CN117865582A - Preparation method of building solid waste recycled sand powder concrete - Google Patents
Preparation method of building solid waste recycled sand powder concrete Download PDFInfo
- Publication number
- CN117865582A CN117865582A CN202410125855.0A CN202410125855A CN117865582A CN 117865582 A CN117865582 A CN 117865582A CN 202410125855 A CN202410125855 A CN 202410125855A CN 117865582 A CN117865582 A CN 117865582A
- Authority
- CN
- China
- Prior art keywords
- sand powder
- solid waste
- zinc
- aluminum
- mixing
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 69
- 239000004576 sand Substances 0.000 title claims abstract description 69
- 239000004567 concrete Substances 0.000 title claims abstract description 55
- 239000002910 solid waste Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 239000012615 aggregate Substances 0.000 claims abstract description 38
- 239000003513 alkali Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000011268 mixed slurry Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims abstract description 3
- 239000008367 deionised water Substances 0.000 claims description 44
- 229910021641 deionized water Inorganic materials 0.000 claims description 44
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 40
- 229960001367 tartaric acid Drugs 0.000 claims description 33
- 235000002906 tartaric acid Nutrition 0.000 claims description 33
- 239000011975 tartaric acid Substances 0.000 claims description 33
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 28
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 24
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 24
- 239000004115 Sodium Silicate Substances 0.000 claims description 22
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 22
- -1 zinc aluminum tartrate Chemical compound 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 17
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 17
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 16
- 235000005074 zinc chloride Nutrition 0.000 claims description 12
- 239000011592 zinc chloride Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- FEWJPZIEWOKRBE-XIXRPRMCSA-N Mesotartaric acid Chemical compound OC(=O)[C@@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-XIXRPRMCSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 229940048879 dl tartaric acid Drugs 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000012190 activator Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 3
- 125000001624 naphthyl group Chemical group 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- WJQZZLQMLJPKQH-UHFFFAOYSA-N 2,4-dichloro-6-methylphenol Chemical compound CC1=CC(Cl)=CC(Cl)=C1O WJQZZLQMLJPKQH-UHFFFAOYSA-N 0.000 description 5
- VRGNUPCISFMPEM-ZVGUSBNCSA-L zinc;(2r,3r)-2,3-dihydroxybutanedioate Chemical compound [Zn+2].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O VRGNUPCISFMPEM-ZVGUSBNCSA-L 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229940095064 tartrate Drugs 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to building solid waste regenerated sand powder concrete and a preparation method thereof, comprising the following steps: step 1, collecting building solid waste materials, and crushing to obtain solid waste sand powder; step 2, performing alkali excitation treatment on the solid waste sand powder under the action of an alkali excitant to obtain regenerated sand powder; step 3, mixing the reclaimed sand powder with cement, aggregate, fly ash, a water reducing agent and water, and uniformly stirring to form mixed slurry; and 4, preparing the regenerated sand powder concrete. The invention processes the construction solid waste material and then uses the construction solid waste material in the preparation of concrete. The method has the advantages that the method can keep the early strength of the concrete high, and overcomes the defect that the traditional alkali excitation treatment is easy to crack.
Description
Technical Field
The invention relates to the field of concrete, in particular to a preparation method of building solid waste recycled sand powder concrete.
Background
Along with the promotion of urban construction, the building rubbish as an accompanying body is continuously increased, the number of waste concrete removed each year is huge, and the accompanying building rubbish is increased.
The construction waste formed by the waste building concrete is crushed to form the recycled concrete for recycling, so that a large amount of construction waste is treated, and the construction material is saved. However, the recycled concrete aggregate obtained by crushing the waste concrete and the waste bricks has too many edges and corners, most of the recycled aggregate is needle-shaped, tiny cracks are generated in the aggregate in the process of crushing the recycled aggregate, and meanwhile, a part of old mortar is adhered to the surface of the recycled aggregate, so that the recycled aggregate has the characteristics of large crushing index, high water absorption rate, large porosity, low apparent density and the like compared with the natural aggregate. The characteristics of recycled aggregate lead to lower strength and poorer durability of recycled concrete, so the recycled concrete is mostly used in the non-structural non-load-bearing concrete fields such as backfill, roadbeds and the like at present. The utilization rate of recycled concrete is very low due to the limitation of the application field. The low mechanical properties of recycled concrete become a bottleneck restricting the application of recycled concrete.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a preparation method of building solid waste recycled sand powder concrete.
