文档介绍：武汉理工大学硕士学位论文硬石膏类膨胀剂的研究姓名:薛爽申请学位级别:硕士专业:环境工程指导教师:陈吉春 20060401 摘要随着现代混凝土技术的发展,混凝土结构裂缝呈现越来越严重的髓势,尤其是早期裂缝,己成为土木工稷界一个重要研究方向。掺加膨胀剂是目前我国控制混凝±工程黎i缝懿主要榜糕攒藏,渥凝±膨胀翔褒簧逮滢凝土中’可掇滋予绩或溢度降低孳|麓静拉应力,怒割嶷好的{}偿收缩终搦,髓提裹混凝±豹挠袈苈渗藐力, 常用于髑己制膨胀混凝土或撬裂防渗混凝土,广涎地应用于防水、抗渗、修补等工程中。一般常用的膨胀剂脊硫铝酸盐类膨胀剂(如UEA、,氧化钙类膨胀剂、复合膨胀剂等。在实际使用中,膨胀剂类粼、掺量及其使用祭佟对混凝土的主要热戆影响很大,现有戆膨胀剡存在着实际掺爨较大、渥凝±焱度及藩久毪发震与彩强裁靛澎瓢速率不秘调、黪获效戆絮筒浮徐、钙醍石 AFt棚延迟性反J壶(DEF)等~系列问题,而目前国内外这方面的研究成果较少。已脊的研究表明,硬石膏W以作为一种基础材料用于膨胀混合材料的生产。本研究根据目前国内外以钙钒石为膨胀源的膨胀剂及江夏硬石膏的物质成分特点, 研制翼蠢饯嶷性能的硬籍膏类膨胀到,不仅可以消除混凝土内部因收缩产生徽裂绞鹋瑷象,对羲莺囊整彩黻裁熬发震其毫一宠熬攘嚣意义,瑟显秀这类工照褒石膏的台溅开发利用提供了新的途径,既治理了污染,又变废为宝,W以取得很好的社会效益和良好的经济效觳。为了熙好的研究混凝土中膨胀剂的效用,本文从影响膨胀剂性能的因素着手讨论了水胶魄的变化、膨胀弃《掺量的变化、矿物掺朔料的掺用、对膨胀割膨胀效用豹影螭。研究结果表臻:班鹗辘嚣和硬石膏为基本缀分酝翎的AG膨涨舞g和以粉煤灰与硬石脊为基本组分的FG膨胀剂膨胀效果和抗聪强度基本达到国家标准要求。关键溺:混凝土;裂缝;膨胀剂;明矾石;硬石膏:粉煤灰 Abstract During the technical development ofmodem concrete,concrete structure crack (especially early-agecrack)es more andmore seriousand hasbeen one of main research directions expansion admixture isthe main material measures tocontrol concrete structure crack in our country atpresent. Expansion admixture of concrete can offset the tension—stress caused by drying shrinkage ortemperature lowing of has pensation toshrinkage, and Callimprove theanti-cracking andanti·rating performance is often added to concrete top roduceexpanding concrete or theanti—cracking and anti·ratingconcrete,which arc widely used in such engineering as waterproofing,anti-rating,mending expansion admixture include at present sulpho aluminate,(such asU飚EA-L etc)'calcium oxide,and positeexpansion practical USeS,the majorperformances of concrete areassociated with thequantities,types and the service conditions of theexpansion- expansion admixtures ofconcrete available atpresent stillhave many ings,such as the greater quantities required,the non=relevance between developments of concrete strength and durability and expanding speeds ofexpansion