CN114920491A - Rebound-reducing shotcrete admixture and preparation method thereof - Google Patents
Rebound-reducing shotcrete admixture and preparation method thereof Download PDFInfo
- Publication number
- CN114920491A CN114920491A CN202210635148.7A CN202210635148A CN114920491A CN 114920491 A CN114920491 A CN 114920491A CN 202210635148 A CN202210635148 A CN 202210635148A CN 114920491 A CN114920491 A CN 114920491A
- Authority
- CN
- China
- Prior art keywords
- rebound
- admixture
- reducing
- shotcrete
- parts
- 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
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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a rebound-reducing shotcrete admixture and a preparation method thereof, relating to the technical field of concrete admixtures, and the rebound-reducing shotcrete admixture comprises the following components in parts by weight: 30-50 parts of organic acid activated silicate admixture, 0.15-0.5 part of cellulose thickener, 30-50 parts of quick-hardening cement and 5-20 parts of early strength agent; the preparation method comprises the steps of sequentially adding the quick-hardening cement, the cellulose thickener and the early strength agent into the organic acid activated silicate admixture in the stirring process, and stirring and mixing to obtain the quick-hardening cement. The admixture of the invention is added into sprayed concrete, which can obviously improve the cohesiveness, the fluidity and the water-retaining property of the concrete, promote the hydration of cement, shorten the setting time of the concrete, greatly reduce the rebound rate of the sprayed concrete on a vertical surface and a top surface and improve the early and later mechanical properties of the sprayed concrete.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a rebound-reducing shotcrete admixture and a preparation method thereof.
Background
The sprayed concrete has the advantages of fast setting and hardening, high early strength, saving in supporting template and other advantages, and may be used widely in the initial support, structure reinforcing and other engineering of tunnel, mine and underground comprehensive pipe gallery. At present, the shotcrete which is one of main supporting forms of projects such as tunnels, underground and the like is widely applied, but the defects of high rebound rate (the rebound rate of a vertical surface reaches more than 25 percent, and the rebound rate of an arch top surface reaches more than 35 percent) and low later strength retention ratio during construction exist, huge pollution and waste are caused, the early performance and the use quality of the concrete are influenced, rework can be caused in serious cases, and the cost input is increased. Therefore, it is important to develop an admixture capable of reducing the rebound resilience of shotcrete.
In the prior art, methods for reducing the rebound rate of sprayed concrete comprise the following steps: adding composite fiber, air entraining agent, defoaming agent, nanometer admixture and the like. Patent CN 109437722A discloses a low-resilience early-high-strength wet-spraying concrete and application thereof, and the formula of the admixture comprises the following components: 500 parts of cement 380-doped materials, 1000 parts of sand 800-doped materials, 800 parts of gravel 650-doped materials, 10-30 parts of accelerating agent, 200 parts of water 160-doped materials, 20-30 parts of high-strength ultra-micro additive and 40-50 parts of fly ash, can improve the cohesive force of wet-sprayed concrete and reduce the rebound rate of concrete, and can normally spray concrete in a water-rich area and can be directly applied to the primary support construction of a tunnel. Patent CN111925149A discloses a composite admixture for shotcrete, which comprises the following components by weight: 5-20 parts of polycarboxylic acid water reducing agent, 1-5 parts of alcohol ether sulfo succinic acid monoester disodium salt, 2-8 parts of tackifier, 1-3 parts of ammonium nitrate, 5-10 parts of alcohol amine carboxylate, 0.01-0.1 part of sodium dodecyl benzene sulfonate, 0.01-0.1 part of organic silicon defoamer and 30-80 parts of ultrafine fly ash, so that the contact between the concrete and a spraying surface is good, the problem of serious rebound of sprayed concrete is effectively solved, the coagulation and solidification of the sprayed concrete can be accelerated, and the strength of the concrete is improved. However, in the prior art, the rebound rate is reduced by improving the cohesiveness of the shotcrete by adding a nano admixture, a thickening agent and the like, and the defects that the improvement of the cohesiveness of the shotcrete in a single mode is not obvious, the coagulation of the shotcrete cannot be effectively promoted, the effect of reducing the rebound rate is general, and the effect of improving the mechanical properties of the concrete in early and later stages is not obvious are overcome.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the rebound-reducing shotcrete admixture and the preparation method thereof, and through reasonable selection and optimization of the admixture, the thickening agent, the quick-hardening cement and the early strength agent in the admixture formula, the cohesiveness and the rheological property of the shotcrete can be obviously improved, the quick setting of the shotcrete can be promoted, the rebound rate of the shotcrete is reduced, and the early and later mechanical properties of the shotcrete are improved.
