CN110759657A - Method for reinforcing recycled aggregate and improving bonding of recycled aggregate and mortar - Google Patents
Method for reinforcing recycled aggregate and improving bonding of recycled aggregate and mortar Download PDFInfo
- Publication number
- CN110759657A CN110759657A CN201911154468.5A CN201911154468A CN110759657A CN 110759657 A CN110759657 A CN 110759657A CN 201911154468 A CN201911154468 A CN 201911154468A CN 110759657 A CN110759657 A CN 110759657A
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- China
- Prior art keywords
- aggregate
- recycled
- dispersion liquid
- mortar
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title claims description 8
- 239000004567 concrete Substances 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000006185 dispersion Substances 0.000 claims abstract description 19
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 12
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 12
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 12
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 12
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 11
- 238000012986 modification Methods 0.000 claims abstract description 10
- 230000004048 modification Effects 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000005728 strengthening Methods 0.000 abstract description 4
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
A method for strengthening recycled aggregate and improving the bonding between the recycled aggregate and mortar belongs to the technical field of comprehensive utilization of building wastes and production of building materials, and particularly relates to a method for strengthening the bonding between recycled aggregate concrete and mortar. The method adopts nano SiO2The dispersion liquid is used for carrying out surface modification on the recycled concrete aggregate. The method mainly adopts physical adsorption and sedimentation methods in the aggregate modification process, and adopts a small amount of nano silicon dioxide to settle the aggregate, so that the method has the advantages of better promotion, simpler and more convenient operation compared with other methods, and cost saving.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of building wastes and production of building materials, and particularly relates to a method for enhancing bonding of recycled aggregate concrete and mortar.
Technical Field
With the development of economy in China and the acceleration of urbanization process, the quantity of construction projects all over the country is continuously increased, and the consumption of concrete is increased rapidly. This current situation directly leads to coarse aggregate becoming a scarce resource in our country. In the process of urbanization, a large number of concrete buildings are dismantled to generate a lot of construction wastes, and the construction wastes are generally treated in an open-air stacking or landfill mode, so that secondary pollution is easily caused. The use of the recycled concrete not only meets the requirement of coarse aggregate, but also prevents secondary pollution caused by stacking of construction waste. Compared with natural aggregate, the recycled concrete has a lot of defects, such as poor surface adhesion performance, more cracks, poor appearance condition, large void ratio and poor water absorption performance, so that the prepared concrete has relatively poor mechanical property and durability. Therefore, solving the performance defect of the recycled concrete aggregate is of great significance to the development, popularization and application of the recycled concrete aggregate.
The existing solution is a physical and chemical method, wherein the physical method is to strengthen and modify the aggregate, and the mechanical grinding, the heating grinding, the selective heating grinding and other methods are adopted to remove the mortar attached to the recycled aggregate, reduce the cracks and shape the aggregate. Old mortar on the recycled aggregate is removed by a microwave circulation method, so that the quality of the recycled aggregate is improved. The chemical method is to modify the recycled aggregate by adopting sodium silicate and silane solution to form a hydrophobic film on the surface of the aggregate. Some of the prior silicon dioxide dispersion liquids adopt high-concentration nano silicon dioxide dispersion liquids to directly carry out chemical modification on aggregates to enhance the performance of the aggregates, but the prior silicon dioxide dispersion liquids are added with various chemical additives such as acid, alkali and the like, the concentration is up to 30 percent, the modification cost is higher, and the prior silicon dioxide dispersion liquids are not suitable for large-scale production and application.
Disclosure of Invention
The invention provides a treatment method of recycled aggregate, which adopts a physical method to enhance the bonding force with mortar, so that the strength of recycled concrete prepared from the recycled aggregate is improved.
A method for reinforcing regenerated aggregate and improving its adhesion with mortar uses nano SiO2The method for carrying out surface modification on the recycled concrete aggregate is characterized by comprising the following specific steps:
S1，SiO2preparation of dispersion liquid: using SiO 15-25nm2The powder is prepared into nano silicon dioxide dispersion liquid with the weight concentration of 0.5-1.5%;
s2, weighing continuous particle size fraction recycled coarse aggregate with the particle size of 4.75-19mm into the dispersion liquid, stirring, soaking, taking out, drying, and adding 1.4-2kg recycled coarse aggregate into each liter of the dispersion liquid;
wherein, the soaking time is selected according to the concentration of the nano silicon dioxide dispersion liquid, and specifically comprises the following steps: the concentration of the dispersion liquid is more than or equal to 0.5 percent and less than 1 percent, and the soaking time is 2-6 h; or the concentration of the dispersion liquid is more than or equal to 1 percent and less than 1.5 percent, and the soaking time is 2-4 h; or the concentration of the dispersion liquid is 1.5 percent, and the soaking time is 2 hours.
The principle of the invention is that nano silicon dioxide particles are fully dispersed in a solution through oscillation to form nano silicon dioxide dispersion liquid, then the nano silicon dioxide is adsorbed and precipitated in the opening pores and microcracks of the recycled aggregate in the standing process, nano-scale and micron-scale silicon dioxide precipitation layers are formed on the surface of the recycled aggregate, and the nano particles penetrating into the opening pores of the recycled aggregate and the precipitation layers formed on the surface of the recycled aggregate are utilized to absorb calcium hydroxide enriched on the surface of the recycled aggregate and in the pores together, wherein the calcium hydroxide is formed in the strength development process of the recycled aggregate concrete. Through hydration, liquid phase or solid phase reaction, a gel with higher strength is generated, and the interface bonding strength between the recycled aggregate and the set cement is improved to realize the in-situ reinforcement of the recycled aggregate, so that the strength and the durability of the recycled aggregate concrete are improved.
However, a threshold value exists for improving the strength of the recycled aggregate by the nano-silica physical precipitation layer, due to the adoption of a physical precipitation method, the nano-silica is loose on the surface of the aggregate and cannot form a stable structure layer, a stable bonding layer can be formed only by reaction with cement after stirring is completed, if the precipitation layer is too thick, part of the silica cannot participate in the reaction to form an isolation layer, and the aggregate mortar is separated, so that the strength of the concrete is reduced in a collapse mode. Therefore, it is required to ensure the precipitation effect by controlling the soaking time of the aggregate and the concentration of the soaking solution.
According to the invention, the aggregate modification process mainly adopts physical adsorption and sedimentation methods, and a small amount of nano silicon dioxide is adopted to carry out sedimentation on the aggregate, so that the improvement is better, the operation is simpler and more convenient than other methods, and the cost is saved.
Detailed Description
Example 1: a method for reinforcing regenerated aggregate and improving its adhesion with mortar mainly uses nano SiO2And carrying out surface modification on the recycled concrete aggregate. The method comprises the following specific steps:
S1，SiO2preparation of dispersion liquid: respectively weighing 7g, 14g and 21g of nano SiO2Powder with particle diameter of 15-25nm, placing into beaker, addingWater to 1.4L-2L, and ultrasonic vibrating at 50Hz intensity and 100% for 30 minutes to prepare nano silicon dioxide dispersion liquid with weight concentration of 0.5%, 1% and 1.5%.
S2, weighing three parts of 2.3kg of continuous-grade recycled coarse aggregate with the particle size of 4.75-19mm, respectively pouring the three parts into the three-concentration solution of S1, respectively soaking for 2h after stirring, and then taking out and drying.
S3, preparing the dried aggregate into a concrete test block by adopting national standard, wherein the test block is prepared from the following components in parts by weight: cement: sand: coarse aggregate was 0.45:1:1.36: 2.11.
After the concrete is stirred, the concrete is placed into a 70X 70mm mould and placed on a vibration table, the vibration table is vibrated for 60 seconds at 30Hz, the mould is removed after the concrete is sealed and stored for 24 hours, the concrete is placed into a curing room for curing, and the compressive strength is measured when the concrete is aged 7d and 28d respectively. The concrete proportion and the test result are shown in the table 1, and the table shows that the 7d strength is improved by 2 to 15.6 percent, and the 28d strength is respectively improved by 6 to 11.4 percent.
TABLE 1
Example 2: a method for strengthening recycled aggregate and improving the bonding between the recycled aggregate and mortar comprises the steps of soaking the recycled aggregate for 4 hours, the other steps are the same as those of example 1, the concrete proportion and the test results are shown in a table 2, the 7d strength is improved by-6.7 to 15 percent, the 28d strength is respectively improved by 1 to 14.8 percent, and the strength of the concrete is greatly reduced due to the fact that the concentration of a soaking solution is 1.5 percent and exceeds a threshold value.
TABLE 2
Example 3: a method for strengthening recycled aggregate and improving the bonding between the recycled aggregate and mortar comprises the steps of soaking the recycled aggregate for 6 hours, the other steps are the same as those of example 1, the concrete proportion and the test results are shown in Table 3, the strength of 7d is improved by-7.8% to 18.9%, the strength of 28d is improved by-13.1% to 10.7, and the strength of concrete is greatly reduced due to the fact that the concentrations of soaking liquid of 1% and 1.5% exceed the threshold value.
TABLE 3
Example 4: a method for reinforcing regenerated aggregate and improving its adhesion with mortar mainly uses nano SiO2And carrying out surface modification on the recycled concrete aggregate. The method comprises the following specific steps:
S1，SiO2preparation of dispersion liquid: weighing 14kg of nano SiO2The powder with the particle size of 15-25nm is put into a reservoir with the capacity of 3000L of 1400L water, and stirred by a stirrer until no obvious precipitate is left at the bottom of the solution, and SiO is generated2The dispersion was uniform, required to achieve the same transmittance as that of the laboratory preparation, and was prepared as a nano-silica dispersion having a concentration of 1% by weight.
S2, weighing 2.3t of continuous-grade recycled coarse aggregate with the particle size of 4.75-19mm, pouring the recycled coarse aggregate into the solution of S1, fully stirring, respectively soaking for 4h, taking out and drying.
S3, preparing the dried aggregate into a concrete test block by adopting national standard, wherein the test block is prepared from the following components in parts by weight: cement: sand: coarse aggregate was 0.45:1:1.36: 2.11.
After the concrete is stirred, paving the prepared concrete into a pavement, vibrating the prepared concrete by using a vibrator until no obvious air bubbles emerge from the surface, then covering the prepared concrete with geotextile, taking out part of the concrete, putting the part of the concrete into a 70 x 70mm mould, putting the mould on a vibrating table, vibrating the mould for 60 seconds at 30Hz without obvious air bubbles emerging, sealing and storing the concrete for 24 hours, then removing the mould, putting the mould beside the pavement, watering and maintaining the mould together with the pavement, and measuring the compressive strength at the age of 7d and 28d respectively. The concrete proportion and the test result are shown in the table 4, and the table shows that the 7d strength is improved by 3.4 percent, and the 28d strength is respectively improved by 10.8 percent.
TABLE 4
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. It will be understood that the invention is not limited to what has been described above and shown in the accompanying tables, and that various modifications and changes can be made without departing from the scope thereof.
Claims (3)
1. A method for reinforcing regenerated aggregate and improving its adhesion with mortar uses nano SiO2The method for carrying out surface modification on the recycled concrete aggregate is characterized by comprising the following specific steps:
S1，SiO2preparation of dispersion liquid: using SiO 15-25nm2The powder is prepared into nano silicon dioxide dispersion liquid with the weight concentration of 0.5-1.5%;
s2, weighing continuous particle size fraction recycled coarse aggregate with the particle size of 4.75-19mm into the dispersion liquid, stirring, soaking, taking out, drying, and adding 1.4-2kg recycled coarse aggregate into each liter of the dispersion liquid;
wherein, the soaking time is selected according to the concentration of the nano silicon dioxide dispersion liquid, and specifically comprises the following steps: the concentration of the dispersion liquid is more than or equal to 0.5 percent and less than 1 percent, and the soaking time is 2-6 h; or the concentration of the dispersion liquid is more than or equal to 1 percent and less than 1.5 percent, and the soaking time is 2-4 h; or the concentration of the dispersion liquid is 1.5 percent, and the soaking time is 2 hours.
2. The method of reinforcing recycled aggregate and improving its bonding to mortar of claim 1, wherein the dispersion is free of significant precipitation, SiO2The dispersion is uniform.
3. The method for reinforcing recycled aggregate and improving the bonding between the recycled aggregate and mortar according to claim 1, wherein the dispersion is homogenized by ultrasonic vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154468.5A CN110759657B (en) | 2019-11-22 | 2019-11-22 | Method for reinforcing recycled aggregate and improving bonding of recycled aggregate and mortar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154468.5A CN110759657B (en) | 2019-11-22 | 2019-11-22 | Method for reinforcing recycled aggregate and improving bonding of recycled aggregate and mortar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110759657A true CN110759657A (en) | 2020-02-07 |
| CN110759657B CN110759657B (en) | 2021-05-28 |
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| CN201911154468.5A Expired - Fee Related CN110759657B (en) | 2019-11-22 | 2019-11-22 | Method for reinforcing recycled aggregate and improving bonding of recycled aggregate and mortar |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111635190A (en) * | 2020-05-20 | 2020-09-08 | 深圳市东大洋建材有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN111704378A (en) * | 2020-06-18 | 2020-09-25 | 扬州大学 | Chemical treatment method of recycled aggregate for asphalt concrete |
| CN111847944A (en) * | 2020-07-23 | 2020-10-30 | 中国建筑科学研究院有限公司 | Ferrochromium slag for concrete aggregate and preparation method thereof |
| CN111892316A (en) * | 2020-07-03 | 2020-11-06 | 广东工业大学 | Recycled aggregate modified by nano-silica and preparation method and application thereof |
| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN115028384A (en) * | 2022-06-08 | 2022-09-09 | 深圳大学 | Surface-pretreated steel slag powder and preparation method and application thereof |
| CN115636612A (en) * | 2022-08-26 | 2023-01-24 | 台州学院 | Method for compounding and strengthening recycled aggregate by using nano dispersion liquid and chemical solution |
| CN116003039A (en) * | 2023-02-27 | 2023-04-25 | 盐城市福奇混凝土有限公司 | Pervious concrete containing modified polypropylene fibers and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111635190A (en) * | 2020-05-20 | 2020-09-08 | 深圳市东大洋建材有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN111635190B (en) * | 2020-05-20 | 2022-01-04 | 深圳市东大洋建材有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN111704378A (en) * | 2020-06-18 | 2020-09-25 | 扬州大学 | Chemical treatment method of recycled aggregate for asphalt concrete |
| CN111704378B (en) * | 2020-06-18 | 2022-05-13 | 扬州大学 | Chemical treatment method of recycled aggregate for asphalt concrete |
| CN111892316A (en) * | 2020-07-03 | 2020-11-06 | 广东工业大学 | Recycled aggregate modified by nano-silica and preparation method and application thereof |
| CN111847944A (en) * | 2020-07-23 | 2020-10-30 | 中国建筑科学研究院有限公司 | Ferrochromium slag for concrete aggregate and preparation method thereof |
| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN113354369B (en) * | 2021-07-23 | 2022-07-12 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN115028384A (en) * | 2022-06-08 | 2022-09-09 | 深圳大学 | Surface-pretreated steel slag powder and preparation method and application thereof |
| CN115636612A (en) * | 2022-08-26 | 2023-01-24 | 台州学院 | Method for compounding and strengthening recycled aggregate by using nano dispersion liquid and chemical solution |
| CN116003039A (en) * | 2023-02-27 | 2023-04-25 | 盐城市福奇混凝土有限公司 | Pervious concrete containing modified polypropylene fibers and preparation method thereof |
| CN116003039B (en) * | 2023-02-27 | 2023-09-19 | 盐城市福奇混凝土有限公司 | Pervious concrete containing modified polypropylene fibers and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN110759657B (en) | 2021-05-28 |
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