CN114436574B - 灭活杀菌高耐腐双纤维改性修复砂浆及其制备方法 - Google Patents
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Abstract
本发明公开了灭活杀菌高耐腐双纤维改性修复砂浆,按质量配比具体包括,每300kg水泥混合砂400kg、减水剂4.5kg、保塑剂1kg、玄武岩1.5kg、聚丙烯0.6kg、硫化铜0.3kg、二氧化钛0.5kg、矿粉60kg、硅灰10kg、石英砂50kg、甲基硅酸钠0.6kg、无机铝酸盐6kg、水106kg;本发明还公开了灭活杀菌高耐腐双纤维改性修复砂浆的制备方法,添加了二氧化钛和硫化铜,二氧化钛和硫化铜具有填充孔隙,抑制或杀灭细菌和砂浆表面微生物的作用;玄武岩和聚丙烯纤维的加入可增加砂浆的抗腐蚀性能和施工性能。对于生物与无机物双重腐蚀环境,该种砂浆可较好的对混凝土材料进行修复与保护。
Description
技术领域
本发明属于土木工程技术领域,具体涉及灭活杀菌高耐腐双纤维改性修复砂浆。
本发明还涉及灭活杀菌高耐腐双纤维改性修复砂浆的制备方法。
背景技术
混凝土凭借良好的受力性能及低廉的价格,在土木工程当中应用最为广泛。由于工程结构服役环境的多样性,当遭遇海洋、盐渍土、低温冻融等严苛环境时,混凝土材料受到各类腐蚀介质侵蚀,主要包括酸、盐等,当混凝土的服役环境中含有腐蚀介质时,混凝土中的化学成分便会和盐或酸发生化学反应,生成可溶物质或稀松的物质,这就使得混凝土结构破坏,强度降低。材料性能发生快速衰退,工程结构寿命远达不到设计预期,给结构安全造成严重影响。
混凝土的耐久性是其抵抗大气作用、化学侵蚀、磨损或其他劣化过程而维持原有形状、质量和使用性能的能力。混凝土结构性能的劣化过程可以是物理作用或化学作用,但在实际工程中更多的是多种因素共同作用的结果。混凝土耐久性影响因素包括:
(1)混凝土抗渗性:抗渗性是指混凝土在压力水的作用下不渗水的能力。(2)混凝土抗冻性:混凝土的抗冻性是指混凝土在含水饱和情况下,在反复冻结和融化作用下,仍较好的保持原有性能的能力(3)抗侵蚀性:当混凝土所处环境的水中含有一些盐或酸时,混凝土中的化学成分如氢氧化钙便会和上述物质发生化学反应,生成可溶物质或松软的物质,继而使混凝土结构破坏,强度降低。(4)混凝土碳化:混凝土中的碱,在潮湿的环境下会和空气中的二氧化碳和水一起发生化学反应,有碳酸钙生成。发生这个反应的后果一是体积收缩,使混凝土产生裂缝,二是使混凝土碱度Ca(OH)2降低。这样混凝土中的钢筋在潮湿空气的作用下,钢筋开始生锈,钢筋生锈引起膨胀,引起混凝土表面强度和内部强度的差异。(5)碱-骨料反应:碱-骨料反应是指在有水的条件下,水泥中过量的碱性氧化物与骨料中的活性二氧化硅之间发生的反应。碱-骨料反应的速度很慢,一般在混凝土浇筑成型后几年逐渐开始,反应生成的碱-硅酸凝胶,能从周围介质中吸收水分而产生3倍以上体积膨胀,严重影响混凝土的耐久性。
在实际工程当中,人们发现生物腐蚀在一定程度上也十分严重,微生物腐蚀有相当的普遍性,凡是与水、土壤或潮湿空气相接触的设施,都可能遭受到微生物的腐蚀。生物对混凝土的腐蚀大致有两种形式:1)生物力学作用。生长在基础设施周围的植物的根茎会钻入混凝土的孔隙中,破坏其密实度。 2)类似于混凝土的化学腐蚀。典型的是硫化细菌在它的生命过程中,能把环境中的硫元素转化成硫酸。这种情况在海洋环境及城市污水结构当中十分普遍及严重。当结构工程遭受环境及生物双重腐蚀作用时,结构性能退化速度极快,有的仅服役5年,就需要修复。
为了保证结构的正常使用,需要对腐蚀后混凝土材料进行工程性修复,修复内容主要包括:1.表观修复,恢复原有几何尺寸;2.功能修复,修复后结构受力性能不能低于原有设计标准;3.功能保护,修复材料要具有较高的耐腐蚀性能,可对结构形成一定保护作用,延长结构使用寿命;同时,修复材料还需具有较强的灭活杀菌能力,防止混凝土表面滋生大量藻类与细菌,防止生物腐蚀。对腐蚀后结构进行功能及防护一体修复的意义十分重大,具有广阔的工程应用前景。