The invention provides a rebound reducing shotcrete admixture which comprises the following components in parts by weight: 30-50 parts of organic acid activated silicate admixture, 0.15-0.5 part of cellulose thickener, 30-50 parts of quick-hardening cement and 5-20 parts of early strength agent.
Preferably, the silicate mineral is activated by organic acid, and then is dried and mechanically activated to obtain the silicate mineral admixture.
Preferably, the organic acid is composed of 10-30 mmol/L oxalic acid and 10-30 mmol/L citric acid; the silicate mineral is metakaolin or wollastonite.
Preferably, the organic acid activated silicate admixture is specifically prepared as follows: dissolving oxalic acid and citric acid in water, preparing an organic acid solution with the acid concentration of 20-60 mmol/L, adding silicate minerals, stirring at a low speed of 10-30 r/min for acid activation for 7d, cleaning, drying, and performing ball milling activation for 4-6 h to obtain the nano-silver-doped zinc oxide.
Preferably, the cellulose-based thickener comprises one of methyl cellulose ether, ethyl cellulose ether, and hydroxypropyl methyl cellulose ether.
Preferably, the rapid hardening cement comprises one of sulphoaluminate cement and aluminate cement.
Preferably, the early strength agent comprises one of calcium formate and sodium sulfate.
The invention also provides a preparation method of the rebound-reducing shotcrete admixture, which comprises the following steps: and in the stirring process, sequentially adding the quick-hardening cement, the cellulose thickener and the early strength agent into the organic acid activated silicate admixture, and stirring and mixing to obtain the quick-hardening cement.
Compared with the prior art, the invention has the beneficial effects that:
1. the organic acid activated silicate in the additive is used as an admixture, so that the early and later mechanical property effects of the concrete can be improved, and the resilience rate is reduced; the preparation method comprises the steps of firstly activating with acid, and under the mutual promotion and synergistic effect of mixed acid of citric acid and oxalic acid, the crystal structures of silicate minerals such as metakaolin, wollastonite and the like are quickly destroyed, so that the activity is increased, and the early and later mechanical properties of the sprayed concrete are improved; and the specific surface area of the silicate mineral is increased through mechanical activation, the compactness of the sprayed concrete is enhanced, and the workability of the concrete is improved, so that the rebound rate of the sprayed concrete is reduced.
2. The organic acid activated silicate admixture in the admixture is used together with the cellulose thickener, so that the cohesiveness and the rheological property of sprayed concrete are obviously improved; the cellulose thickener has a large amount of hydroxyl and ether bonds, and organic acid activated silicate can be chemically bonded with the cellulose thickener, so that the cohesiveness of sprayed concrete is improved, the rheological property of the concrete is improved, the constructability of the sprayed concrete is improved, and the rebound rate of the sprayed concrete is reduced.
3. The rapid hardening cement and the early strength agent in the admixture are used together, so that the rapid hardening and the early strength of the sprayed concrete can be promoted, the rebound rate of the sprayed concrete is greatly reduced, and the consumption and the cost of the concrete are saved.
