CN103387356A - Engineered cementitious composite (ECC) repairing material and preparation method thereof - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims description 3
- 239000011182 bendable concrete Substances 0.000 title abstract 9
- 239000004568 cement Substances 0.000 claims abstract description 54
- 239000002131 composite material Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 15
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 15
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 239000006004 Quartz sand Substances 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000008439 repair process Effects 0.000 claims description 29
- 239000010881 fly ash Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
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- 239000011159 matrix material Substances 0.000 description 2
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- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- 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
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Abstract
Description
技术领域technical field
本发明涉及水泥混凝土结构的快速修补材料，具体的是一种高延性水泥基复合修补材料。The invention relates to a rapid repair material for cement concrete structures, in particular to a high-ductility cement-based composite repair material.
背景技术Background technique
高延性的纤维增强水泥基复合材料（ECC）是基于微观力学原理优化设计的具有伪应变硬化特性和多缝开裂特征的一种新型土木工程材料。其中聚乙烯醇纤维(PVA)体积掺量通常在2％左右，其拉应变在2％～5％，是普通混凝土的几百倍，抗压强度在配合比合适的情况下可高达70～80MPa。高延性材料的高拉应变能力是基于它在受拉过程中能够形成“稳定状态开裂”。“稳定状态开裂”是指当拉应变超过1％时，材料中的裂缝宽度会稳定在60μm左右，随着拉应变的提高，裂缝宽度不发生改变而微裂缝的数目不断增加，即使在产生微裂缝后，这种材料依然具有良好的抗渗透性。由于裂缝宽度稳定在60μm左右，在干湿循环的状况下，在水的作用下，裂缝会自我修复重新愈合。因此，该材料具有高延性、高韧性、高承载力、耐久性、自修复和可持续性等典型特征，具有良好的耗能减震特性。近年来，高延性水泥基复合材料在世界范围内得到推广，在日本和美国等发达国家，已经作为一种理想材料已经被成功应用在水坝的修复、桥梁连接板、高层建筑的梁和桥面铺装等工程领域。High-ductility fiber-reinforced cementitious composite (ECC) is a new type of civil engineering material with pseudo-strain hardening and multi-slit cracking characteristics optimized based on micromechanics principles. Among them, the volume content of polyvinyl alcohol fiber (PVA) is usually about 2%, and its tensile strain is 2% to 5%, which is hundreds of times that of ordinary concrete. The compressive strength can be as high as 70 to 80 MPa when the mix ratio is appropriate. . The high tensile strain capacity of a highly ductile material is based on its ability to form "steady state cracking" during tension. "Steady state cracking" means that when the tensile strain exceeds 1%, the crack width in the material will be stable at about 60 μm. With the increase of the tensile strain, the crack width does not change and the number of micro cracks continues to increase. After cracking, this material still has good permeability resistance. Since the crack width is stable at about 60 μm, under the condition of dry-wet cycle, under the action of water, the crack will self-repair and re-heal. Therefore, the material has typical characteristics such as high ductility, high toughness, high bearing capacity, durability, self-healing and sustainability, and has good energy dissipation and shock absorption characteristics. In recent years, high-ductility cement-based composite materials have been promoted worldwide. In developed countries such as Japan and the United States, they have been successfully applied as an ideal material in dam repair, bridge connecting plates, beams and bridge decks of high-rise buildings. Paving and other engineering fields.
在传统的高延性水泥基复合材料的基础上，美国Victor C.Li课题组已经研发出高早强水泥基复合材料，用于工程修补。这种高早强水泥基复合材料实用特种早强水泥或早强添加剂，使材料具有很快的早期强度发展速度，并且在其原材料中舍去了粉煤灰。但是不掺加粉煤灰将导致材料的延性大大降低，所以他们在高早强水泥基复合材料中添加了空心玻璃珠等“人工缺陷材料”，以此保证材料的高延性，这相应的提高了材料的成本，这种高早强水泥基复合材料的成本约为600元/m3。但是在实际的修补工程中，有些大面积维修，并不需要修补材料在几个小时之内即可恢复使用，但是普通水泥基复合材料的养护时间又太长，对工程的影响较大。On the basis of traditional high-ductility cement-based composite materials, the research group of Victor C.Li in the United States has developed high-early-strength cement-based composite materials for engineering repairs. This high-early-strength cement-based composite material uses special early-strength cement or early-strength additives to make the material have a fast early-strength development speed, and fly ash is omitted from its raw materials. However, if no fly ash is added, the ductility of the material will be greatly reduced, so they added "artificial defect materials" such as hollow glass beads to the high early strength cement-based composite material to ensure the high ductility of the material, which correspondingly improves Taking into account the cost of materials, the cost of this high-early-strength cement-based composite material is about 600 yuan/m 3 . However, in actual repair projects, some large-scale repairs do not require repair materials to be restored within a few hours, but the maintenance time of ordinary cement-based composite materials is too long, which has a greater impact on the project.
发明内容Contents of the invention
要解决的技术问题：针对现有技术的不足，本发明提供强度发展快且性价比高，适用于工程使用的一种高延性水泥基复合修补材料及其制备方法，综合解决现有技术中的传统的高延性水泥基复合材料养护时间长、而高早强水泥基复合材料成本高等技术问题。Technical problem to be solved: Aiming at the deficiencies of the prior art, the present invention provides a high-ductility cement-based composite repair material and its preparation method, which has fast strength development and high cost performance, and is suitable for engineering use, and comprehensively solves the traditional problems in the prior art. The high-ductility cement-based composite materials have long curing time, and the high-early-strength cement-based composite materials have technical problems such as high cost.
技术方案：为解决上述技术问题，本发明采用以下技术方案：Technical solution: In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:
一种高延性水泥基复合修补材料，包括以下组分：水泥、粉煤灰、石英砂、水、减水剂、早强添加剂和聚乙烯醇纤维。A high-ductility cement-based composite repair material comprises the following components: cement, fly ash, quartz sand, water, water reducing agent, early strength additive and polyvinyl alcohol fiber.
进一步的，在本发明中，所述水泥、粉煤灰、石英砂、水、减水剂的质量份数为：Further, in the present invention, the mass parts of the cement, fly ash, quartz sand, water, and water reducing agent are:
所述早强添加剂为水泥和粉煤灰总质量的2.5～3.5%，所述聚乙烯醇纤维的体积占该修补材料总体积的1.5～2.5%。The early strength additive is 2.5-3.5% of the total mass of cement and fly ash, and the volume of the polyvinyl alcohol fiber accounts for 1.5-2.5% of the total volume of the repair material.
更为优选的，在本发明中，所述水泥、粉煤灰、石英砂、水、减水剂的质量份数为：More preferably, in the present invention, the mass parts of the cement, fly ash, quartz sand, water, and water reducing agent are:
所述早强添加剂为水泥和粉煤灰总质量的2.5～3.5%，所述聚乙烯醇纤维的体积占该修补材料总体积的2%。The early-strength additive is 2.5-3.5% of the total mass of cement and fly ash, and the volume of the polyvinyl alcohol fiber accounts for 2% of the total volume of the repair material.
进一步的，在本发明中，所述早强添加剂是复合型早强剂。Further, in the present invention, the early strength additive is a composite early strength agent.
进一步的，在本发明中，所述减水剂是聚羧酸型高效减水剂。Further, in the present invention, the water reducer is a polycarboxylate high-efficiency water reducer.
一种高延性水泥基复合修补材料的制备方法，包括顺序执行的以下步骤：A method for preparing a high-ductility cement-based composite repair material, comprising the following steps performed in sequence:
步骤1：加入相应质量比例的水泥、粉煤灰和石英砂倒入拌锅中搅拌均匀；Step 1: Add cement, fly ash and quartz sand in the corresponding mass ratio and pour into the mixing pot and stir evenly;
步骤2：待步骤1中的混合料搅拌均匀，称取相应质量比例的水和减水剂添加到拌锅中继续搅拌，直至浆体的流动性符合要求；Step 2: After the mixture in step 1 is stirred evenly, weigh the water and water reducer in the corresponding mass ratio and add them to the mixing pot to continue stirring until the fluidity of the slurry meets the requirements;
步骤3：在步骤2的基础上，依据配合比加入相应质量的聚乙烯醇纤维到拌锅中快速搅拌，直至纤维分散均匀；Step 3: On the basis of
步骤4：称取相应比例的早强添加剂，并添加到拌锅中快速搅拌，直至纤维水泥浆体在跳桌流动度实验条件下扩展半径达到20mm以上时停止搅拌。Step 4: Weigh the corresponding proportion of early-strength additives and add them to the mixing pot for rapid stirring until the expansion radius of the fiber cement slurry reaches 20 mm or more under the conditions of the table-hopping fluidity test. Stop stirring.