The aim of the invention is realized by adopting the following technical scheme:
in a first aspect, the invention discloses a preparation method of building solid waste recycled sand powder concrete, which comprises the following steps:
step 1, collecting building solid waste materials, and crushing to obtain solid waste sand powder;
step 2, performing alkali excitation treatment on the solid waste sand powder under the action of an alkali excitant to obtain regenerated sand powder;
step 3, mixing the reclaimed sand powder with cement, aggregate, fly ash, a water reducing agent and water, and uniformly stirring to form mixed slurry;
and 4, pouring the mixed slurry into a mould, beating, discharging and foaming, standing for 2-3 days, removing the mould, and curing for 7-14 days to obtain the regenerated sand powder concrete.
Preferably, the median particle diameter of the solid waste sand powder obtained in the step 1 is 27.6 μm, the particle content of the solid waste sand powder with the particle diameter of less than 75 μm is 83.74%, the particle content of the solid waste sand powder with the particle diameter of less than 40 μm is 57.52%, and the particle content of the solid waste sand powder with the particle diameter of less than 10 μm is 23.25%.
Preferably, the pulverizing process in the step 1 includes: firstly, crushing the collected building solid waste materials by using a crusher to obtain particles with the particle size smaller than 5mm, then placing the materials in an oven for treatment until the materials are dried, and then finely grinding the materials in a ball mill to obtain the required particle size.
Preferably, in the step 2, the process of treating the solid waste sand powder by the alkali-activated agent comprises the following steps: mixing the solid waste sand powder and the alkali excitant into a stirrer, stirring for 15-30min at the speed of 100-200r/min, and drying in an oven to obtain the regenerated sand powder.
Preferably, the alkali-activator in the step 2 is a sodium silicate and zinc aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing tartaric acid and deionized water, mixing, adding a silane coupling agent, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride and aluminum chloride into deionized water, and fully mixing and stirring to obtain zinc-aluminum mixed solution;
(3) Mixing tartaric acid solution and zinc-aluminum mixed solution, heating to 110-120 ℃, reacting for 2-3 hours, cooling to 40-50 ℃, filtering, collecting filtrate, adjusting the pH of the reaction solution to 7.0-8.0, and drying to obtain zinc-aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc aluminum tartrate, and dispersing to obtain alkali activator.
Preferably, in the step (1), the tartaric acid is DL-tartaric acid, and the silane coupling agent is one of KH-550, KH-560 and KH-570.
Preferably, the mass ratio of tartaric acid, the silane coupling agent and deionized water in the tartaric acid solution in the step (1) is 1.5-3:0.2-0.4:20-30.
Preferably, in the zinc-aluminum mixed solution in the step (2), the mass ratio of zinc chloride to aluminum chloride to deionized water is 1.36-2.72:0.67-1.33:20-40.
Preferably, in the step (3), the mass ratio of the tartaric acid solution to the zinc-aluminum mixed solution is 1.5-2:1.
Preferably, in the step (4), the mass ratio of the sodium silicate to the zinc aluminum tartrate to the deionized water is 1.8-3.6:0.2-0.8:10.
Preferably, in the step 3, the mass ratio of the cement, the aggregate, the reclaimed sand powder, the fly ash, the water reducing agent and the water is 100-150:278-426:29-58:30-50:3-8:180-260.
Preferably, in the step 3, the aggregate includes coarse aggregate and fine aggregate, the coarse aggregate is stone with a particle size of 4.75-9.5mm, the fine aggregate is gravel with a particle size of less than 4.75mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1.5-1.8:1.
Preferably, in the step 3, the cement is ordinary Portland cement PO42.5, the model of the fly ash is level I, and the water reducing agent is naphthalene-based high-efficiency water reducing agent SY-05.
Preferably, in the step 4, the curing is curing with a plastic film coating with a thickness of 0.1mm, so as to avoid direct sunlight, and water is sprayed to supplement water if necessary.
In a second aspect, the invention discloses a building solid waste recycled sand powder concrete, which is prepared by the method.
The beneficial effects of the invention are as follows:
1. the invention processes the construction solid waste material and then uses the construction solid waste material in the preparation of concrete. The method has the advantages that the method can keep the early strength of the concrete high, and overcomes the defect that the traditional alkali excitation treatment is easy to crack.
