{"title":"用沸石添加剂改性抗硫酸盐硅酸盐水泥","authors":"M. Sanytsky, T. Kropyvnytska, R.Yu. Trefler","doi":"10.31650/2415-377x-2022-87-100-107","DOIUrl":null,"url":null,"abstract":"The article shows that one of the ways to increase the sulfate resistance of cements is to use as an additive of pozzolanic action based on highly dispersed zeolite, which increases the corrosion resistance of concrete. Physical-chemical properties of zeolite tuff as a mineral constituent of Portland cements with the addition of pozzolana are presented. The use of modern grinding technology by separate grinding of Portland cement clinker and natural zeolite in mills with separators of the latest generation allows to obtain high quality Portland cement with zeolite CEM II/A-P 42.5 R PJSC \"Ivano-Frankivsk Cement\", characterized by high early strength. It is shown that the replacement of the clinker component with zeolite leads to a decrease the content of clinker minerals C3S and C3A in cements, which significantly limit the corrosion resistance of cement stone. Highly dispersed zeolite is characterized by increased pozzolanic activity (after 28 days, the absorption of Ca(OH)2 is 200-250 mg/g). Due to pozzolanic reaction with the formation of C-S-H-phases, the content of calcium hydroxide in the paste based on CEM II/A-P 42.5 R is reduced by 2 times compared to Portland cement CEM I 42.5 R. Decrease in the concentration of Ca(OH)2 in cement pastes eliminates the possibility of the formation of a significant amount of ettringite, which causes sulfate corrosion of cement stone. It was found that during the hardening of Portland cement CEM II/A-P 42.5 R under the influence of sulfate and magnesium media, the coefficient of corrosion resistance Ks after 56 days is 1.16 and 0.98, respectively, while for samples based on Portland cement CEM I 42.5 R Ks decreases by 1.2-1.3 times. The results of researches of influence of aggressive environments on corrosion resistance of Portland cement with the increased content of zeolite type CEM ІІ/В-Р 42.5 are resulted. For Portland cement CEM ІІ/В-Р 42.5 the coefficient of corrosion resistance in the conditions of sulphate environment Кс90 = 1.47. Portland cements with zeolite strength class 42.5, modified with superplasticizers of polycarboxylate type, are characterized by high sulfate resistance and should be used for the manufacture of concrete classes C25/30...C50/60 for construction of dams, hydraulic structures, sewers storage of waste from livestock farms, etc. Modified rapid-hardening Portland cements with the zeolite additive provide technical, environmental and economic effects in the manufacture of concrete and reinforced concretes of hydraulic structures.","PeriodicalId":273453,"journal":{"name":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","volume":"12 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"MODIFIED SULPHATE-RESISTANT PORTLAND CEMENTS WITH THE ZEOLITE ADDITIVE\",\"authors\":\"M. Sanytsky, T. Kropyvnytska, R.Yu. Trefler\",\"doi\":\"10.31650/2415-377x-2022-87-100-107\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The article shows that one of the ways to increase the sulfate resistance of cements is to use as an additive of pozzolanic action based on highly dispersed zeolite, which increases the corrosion resistance of concrete. Physical-chemical properties of zeolite tuff as a mineral constituent of Portland cements with the addition of pozzolana are presented. The use of modern grinding technology by separate grinding of Portland cement clinker and natural zeolite in mills with separators of the latest generation allows to obtain high quality Portland cement with zeolite CEM II/A-P 42.5 R PJSC \\\"Ivano-Frankivsk Cement\\\", characterized by high early strength. It is shown that the replacement of the clinker component with zeolite leads to a decrease the content of clinker minerals C3S and C3A in cements, which significantly limit the corrosion resistance of cement stone. Highly dispersed zeolite is characterized by increased pozzolanic activity (after 28 days, the absorption of Ca(OH)2 is 200-250 mg/g). Due to pozzolanic reaction with the formation of C-S-H-phases, the content of calcium hydroxide in the paste based on CEM II/A-P 42.5 R is reduced by 2 times compared to Portland cement CEM I 42.5 R. Decrease in the concentration of Ca(OH)2 in cement pastes eliminates the possibility of the formation of a significant amount of ettringite, which causes sulfate corrosion of cement stone. It was found that during the hardening of Portland cement CEM II/A-P 42.5 R under the influence of sulfate and magnesium media, the coefficient of corrosion resistance Ks after 56 days is 1.16 and 0.98, respectively, while for samples based on Portland cement CEM I 42.5 R Ks decreases by 1.2-1.3 times. The results of researches of influence of aggressive environments on corrosion resistance of Portland cement with the increased content of zeolite type CEM ІІ/В-Р 42.5 are resulted. For Portland cement CEM ІІ/В-Р 42.5 the coefficient of corrosion resistance in the conditions of sulphate environment Кс90 = 1.47. Portland cements with zeolite strength class 42.5, modified with superplasticizers of polycarboxylate type, are characterized by high sulfate resistance and should be used for the manufacture of concrete classes C25/30...C50/60 for construction of dams, hydraulic structures, sewers storage of waste from livestock farms, etc. Modified rapid-hardening Portland cements with the zeolite additive provide technical, environmental and economic effects in the manufacture of concrete and reinforced concretes of hydraulic structures.\",\"PeriodicalId\":273453,\"journal\":{\"name\":\"Bulletin of Odessa State Academy of Civil Engineering and Architecture\",\"volume\":\"12 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2022-06-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Odessa State Academy of Civil Engineering and Architecture\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.31650/2415-377x-2022-87-100-107\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Odessa State Academy of Civil Engineering and Architecture","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.31650/2415-377x-2022-87-100-107","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
提高水泥抗硫酸盐侵蚀性能的途径之一是在高分散沸石的基础上添加火山灰作用添加剂,提高混凝土的抗腐蚀性能。介绍了沸石凝灰岩作为硅酸盐胶结物的矿物组分,在掺入火山灰后的理化性质。采用现代研磨技术,将硅酸盐水泥熟料和天然沸石在磨机中进行分离研磨,采用最新一代的分离器,可以获得高质量的硅酸盐水泥,沸石为CEM II/A-P 42.5 R PJSC“Ivano-Frankivsk水泥”,具有高早期强度的特点。结果表明,沸石替代熟料组分导致水泥中熟料矿物C3S和C3A含量降低,显著限制了水泥石的耐腐蚀性能。高分散沸石的特点是火山灰活性增加(28天后,Ca(OH)2的吸收量为200-250 mg/g)。由于火山灰与c - s - h相的形成,CEM II/ a -p 42.5 R基水泥浆体中氢氧化钙的含量比波特兰水泥CEM I 42.5 R降低了2倍,降低了水泥浆体中Ca(OH)2的浓度,消除了形成大量钙矾石的可能性,钙矾石对水泥石产生硫酸盐腐蚀。结果表明,在硫酸盐介质和镁介质作用下,硅酸盐水泥CEM II/A-P 42.5 R的硬化过程中,56天后的耐蚀系数Ks分别为1.16和0.98,而以CEM I 42.5 R为基材的硅酸盐水泥样品的Ks降低了1.2 ~ 1.3倍。研究了侵蚀环境对硅酸盐水泥耐蚀性的影响,并研究了CEM型沸石ІІ/В-Р 42.5掺量的增加。对于波特兰水泥CEM ІІ/В-Р 42.5,硫酸盐环境下的耐蚀系数Кс90 = 1.47。沸石强度为42.5级的硅酸盐水泥,经聚羧酸型高效减水剂改性,具有较高的抗硫酸盐性能,可用于制造C25/30级混凝土。C50/60用于建造水坝、水工结构、污水渠、储存禽畜农场废物等。掺入沸石添加剂的改性快硬硅酸盐水泥在水工建筑混凝土和钢筋混凝土制造中具有技术、环境和经济效益。
MODIFIED SULPHATE-RESISTANT PORTLAND CEMENTS WITH THE ZEOLITE ADDITIVE
The article shows that one of the ways to increase the sulfate resistance of cements is to use as an additive of pozzolanic action based on highly dispersed zeolite, which increases the corrosion resistance of concrete. Physical-chemical properties of zeolite tuff as a mineral constituent of Portland cements with the addition of pozzolana are presented. The use of modern grinding technology by separate grinding of Portland cement clinker and natural zeolite in mills with separators of the latest generation allows to obtain high quality Portland cement with zeolite CEM II/A-P 42.5 R PJSC "Ivano-Frankivsk Cement", characterized by high early strength. It is shown that the replacement of the clinker component with zeolite leads to a decrease the content of clinker minerals C3S and C3A in cements, which significantly limit the corrosion resistance of cement stone. Highly dispersed zeolite is characterized by increased pozzolanic activity (after 28 days, the absorption of Ca(OH)2 is 200-250 mg/g). Due to pozzolanic reaction with the formation of C-S-H-phases, the content of calcium hydroxide in the paste based on CEM II/A-P 42.5 R is reduced by 2 times compared to Portland cement CEM I 42.5 R. Decrease in the concentration of Ca(OH)2 in cement pastes eliminates the possibility of the formation of a significant amount of ettringite, which causes sulfate corrosion of cement stone. It was found that during the hardening of Portland cement CEM II/A-P 42.5 R under the influence of sulfate and magnesium media, the coefficient of corrosion resistance Ks after 56 days is 1.16 and 0.98, respectively, while for samples based on Portland cement CEM I 42.5 R Ks decreases by 1.2-1.3 times. The results of researches of influence of aggressive environments on corrosion resistance of Portland cement with the increased content of zeolite type CEM ІІ/В-Р 42.5 are resulted. For Portland cement CEM ІІ/В-Р 42.5 the coefficient of corrosion resistance in the conditions of sulphate environment Кс90 = 1.47. Portland cements with zeolite strength class 42.5, modified with superplasticizers of polycarboxylate type, are characterized by high sulfate resistance and should be used for the manufacture of concrete classes C25/30...C50/60 for construction of dams, hydraulic structures, sewers storage of waste from livestock farms, etc. Modified rapid-hardening Portland cements with the zeolite additive provide technical, environmental and economic effects in the manufacture of concrete and reinforced concretes of hydraulic structures.