发明内容
本发明的目的是提供灭活杀菌高耐腐双纤维改性修复砂浆,针对目前劣化环境下水泥基材料腐蚀问题,为修复受侵蚀结构并提高受侵蚀结构的防护能力,目前,市面上多采用聚合物防腐砂浆进行修复,但由于聚合物砂浆存在寿命短、易降解且成本高等问题。
本发明还提供了高灭活杀菌高耐腐双纤维改性修复砂浆的制备方法。
本发明的第一个技术方案是,灭活杀菌高耐腐双纤维改性修复砂浆,按质量配比具体包括,每300kg水泥混合砂400kg、减水剂4.5kg、保塑剂1kg、玄武岩1.5kg、聚丙烯0.6kg、硫化铜0.3kg、二氧化钛0.5kg、矿粉60kg、硅灰10kg、石英砂50kg、甲基硅酸钠0.6kg、无机铝酸盐6kg、水106kg;
本发明第一个技术方案的特点还在于:
其中硫化铜可通过铜粉、硫磺粉或硫化银替代。
本发明的第二个技术方案是,灭活杀菌高耐腐双纤维改性修复砂浆的制备方法,具体按以下步骤实施:
步骤1,将砂进行预处理;
步骤2,将减水剂、保塑剂、二氧化钛和甲基硅酸钠进行混合得到混合液;
步骤3,将水泥,砂再倒入矿粉、硅灰、石英砂、硫化铜、无机铝酸盐防水剂搅拌,搅拌均匀后倒入剩余水与混合液,继续搅拌。
本发明的第二个技术方案的特点还在于:
其中步骤1中将砂进行清洗晒干至含水率小于0.3kg,用80目筛过滤;
其中将筛过的细砂取部分与水用玄武岩和聚丙烯打散,具体为:将砂和水按质量比为1000:15混合,然后将砂揉搓均匀,玄武岩和聚丙烯加入湿润的砂中搓散;
其中步骤3中将水泥,砂再倒入矿粉、硅灰、石英砂、无机铝酸盐防水剂搅拌180s~200s,搅拌均匀后倒入剩余水与混合液,继续搅拌240s~250s。
本发明的有益效果是:
本发明的灭活杀菌高耐腐双纤维改性修复砂浆中含有一定比例的二氧化钛和硫化铜,具有填充孔隙,抑制或杀灭细菌和混凝土表面微生物的作用;二氧化钛:良好的易分散性,并且无毒、无味、无刺激性,使用安全,还兼有杀菌除臭的作用;硫化铜:极难溶于水,因此不会对水体产生污染,硫化铜:具有硫和铜的杀菌作用,可杀灭混凝土表面细菌及藻类,防止其在混凝土表面生长繁殖,但是硫化铜的过量加入会使强度大大降低(掺入比例经过科学研究);两种纤维(玄武岩纤维、聚丙烯纤维)以及添加的掺合料解决了复杂环境中工程结构的腐蚀问题,其次在砂浆中添加一定比例的甲基硅酸钠与材料反应生成一层树脂薄膜形成憎水层以达到防水的作用;砂浆中添加一定比例的无机铝酸盐防水剂,可使砂浆不产生干收缩裂,降低吸水率,解决了防水防裂抗渗的问题。提高了受侵蚀严重的建(构筑)物的抗侵蚀能力及自修复能力;本发明砂浆成本约为市场普通聚合物砂浆成本的50%,经济效益优异的同时又保证了其抗压强度,工程应用价值显著,可实现工业化生产;本发明砂浆将大大改善市场普通聚合物砂浆的不足,并具有较好的力学性质以及优异的成本优势,具有显著的科研及工程应用价值。
附图说明
图1是本发明的灭活杀菌高耐腐双纤维改性修复砂浆与聚合物砂浆表面沙化对比图;
图2是本发明的灭活杀菌高耐腐双纤维改性修复砂浆与聚合物砂浆孔洞对比图;
图3是本发明的灭活杀菌高耐腐双纤维改性修复砂浆与聚合物砂浆内部腐蚀晶体的对比图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
本发明提供了灭活杀菌高耐腐双纤维改性修复砂浆,按质量配比具体包括,每300kg水泥混合砂400kg、减水剂4.5kg、保塑剂1kg、玄武岩1.5kg、聚丙烯0.6kg、硫化铜0.3kg、二氧化钛0.5kg、矿粉60kg、硅灰10kg、石英砂50kg、甲基硅酸钠0.6kg、无机铝酸盐6kg、水106kg;硫化铜可通过铜粉、硫磺粉或硫化银替代;
本发明的核心材料含量比例:与胶凝材料相比,杀菌材料硫化铜为0.83‰左右,二氧化钛为1.393‰左右,玄武岩纤维掺量为0.41%左右,聚丙烯纤维掺量为0.17%左右,甲基硅酸钠为0.17%左右,无机铝盐防水剂为1.7%左右;
本发明还提供了灭活杀菌高耐腐双纤维改性修复砂浆的制备方法,具体按以下步骤实施:
步骤1,将砂进行预处理;将砂进行清洗晒干至含水率小于0.3%,用 80目筛过滤,将筛过的细砂取部分与水用玄武岩和聚丙烯打散,具体为:将砂和水按质量比为1000:15混合,然后将砂揉搓均匀,玄武岩和聚丙烯加入湿润的砂中搓散;
步骤2,将减水剂、保塑剂、二氧化钛和甲基硅酸钠进行混合得到混合液;
步骤3,水泥,砂再倒入矿粉、硅灰、石英砂、硫化铜、无机铝酸盐防水剂搅拌180s~200s,搅拌均匀后倒入剩余水与混合液,继续搅拌240s~250s。
实施例
具体配合比如下表1
表1砂浆配合比
(1)将普通河砂清洗晒干至含水率小于0.3%,用80目筛过滤。制作防腐砂浆时,按照所需配置量,称好各材料,取部分细砂与水用于纤维打散。每公斤砂加约15克水,将砂揉搓均匀润湿。(若含水率过大,纤维“聚团”情况会加重;过小,则会发生“打毛”情况)。将纤维拌入湿润砂中搓散均匀备用;
(2)按每立方米砂浆,取少量水拌入4.5kg减水剂、1kg保塑剂、0.5kg 二氧化钛、0.6kg甲基硅酸钠搅拌均匀备用;
(3)按每立方米砂浆,将300kg水泥,400kg砂(包含搓散纤维用砂)、再倒入胶凝材料(60kg矿粉、10kg硅灰、50kg石英砂、0.3kg硫化铜、6kg 无机铝酸盐防水剂)搅拌180秒,搅拌均匀后倒入剩余水与备用混合液,继续搅拌240秒左右。
表2各试件抗压强度(单位:Mpa)
表2中S2聚合物砂浆,为S5为灭活杀菌高耐腐砂浆。可以看出高耐腐砂浆与聚合物砂浆相比,强度以及强度保有率均有提高,优势显著。
针对主要材料进行了市场价调查,给出了各试块***预览如下:分析可知,项目配置砂浆试块较市面上聚合物砂浆价格,优惠近一半,且表现出较优性能。
(1)经过柠檬酸侵蚀实验分析(上表2),聚合物防腐砂浆S2强度保有率为63.20%,灭活杀菌高耐腐砂浆S5强度保有率为73.37%,较聚合物防腐砂浆增长了10.17%;灭活杀菌高耐腐砂浆S5剩余强度为33.22Mpa,聚合物防腐砂浆S2剩余强度为28.29Mpa,较聚合物防腐砂浆增长了约5Mpa,耐腐蚀性能优异。
(2)聚合物防腐砂浆市场售价每吨850元,双掺防腐砂浆S5每吨造价 458元,仅为聚合物防腐砂浆的54%,经济优势显著。
(3)从图1中可以看出聚合物砂浆表面沙化明显,高耐腐砂浆表面沙化轻微;图2中聚合物砂浆孔洞较多,高耐腐砂浆孔洞较少;图3中聚合物砂浆内部腐蚀晶体分布众多,高耐腐砂浆内部腐蚀晶体分布较少;
综合分析,本项目研发的新型灭活杀菌高耐腐砂浆在耐腐蚀性能、力学性质及经济性上具有明显优势,工程应用价值显著。
Claims (1)
1.灭活杀菌高耐腐双纤维改性修复砂浆,其特征在于,按质量配比具体包括,每300kg水泥混合砂400kg、减水剂4.5kg、保塑剂1kg、玄武岩1.5kg、聚丙烯0.6kg、硫化铜0.3kg、二氧化钛0.5kg、矿粉60kg、硅灰10kg、石英砂50kg、甲基硅酸钠0.6kg、无机铝酸盐6kg、水106kg;
所述灭活杀菌高耐腐双纤维改性修复砂浆的制备方法,具体按以下步骤实施:
步骤1,将砂进行清洗晒干至含水率小于0.3kg,用80目筛过滤;将筛过的细砂取部分与水用玄武岩和聚丙烯打散,具体为:将砂和水按质量比为1000:15混合,然后将砂揉搓均匀,玄武岩和聚丙烯加入湿润的砂中搓散;
步骤2,将减水剂、保塑剂、二氧化钛和甲基硅酸钠进行混合得到混合液;
步骤3,将水泥,砂再倒入矿粉、硅灰、石英砂、无机铝酸盐防水剂搅拌180s~200s,搅拌均匀后倒入剩余水与混合液,继续搅拌240s~250s。
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