The admixture of the invention is added into sprayed concrete, which can obviously improve the cohesiveness, the fluidity and the water-retaining property of the concrete, promote the hydration of cement, shorten the setting time of the concrete, greatly reduce the rebound rate of the sprayed concrete on a vertical surface and a top surface and improve the early and later mechanical properties of the sprayed concrete.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The embodiment prepares the rebound-reducing shotcrete admixture according to the following steps and proportions:
firstly, preparing organic acid activated metakaolin powder, which comprises the following steps:
step 1: preparing a certain amount of mixed acid solution of 25mmol/L oxalic acid and 25mmol/L citric acid, then pouring metakaolin into the mixed acid solution for acidification treatment for 7 days, stirring at low speed (30r/min), then rinsing with water for at least 3 times, and precipitating;
and 2, step: pumping out supernatant liquor of the precipitate, and drying the precipitated organic acid activated metakaolin;
and step 3: and performing ball milling activation treatment on the dried precipitate for 6 hours to obtain organic acid activated metakaolin powder.
Secondly, preparing the rebound-reducing shotcrete admixture by the following steps:
step 1: adding 30 parts of organic acid activated metakaolin powder into a feed inlet of powder mixing equipment, and starting a powder mixing and stirring device;
step 2: in the stirring process, 50 parts of sulphoaluminate cement, 0.15 part of methyl cellulose ether and 20 parts of calcium formate are sequentially added;
and 3, step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
Example 2
The embodiment prepares the rebound-reducing shotcrete admixture according to the following steps and proportions:
firstly, preparing wollastonite powder activated by organic acid, which comprises the following steps:
step 1: preparing a certain amount of mixed acid solution of 10mmol/L oxalic acid and 10mmol/L citric acid, then pouring wollastonite into the mixed acid solution for acidification for 7 days, stirring at a low speed (10r/min), and then rinsing with water for at least 3 times for precipitation;
step 2: pumping out supernatant liquor of the precipitate, and drying the precipitated wollastonite activated by the organic acid;
and step 3: and performing ball milling activation treatment on the dried precipitate for 4 hours to obtain the wollastonite powder activated by the organic acid.
Secondly, preparing the rebound-reducing shotcrete admixture by the following steps:
step 1: adding 50 parts of organic acid activated wollastonite powder into a feeding port of powder mixing equipment, and starting a powder mixing and stirring device;
step 2: during the stirring process, 30 parts of aluminate cement, 0.5 part of ethyl cellulose ether and 20 parts of sodium sulfate are sequentially added;
and step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
Example 3
The embodiment prepares the rebound-reducing shotcrete admixture according to the following steps and proportions:
firstly, preparing organic acid activated metakaolin powder, which comprises the following steps:
step 1: preparing a certain amount of mixed acid solution of 30mmol/L oxalic acid and 30mmol/L citric acid, then pouring metakaolin into the mixed acid solution for acidification treatment for 7d, stirring at low speed (20r/min), then rinsing with water for at least 3 times, and precipitating;
step 2: pumping out supernatant liquor of the precipitate, and drying the precipitated organic acid activated metakaolin;
and step 3: and performing ball milling treatment on the dried precipitate for 5 hours to obtain organic acid activated metakaolin powder.
Secondly, preparing the rebound-reducing shotcrete admixture by the following steps:
step 1: adding 50 parts of organic acid activated metakaolin powder into a feed inlet of powder mixing equipment, and starting a powder mixing and stirring device;
step 2: during the stirring process, 45 parts of sulphoaluminate cement, 0.3 part of hydroxypropyl methyl cellulose ether and 5 parts of calcium formate are sequentially added;
and 3, step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
Example 4
The embodiment prepares the rebound reducing shotcrete admixture according to the following steps and proportions:
firstly, preparing wollastonite powder activated by organic acid, which comprises the following steps:
step 1: preparing a certain amount of mixed acid solution of 20mmol/L oxalic acid and 30mmol/L citric acid, then pouring wollastonite into the mixed acid solution for acidification for 7 days, stirring at a low speed (30r/min), and then rinsing with water for at least 3 times for precipitation;
and 2, step: pumping out supernatant liquor of the precipitate, and drying the precipitated wollastonite activated by the organic acid;
and step 3: and performing ball milling activation treatment on the dried precipitate for 6 hours to obtain the wollastonite powder activated by the organic acid.
