CN114133202A - 一种钢筋连接用低温型套筒灌浆材料 - Google Patents
一种钢筋连接用低温型套筒灌浆材料 Download PDFInfo
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- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 8
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- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical group [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 7
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 2
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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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
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Abstract
本发明公开了一种钢筋连接用低温型套筒灌浆材料，按重量份数计包括硅酸盐525水泥700–900份、高铝725水泥100–300份、无水石膏50–100份、硅灰25–50份、粗砂200–500份、中砂200–400份、细砂200–400份、超细砂100–300份、减水剂1–3份、流变稳定剂0.1–0.5份、消泡剂0.3–1.6份、塑性膨胀剂0.1–0.5份、缓凝剂0.5–1.5份、早强剂0.5–1.5份、防冻剂0.5–2份和水200–280份。本发明的套筒灌浆材料装配式冬季施工时初始及半小时施工性能良好，达到强度和施工性能的基础上不出现早期塑性开裂和后期收缩开裂，满足构件灌浆连接施工要求。
Description
技术领域
本发明属于混凝土领域，具体涉及一种钢筋连接用低温型套筒灌浆材料。
背景技术
随着装配式建筑项目的不断推广，我国各地区新开项目优先采用装配式建筑施工工艺，但由于我国特有的地形气候导致全国大部分地区冬季持续时间较长，其中华北地区冬季通常持续3–4个月，最低温度–10℃。与混凝土工程相比，装配式建筑中灌浆料在套筒中的厚度不足10mm，体积不足0.2L，冬期施工时基本无法靠自身水化热保证较高的养护温度。为此，一些在低负温条件下施工的建筑就必须对套筒进行保温加热处理，但采用蓄热保温或者外部热源加热提高灌浆料养护温度存在困难，需要耗费大量的人力、物力。目前，市场上的套筒灌浆料主要为硅酸盐灌浆料，但其低温时强度发展缓慢，甚至在负温时终止水化，用于冬期施工时存在很大局限性。
发明内容
为解决钢筋连接用套筒灌浆材料在低温下强度发展缓慢甚至终止水化的问题，本发明的目的在于提供一种钢筋连接用低温型套筒灌浆材料，在保证强度的前提下初始流动高，半小时保留值满足施工要求，保证灌浆施工操作性能的同时满足强度达标、膨胀率的性能要求。
本发明的上述目的通过以下技术方案实现：
本发明提供的一种钢筋连接用低温型套筒灌浆材料，原料包括胶凝材料、骨料、外加剂和水，按重量份数计：
所述胶凝材料包括硅酸盐525水泥700–900份、高铝725水泥100–300份、无水石膏50–100份、硅灰25–50份；
所述骨料包括粗砂200–500份、中砂200–400份、细砂200–400份、超细砂100–300份；
所述外加剂包括减水剂1–3份、流变稳定剂0.1–0.5份、消泡剂0.3–1.6份、塑性膨胀剂0.1–0.5份、缓凝剂0.5–1.5份、早强剂0.5–1.5份、防冻剂0.5–2份；
水200–280份。
优选地，所述无水石膏占所述胶凝材料用量的5％–10％，可延缓钢筋连接用低温型套筒灌浆材料在温度为-5℃至8℃的凝结时间。
优选地，所述骨料中粗砂、中砂、细沙和超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
更优选地，所述粗砂、中砂、细沙和超细砂的质量比为2：4：3：1。
优选地，所述减水剂为高性能聚羧酸减水剂，可保证钢筋连接用低温型套筒灌浆材料在温度为-5℃至8℃的初始流动性。
优选地，所述缓凝剂选自酒石酸缓凝剂、葡萄糖酸钠缓凝剂、硼酸缓凝剂中的一种或两种以上组合，可钢筋连接用低温型套筒灌浆材料在温度为-5℃至8℃下的半小时流动性。
优选地，所述早强剂为碳酸锂早强剂，可保证钢筋连接用低温型套筒灌浆材料在温度为-5℃至8℃的早期强度及水化热。
优选地，所述防冻剂为甲酸钙防冻剂，可保证钢筋连接用低温型套筒灌浆材料在温度为-5℃至8℃的后期强度。
与现有技术相比，本发明的有益效果在于：
(1)本发明的钢筋连接用低温型套筒灌浆材料在-5℃至8℃装配式冬季施工时可以保证构件灌浆连接正常施工，材料初始及半小时施工性能良好，早期强度高，后期强度仍有增长，早期强度和后期强度满足施工要求。
(2)本发明通过添加特殊组成和比例的外加剂，在满足强度和施工性能的基础上，可以保证材料不出现早期塑性开裂和后期收缩开裂，满足灌浆施工要求。
附图说明
图1是实施例中制备的钢筋连接用低温型套筒灌浆材料试样流动度测试。
图2是实施例中制备的钢筋连接用低温型套筒灌浆材料试样强度测试。
具体实施方式
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。
实施例1
按如下重量份数的原料混合制备钢筋连接用低温型套筒灌浆材料，具体为：胶凝材料包括硅酸盐525水泥700份、高铝725水泥275份、无水石膏50份和硅灰25份，骨料包括粗砂200份、中砂400份、细砂300份和超细砂100份，外加剂包括高性能聚羧酸减水剂3份、流变稳定剂0.5份、消泡剂0.6份、塑性膨胀剂0.2份、酒石酸缓凝剂1.5份、碳酸锂早强剂1份和甲酸钙防冻剂2份，水220份；其中，粗砂、中砂、细沙、超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
