CN101905964A - 一种高强度蒸压加气混凝土的制备方法 - Google Patents
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
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- 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
- C04B2/00—Lime, magnesia or dolomite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
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- 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
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0004—Compounds chosen for the nature of their cations
- C04B2103/001—Alkaline earth metal or Mg-compounds
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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Abstract
本发明公开了一种高强度蒸压加气混凝土的制备方法。包括以下步骤：首先采用碳化反应器生成纳米碳酸钙乳液，经脱水处理后形成含水率为40％～60％的纳米碳酸钙浆体；然后在混凝土料浆中掺入干质量占干料总质量1％的纳米碳酸钙浆体，经混合搅拌、浇注发气、静停切割、蒸压养护后成型。抗压强度测试表明，掺入纳米碳酸钙的蒸压加气混凝土成品的抗压强度比未掺入纳米碳酸钙的基准试件的抗压强度显著提高。本发明通过在蒸压加气混凝土料浆中掺入纳米碳酸钙浆体，利用纳米碳酸钙的微集料效应，能改善和增强制品的结构强度，提高均质性和致密性；同时纳米碳酸钙颗粒能起到晶核的作用，可提高托勃莫来石的结晶度，从而进一步提高制品的宏观强度。
Description
技术领域
本发明涉及纳米材料领域，混凝土制备领域，尤其涉及一种高强度蒸压加气混凝土的制备方法。
技术背景
随着环境保护与可持续发展越来越成为当今建筑业的热点问题，集轻质、高强、保温隔热等优点为一体的蒸压加气混凝土作为一种轻质墙体材料再一次受到人们的关注。然而，蒸压加气混凝土本身特有的多孔结构使其存在强度较低的问题，严重影响了建筑物的感观质量和使用功能，不利于该材料的进一步发展。从目前研究应用的现状来看，蒸压加气混凝土的强度还有较大的提升空间。因此，必须研究如何提高蒸压加气混凝土的强度，以进一步推广蒸压加气混凝土的应用。
混凝土的各项性能和其内部的孔隙结构有十分密切的关系。目前，已经有采用各种超细颗粒填充混凝土内部孔隙，从而提高混凝土力学性能和耐久性能的方法，如硅灰、纳米二氧化硅等。然而硅灰的颗粒较大，填充效果一般；而纳米二氧化硅价格昂贵，不利于其在混凝土工程的广泛使用。
发明内容
本发明的目的是克服现有技术的不足，提供一种高强度蒸压加气混凝土的制备方法。
本发明解决其技术问题采用的技术方案如下：
1.首先采用碳化反应器生成纳米碳酸钙乳液，经脱水处理后形成含水率为40％～60％的纳米碳酸钙浆体；
2.在蒸压加气混凝土料浆中掺入干质量占干料质量百分数1％的纳米碳酸钙浆体，经混合搅拌、浇注发气、静停切割、蒸压养护后成型。
本发明与背景技术相比，具有的有益的效果是：纳米碳酸钙的微细颗粒均匀分布在水泥浆内，可起到填充孔隙和毛细孔，改善混凝土孔结构和增大密实度的作用，即微集料效应。碳酸钙微粒在浆体中分散状态良好，它有助于硬化混凝土均匀性的改善，也有助于混凝土中孔隙和毛细孔的充填和“细化”，能明显地改善和增强混凝土及制品的结构强度，提高匀质性和致密性。同时，纳米碳酸钙颗粒还能起到晶核的作用，提高托勃莫来石的结晶度，进一步提高制品的宏观强度。有研究表明，纳米碳酸钙在水泥浆的水化过程中参与水化反应，生成高碳性水化碳铝酸钙和低碳性水化碳铝酸钙，其临界水灰比分别为在0.98和0.54，远远高于硅酸盐水泥的临界水灰比0.23，使得结构密实，混凝土抗渗性能提高。
具体实施方式
在本发明中，提高蒸压加气混凝土抗压强度的实施方式：首先采用碳化反应器生成纳米碳酸钙乳液，经脱水处理后形成含水率为40％～60％的纳米碳酸钙浆体；然后在蒸压加气混凝土料浆中掺入干质量占干料质量百分数1％的纳米碳酸钙浆体，加水配比进行搅拌，浇筑在模具内后进入静养室，施加高温。在此时间内，原料中的铝粉在高温条件下发生化学反应，浇筑的泥浆在模具内开始初凝、发泡、膨胀。成型后按照规格要求进行切割，将其送入蒸压釜进行蒸气养护后成型。