Secondly, preparing the rebound-reducing shotcrete admixture by the following steps:
step 1: adding 45 parts of organic acid activated wollastonite powder into a feeding port of powder mixing equipment, and starting a powder mixing and stirring device;
and 2, step: during the stirring process, 40 parts of aluminate cement, 0.4 part of ethyl cellulose ether and 15 parts of calcium formate are sequentially added;
and 3, step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
Comparative example 1
A shotcrete admixture, which is different from example 1 only in that metakaolin which is not subjected to acid activation treatment is used in the formulation instead of the metakaolin powder which is subjected to organic acid activation treatment in example 1, is prepared by the following steps:
step 1: adding 30 parts of metakaolin into a feeding port of powder mixing equipment, and starting a powder mixing and stirring device;
and 2, step: in the stirring process, 50 parts of sulphoaluminate cement, 0.15 part of methyl cellulose ether and 20 parts of calcium formate are sequentially added;
and step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
Comparative example 2
Compared with the example 1, the sprayed concrete admixture is only characterized in that acid-activated metakaolin powder is adopted in the formula, and the metakaolin powder is not subjected to ball milling treatment after being dried, and the preparation steps are as follows:
step 1: preparing a certain amount of mixed acid solution of 25mmol/L oxalic acid and 25mmol/L citric acid, then pouring metakaolin into the mixed acid solution for acidification treatment for 7 days, stirring at low speed (30r/min), then rinsing with water for at least 3 times, and precipitating;
and 2, step: and (4) pumping out supernatant liquor of the precipitate, and drying the precipitated organic acid activated metakaolin to obtain organic acid activated metakaolin powder.
Secondly, preparing the rebound-reducing shotcrete admixture by the following steps:
step 1: adding 30 parts of organic acid activated metakaolin powder into a feed inlet of powder mixing equipment, and starting a powder mixing and stirring device;
step 2: in the stirring process, 50 parts of sulphoaluminate cement, 0.15 part of methyl cellulose ether and 20 parts of calcium formate are sequentially added;
and step 3: and after the feeding is finished, stirring for 2 hours to prepare the uniformly mixed rebound-reducing shotcrete admixture.
The rebound-reducing shotcrete admixtures prepared in examples 1 to 4 and comparative examples 1 to 2 were added to shotcrete in an amount of 4%, wherein the shotcrete mix ratio is as shown in Table 1 below, and the test results of the shotcrete on site are as shown in Table 2 below.
TABLE 1C25 spray concrete mix proportion (kg/m) 3 )
Remarking: the accelerator is used for controlling the dosage of sprayed concrete in the spraying process on site by adjusting an accelerator flow valve.
TABLE 2 in situ C25 shotcrete test results
As can be seen from Table 1, under the condition of keeping the water-cement ratio and the concrete slump constant, the addition of the rebound-reducing shotcrete admixture prepared in the embodiments 1-4 of the present invention can increase the amount of the water reducing agent, which is mainly related to that the rebound-reducing shotcrete admixture is a high surface area and high activity admixture, and the water demand is higher than that of ordinary cement.
As can be seen from Table 2, the addition of the rebound-reducing shotcrete admixture can improve the cohesiveness and water retention of the concrete, is beneficial to improving the construction speed of on-site wet shotcrete, and can promote the hardening of the concrete and shorten the setting time of the concrete. The shotcrete doped with the rebound reducing shotcrete admixture can significantly reduce the rebound rates of the vertical and top surfaces of the shotcrete compared to the blank shotcrete, wherein the rebound rates of the vertical and top surfaces of the blank shotcrete are 26.5% and 37.8%, respectively, and the rebound rates of the vertical and top surfaces of the shotcrete doped with the rebound reducing shotcrete admixture are about 5% and 10%, respectively. In addition, the shotcrete blended with the rebound-reducing shotcrete admixture can improve the compressive strength of the shotcretes 7d and 28d as compared with the plain concrete, wherein the strength retention ratios of the shotcretes 7d and 28d of examples 1 to 4 are more than 115% and 118%, respectively.