实施例2
按如下重量份数的原料混合制备钢筋连接用低温型套筒灌浆材料，具体为：胶凝材料包括硅酸盐525水泥750份、高铝725水泥225份、无水石膏60份和硅灰25份，骨料包括粗砂200份、中砂400份、细砂300份和超细砂100份，外加剂包括高性能聚羧酸减水剂3份、流变稳定剂0.5份、消泡剂0.6份、塑性膨胀剂0.2份、葡萄糖酸钠缓凝剂1.5份、碳酸锂早强剂1份和甲酸钙防冻剂2份，水220份；其中，粗砂、中砂、细沙、超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
实施例3
按如下重量份数的原料混合制备钢筋连接用低温型套筒灌浆材料，具体为：胶凝材料包括硅酸盐525水泥800份、高铝725水泥175份、无水石膏70份和硅灰25份，骨料包括粗砂200份、中砂400份、细砂300份和超细砂100份，外加剂包括高性能聚羧酸减水剂3份、流变稳定剂0.5份、消泡剂0.6份、塑性膨胀剂0.2份、硼酸缓凝剂1.5份、碳酸锂早强剂1份和甲酸钙防冻剂2份，水220份；其中，粗砂、中砂、细沙、超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
实施例4
按如下重量份数的原料混合制备钢筋连接用低温型套筒灌浆材料，具体为：胶凝材料包括硅酸盐525水泥850份、高铝725水泥125份、无水石膏80份和硅灰25份，骨料包括粗砂200份、中砂400份、细砂300份和超细砂100份，外加剂包括高性能聚羧酸减水剂3份、流变稳定剂0.5份、消泡剂0.6份、塑性膨胀剂0.2份、硼酸缓凝剂1份、碳酸锂早强剂1.5份和甲酸钙防冻剂2份，水220份；其中，粗砂、中砂、细沙、超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
实施例5
按如下重量份数的原料混合制备钢筋连接用低温型套筒灌浆材料，具体为：胶凝材料包括硅酸盐525水泥900份、高铝725水泥100份、无水石膏90份和硅灰25份，骨料包括粗砂200份、中砂400份、细砂300份和超细砂100份，外加剂包括高性能聚羧酸减水剂3份、流变稳定剂0.5份、消泡剂0.6份、塑性膨胀剂0.2份、硼酸缓凝剂1份、碳酸锂早强剂1.5份和甲酸钙防冻剂2份，水220份；其中，粗砂、中砂、细沙、超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
实施例1–5得到的钢筋连接用低温型套筒灌浆材料施工状态性能测试如表1和图1所示，果，物理性能测试如表2和图2所示。
表1
| 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 | |
| 初始流动度 | 340 | 345 | 330 | 320 | 320 |
| 30min流动度 | 300 | 300 | 290 | 280 | 280 |
表2
| 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 | |
| 1天抗压强度/MPa | 65.5 | 63.7 | 62.1 | 57.1 | 55.5 |
| 3天抗压强度/MPa | 80.5 | 77.4 | 76.7 | 75.9 | 73.1 |
| 7–21天抗压强度/MPa | 93.1 | 90.4 | 89.1 | 88.4 | 88.7 |
| 3h竖向膨胀率 | 0.235 | 0.245 | 0.231 | 0.237 | 0.235 |
| 24h与3h竖向膨胀率差值 | 0.112 | 0.179 | 0.105 | 0.114 | 0.113 |
Claims (8)
1.一种钢筋连接用低温型套筒灌浆材料，其特征在于，原料包括胶凝材料、骨料、外加剂和水，按重量份数计：
所述胶凝材料包括硅酸盐525水泥700–900份、高铝725水泥100–300份、无水石膏20–100份和硅灰25–50份；
所述骨料包括粗砂200–500份、中砂200–400份、细砂200–400份和超细砂100–300份；
所述外加剂包括减水剂1–3份、流变稳定剂0.1–0.5份、消泡剂0.3–1.6份、塑性膨胀剂0.1–0.5份、缓凝剂0.5–1.5份、早强剂0.5–1.5份和防冻剂0.5–2份；
水200–280份。
2.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述无水石膏占所述胶凝材料用量的5％–10％。
3.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述骨料中粗砂、中砂、细沙和超细砂的粒径分别为8–20目、20–40目、40–70目和70–100目。
4.根据权利要求3所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述粗砂、中砂、细沙和超细砂的质量比为2：4：3：1。
5.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述减水剂为高性能聚羧酸减水剂。
6.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述缓凝剂选自酒石酸缓凝剂、葡萄糖酸钠缓凝剂、硼酸缓凝剂中的一种或两种以上组合。
7.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述早强剂为碳酸锂早强剂。
8.根据权利要求1所述的钢筋连接用低温型套筒灌浆材料，其特征在于，所述防冻剂为甲酸钙防冻剂。
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| CN115872675A (zh) * | 2022-11-10 | 2023-03-31 | 上海宝冶工程技术有限公司 | 钢筋连接用套筒灌浆修补料及制备方法 |
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