2. The alkali-activated material can be used for concrete to increase the early strength and the drying time of the concrete, but has the defects of high brittleness and low toughness, so that the material is easy to crack due to dry shrinkage. In order to improve the phenomenon, a certain amount of zinc aluminum tartrate is added into the conventional sodium silicate solution, the zinc aluminum tartrate can be used as a buffering agent, on one hand, in the process of mixing an alkali-activated agent and sand powder, the zinc aluminum tartrate can be coated on the surface of the sand powder, so that the reaction of the sand powder and alkali is relieved to a certain extent, and on the other hand, zinc and aluminum in the zinc aluminum tartrate are both amphoteric metals, so that a certain amount of alkali is consumed in the concrete curing process, and the generation of expanded gelatinous bodies is slowed down.
3. The alkali-exciting agent used in the invention uses amphoteric metals zinc and aluminum, the tartrate of the amphoteric metals zinc and aluminum has strong water solubility, and can be dispersed in a solvent more uniformly, and if insoluble metals such as calcium and the like are adopted, the dispersibility and stability of the alkali-exciting agent are reduced, so that the performance of the alkali-exciting agent is affected. In addition, the invention also finds that the tartrate obtained by using zinc and aluminum in a certain proportion has better performance compared with pure aluminum tartrate or zinc tartrate.
Detailed Description
The technical scheme of the invention is described below through specific examples. It is to be understood that the mention of one or more method steps of the present invention does not exclude the presence of other method steps before and after the combination step or that other method steps may be interposed between these explicitly mentioned steps; it should also be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the method steps is merely a convenient tool for identifying the method steps and is not intended to limit the order of arrangement of the method steps or to limit the scope of the invention in which the invention may be practiced, as such changes or modifications in their relative relationships may be regarded as within the scope of the invention without substantial modification to the technical matter.
In order to better understand the above technical solution, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the invention are shown, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention is further described with reference to the following examples.
Example 1
The preparation method of the building solid waste regenerated sand powder concrete comprises the following steps:
step 1, collecting building solid waste materials, crushing the collected building solid waste materials by using a crusher to obtain particles with the particle size smaller than 5mm, then placing the materials in an oven for treatment until the materials are dried, and then finely grinding the materials in a ball mill to obtain solid waste sand powder with the particle median particle size of 27.6 mu m, the particle content smaller than 75 mu m of 83.74%, the particle content smaller than 40 mu m of 57.52% and the particle content smaller than 10 mu m of 23.25%;
the ingredients of the solid waste sand powder are shown in the following table 1:
TABLE 1 component content of solid waste Sand powder
Step 2, mixing the solid waste sand powder and the alkali excitant into a stirrer, stirring for 15-30min at the speed of 100-200r/min, and drying in an oven to obtain regenerated sand powder;
wherein, the alkali activator is a sodium silicate and zinc aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing DL-tartaric acid and deionized water, mixing, adding a silane coupling agent KH-550, wherein the mass ratio of the tartaric acid to the silane coupling agent to the deionized water is 2.2:0.3:25, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride and aluminum chloride into deionized water, wherein the mass ratio of the zinc chloride to the aluminum chloride to the deionized water is 2.04:1:30, and fully mixing and stirring to obtain zinc-aluminum mixed solution;
(3) Mixing tartaric acid solution and zinc-aluminum mixed solution, wherein the mass ratio of the tartaric acid solution to the zinc-aluminum mixed solution is 1.8:1, heating to 120 ℃, cooling to 45 ℃ after reacting for 2 hours, filtering and collecting filtrate, adjusting the pH value of the reaction solution to 7.0-8.0, and drying to obtain zinc-aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc aluminum tartrate, and dispersing the mixture into deionized water at a mass ratio of 2.7:0.5:10 to obtain the alkali-activated agent.
Step 3, mixing the reclaimed sand powder with cement, aggregate, fly ash, a water reducer and water, wherein the mass ratio of the cement to the aggregate to the reclaimed sand powder to the fly ash to the water reducer to the water is 120:358:43:40:5:220, and then uniformly stirring to form mixed slurry;
wherein the aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate is stone with the grain diameter of 4.75-9.5mm, the fine aggregate is gravel with the grain diameter of less than 4.75mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1.6:1; the cement is ordinary Portland cement PO42.5, the model of the fly ash is level I, and the water reducer is naphthalene-based high-efficiency water reducer SY-05.
And 4, pouring the mixed slurry into a mould, beating, discharging and foaming, standing for 2-3 days, removing the mould, and curing for 7-14 days by using a plastic film coating with the thickness of 0.1mm to avoid direct sunlight, and spraying water to supplement water if necessary to obtain the reclaimed sand powder concrete.