Comparative example 1 and comparative example 2 compared with the shotcrete of example 1, the rebound reducing shotcrete admixture prepared from the acidified metakaolin which is not subjected to the acidification treatment and the acidification and drying treatment without the ball milling treatment was relatively poor in the improvement effect on the cohesiveness of the concrete, longer in the hardening time, greater in the rebound rate on the vertical surface and the top surface, and less obvious in the improvement effect on the compressive strength of the shotcrete 7d and 28d, compared with the rebound reducing shotcrete admixture prepared from the acidified metakaolin which is subjected to the acidification, the drying and the ball milling treatment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (8)
1. The rebound-reducing shotcrete admixture is characterized by comprising the following components in parts by weight: 30-50 parts of organic acid activated silicate admixture, 0.15-0.5 part of cellulose thickener, 30-50 parts of quick-hardening cement and 5-20 parts of early strength admixture.
2. The rebound-reducing shotcrete admixture according to claim 1, wherein the silicate mineral is activated with an organic acid, and then dried and mechanically activated.
3. The rebound-reducing shotcrete admixture according to claim 2, wherein the organic acid is composed of 10 to 30mmol/L oxalic acid and 10 to 30mmol/L citric acid; the silicate mineral is metakaolin or wollastonite.
4. The rebound-reducing shotcrete admixture according to claim 3, wherein the organic acid activated silicate admixture is specifically prepared as follows: dissolving oxalic acid and citric acid in water, preparing an organic acid solution with the acid concentration of 20-60 mmol/L, adding silicate minerals, stirring at a low speed of 10-30 r/min for acid activation treatment for 7 days, cleaning, drying, and performing ball milling activation treatment for 4-6 hours to obtain the nano-silver zinc oxide.
5. The rebound-reducing shotcrete admixture according to claim 1, wherein the cellulosic thickener comprises one of a methyl cellulose ether, an ethyl cellulose ether, and a hydroxypropyl methyl cellulose ether.
6. The rebound-reducing shotcrete admixture according to claim 1, wherein the quick-hardening cement comprises one of a quick-hardening cement comprising a sulphoaluminate cement and an aluminate cement.
7. The rebound-reducing shotcrete admixture according to claim 1, wherein the early strength agent comprises one of calcium formate and sodium sulfate.
8. The method for preparing the rebound-reducing shotcrete admixture according to claims 1 to 7, comprising the steps of: and in the stirring process, sequentially adding the quick-hardening cement, the cellulose thickener and the early strength agent into the organic acid activated silicate admixture, and stirring and mixing to obtain the quick-hardening cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635148.7A CN114920491B (en) | 2022-06-06 | 2022-06-06 | Rebound-reducing shotcrete admixture and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635148.7A CN114920491B (en) | 2022-06-06 | 2022-06-06 | Rebound-reducing shotcrete admixture and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114920491A true CN114920491A (en) | 2022-08-19 |
| CN114920491B CN114920491B (en) | 2023-01-24 |
Family
ID=82812431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210635148.7A Active CN114920491B (en) | 2022-06-06 | 2022-06-06 | Rebound-reducing shotcrete admixture and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114920491B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118307236A (en) * | 2024-05-11 | 2024-07-09 | 广东省五源建材有限公司 | Anchoring bullet reducing agent for sprayed concrete and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004315244A (en) * | 2003-04-11 | 2004-11-11 | Denki Kagaku Kogyo Kk | Spray material composition, spray material, and spraying method using it |
| CN102515653A (en) * | 2012-01-09 | 2012-06-27 | 山西潞安环保能源开发股份有限公司 | Formula of high-intensity sprayed concrete |
| CN102826774A (en) * | 2012-09-17 | 2012-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Nanoscale sprayed concrete modified-admixture |
| CN105174787A (en) * | 2015-09-24 | 2015-12-23 | 滁州京安工贸有限责任公司 | Concrete and mortar accelerator |
