CN104944824B - A kind of cement concrete early strength agent and early strength water-reducing agent - Google Patents
A kind of cement concrete early strength agent and early strength water-reducing agent Download PDFInfo
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Abstract
本发明涉及一种水泥混凝土早强剂，所述早强剂含有纳米碳酸钙和轻钙粉，优选的，所述早强剂还含有甲酸钙、硝酸钙中的一种或两种。所述早强剂中各组分及质量份数如下：纳米碳酸钙20～67份；轻钙粉33～80份；甲酸钙0～10份；硝酸钙0～10份。本发明涉及的早强剂与现有早强剂相比，其最大的优点是不引入有害离子，对使用的环境无污染，无毒无害，并且同样可以提高水泥混凝土早期强度，缩短混凝土的初凝和终凝时间。本发明还涉及一种含有所述早强剂的早强减水剂，所述早强减水剂各组分及质量百分比如下：早强组分60％～75％；减水组分25％～40％，该早强减水剂具有很好的早强、减水、增强作用，减水率大，能显著提高混凝土的早期强度，不影响后期强度。The invention relates to a cement concrete early strength agent. The early strength agent contains nano calcium carbonate and light calcium powder. Preferably, the early strength agent also contains one or both of calcium formate and calcium nitrate. The components and parts by mass in the early strength agent are as follows: 20-67 parts of nano-calcium carbonate; 33-80 parts of light calcium powder; 0-10 parts of calcium formate; 0-10 parts of calcium nitrate. Compared with the existing early strength agents, the early strength agent involved in the present invention has the biggest advantage of not introducing harmful ions, no pollution to the environment used, non-toxic and harmless, and can also increase the early strength of cement concrete and shorten the concrete life. Initial and final setting times. The present invention also relates to an early-strength water-reducer containing the early-strength agent. The components and mass percentages of the early-strength water-reducer are as follows: 60% to 75% of the early-strength component; 25% of the water-reducing component ~40%, the early-strength superplasticizer has good early-strength, water-reducing, and reinforcing effects, and the water-reducing rate is large, which can significantly improve the early strength of concrete without affecting the later strength.
Description
技术领域technical field
本发明属于建筑材料技术领域，涉及一种水泥混凝土早强剂和早强减水剂。The invention belongs to the technical field of building materials, and relates to a cement concrete early-strength agent and an early-strength water reducer.
背景技术Background technique
混凝土早强剂是指能提高混凝土早期强度的外加剂，多在冬季施工或者紧急抢修时采用，目前我国较为常用的混凝土早强剂主要有氯盐系、硫酸盐系、碳酸盐系、有机物系、矿物类及复合早强剂，最常用的几类主要包括：Concrete early strength agent refers to the admixture that can improve the early strength of concrete. It is mostly used in winter construction or emergency repair. At present, the more commonly used concrete early strength agents in my country mainly include chloride salts, sulfates, carbonates, and organic compounds. Series, minerals and compound early strength agents, the most commonly used types mainly include:
(1)氯盐类早强剂：主要有氯化钙、氯化钠、氯化钾、氧化胺、氧化铁、氧化铝等,氯盐类早强剂均有良好的早强作用,其中氯化钙早强效果好而且成本低,应用最广。(1) Chloride salt early strength agents: mainly calcium chloride, sodium chloride, potassium chloride, amine oxide, iron oxide, aluminum oxide, etc. Chloride salt early strength agents have good early strength effects, among which chlorine Calcium early strength has good effect and low cost, so it is the most widely used.
(2)硫酸盐类早强剂：主要有硫酸钠(即元明粉)、硫代硫酸钠、硫酸钙、硫酸铝、硫酸铝钾等。其中硫酸钠应用较多。(2) Sulfate-based early strength agents: mainly sodium sulfate (namely, sodium sulfate), sodium thiosulfate, calcium sulfate, aluminum sulfate, potassium aluminum sulfate, etc. Among them, sodium sulfate is used more.