Example 2
The preparation method of the building solid waste recycled sand powder concrete is slightly different from the preparation process of the alkali-activated agent in the step 2, wherein the alkali-activated agent is a sodium silicate and zinc aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing DL-tartaric acid and deionized water, mixing, adding a silane coupling agent KH-560, wherein the mass ratio of the tartaric acid to the silane coupling agent to the deionized water is 1.5:0.2:20, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride and aluminum chloride into deionized water, wherein the mass ratio of the zinc chloride to the aluminum chloride to the deionized water is 1.36:0.67:20, and fully mixing and stirring to obtain zinc-aluminum mixed solution;
(3) Mixing tartaric acid solution and zinc-aluminum mixed solution, wherein the mass ratio of the tartaric acid solution to the zinc-aluminum mixed solution is 1.5:1, heating to 110 ℃, cooling to 40 ℃ after reacting for 2 hours, filtering and collecting filtrate, adjusting the pH value of the reaction solution to 7.0-8.0, and drying to obtain zinc-aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc aluminum tartrate, and dispersing the mixture into the deionized water at a mass ratio of 1.8:0.2:10 to obtain the alkali-activated agent.
Example 3
The preparation method of the building solid waste recycled sand powder concrete is slightly different from the preparation process of the alkali-activated agent in the step 2, wherein the alkali-activated agent is a sodium silicate and zinc aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing DL-tartaric acid and deionized water, mixing, adding a silane coupling agent KH-570, wherein the mass ratio of the tartaric acid to the silane coupling agent to the deionized water is 3:0.4:30, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride and aluminum chloride into deionized water, wherein the mass ratio of the zinc chloride to the aluminum chloride to the deionized water is 2.72:1.33:40, and fully mixing and stirring to obtain zinc-aluminum mixed solution;
(3) Mixing tartaric acid solution and zinc-aluminum mixed solution, wherein the mass ratio of the tartaric acid solution to the zinc-aluminum mixed solution is 2:1, heating to 120 ℃, cooling to 50 ℃ after reacting for 3 hours, filtering and collecting filtrate, adjusting the pH value of the reaction solution to 7.0-8.0, and drying to obtain zinc-aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc aluminum tartrate, and dispersing the mixture into the deionized water at a mass ratio of 3.6:0.8:10 to obtain the alkali-activated agent.
Example 4
The preparation method of the building solid waste recycled sand powder concrete is slightly different from that of the embodiment 1 in the content of each component in the step 3, and the mass ratio of cement, aggregate, recycled sand powder, fly ash, water reducer and water in the step 3 is 100:278:29:30:3:180.
Example 5
The preparation method of the building solid waste recycled sand powder concrete is slightly different from that of the embodiment 1 in the content of each component in the step 3, and the mass ratio of cement, aggregate, recycled sand powder, fly ash, water reducer and water in the step 3 is 150:426:58:50:8:260.
Comparative example 1
The preparation method of the building solid waste recycled sand powder concrete is different from that of the embodiment 1 in that the alkali-exciting agent in the step 2 is sodium silicate solution, and the preparation process is as follows:
mixing sodium silicate and deionized water, wherein the mass ratio of the sodium silicate to the deionized water is 2.7:10, and fully dispersing to form the alkali-activated agent.
Comparative example 2
The preparation method of the building solid waste recycled sand powder concrete is different from that of the embodiment 1 in that the alkali-exciting agent in the step 2 is sodium silicate and zinc tartrate composite solution, and the preparation process is as follows:
(1) Weighing DL-tartaric acid and deionized water, mixing, adding a silane coupling agent KH-550, wherein the mass ratio of the tartaric acid to the silane coupling agent to the deionized water is 2.2:0.3:25, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride into deionized water, wherein the mass ratio of the zinc chloride to the deionized water is 3.04:30, and fully mixing and stirring to obtain zinc liquid;
(3) Mixing tartaric acid solution and zinc solution, wherein the mass ratio of the tartaric acid solution to the zinc solution is 1.8:1, heating to 120 ℃, cooling to 45 ℃ after reacting for 2 hours, filtering and collecting filtrate, adjusting the pH of the reaction solution to 7.0-8.0, and drying to obtain zinc tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc tartrate, wherein the mass ratio of the sodium silicate to the zinc tartrate to the deionized water is 2.7:0.5:10, and fully dispersing to form the alkali-activated agent.
Comparative example 3
The preparation method of the building solid waste recycled sand powder concrete is different from that of the embodiment 1 in that the alkali-exciting agent in the step 2 is sodium silicate and aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing DL-tartaric acid and deionized water, mixing, adding a silane coupling agent KH-550, wherein the mass ratio of the tartaric acid to the silane coupling agent to the deionized water is 2.2:0.3:25, and fully stirring to obtain a tartaric acid solution;
(2) Mixing aluminum chloride into deionized water, wherein the mass ratio of the aluminum chloride to the deionized water is 3.04:30, and fully mixing and stirring to obtain aluminum liquid;
(3) Mixing tartaric acid solution and aluminum liquid, wherein the mass ratio of the tartaric acid solution to the aluminum liquid is 1.8:1, heating to 120 ℃, cooling to 45 ℃ after reacting for 2 hours, filtering and collecting filtrate, adjusting the pH value of the reaction liquid to 7.0-8.0, and drying to obtain aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding aluminum tartrate, and dispersing sodium silicate, aluminum tartrate and deionized water at a mass ratio of 2.7:0.5:10 to obtain alkali-activated agent.
Experimental example
The performances of the recycled sand powder concrete prepared in the example 1 and the comparative examples 1-3 are detected and compared, the cracking resistance grade is referred to JGJ/T193-2009 as a concrete durability test evaluation criterion, the compressive strength and the flexural strength are referred to GB/T50081-2002 as a common concrete mechanical property test method criterion, the shrinkage rate is referred to GB/T50082-2009 as a common concrete long-term performance and durability test method criterion, and the results are shown in Table 2:
table 2 regenerated sand powder concrete performance test
As can be seen from table 2, the reclaimed sand powder concrete prepared in example 1 has a higher cracking resistance level and is more excellent in both strength and shrinkage resistance, indicating that it has better performance than conventional alkali-activated concrete.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The preparation method of the building solid waste regenerated sand powder concrete is characterized by comprising the following steps of:
step 1, collecting building solid waste materials, and crushing to obtain solid waste sand powder;
step 2, performing alkali excitation treatment on the solid waste sand powder under the action of an alkali excitant to obtain regenerated sand powder;
step 3, mixing the reclaimed sand powder with cement, aggregate, fly ash, a water reducing agent and water, and uniformly stirring to form mixed slurry;
and 4, pouring the mixed slurry into a mould, beating, discharging and foaming, standing for 2-3 days, removing the mould, and curing for 7-14 days to obtain the regenerated sand powder concrete.
2. The method for preparing the construction solid waste reclaimed sand powder concrete according to claim 1, wherein the solid waste sand powder obtained in the step 1 has a median particle diameter of 27.6 μm, a particle content of 83.74% with a particle diameter of less than 75 μm, a particle content of 57.52% with a particle content of less than 40 μm and a particle content of 23.25% with a particle content of less than 10 μm.
3. The method for preparing the construction solid waste recycled sand powder concrete according to claim 1, wherein in the step 2, the process of treating the solid waste sand powder by the alkali-activated agent comprises the following steps: mixing the solid waste sand powder and the alkali excitant into a stirrer, stirring for 15-30min at the speed of 100-200r/min, and drying in an oven to obtain the regenerated sand powder.
4. The method for preparing the building solid waste recycled sand powder concrete according to claim 1, wherein the alkali-activated agent in the step 2 is a sodium silicate and zinc aluminum tartrate composite solution, and the preparation process is as follows:
(1) Weighing tartaric acid and deionized water, mixing, adding a silane coupling agent, and fully stirring to obtain a tartaric acid solution;
(2) Mixing zinc chloride and aluminum chloride into deionized water, and fully mixing and stirring to obtain zinc-aluminum mixed solution;
(3) Mixing tartaric acid solution and zinc-aluminum mixed solution, heating to 110-120 ℃, reacting for 2-3 hours, cooling to 40-50 ℃, filtering, collecting filtrate, adjusting the pH of the reaction solution to 7.0-8.0, and drying to obtain zinc-aluminum tartrate;
(4) Mixing sodium silicate with deionized water, adding zinc aluminum tartrate, and dispersing to obtain alkali activator.
5. The method for preparing building solid waste reclaimed sand powder concrete according to claim 1, wherein in the step (1), the tartaric acid is DL-tartaric acid, and the silane coupling agent is one of KH-550, KH-560 and KH-570; the mass ratio of tartaric acid to silane coupling agent to deionized water is 1.5-3:0.2-0.4:20-30; in the zinc-aluminum mixed solution in the step (2), the mass ratio of zinc chloride to aluminum chloride to deionized water is 1.36-2.72:0.67-1.33:20-40; in the step (3), the mass ratio of the tartaric acid solution to the zinc-aluminum mixed solution is 1.5-2:1; in the step (4), the mass ratio of the sodium silicate to the zinc aluminum tartrate to the deionized water is 1.8-3.6:0.2-0.8:10.
6. The method for preparing the building solid waste recycled sand powder concrete according to claim 1, wherein in the step 3, the mass ratio of cement, aggregate, recycled sand powder, fly ash, water reducer and water is 100-150:278-426:29-58:30-50:3-8:180-260.
7. The method for preparing the construction solid waste reclaimed sand powder concrete according to claim 6, wherein in the step 3, the aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate is stone with the particle size of 4.75-9.5mm, the fine aggregate is gravel with the particle size of less than 4.75mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1.5-1.8:1.
8. The method for preparing the building solid waste recycled sand powder concrete according to claim 6, wherein in the step 3, cement is ordinary Portland cement PO42.5, the type of fly ash is class I, and the water reducing agent is naphthalene-based high-efficiency water reducing agent SY-05.
9. The method for preparing the building solid waste recycled sand powder concrete according to claim 1, wherein in the step 4, the curing is to use a plastic film with the thickness of 0.1mm for film covering curing, direct sunlight is avoided, and water is sprayed to supplement water if necessary.
10. The construction solid waste recycled sand powder concrete is characterized by being prepared by the method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410125855.0A CN117865582A (en) | 2024-01-30 | 2024-01-30 | Preparation method of building solid waste recycled sand powder concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410125855.0A CN117865582A (en) | 2024-01-30 | 2024-01-30 | Preparation method of building solid waste recycled sand powder concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117865582A true CN117865582A (en) | 2024-04-12 |
Family
ID=90581014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410125855.0A Pending CN117865582A (en) | 2024-01-30 | 2024-01-30 | Preparation method of building solid waste recycled sand powder concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117865582A (en) |
-
2024
- 2024-01-30 CN CN202410125855.0A patent/CN117865582A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020063203A1 (en) | High-strength light-weight aggregate concrete and preparation method therefor | |
| CN110041028A (en) | A kind of regeneration concrete and preparation method thereof using building waste | |
| CN103803918A (en) | Porcelain powder waste mixed cement-based tiny-expansion crack repairing mortar and using method thereof | |
| CN107540285B (en) | Method for preparing finely ground glass powder building mortar by using waste oyster shells | |
| CN110790552A (en) | Waste brick regenerated ultrahigh-toughness mixture and preparation method and application thereof | |
| CN112573874A (en) | Preparation method of high-strength self-compacting concrete | |
| CN112110705A (en) | Self-repairing semi-rigid base material for recycling construction waste | |
| CN111253127A (en) | C30 carbon fiber broken brick recycled concrete and preparation method thereof | |
| CN113780734A (en) | Method for determining using amount of cladding material in coral aggregate modification treatment and modification method | |
| CN113860802A (en) | Environment-friendly high-performance mineral admixture and preparation method and application thereof | |
| CN101412595A (en) | Method for preparing concrete admixture from kaoline tailing | |
| CN107344842A (en) | A kind of good endurance Aggregate of recycled concrete aerated bricks and preparation method thereof | |
| CN110395954A (en) | A kind of electrolytic manganese residues lightweight aggregate hollow block and preparation method thereof | |
| CN114180914A (en) | High-strength concrete prepared by applying cobbles | |
| CN106587817B (en) | A kind of preparation method of high-adaptability concrete | |
| CN110451876B (en) | Self-repairing concrete with construction waste bricks as carriers and preparation method thereof | |
| CN112456891A (en) | Pervious concrete material prepared from waste baked bricks and application thereof | |
| WO2023226321A1 (en) | Modified municipal sludge for landfill covering and preparation method therefor | |
| CN110845188A (en) | Sand-free macroporous concrete and preparation method thereof | |
| CN116462437A (en) | Modified recycled aggregate and preparation method and application thereof | |
| CN114230299B (en) | Full-solid-waste high-performance light material and preparation method and application thereof | |
| CN113526889B (en) | Recycled aggregate and preparation method and application thereof | |
| CN117865582A (en) | Preparation method of building solid waste recycled sand powder concrete | |
| CN106045439B (en) | One kind utilizes autoclaved lime-sand brick and preparation method thereof made of rubber | |
| CN113912315A (en) | Reinforced recycled aggregate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |