CN113979713A - 一种适用于高温地区的高性能混凝土 - Google Patents
一种适用于高温地区的高性能混凝土 Download PDFInfo
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Abstract
本发明一种适用于高温地区的高性能混凝土,按质量份数计包括:水泥100‑280份;改性偏高岭土150‑230份;黏土熟料150‑260份;煤灰粉80‑190份;砂100‑150份;水玻璃50‑100份;硅酸钠15‑50份;沥青30‑80份;功能性添加剂15‑25份;水:200‑400份;本发明提高了混凝土的各项力学性能以及耐高温性,并有效改善了混凝土的抗冻融能力。
Description
技术领域
本发明涉及土木工程中的建筑材料技术领域,尤其涉及一种适用于高温地区的高性能混凝土。
背景技术
随着技术的发展,工程结构朝着更深、更长远的方向发展,这对混凝土的强度提出了更高的要求,目前部分工业建筑物的特殊结构部位需常期服役在高温环境中,如供热厂的烟道护壁和排渣口,钢铁厂的闷渣池,电炉的基础结构部位等,由于长时间高温环境下工作,经受高温后普通混凝土力学和耐久性能严重劣化,混凝土里骨料会产生膨胀变形从而影响其抗压强度,同时水泥浆体结合水蒸发,从而难以保持混凝土结构的强度。
发明内容
本发明所要解决的技术问题是,克服现有技术的缺点,提供一种适用于高温地区的高性能混凝土。
本发明解决以上技术问题的技术方案是:提供一种适用于高温地区的高性能混凝土,按质量份数计包括:
水泥100-280份;
改性偏高岭土150-230份;
黏土熟料150-260份;
煤灰粉80-190份;
砂100-150份;
水玻璃50-100份;
硅酸钠15-50份;
沥青30-80份;
功能性添加剂15-25份;
水:200-400份。
本发明的进一步限定技术方案:
优选的,水泥为强度等级52.5级及以上等级的硅酸盐或早强型硅酸盐系列水泥。
优选的,所述粉煤灰为II级粉煤灰和I级粉煤灰按质量比1:1混合而成。
优选的,所述砂由硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成,其粒径分别为300-500μm,500-700μm,700-900μm,其中硅砂中二氧化硅的含量≥98%。
优选的,所述功能性添加剂按质量份数计包括聚羧酸减水剂10-22份、磷酸基缓凝剂5-10份、外加剂7-14份、石灰岩碎石20-30份、纳米填料23-33分、耐高温树脂20-80份、短切纤维10-30份。
优选的,所述短切纤维按质量份数计包括玻璃纤维20-36份、玄武岩纤维15-26份、聚丙烯纤维30-40份、钢纤维20-45份、碳纤维10-15份。
优选的,所述耐高温树脂为耐热乙烯基树脂或酚醛环氧树脂或呋喃树脂。
优选的,所述石灰岩碎石包括粒径为15-20mm的细石和粒径为20-35mm的粗石,细石和粗石的重量比为7:3。
本发明的有益效果是:本发明采用水玻璃和硅酸钠配合使用,其中水玻璃为空气硬化粘结剂,而硅酸钠为硬化促进剂,在水玻璃的基础上加入黏土熟料、改性偏高岭土、煤灰粉、砂以及沥青等这些物料制得的耐高温混凝土具有高强度、高粘结性,能够提高混凝土的使用寿命,耐高温橡胶通过硅酸钠改性后可以很好的与混凝土结合,解决了橡胶与混凝土比重差距大带来的混合不均问题,从而避免了橡胶类材料的加入对混凝土后期强度的影响,也增加混凝土的耐高温性;
本发明通过改性偏高岭土与水泥配合使用,显著提高了混凝土的各项力学性能,并有效改善了混凝土的抗冻融能力,同时降低了混凝土的制备成本,改性偏高岭土的加入,改善了水下混凝土的工作性能和提高了偏高岭土的活性反应率,更有利于降低混凝土的体积收缩和提高混凝土的耐久性,而改性偏高岭土与硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成的砂配合使用,不仅减少水泥用量,同时能够有效地缩小混凝土内部气孔尺寸、降低混凝土含气率、提高流动性和密实度,其中硅砂有两种不同粒径按照一定比例混合可使混凝土力学性能提高,这样所制备的混凝土具有良好的力学性能以及耐高温性能;