(3)有机物类早强剂：有机胺类早强剂主要有三乙醇胺(简称TEA)、三异丙醇胺(简称T P)、二乙醇胺等,其中早强效果以三乙醇胺为佳。(3) Organic early strength agents: Organic amine early strength agents mainly include triethanolamine (abbreviated as TEA), triisopropanolamine (abbreviated as TP), diethanolamine, etc. Among them, triethanolamine has the best early strength effect.
工程中以上几类早强剂可单掺或复配。氯盐系早强剂对钢筋有明显的锈蚀作用,因此氯化物系早强剂应用已很少。硫酸盐系早强剂也由于引起混凝土“泛霜”，以及存在碱骨料反应危害风险，其应用也受到很大的限制。其它一些种类早强剂,或存在着早强效果不佳,或影响后期强度,或存在原料来源，困难生产成本高等问题。In engineering, the above types of early strength agents can be mixed alone or compounded. Chloride-based early strength agents have obvious corrosion effects on steel bars, so chloride-based early-strength agents are rarely used. The application of sulfate-based accelerators is also greatly restricted due to the "flooding" of concrete and the risk of alkali-aggregate reaction hazards. Some other types of early strength agents have problems such as poor early strength effect, or affecting later strength, or raw material sources, difficult production costs and high costs.
对于建筑材料技术领域有必要开发出新的早强剂种类以避免现有技术中所存在的缺陷。For the technical field of building materials, it is necessary to develop new types of accelerators to avoid the defects in the prior art.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种水泥混凝土早强剂，该早强剂可以提高水泥混凝土的早期强度，不降低后期强度，并且不含有害离子，不会增加发生碱骨料反应及钢筋锈蚀危害；本发明的另一目的在于提供一种以该早强剂为主要组份的早强减水剂，该早强减水剂具有很好的早强、减水、增强作用，减水率大，能显著提高混凝土的早期和后期强度。In view of this, the purpose of the present invention is to provide a kind of early strength agent for cement concrete, this early strength agent can improve the early strength of cement concrete, does not reduce the later stage strength, and does not contain harmful ions, can not increase the occurrence of alkali aggregate reaction and steel bar corrosion hazard; another object of the present invention is to provide a kind of early-strength water reducer with the early-strength agent as the main component, the early-strength water-reducer has good early-strength, water-reducing, strengthening effects High water rate can significantly improve the early and late strength of concrete.
为达到上述目的，本发明提供如下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种水泥混凝土早强剂，所述早强剂含有纳米碳酸钙和轻钙粉。An early strength agent for cement concrete, the early strength agent contains nanometer calcium carbonate and light calcium powder.
优选的，所述早强剂还含有甲酸钙、硝酸钙中的一种或两种。Preferably, the accelerator also contains one or both of calcium formate and calcium nitrate.
优选的，所述早强剂中各组分及质量份数如下：Preferably, each component and mass parts in the described early strengthening agent are as follows:
优选的，所述早强剂中各组分及质量份数如下：Preferably, each component and mass parts in the described early strengthening agent are as follows:
纳米碳酸钙 62份；62 parts of nano calcium carbonate;
轻钙粉 33份；33 parts of light calcium powder;
甲酸钙 5份。Calcium formate 5 parts.
一种早强减水剂，所述早强减水剂含有所述水泥混凝土早强剂。An early-strength water-reducer, the early-strength water-reducer contains the cement concrete early-strength agent.
优选的，所述早强减水剂中各组分及质量百分比如下：Preferably, the components and mass percentages of the early-strength superplasticizer are as follows:
早强组分 60％～75％；Early strength component 60% to 75%;
减水组分 25％～40％。Reduce water components by 25% to 40%.
所述减水组份为萘系减水剂或聚羧酸系减水剂。The water-reducing component is a naphthalene-based water-reducer or a polycarboxylate-based water-reducer.
纳米碳酸钙可以提高水泥混凝土的早期强度其原理有以下几方面：首先，纳米碳酸钙可以起到超细微集料的作用，填充水泥熟料颗粒周围的空隙，使结构变得更加密实从而提高强度；其次，由于纳米粒子的表面效应，水化硅酸钙凝胶可以以纳米碳酸钙为晶核生长，从而可以使水化硅酸钙凝胶以纳米碳酸钙为核心发展成网状结构，使水泥混凝土内部更加密实，从而提高强度；再次，纳米碳酸钙可以明显降低Ca(OH)2在界面处的密集分布和定向排列，有助于改善界面的综合性能；最后，纳米碳酸钙可以促进C3A与石膏反应生成钙矾石，钙矾石再与纳米碳酸钙反应生成碳铝酸钙也是早期强度提高的原因之一。而在早强组分中引入轻钙粉则会进一步提高水泥混凝土的密实程度从而提高水泥混凝土的早期强度。Nano-calcium carbonate can improve the early strength of cement concrete. The principle has the following aspects: First, nano-calcium carbonate can play the role of ultra-fine aggregate, filling the gaps around the cement clinker particles, making the structure more compact and increasing the strength. Secondly, due to the surface effect of nanoparticles, calcium silicate hydrate gel can grow with nano-calcium carbonate as the crystal nucleus, so that calcium silicate hydrate gel can develop into a network structure with nano-calcium carbonate as the core, so that The interior of cement concrete is denser, thereby improving the strength; again, nano-calcium carbonate can significantly reduce the dense distribution and orientation of Ca(OH) 2 at the interface, which helps to improve the comprehensive performance of the interface; finally, nano-calcium carbonate can promote C 3 A reacts with gypsum to form ettringite, and then reacts with nano calcium carbonate to form calcium carbonoaluminate, which is also one of the reasons for the early strength increase. The introduction of light calcium powder in the early strength component will further increase the compactness of cement concrete and thus improve the early strength of cement concrete.
本发明的有益效果在于：本发明所公开的早强剂组份中不含现有技术早强剂中一些有害离子，避免了现有技术中的早强剂对钢筋的锈蚀作用或者引起混凝土“泛霜效应”，并且由本发明所公开的早强剂可以提高水泥混凝土早期强度，缩短混凝土的初凝和终凝时间，提高施工效率，并且相比于现有技术中各种类别早强剂其早强性能不减弱。The beneficial effect of the present invention is that: the early strength agent component disclosed by the present invention does not contain some harmful ions in the prior art early strength agent, avoiding the corrosion effect of the prior art accelerator on the steel bar or causing concrete " Blooming effect", and the early strength of cement concrete can be improved by the early strength agent disclosed by the present invention, the initial setting and final setting time of concrete can be shortened, and the construction efficiency can be improved, and compared with various types of early strength agents in the prior art, its The early strength performance is not weakened.
具体实施方式detailed description
下面对本发明的优选实施例进行详细的描述。Preferred embodiments of the present invention are described in detail below.
实施例1Example 1
一种早强剂，其组分及质量份数为：纳米碳酸钙62份；轻钙粉33份；甲酸钙5份。An early strength agent, its components and mass parts are: 62 parts of nano calcium carbonate; 33 parts of light calcium powder; 5 parts of calcium formate.
按上述各组份及质量份数将其混合均匀，并保持干燥，将早强剂和水混合，再将其加入至水泥混凝土中，加入的早强剂与水泥混凝土中水泥的质量比为1:100。Mix them evenly according to the above-mentioned components and parts by mass, keep dry, mix the accelerator and water, and then add it to the cement concrete, the mass ratio of the added accelerator to the cement in the cement concrete is 1 :100.
实施例2Example 2
一种早强剂，其组份及质量份数为：纳米碳酸钙48份；轻钙粉48份；硝酸钙4份。An early strength agent, its components and mass parts are: 48 parts of nano calcium carbonate; 48 parts of light calcium powder; 4 parts of calcium nitrate.
按上述各组份及质量份数将其混合均匀，并保持干燥，将早强剂和水混合，再将其加入至水泥混凝土中，加入的早强剂与水泥混凝土中水泥的质量比为1:100。Mix them evenly according to the above-mentioned components and parts by mass, keep dry, mix the accelerator and water, and then add it to the cement concrete, the mass ratio of the added accelerator to the cement in the cement concrete is 1 :100.
实施例3Example 3
一种早强剂，其组份及质量份数为：纳米碳酸钙32份；轻钙粉65份；硝酸钙3份。An early strength agent, its components and mass parts are: 32 parts of nano calcium carbonate; 65 parts of light calcium powder; 3 parts of calcium nitrate.