| CN108545975A (en) * | 2018-04-27 | 2018-09-18 | 成都东蓝星新材料有限公司 | A kind of modified SILICA FUME of gunite concrete |
| CN111995285A (en) * | 2020-09-17 | 2020-11-27 | 刘翠芬 | Sprayed concrete rebound inhibitor and use method thereof |
| CN112441760A (en) * | 2020-11-26 | 2021-03-05 | 中交武汉港湾工程设计研究院有限公司 | Composite admixture for sprayed concrete and preparation method and application thereof |
-
2022
- 2022-06-06 CN CN202210635148.7A patent/CN114920491B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004315244A (en) * | 2003-04-11 | 2004-11-11 | Denki Kagaku Kogyo Kk | Spray material composition, spray material, and spraying method using it |
| CN102515653A (en) * | 2012-01-09 | 2012-06-27 | 山西潞安环保能源开发股份有限公司 | Formula of high-intensity sprayed concrete |
| CN102826774A (en) * | 2012-09-17 | 2012-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Nanoscale sprayed concrete modified-admixture |
| CN105174787A (en) * | 2015-09-24 | 2015-12-23 | 滁州京安工贸有限责任公司 | Concrete and mortar accelerator |
| CN108545975A (en) * | 2018-04-27 | 2018-09-18 | 成都东蓝星新材料有限公司 | A kind of modified SILICA FUME of gunite concrete |
| CN111995285A (en) * | 2020-09-17 | 2020-11-27 | 刘翠芬 | Sprayed concrete rebound inhibitor and use method thereof |
| CN112441760A (en) * | 2020-11-26 | 2021-03-05 | 中交武汉港湾工程设计研究院有限公司 | Composite admixture for sprayed concrete and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118307236A (en) * | 2024-05-11 | 2024-07-09 | 广东省五源建材有限公司 | Anchoring bullet reducing agent for sprayed concrete and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114920491B (en) | 2023-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108911567B (en) | Special additive for high-strength concrete and preparation method thereof | |
| CN111499294B (en) | Ultrahigh-performance concrete dry powder and preparation method thereof | |
| CN104961423A (en) | Machine-spraying-type plastering gypsum mortar and preparation technology thereof | |
| CN111072366B (en) | Inorganic grouting material capable of stopping open water and reinforcing structure and preparation method and application thereof | |
| CN109399999B (en) | Green high-early-strength low-alkali liquid accelerator and preparation method thereof | |
| CN102464466B (en) | Shotcrete additive and spraying technology of shotcrete | |
| CN110451842B (en) | Viscosity adjusting admixture for jetting construction and preparation method thereof | |
| CN108545975A (en) | A kind of modified SILICA FUME of gunite concrete | |
| CN107572958A (en) | Ultra-low viscosity cement slurry and preparation method thereof | |
| CN111320416B (en) | Low-resilience high-strength sprayed concrete reinforcer | |
| CN109665743B (en) | Marble stone powder-based concrete admixture capable of reducing water bleeding and preparation method thereof | |
| CN111574099A (en) | Hollow anchor rod grouting material additive, preparation method and application | |
| CN110963732A (en) | Environment-friendly alkali-free liquid accelerator and normal-temperature preparation method thereof | |
| CN111548049B (en) | Composite retarding and water reducing agent and preparation method thereof | |
| CN114873950B (en) | Coagulation accelerating early strength agent for sprayed concrete and preparation method and use method thereof | |
| CN110156398B (en) | High-strength concrete and preparation method thereof | |
| CN111606598A (en) | Alkali-free accelerator and preparation process thereof | |
| CN111377638A (en) | Liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and preparation method thereof | |
| CN111606625B (en) | Formula and preparation method of C70 high-strength self-compacting concrete | |
| CN114920491B (en) | Rebound-reducing shotcrete admixture and preparation method thereof | |
| CN109534716B (en) | Self-compacting concrete additive and preparation method thereof | |
| CN110981260A (en) | Viscosity reducer for vibration-free concrete and preparation and use methods thereof | |
| CN109704693B (en) | Sulphoaluminate cement-based self-compacting mortar and use method thereof | |
| CN116768524A (en) | Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete | |
| CN107117854A (en) | A kind of preparation method of concrete pump-feed agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |