate of the gravels in the Guiyang area is coarse, and the sand-concrete rate of the ready-mixed machine-made sand is increased by 5 to 10 percent compared with the sand rate of the natural sand-concrete; the characteristic indexes of the sandstone aggregate in the Guiyang area are as follows: the bulk density, the apparent density, the void ratio, the crushing value index, the mud block content, the saturated surface dry water absorption, the light material content, the sulfide and sulfate content and the organic matter content basically accord with the national standard regulation;
(2) the sandstone aggregate in the Guiyang region contains a small amount of montmorillonite, kaolinite, mica and other minerals which have large adsorption on the polycarboxylic acid water reducing agent, and according to detection and analysis, the sandstone aggregate in the region has large adsorption capacity on the polycarboxylic acid water reducing agent; the cement paste prepared from the sandstone aggregates with higher contents of montmorillonite and kaolinite easily causes the problems of high fluidity loss of the paste and the like, and the existence of the montmorillonite and the kaolinite provides internal conditions for the adsorption of machine-made sand;
(4) according to experimental data of measuring the adsorption capacity of the sandstone aggregate in the Guiyang region to the polycarboxylic acid water reducing agent with different main chain or branch chain lengths, the adsorption capacity of the sandstone aggregate to the polycarboxylic acid water reducing agent is related to the main chain length and the branch chain length of the polycarboxylic acid water reducing agent, and the chain length of the polycarboxylic acid water reducing agent can be properly adjusted under the condition that the working performance of the cement-resistant concrete is not affected when the cement-resistant concrete is prepared;
(5) according to experimental data of measuring the adsorption capacity of the machine-made sand in the Guiyang area to the polycarboxylate superplasticizer at different pH values, the polycarboxylate superplasticizer molecules adsorbed by the machine-made sand at a lower pH value are far larger than the polycarboxylate superplasticizer molecules adsorbed at a higher pH value; and a certain amount of phosphogypsum is doped, so that the adsorption of machine-made sand on the polycarboxylate superplasticizer molecules is reduced.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of determining a proportion of mud resistant concrete, the method comprising: and detecting the adsorption capacity of different sandstone aggregates on the polycarboxylate superplasticizer, determining the chain length, the branched chain length, the pH value, the environmental salinity and the adsorption characteristics of salt types of the polycarboxylate superplasticizer, and determining the optimal concrete formula.
2. The method for determining the proportion of the mud-resistant concrete according to claim 1, wherein the step of detecting the adsorption amount of the polycarboxylic acid water reducer by different sand aggregates comprises the following steps:
and (3) measuring the adsorption capacity of the clay minerals on the polycarboxylic acid water reducing agent by adopting an ultraviolet-visible spectrophotometry, and verifying, supplementing and correcting the ultraviolet-visible spectrophotometry by adopting a total organic carbon testing method.
3. The method for determining the proportion of the mud-resistant concrete according to claim 1, wherein the step of detecting the adsorption amount of the polycarboxylic acid water reducer by different sand aggregates further comprises the following steps:
judging the type of the characteristic functional group in the clay mineral according to the position of a stretching vibration peak in an infrared spectrogram, and analyzing the change of the characteristic functional group of the montmorillonite structure before and after the treatment of the polycarboxylate superplasticizer; and analyzing the change of the interlayer spacing of the montmorillonite structure before and after the polycarboxylate superplasticizer is treated by utilizing an X-ray diffraction experiment.
4. The method of determining a mud-resistant concrete ratio of claim 1 wherein the method of determining a mud-resistant concrete ratio comprises the steps of:
detecting mud content of different sandstone aggregates, and quantitatively analyzing the contents of montmorillonite, kaolin and illite which are main clay minerals; determining various characteristic parameters of different sandstone aggregates;
determining the adsorption capacity of different sandstone aggregates on the polycarboxylic acid water reducing agent;
and step three, adjusting and determining the optimal concrete formula based on the adsorption capacity of different sandstone aggregates to the polycarboxylate superplasticizer.
5. The method of determining the proportion of mud-resistant concrete according to claim 4, wherein the types of characteristic parameters of the sand aggregate include: the method comprises the following steps of analyzing data such as particle grading, fineness modulus, stone powder content, MB value, mud block content, saturated surface dry water absorption, crushing index, apparent density, bulk density, void ratio and the like, and analyzing the relation between the test result of the index and the stone powder content.
6. The method for determining the proportion of the mud-resistant concrete according to claim 4, wherein the step of detecting the adsorption amount of the polycarboxylic acid water reducer by different sand aggregates comprises the following steps:
(1) analyzing the adsorption performance of the sandstone aggregate;
(2) determining the adsorption characteristics of the sandstone aggregate to different polycarboxylic acid water reducing agents;
(3) determining the adsorption characteristics of different sandstone aggregates on the same polycarboxylate superplasticizer;
(4) and analyzing the adsorption characteristics of the sandstone aggregate to the polycarboxylic acid water reducing agent under different conditions.
7. The method of determining a proportion of mud-resistant concrete according to claim 6, wherein performing a sand aggregate adsorption performance analysis comprises: and analyzing the chemical components, specific surface area and morphology of the sandstone aggregate by adopting XRD, BET, BJH and other methods.
8. The method of determining a mud-resistant concrete ratio of claim 6 wherein determining the adsorption characteristics of sand aggregate to different polycarboxylic acid water reducing agents comprises: the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent with different main chain or branch chain lengths is determined by adopting a method for measuring the oil absorption value of silicate and combining the characteristics of the sandstone aggregates.
9. The method of determining the mud-resistant concrete ratio of claim 6 wherein determining the adsorption characteristics of different sand aggregates to the same polycarboxylate water reducer comprises: and determining the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent by combining the characteristics of the sandstone aggregates through a cement paste experiment.
10. The method of determining the proportion of mud-resistant concrete of claim 6, wherein said analyzing the adsorption characteristics of the sand aggregate to the polycarboxylic acid water reducer under different conditions comprises: the method for measuring the oil absorption value of the silicate is adopted, the PH value and the salt type are changed, and the adsorption of different sandstone aggregates on the polycarboxylic acid water reducing agent is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640610.2A CN115073034A (en) | 2022-06-08 | 2022-06-08 | Method for determining proportion of anti-mud concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640610.2A CN115073034A (en) | 2022-06-08 | 2022-06-08 | Method for determining proportion of anti-mud concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115073034A true CN115073034A (en) | 2022-09-20 |
Family
ID=83252189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210640610.2A Pending CN115073034A (en) | 2022-06-08 | 2022-06-08 | Method for determining proportion of anti-mud concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115073034A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107140866A (en) * | 2017-05-31 | 2017-09-08 | 徐州铸建建材科技有限公司 | A kind of pervasive anti-chamotte mould polycarboxylate water-reducer and preparation method thereof |
| CN107698715A (en) * | 2017-07-06 | 2018-02-16 | 徐州巨龙新材料科技有限公司 | A kind of anti-mud polycarboxylate water-reducer |
| CN108872115A (en) * | 2018-07-30 | 2018-11-23 | 宁波工程学院 | UV derivative spectrum quantitative analysis method of the mountain flour to polycarboxylate water-reducer adsorbance |
| CN109593166A (en) * | 2018-11-28 | 2019-04-09 | 河南科之杰新材料有限公司 | A kind of anti-mud polycarboxylate water-reducer and preparation method thereof |
| CN110563891A (en) * | 2019-08-27 | 2019-12-13 | 河南科之杰新材料有限公司 | Polycarboxylate superplasticizer with mud resistance and viscosity reduction functions and preparation method thereof |
| CN111777722A (en) * | 2020-07-30 | 2020-10-16 | 中建西部建设新疆有限公司 | Anti-mud slump-retaining polycarboxylate superplasticizer and preparation method thereof |
-
2022
- 2022-06-08 CN CN202210640610.2A patent/CN115073034A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107140866A (en) * | 2017-05-31 | 2017-09-08 | 徐州铸建建材科技有限公司 | A kind of pervasive anti-chamotte mould polycarboxylate water-reducer and preparation method thereof |
| CN107698715A (en) * | 2017-07-06 | 2018-02-16 | 徐州巨龙新材料科技有限公司 | A kind of anti-mud polycarboxylate water-reducer |
| CN108872115A (en) * | 2018-07-30 | 2018-11-23 | 宁波工程学院 | UV derivative spectrum quantitative analysis method of the mountain flour to polycarboxylate water-reducer adsorbance |
| CN109593166A (en) * | 2018-11-28 | 2019-04-09 | 河南科之杰新材料有限公司 | A kind of anti-mud polycarboxylate water-reducer and preparation method thereof |
| CN110563891A (en) * | 2019-08-27 | 2019-12-13 | 河南科之杰新材料有限公司 | Polycarboxylate superplasticizer with mud resistance and viscosity reduction functions and preparation method thereof |
| CN111777722A (en) * | 2020-07-30 | 2020-10-16 | 中建西部建设新疆有限公司 | Anti-mud slump-retaining polycarboxylate superplasticizer and preparation method thereof |
Non-Patent Citations (6)
| Title |
|---|
| 李悦等: "《抗泥型聚羧酸减水剂的研究进展》", 《混凝土》 * |
| 李悦等: "《抗泥型聚羧酸减水剂的研究进展》", 《混凝土》, no. 11, 30 November 2020 (2020-11-30), pages 48 - 51 * |
| 李烜东: "《聚羧酸的分子设计与功能研究进展》", 《广州化工》 * |
| 李烜东: "《聚羧酸的分子设计与功能研究进展》", 《广州化工》, vol. 49, no. 4, 31 December 2021 (2021-12-31), pages 25 - 28 * |
| 马保国等: "《水泥和黏土矿物对不同减水剂的吸附特性》", 《硅酸盐学报》 * |
| 马保国等: "《水泥和黏土矿物对不同减水剂的吸附特性》", 《硅酸盐学报》, vol. 41, no. 3, 31 December 2013 (2013-12-31), pages 328 - 333 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sahdeo et al. | Effect of mix proportion on the structural and functional properties of pervious concrete paving mixtures | |
| Chen et al. | Utilization of barium slag to improve chloride-binding ability of cement-based material | |
| Tsivilis et al. | An analysis of the properties of Portland limestone cements and concrete | |
| Kafi et al. | Microstructural characterization and mechanical properties of cementitious mortar containing montmorillonite nanoparticles | |
| Gong et al. | Water resistance and a comprehensive evaluation model of magnesium oxychloride cement concrete based on Taguchi and entropy weight method | |
| Gao et al. | Effects of different mineral admixtures on carbonation resistance of lightweight aggregate concrete | |
| Kirthika et al. | Effect of clay in alternative fine aggregates on performance of concrete | |
| CN103435306A (en) | Low-shrinkage crack self-compacting concrete | |
| Chi et al. | Investigation of the hydration properties of cement with EDTA by alternative current impedance spectroscopy | |
| CN105174854A (en) | Powder concrete with ceramic polishing powder | |
| Hu et al. | Microscopic characteristics of the action of an air entraining agent on cemented paste backfill pores | |
| Jin et al. | Iodide and chloride ions diffusivity, pore characterization and microstructures of concrete incorporating ground granulated blast furnace slag | |
| Yuan et al. | Investigating the pollutant-removal performance and DOM characteristics of rainfall surface runoff during different ecological concrete revetments treatment | |
| Zhang et al. | Surface relaxation and permeability of cement pastes with hydrophobic agent: Combining 1H NMR and BET | |
| Chintalapudi et al. | Enhanced chemical resistance to sulphuric acid attack by reinforcing Graphene Oxide in Ordinary and Portland Pozzolana cement mortars | |
| Yaraghi et al. | Evaluation of test procedures for durability and permeability assessment of concretes containing calcined clay | |
| Buari et al. | Short term durability study of groundnut shell ash blended self consolidating high performance concrete in sulphate and acid environments | |
| Zhang et al. | Effects of sticky rice addition on the properties of lime-tile dust mortars | |
| Liu et al. | Effect of modifiers on crystalizing habit and mechanical strength of α-hemihydrate gypsum prepared from PG by an autoclaved method | |
| Marik et al. | Investigation on use of silica based additive for sustainable subgrade construction | |
| Jiang et al. | Preparation of controlled low-strength materials from alkali-excited red mud-slag-iron tailings sand and a study of the reaction mechanism | |
| CN115073034A (en) | Method for determining proportion of anti-mud concrete | |
| Wu et al. | Purification of runoff pollution using porous asphalt concrete incorporating zeolite powder | |
| Olonade et al. | Performance evaluation of concrete made with sands from selected locations in Osun State, Nigeria | |
| Mukhopadhyay et al. | An innovative approach to fly ash characterization and evaluation to prevent alkali-silica reaction |
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 |
Application publication date: 20220920 |
|
| RJ01 | Rejection of invention patent application after publication |