按上述各组份及质量份数将其混合均匀，并保持干燥，将早强剂和水混合，再将其加入至水泥混凝土中，加入的早强剂与水泥混凝土中水泥的质量比为1:100。Mix them evenly according to the above-mentioned components and parts by mass, keep dry, mix the accelerator and water, and then add it to the cement concrete, the mass ratio of the added accelerator to the cement in the cement concrete is 1 :100.
实施例4Example 4
一种早强减水剂，其组份及质量百分比为：纳米碳酸钙31％；轻钙粉32％；甲酸钙4％；聚羧酸系高效减水剂33％。An early-strength water reducer, its components and mass percentages are: 31% of nano calcium carbonate; 32% of light calcium powder; 4% of calcium formate; 33% of polycarboxylate high-efficiency water reducer.
将上述各组分按质量百分比称重，将该早强剂早强组分分散在含有聚羧酸系高效减水剂的水溶液中，搅拌均匀，加入水泥混凝土中，加入的早强减水剂与水泥混凝土中水泥的质量比为1.5：100。Weigh the above-mentioned components by mass percentage, disperse the early-strength agent early-strength component in the aqueous solution containing polycarboxylate high-efficiency water-reducer, stir evenly, add it to cement concrete, and add the early-strength water-reducer The mass ratio of cement to cement concrete is 1.5:100.
实施例5Example 5
一种早强减水剂，其组份及质量百分比为：纳米碳酸钙30％；轻钙粉30％；甲酸钙4％；硝酸钙3％；聚羧酸系高效减水剂33％。An early-strength water reducer, its components and mass percentages are: 30% of nano calcium carbonate; 30% of light calcium powder; 4% of calcium formate; 3% of calcium nitrate;
将上述各组分按质量百分比称重，将该早强剂早强组分分散在含有萘系高效减水剂的水溶液中，搅拌均匀，加入水泥混凝土中，加入的早强减水剂与水泥混凝土中水泥的质量比为1.5：100。Weigh the above-mentioned components by mass percentage, disperse the early-strength agent early-strength component in the aqueous solution containing naphthalene-based high-efficiency superplasticizer, stir evenly, add it to cement concrete, and add the early-strength superplasticizer and cement The mass ratio of cement in concrete is 1.5:100.
实施例6Example 6
一种早强减水剂，其组份及质量百分比为：纳米碳酸钙33％；轻钙粉33％；聚羧酸系高效减水剂34％。An early-strength water reducer, its components and mass percentages are: 33% of nano-calcium carbonate; 33% of light calcium powder; 34% of polycarboxylic acid-based high-efficiency water reducer.
将上述各组分按质量百分比称重，将该早强剂早强组分分散在含有聚羧酸系高效减水剂的水溶液中，搅拌均匀，加入水泥混凝土中，加入的早强减水剂与水泥混凝土中水泥的质量比为1.5：100。Weigh the above-mentioned components by mass percentage, disperse the early-strength agent early-strength component in the aqueous solution containing polycarboxylate high-efficiency water-reducer, stir evenly, add it to cement concrete, and add the early-strength water-reducer The mass ratio of cement to cement concrete is 1.5:100.