实施例1：将水泥、石灰、石膏、砂、水按设定的配合比一次性投入搅拌机搅拌，加入外加剂与碳酸钙浆体及铝粉后继续搅拌，浇注入模，静停2h后入釜蒸压10h，出釜拆模。混凝土每组成型3个，养护至规定龄期，分别测试立方体抗压强度。与不掺纳米碳酸钙的基准试件相比，掺入纳米碳酸钙的蒸压加气混凝土成品的1天抗压强度提高了30.3％，7天抗压强度提高了21.1％。
Claims (2)
1.一种高强度蒸压加气混凝土的制备方法，其特征在于包括以下步骤：
1)首先采用碳化反应器生成纳米碳酸钙乳液，经脱水处理后形成含水率为40％～60％的纳米碳酸钙浆体；
2)在蒸压加气混凝土料浆中掺入干质量占干料质量百分数1％的纳米碳酸钙浆体，经混合搅拌、浇注发气、静停切割、蒸压养护后成型。
2.根据权利要求1所述的一种高强度蒸压加气混凝土的制备方法，其特征在于：料浆组分为水泥、石灰、石膏、砂、铝粉、外加剂、水；搅拌顺序为：将水泥、石灰、石膏、砂、水按设定的配合比一次性投入搅拌机搅拌，加入外加剂与碳酸钙浆体及铝粉后继续搅拌一定时间后浇注入模。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2824086B1 (de) * | 2013-07-12 | 2016-11-09 | Xella Baustoffe GmbH | Hydrothermal gehärtetes Poren- oder Schaumbetonmaterial sowie Verfahren zu dessen Herstellung |
| CN106769449A (zh) * | 2016-11-28 | 2017-05-31 | 广州市建筑材料工业研究所有限公司 | 一种现场蒸压加气混凝土砌块强度快速检测的方法 |
| CN107032734A (zh) * | 2017-03-27 | 2017-08-11 | 浙江大学 | 一种纳米改性高抗渗混凝土的制备方法 |
| CN110981259A (zh) * | 2019-12-16 | 2020-04-10 | 河海大学 | 一种提高水热合成水化硅酸钙结晶度的外加剂 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2824086B1 (de) * | 2013-07-12 | 2016-11-09 | Xella Baustoffe GmbH | Hydrothermal gehärtetes Poren- oder Schaumbetonmaterial sowie Verfahren zu dessen Herstellung |
| EP3100991A1 (de) | 2013-07-12 | 2016-12-07 | Xella Baustoffe GmbH | Verfahren zur herstellung eines hydrothermal gehärteten poren- oder schaumbetonformkörpers |
| EP3100991B1 (de) | 2013-07-12 | 2017-09-13 | Xella Baustoffe GmbH | Verfahren zur herstellung eines hydrothermal gehärteten poren- oder schaumbetonformkörpers |
| CN106769449A (zh) * | 2016-11-28 | 2017-05-31 | 广州市建筑材料工业研究所有限公司 | 一种现场蒸压加气混凝土砌块强度快速检测的方法 |
| CN106769449B (zh) * | 2016-11-28 | 2020-04-07 | 广州市建筑材料工业研究所有限公司 | 一种现场蒸压加气混凝土砌块强度快速检测的方法 |
| CN107032734A (zh) * | 2017-03-27 | 2017-08-11 | 浙江大学 | 一种纳米改性高抗渗混凝土的制备方法 |
| CN110981259A (zh) * | 2019-12-16 | 2020-04-10 | 河海大学 | 一种提高水热合成水化硅酸钙结晶度的外加剂 |
| CN110981259B (zh) * | 2019-12-16 | 2021-05-28 | 河海大学 | 一种提高水热合成水化硅酸钙结晶度的外加剂 |
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