有益效果：Beneficial effect:
本发明的一种高延性水泥基复合修补材料，结合了传统高延性的纤维增强水泥基复合材料和高早强水泥基复合材料的优点，在原料中添加了大量廉价的粉煤灰一方面能够减弱基质材料的强度，优化基质材料与聚乙烯醇纤维的接触面，保证了材料的高延性能，另一方面粉煤灰的价格要远远低于人工缺陷材料，材料成本价降低到450元/m3；实验证明，本发明的一种高延性水泥基复合修补材料较普通的ECC材料具有更高的抗压强度和弯曲强度；A high-ductility cement-based composite repair material of the present invention combines the advantages of traditional high-ductility fiber-reinforced cement-based composite materials and high-early-strength cement-based composite materials, and adds a large amount of cheap fly ash to the raw materials. Weaken the strength of the matrix material, optimize the contact surface between the matrix material and polyvinyl alcohol fibers, and ensure the high ductility of the material. On the other hand, the price of fly ash is much lower than that of artificial defect materials, and the material cost price is reduced to 450 yuan. /m 3 ; Experiments have proved that a kind of high ductility cement-based composite repair material of the present invention has higher compressive strength and flexural strength than common ECC materials;
同时添加适量的早强添加剂，7天的强度能达到最终强度的80%，相比传统的高延性的纤维增强水泥基复合材料，在修补工程应用中可以减少养护时间尽快恢复使用，且时间上符合一般工程的需求。故本发明有良好的工程应用价值。At the same time, add an appropriate amount of early-strength additives, and the strength in 7 days can reach 80% of the final strength. Compared with traditional high-ductility fiber-reinforced cement-based composite materials, it can reduce the maintenance time in repair engineering applications and restore use as soon as possible. Meet the needs of general engineering. Therefore, the present invention has good engineering application value.
附图说明Description of drawings
图1为本发明提供的高延性水泥基复合修补材料的抗压强度与龄期关系对比示意图；Fig. 1 is the comparative schematic diagram of compressive strength and age relation of high ductility cement-based composite repair material provided by the present invention;
图2为本发明提供的传统的高延性水泥基复合材料与早强型高延性水泥基复合材料的典型弯拉应力和加载点位移关系对比示意图。Fig. 2 is a schematic diagram of the comparison between the typical flexural-tensile stress and the displacement of the loading point between the traditional high-ductility cement-based composite material provided by the present invention and the early-strength high-ductility cement-based composite material.
具体实施方式Detailed ways
一种高延性水泥基复合修补材料，包括以下组分：水泥、粉煤灰、石英砂、水、减水剂、早强添加剂和聚乙烯醇纤维。其中，早强添加剂是江苏苏博特新材料有限公司提供的复合型早强剂，减水剂是聚羧酸型高效减水剂。A high-ductility cement-based composite repair material comprises the following components: cement, fly ash, quartz sand, water, water reducing agent, early strength additive and polyvinyl alcohol fiber. Among them, the early-strength additive is a composite early-strength agent provided by Jiangsu Subote New Material Co., Ltd., and the water-reducer is a polycarboxylic acid-type high-efficiency water-reducer.
进一步的，在本发明中，所述水泥、粉煤灰、石英砂、水、减水剂的质量份数为：Further, in the present invention, the mass parts of the cement, fly ash, quartz sand, water, and water reducing agent are:
其中，水泥和粉煤灰的混合物称为凝胶材料，早强添加剂的质量为凝胶材料总质量的2.5～3.5%，所述聚乙烯醇纤维的体积占该修补材料总体积的1.5～2.5%。Wherein, the mixture of cement and fly ash is called gel material, the quality of the early strength additive is 2.5-3.5% of the total mass of the gel material, and the volume of the polyvinyl alcohol fiber accounts for 1.5-2.5% of the total volume of the repair material. %.
具体的各个实施例按如下表所示的各组分的份数进行配比：Concrete each embodiment carries out proportioning according to the parts of each component as shown in the table below:
以上各实施例均按照如下步骤的顺序进行混合制备：Each of the above embodiments is mixed and prepared according to the order of the following steps:
步骤1：加入相应质量比例的水泥、粉煤灰和石英砂倒入拌锅中搅拌均匀；Step 1: Add cement, fly ash and quartz sand in the corresponding mass ratio and pour into the mixing pot and stir evenly;
步骤2：待步骤1中的混合料搅拌均匀，称取相应质量比例的水和减水剂添加到拌锅中继续搅拌，直至浆体的流动性符合要求；Step 2: After the mixture in step 1 is stirred evenly, weigh the water and water reducer in the corresponding mass ratio and add them to the mixing pot to continue stirring until the fluidity of the slurry meets the requirements;
步骤3：在步骤2的基础上，依据配合比加入相应质量的聚乙烯醇纤维到拌锅中快速搅拌，直至纤维分散均匀；Step 3: On the basis of
步骤4：称取相应比例的早强添加剂，并添加到拌锅中快速搅拌，直至纤维水泥浆体在跳桌流动度实验条件下扩展半径达到20mm以上时停止搅拌。Step 4: Weigh the corresponding proportion of early-strength additives and add them to the mixing pot for rapid stirring until the expansion radius of the fiber cement slurry reaches 20 mm or more under the conditions of the table-hopping fluidity test. Stop stirring.
对制得的本发明的一种高延性水泥基复合修补材料的各个具体的实施例以及普通的ECC材料进行抗压强度与龄期关系的实验，得到如图1所示的对比示意图中，各个实施例的材料的抗压强度均优于普通的ECC材料。因此，在相同的养护龄期时，本发明的一种高延性水泥基复合修补材料较普通ECC材料明显具有更高的抗压强度。Each specific embodiment of the obtained high-ductility cement-based composite repair material of the present invention and the common ECC material are tested for the relationship between compressive strength and age, and in the comparative schematic diagram shown in Figure 1, each The compressive strength of the materials in the examples is better than that of ordinary ECC materials. Therefore, at the same curing age, a high-ductility cement-based composite repair material of the present invention has significantly higher compressive strength than ordinary ECC materials.
对制得的本发明的一种高延性水泥基复合修补材料的各个具体的实施例以及普通的ECC材料进行典型弯拉应力和加载点位移关系的实验，得到如图2所示的对比示意图，在相同加载点位移的情况下，在弹性变形阶段，各个实施例的材料与普通ECC材料的弹性模量相当、弯曲强度相当、变形相当；在弹性变形极限以及之后的屈服变形阶段，各个实施例的材料具有更高的弯曲强度。因此，在相同的位移情况下，本发明一种高延性水泥基复合修补材料较普通的ECC材料明显具有更高的弯曲强度。Each specific embodiment of the obtained high ductility cement-based composite repair material of the present invention and common ECC materials are carried out to carry out the experiment of typical bending-tensile stress and the displacement relation of loading point, obtain the comparative schematic diagram as shown in Figure 2, In the case of the same loading point displacement, in the elastic deformation stage, the elastic modulus, bending strength, and deformation of the materials of each embodiment are equivalent to those of ordinary ECC materials; at the elastic deformation limit and the subsequent yield deformation stage, each embodiment The material has higher bending strength. Therefore, in the case of the same displacement, a high-ductility cement-based composite repair material of the present invention has significantly higher bending strength than ordinary ECC materials.
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938794A (en) * | 2014-03-18 | 2014-07-23 | 上海罗洋新材料科技有限公司 | Ultra-high performance cement based groove type profile |
| CN104211358A (en) * | 2014-09-11 | 2014-12-17 | 中国中材国际工程股份有限公司 | Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof |
| CN105060784A (en) * | 2015-08-03 | 2015-11-18 | 东南大学 | High-ductility cement-based material for repairing hydraulic outlet works, and preparation method thereof |
| CN106045418A (en) * | 2016-05-31 | 2016-10-26 | 湖北工业大学 | Modified polyvinyl alcohol fibers for high-ductility cement-based composite material, modifying method and composite material prepared from modified polyvinyl alcohol fibers |
| CN106242429A (en) * | 2016-08-09 | 2016-12-21 | 郑州大学 | A kind of high tenacity concrete reinforced by assorted fiber and preparation method thereof |
| CN106278026A (en) * | 2016-08-09 | 2017-01-04 | 郑州大学 | A kind of cement-base composite material and preparation method thereof |
| CN106478024A (en) * | 2016-10-12 | 2017-03-08 | 北京工业大学 | A kind of high ductility, high-adhesion cement based reinforcing and repairing material and preparation method thereof |
| CN107285714A (en) * | 2017-07-31 | 2017-10-24 | 北京中震建筑科学研究院有限公司 | A kind of high ductility vinal concrete and preparation method thereof |
| CN110498649A (en) * | 2019-09-02 | 2019-11-26 | 东南大学 | A kind of low-shrinkage cement-based repair material and preparation method thereof |
| CN110606702A (en) * | 2019-08-28 | 2019-12-24 | 维特国际新材料（武汉）有限公司 | Bridge self-repairing paving method based on cement-based composite material |
| CN112341099A (en) * | 2020-11-23 | 2021-02-09 | 交通运输部天津水运工程科学研究所 | High-ductility repair mortar with self-healing function and preparation method thereof |
| CN114014615A (en) * | 2021-12-22 | 2022-02-08 | 山东铁壁虎建材有限公司 | Concrete rapid repair material with super early strength, low shrinkage and high ductility and preparation method thereof |
| CN114163192A (en) * | 2021-12-13 | 2022-03-11 | 内蒙古工业大学 | A kind of antifreeze and high ductility composite material and its preparation method and application |
| CN114591044A (en) * | 2022-01-26 | 2022-06-07 | 北京固斯特国际化工有限公司 | Salt-resistant, reinforcing, repairing, corrosion-resistant and anti-permeability coating for concrete structure of seawater cooling tower and application thereof |
| CN115745536A (en) * | 2022-12-16 | 2023-03-07 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared by calcining coal gangue powder and method |
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| CN102603234A (en) * | 2012-03-14 | 2012-07-25 | 东南大学 | Method for pre-mixing high-ductility cement-based composite material |
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| CN102603234A (en) * | 2012-03-14 | 2012-07-25 | 东南大学 | Method for pre-mixing high-ductility cement-based composite material |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938794A (en) * | 2014-03-18 | 2014-07-23 | 上海罗洋新材料科技有限公司 | Ultra-high performance cement based groove type profile |
| CN104211358A (en) * | 2014-09-11 | 2014-12-17 | 中国中材国际工程股份有限公司 | Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof |
| CN104211358B (en) * | 2014-09-11 | 2016-06-22 | 中国中材国际工程股份有限公司 | A kind of high-early-strength high ductility cement-base composite material and preparation method thereof |
| CN105060784A (en) * | 2015-08-03 | 2015-11-18 | 东南大学 | High-ductility cement-based material for repairing hydraulic outlet works, and preparation method thereof |
| CN106045418A (en) * | 2016-05-31 | 2016-10-26 | 湖北工业大学 | Modified polyvinyl alcohol fibers for high-ductility cement-based composite material, modifying method and composite material prepared from modified polyvinyl alcohol fibers |
| CN106242429A (en) * | 2016-08-09 | 2016-12-21 | 郑州大学 | A kind of high tenacity concrete reinforced by assorted fiber and preparation method thereof |
| CN106278026A (en) * | 2016-08-09 | 2017-01-04 | 郑州大学 | A kind of cement-base composite material and preparation method thereof |
| CN106478024B (en) * | 2016-10-12 | 2019-03-01 | 河北拓创远威科技有限公司 | A kind of high ductility, high-adhesion cement base reinforcing and repairing material and preparation method thereof |
| CN106478024A (en) * | 2016-10-12 | 2017-03-08 | 北京工业大学 | A kind of high ductility, high-adhesion cement based reinforcing and repairing material and preparation method thereof |
| CN107285714A (en) * | 2017-07-31 | 2017-10-24 | 北京中震建筑科学研究院有限公司 | A kind of high ductility vinal concrete and preparation method thereof |
| CN110606702A (en) * | 2019-08-28 | 2019-12-24 | 维特国际新材料（武汉）有限公司 | Bridge self-repairing paving method based on cement-based composite material |
| CN110498649A (en) * | 2019-09-02 | 2019-11-26 | 东南大学 | A kind of low-shrinkage cement-based repair material and preparation method thereof |
| CN110498649B (en) * | 2019-09-02 | 2022-08-30 | 东南大学 | Low-shrinkage cement-based repair material and preparation method thereof |
| CN112341099A (en) * | 2020-11-23 | 2021-02-09 | 交通运输部天津水运工程科学研究所 | High-ductility repair mortar with self-healing function and preparation method thereof |
| CN114163192A (en) * | 2021-12-13 | 2022-03-11 | 内蒙古工业大学 | A kind of antifreeze and high ductility composite material and its preparation method and application |
| CN114014615A (en) * | 2021-12-22 | 2022-02-08 | 山东铁壁虎建材有限公司 | Concrete rapid repair material with super early strength, low shrinkage and high ductility and preparation method thereof |
| CN114591044A (en) * | 2022-01-26 | 2022-06-07 | 北京固斯特国际化工有限公司 | Salt-resistant, reinforcing, repairing, corrosion-resistant and anti-permeability coating for concrete structure of seawater cooling tower and application thereof |
| CN115745536A (en) * | 2022-12-16 | 2023-03-07 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared by calcining coal gangue powder and method |
| CN115745536B (en) * | 2022-12-16 | 2023-12-22 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared from calcined gangue powder and method |
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