上述水泥混凝土中水与水泥的质量比为0.3，按实施例4，5，6所制得的含有早强减水剂的水泥砂浆，按照GB/T 17671-1999测试胶砂强度，空白代表没有掺入早强剂，并与掺入氯化钙的一组进行对比，测量值如下表1：The mass ratio of water to cement in the above-mentioned cement concrete is 0.3, and the cement mortar containing early-strength water-reducer prepared according to Examples 4, 5, and 6 is tested for mortar strength according to GB/T 17671-1999, and the blank represents no Incorporate the early strength agent, and compare with a group of incorporation of calcium chloride, the measured values are as follows in Table 1:
表1 测试胶砂强度的对比试验结果Table 1 Comparative test results for testing the strength of mortar
从表1可看出，采用实施例4、5、6制备的早强减水剂与采用现有技术中的含有氯化钙组的早强减水剂在1天龄期可实现的混凝土抗折抗压强度基本相同，在3天、7天、28天龄期时，实施例4，5，6制备的早强减水剂可实现的混凝土抗折抗压强度比含有氯化钙组的早强减水剂效果还要好，并且与空白组对比，其效果更加明显。这说明本发明所公开的早强剂组份中不仅避免了含有现有技术早强剂中一些有害离子对钢筋的锈蚀作用或者引起混凝土“泛霜效应”，并且由本发明所公开的早强剂可以提高水泥混凝土早期强度，缩短混凝土的初凝和终凝时间，提高施工效率，并且相比于现有技术中早强剂其早强性能不减弱反而有更好的效果。As can be seen from Table 1, the early-strength water-reducing agent prepared in Examples 4, 5, and 6 is the same as the early-strength water-reducing agent containing calcium chloride group in the prior art. The flexural compressive strength is basically the same. At the age of 3 days, 7 days, and 28 days, the concrete flexural compressive strength that can be achieved by the early-strength water-reducing agent prepared in Examples 4, 5, and 6 is higher than that of the concrete containing calcium chloride group. The effect of the early-strength water reducer is even better, and compared with the blank group, its effect is more obvious. This illustrates that in the accelerator component disclosed by the present invention, not only has avoided containing some harmful ions in the accelerator of the prior art to corrode the steel bar or cause concrete "blooming effect", and by the accelerator disclosed by the present invention It can improve the early strength of cement concrete, shorten the initial setting and final setting time of concrete, and improve construction efficiency. Compared with the early strength agent in the prior art, its early strength performance is not weakened but has a better effect.
最后说明的是，以上优选实施例仅用以说明本发明的技术方案而非限制，尽管通过上述优选实施例已经对本发明进行了详细的描述，但本领域技术人员应当理解，可以在形式上和细节上对其作出各种各样的改变，而不偏离本发明权利要求书所限定的范围。Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.
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| CN109250979A (en) * | 2018-08-21 | 2019-01-22 | 苏州混凝土水泥制品研究院有限公司 | It is a kind of for the composition of super high-early concrete prefabricated component and its super high-early concrete prefabricated component of preparation |
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| CN109485291A (en) * | 2019-01-07 | 2019-03-19 | 山西佳维新材料股份有限公司 | A kind of early diminishing complexing agent and preparation method thereof by force of novel poly-carboxylic high-performance nanometer seed crystal |
| CN110683785B (en) * | 2019-11-14 | 2021-10-22 | 江苏博思通新材料有限公司 | Concrete crystal nucleus early strength agent |
| CN113429170B (en) * | 2021-08-25 | 2021-11-12 | 奥王建筑材料科技有限公司 | Anti-crack type construction waste recycled concrete wallboard |
| CN113912322A (en) * | 2021-10-21 | 2022-01-11 | 杭州构建新型材料有限公司 | Early-strength crystal nucleus type polycarboxylate superplasticizer and production method thereof |
| CN113880491B (en) * | 2021-11-11 | 2023-06-13 | 吉林省黄腾建材有限公司 | Early strength agent for concrete |
| CN116573882B (en) * | 2023-04-03 | 2025-02-28 | 辽宁省交通规划设计院有限责任公司 | A concrete setting accelerator and early strength agent and its preparation method and application |
| CN118290062B (en) * | 2024-05-29 | 2024-08-02 | 石家庄市长安育才建材有限公司 | Nano hydrated calcium carbonate aluminate early strength agent and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403249A (en) * | 2008-11-17 | 2009-04-08 | 金勇云 | Anti-crack type energy-saving covering layer used for building exterior wall surface |
| CN102432254B (en) * | 2011-09-29 | 2013-09-04 | 成都嘉新科技集团有限公司 | Gravity filling mortar |
| CN102491671B (en) * | 2011-11-18 | 2013-02-27 | 大连科诺科技发展有限公司 | Concrete nano water reducing super early strength agent |
| KR101360261B1 (en) * | 2013-11-19 | 2014-02-11 | 임성호 | Manufacturing method of light weight bubble cement using composition of light weight bubble cement |
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