CN102260056A - 后张法预应力孔道压浆剂 - Google Patents
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Abstract
本发明公开了一种后张预应力孔道压浆剂，其特征在于由下述重量份的原料混合而成：高效减水剂5~12份、有机羟基羧酸盐1~1.2份和缓凝辅料1~2份、活性材料30~50份、微膨胀组分30～50份和消泡剂0.1～0.3份，所述活性材料为超细氧化铝或微硅粉。本发明具有适宜的微膨胀和良好的活性，内掺水泥的10～15%（替代水泥质量的10~15%）可以配制M50级以上孔道压浆；且具有无毒、低碱、微膨胀（24小时自由膨胀率为1%）、浆体饱满无收缩（灌注时不存在直径大于3mm的气囊和体积大于1ml的水）、强度高（28天的抗压强度大于72MPa、抗折强度大于11MPa）、耐久性好（碱含量低于1%），与水泥适应性好。
Description
技术领域
本发明属于建筑材料技术领域，具体说是一种用于混凝土的后张法预应力孔道压浆剂。
背景技术
在预应力箱梁中，预应力钢绞线和孔道压浆站着举足轻重的地位，是预应力能否正确建立并达到设计目的的关键。预应力孔道压浆的目的：1）排除孔道内的水分和气体，使水泥浆充实孔道空间；2）保护预应力筋不锈蚀；3）充实梁体的密实度，后张预应力构件中的预留孔道穿入力筋张拉锚固后，仍有1/2~1/3的空隙，压浆后，这些空间被水泥浆严密充实，凝固后与构件形成一个密实的整体，有利于整体共同受力；4）减轻锚具负担，孔道压浆后，浆体对预应力筋将产生巨大的握裹力，即使锚具超过疲劳极限而失去锚固作用，也有水泥浆产生的握裹力作为第二道防线，无需担心力筋脱锚而造成梁体的断裂。
现在很多施工单位孔道压浆采用水泥内掺膨胀剂和减水剂的方法，经常出现因施工管理不善导致压浆不饱满，或与预应力钢绞线握裹力差，泌水、收缩、强度低于设计等不良现象，导致钢绞线锈蚀断裂，最终导致预应力消失，梁体断裂的重大质量事故。
发明内容
本发明要解决的技术问题是提供一种用于混凝土的后张预应力孔道压浆剂，采用上述压浆剂，混凝土硬化后更密实，强度更高。
为解决上述技术问题，本发明采用的技术方案是：
一种后张预应力孔道压浆剂，其由下述重量份的原料混合而成：高效减水剂5~12份、有机羟基羧酸盐1~1.2份、缓凝辅料1~2份、活性材料30~50份、微膨胀组分30～50份和消泡剂0.1～0.3份，所述活性材料为超细氧化铝或微硅粉。
优选的，所述高效减水剂为粉剂聚羧酸高效减水剂、粉剂萘系高效减水剂或粉剂脂肪族高效减水剂。所述高效减水剂能够提供较高的减水，保证浆体的稠度满足施工的要求。
所述微膨胀组分为高温煅烧的硫铝酸钙与无水石膏、硫酸铝、硫酸镁和铁粉粉磨而成；其比表面积大于300m2/kg；其重量份数为：硫铝酸钙70~85、无水石膏10~15、硫酸铝3~5、硫酸镁1~3、铁粉1~3。本发明的微膨胀成分能够保证浆体的饱满、不收缩，和对钢筋的握裹性以及孔道的密实性。
所述有机羟基羧酸盐为葡萄糖酸钠、酒石酸钠或柠檬酸钠。
所述缓凝辅料为苯甲酸钠、三聚磷酸钠、六偏磷酸钠或多聚磷酸钠。有机羟基羧酸盐和缓凝辅料能够保证搅拌出的物料在一定时间内保持粘度和流动性的稳定。
所述活性材料激发水泥浆体的早期强度，保证试体的早期强度，满足施工过程的时间要求，缩短工期，另能大幅降低泌水性，与水泥的水化产物能很好的填充水化空隙。
所述消泡剂保证浆体的密实性，减少消除浆体表面的浮沫。所述消泡剂采用市售的用于水泥的消泡剂均可。
上述后张预应力孔道压浆剂的制备方法：按照上述配比称取原料，搅拌均匀即可。
采用上述技术方案产生的有益效果在于：本发明具有适宜的微膨胀和良好的活性，内掺水泥的10～15%（替代水泥质量的10~15%）可以配制M50级以上孔道压浆；且具有无毒、低碱、微膨胀（24小时自由膨胀率为1%）、浆体饱满无收缩（灌注时不存在直径大于3mm的气囊和体积大于1mL的水）、强度高（28天的抗压强度大于72MPa、抗折强度大于11MPa）、耐久性好（碱含量低于1%），与水泥适应性好。
具体实施方式
实施例1
按照下述重量份称取原料：市售的聚羧酸高效减水剂粉剂5份、葡萄糖酸钠1份、苯甲酸钠1份、活性材料30份、微膨胀组分30份和消泡剂0.1份，然后搅拌均匀，所述活性材料为超细氧化铝。
所述微膨胀组分为高温煅烧的硫铝酸钙与无水石膏、硫酸铝、硫酸镁和铁粉粉磨而成；其比表面积大于300m2/kg；其重量配比为：硫铝酸钙70重量份、无水石膏12重量、硫酸铝3重量份、硫酸镁3重量份、铁粉1重量份。
将本实施例制得的压浆剂掺入水泥（替代普通水泥重量的10%）和水，水胶比为0.31~0.33，搅拌均匀制备压浆材料，用于后张预应力孔道压浆施工，其性能见表1。
实施例2
按照下述重量份称取原料：市售的萘系高效减水剂粉剂12份、酒石酸钠1.2份、三聚磷酸钠2份、活性材料40份、微膨胀组分40份和消泡剂0.2份，然后搅拌均匀，所述活性材料为微硅粉。
所述微膨胀组分为高温煅烧的硫铝酸钙与无水石膏、硫酸铝、硫酸镁和铁粉粉磨而成；其比表面积大于300m2/kg；其重量配比为：硫铝酸钙80重量份、无水石膏10重量、硫酸铝5重量份、硫酸镁1重量份、铁粉2重量份。
将本实施例制得的压浆剂掺入水泥（替代普通水泥重量的10%）和水，水胶比为0.31~0.33，搅拌均匀制备压浆材料，用于后张预应力孔道压浆施工，其性能见表1。
实施例3
与实施例1不同的是：市售的脂肪族高效减水剂粉剂12份、柠檬酸钠1.2份、六偏磷酸钠2份、活性材料40份、微膨胀组分40份和消泡剂0.2份。
所述微膨胀组分为：硫铝酸钙85重量份、无水石膏15重量、硫酸铝4重量份、硫酸镁2重量份、铁粉3重量份。
所述六偏磷酸钠还可以用多聚磷酸钠代替。
性能测试见表1。
表1
Claims (4)
1.一种后张法预应力孔道压浆剂，其特征在于由下述重量份的原料混合而成：高效减水剂5~12份、有机羟基羧酸盐1~1.2份和缓凝辅料1~2份、活性材料30~50份、微膨胀组分30～50份和消泡剂0.1～0.3份，所述活性材料为超细氧化铝或微硅粉。
2.根据权利要求1所述的后张法预应力孔道压浆剂，其特征在于所述高效减水剂为粉剂聚羧酸高效减水剂、萘系高效减水剂或脂肪族高效减水剂。
3.根据权利要求1所述的后张法预应力孔道压浆剂，其特征在于所述微膨胀组分为高温煅烧的硫铝酸钙与无水石膏、硫酸铝、硫酸镁和铁粉粉磨而成；其比表面积大于300m2/kg；其重量配比为：硫铝酸钙70~85重量份、无水石膏10~15重量、硫酸铝3~5重量份、硫酸镁1~3重量份、铁粉1~3重量份。
4.根据权利要求1所述的后张法预应力孔道压浆剂，其特征在于所述有机羟基羧酸盐为葡萄糖酸钠、酒石酸钠或柠檬酸钠；所述缓凝辅料为苯甲酸钠、三聚磷酸钠、六偏磷酸钠或多聚磷酸钠。
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| CN103172296A (zh) * | 2011-12-21 | 2013-06-26 | 中冶建筑研究总院有限公司 | 后张预应力混凝土梁管道压浆剂 |
| CN104631262A (zh) * | 2014-12-19 | 2015-05-20 | 大元建业集团股份有限公司 | 一种减少现场水泥冷再生混合料基层裂缝的施工方法 |
| CN105271890A (zh) * | 2015-10-23 | 2016-01-27 | 武汉比邻科技发展有限公司 | 一种预应力孔道压浆剂及其制备和使用方法 |
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| CN101817656A (zh) * | 2009-02-26 | 2010-09-01 | 北京东方雨虹防水技术股份有限公司 | 后张法预应力混凝土梁管道压浆剂 |
| CN101830664A (zh) * | 2010-04-14 | 2010-09-15 | 中国科学院武汉岩土力学研究所 | 一种预应力锚固灌浆材料外加剂及制备方法和应用 |
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| CN103172296A (zh) * | 2011-12-21 | 2013-06-26 | 中冶建筑研究总院有限公司 | 后张预应力混凝土梁管道压浆剂 |
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| CN104631262A (zh) * | 2014-12-19 | 2015-05-20 | 大元建业集团股份有限公司 | 一种减少现场水泥冷再生混合料基层裂缝的施工方法 |
| CN104631262B (zh) * | 2014-12-19 | 2018-10-02 | 大元建业集团股份有限公司 | 一种减少现场水泥冷再生混合料基层裂缝的施工方法 |
| CN105271890A (zh) * | 2015-10-23 | 2016-01-27 | 武汉比邻科技发展有限公司 | 一种预应力孔道压浆剂及其制备和使用方法 |
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