本发明中添加沥青,其具有极好混溶性,与两种不同粒径的石灰岩碎石配合具有极强吸附力,耐高温树脂使用,提高了混凝土的耐高温性,而由于纳米填料的颗粒较小,在混凝土冷却过程中的热应力得到有效分散,避免出现较大的应力集中,从而进一步提高了混凝土的抗裂性能,
本发明煤灰粉由II级粉煤灰和I级粉煤灰按质量比1:1混合而成,能够增强浆料的网络聚合性,可以缠绕形成网络状结构,从而越能充分发挥团聚水泥颗粒,使混凝土发生增稠或絮凝作用,而且煤灰粉抗压强度足够大,能够起到良好的支撑效果;
玻璃纤维能有效抵抗水泥中高碱物质的侵蚀,握裹力强,弹性模量、抗冲击、抗拉、抗弯强度极高,不燃、抗冻、耐温度、湿度变化能力强,抗裂、抗渗性能卓越,在混凝土内部形成三维网络状的结构,起到补强增韧的作用,提高了混凝土的耐高温和力学性能;聚丙烯纤维提高混凝土的抗冲击性、防水隔热性;钢纤维能有效提高混凝土韧性、劈裂抗拉强度、抗折强度、抗弯强度;玄武岩是一种高性能的火山岩组份,这种特殊的硅酸盐,使玄武岩纤维具有优良的耐化学性,是用于增强水泥混凝土的优良材料;同时与沥青配合使用时可以提高混凝土的高温稳定性、低温抗裂性和抗疲劳性等;
本发明聚羧酸减水剂和磷酸基缓凝剂配合使用能实现所需减水性能,防止混凝土的流动性随时间降低,有利于混凝土填筑中进行施工,有效减少水泥的使用量,使混凝土构筑件强度提高;磷酸基缓凝剂可显著提升聚羧酸减水剂对砂、低活性掺合料的适应性,改善混凝土或砂浆的和易性与保坍能力,掺加外加剂对水泥、高粘土和高硫酸盐含量的砂石骨料具有良好的适应性。
具体实施方式
实施例1
本实施例提供一种适用于高温地区的高性能混凝土,按质量份数计包括:水泥100份;改性偏高岭土150份;黏土熟料150份;煤灰粉80份;砂130份;水玻璃70份;硅酸钠20份;沥青30份;功能性添加剂15份;水:220份;
其中水泥强度等级52.5级及以上等级的硅酸盐水泥;
粉煤灰为II级粉煤灰和I级粉煤灰按质量比1:1混合而成,且粉煤灰的抗压强度为1.5MPaMPa;
砂由硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成,其粒径分别为500μm,700μm,900μm,其中硅砂中二氧化硅的含量≥98%;
功能性添加剂按质量份数计包括聚羧酸减水剂10份、磷酸基缓凝剂5份、外加剂7份、石灰岩碎石20份、纳米填料23分、耐高温树脂50份、短切纤维10份;
短切纤维按质量份数计包括玻璃纤维20份、玄武岩纤维15份、聚丙烯纤维30份、钢纤维20份、碳纤维10份;
耐高温树脂为耐热乙烯基树脂;石灰岩碎石包括粒径为15mm的细石和粒径为20mm的粗石,细石和粗石的重量比为7:3。
实施例2
本实施例提供一种适用于高温地区的高性能混凝土,按质量份数计包括:水泥200份;改性偏高岭土190份;黏土熟料220份;煤灰粉80-190份;砂100份;水玻璃60份;硅酸钠40份;沥青40份;功能性添加剂20份;水:300份;
其中水泥强度等级52.5级及以上等级的硅酸盐水泥;
粉煤灰为II级粉煤灰和I级粉煤灰按质量比1:1混合而成,且粉煤灰的抗压强度为1.5MPaMPa;
砂由硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成,其粒径分别为300μm,500μm,700μm,其中硅砂中二氧化硅的含量≥98%;
功能性添加剂按质量份数计包括聚羧酸减水剂15份、磷酸基缓凝剂8份、外加剂10份、石灰岩碎石25份、纳米填料30分、耐高温树脂48份、短切纤维20份;
短切纤维按质量份数计包括玻璃纤维28份、玄武岩纤维20份、聚丙烯纤维35份、钢纤维30份、碳纤维13份;
耐高温树脂为酚醛环氧树脂;石灰岩碎石包括粒径为18mm的细石和粒径为23mm的粗石,细石和粗石的重量比为7:3。
实施例3
本实施例提供一种适用于高温地区的高性能混凝土,按质量份数计包括:水泥100-280份;改性偏高岭土150-230份;黏土熟料150-260份;煤灰粉80-190份;砂100-150份;水玻璃50-100份;硅酸钠15-50份;沥青30-80份;功能性添加剂15-25份;水:200-400份。
其中水泥强度等级52.5级及以上等级的硅酸盐水泥;
粉煤灰为II级粉煤灰和I级粉煤灰按质量比1:1混合而成,且粉煤灰的抗压强度为1.5MPaMPa;
砂由硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成,其粒径分别为400μm,600μm,800μm,其中硅砂中二氧化硅的含量≥98%;
功能性添加剂按质量份数计包括聚羧酸减水剂22份、磷酸基缓凝剂10份、外加剂14份、石灰岩碎石30份、纳米填料33分、耐高温树脂60份、短切纤维30份;
短切纤维按质量份数计包括玻璃纤维36份、玄武岩纤维26份、聚丙烯纤维40份、钢纤维45份、碳纤维15份;
耐高温树脂为酚醛环氧树脂;石灰岩碎石包括粒径为20mm的细石和粒径为25mm的粗石,细石和粗石的重量比为7:3。
本发明混凝土高温后力学性能试验方法:按照实施例1-3上述组分制作成多个边长为200mm的立方体试块,标准养护28d后取出自然干燥,分别进行25℃、200℃、500℃、800℃的高温试验,将立方体试块在目标温度下恒温处理3小时后冷却至常温。每个目标温度下放置两块立方体试块,冷却后测试立方体试块的抗压强度和抗折强度,并在表1中列出;肉眼观察并记录立方体表面的裂纹条数,并在表2列出。
表1
表2
表2中,实施例1-3在200℃、500℃、800℃的高温试验后,表面均未产生裂缝说明本发明混凝土在高温下的抗裂性能高。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (8)
1.一种适用于高温地区的高性能混凝土,其特征在于:按质量份数计包括:
水泥100-280份;
改性偏高岭土150-230份;
黏土熟料150-260份;
煤灰粉80-190份;
砂100-150份;
水玻璃50-100份;
硅酸钠15-50份;
沥青30-80份;
功能性添加剂15-25份;
水:200-400份。
2.根据权利要求1所述的一种高性能混凝土,其特征在于,所述水泥为强度等级 52 .5级及以上等级的硅酸盐或早强型硅酸盐系列水泥。
3.根据权利要求1所述的一种高性能混凝土,其特征在于,所述粉煤灰为II 级粉煤灰和I级粉煤灰按质量比1:1混合而成。
4.根据权利要求1所述的一种高性能混凝土,其特征在于,所述砂由硅砂、河砂和淡化海砂按重量比1:1:0.6均匀混合而成,其粒径分别为300-500μm, 500-700μm,700-900μm,其中硅砂中二氧化硅的含量≥98%。
5.根据权利要求1所述的一种高性能混凝土,其特征在于,所述功能性添加剂按质量份数计包括聚羧酸减水剂10-22份、磷酸基缓凝剂5-10份、外加剂7-14份、石灰岩碎石20-30份、纳米填料23-33分、耐高温树脂20-80份、短切纤维10-30份。
6.根据权利要求5所述的一种高性能混凝土,其特征在于,所述短切纤维按质量份数计包括玻璃纤维20-36份、玄武岩纤维15-26份、聚丙烯纤维30-40份、钢纤维20-45份、碳纤维10-15份。
7.根据权利要求5所述的一种高性能混凝土,其特征在于,所述耐高温树脂为耐热乙烯基树脂或酚醛环氧树脂或呋喃树脂。
8.根据权利要求5所述的一种高性能混凝土,其特征在于,所述石灰岩碎石包括粒径为15-20mm的细石和粒径为20-35mm的粗石,细石和粗石的重量比为7:3。
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