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Married Blogs online dating.Married Blogs online dating InformationASR is one example of a more general problem known as Alkali Aggregate Reaction [AAR]. ASR is a chemical process in which alkalis, usually predominantly from the cement, combine with certain types of silica in the aggregate when moisture is present. This reaction produces an alkali-silica gel that can absorb water and expand to cause cracking and disruption of the concrete. For damaging reaction to take place the following need to be present in sufficient quantities. High alkali cement Reactive aggregate [e.g. crushed greywacke type sandstone] MoistureStructures most at risk are bridges, hydraulic structures, exposed frames [e.g. open multistorey car parks] and foundations. In relation to total construction volume, the incidence of significant damage due to ASR in the UK is small. ASR was discovered in the USA in the 1940s; no case was found in the UK until 1971 [in a concrete dam in Jersey]. The problem is known to exist in at least 35 countries. Affected concrete often exhibits map cracking of the surface, known colloquially as Isle of Man cracking after that island`s three legged emblem. In heavily loaded sections the cracking will probably follow the line of the main reinforcement. An excellent overview of the phenomenon can be found in BRE Digest 330. Since the early 1980s recommendations have been produced and refined to the stage where ASR is unlikely if these are adopted. Principal methods include. · Controlling the level of available alkalis in the concrete mix. · Using pfa and/or ggbs as a partial cement replacement Full details of these recommendations can be found in Concrete Society report TR No: 30 [Third Edition] often known as the Hawkins report. At a time when recycling of materials has become a priority it should be noted that this report recommends that recycled aggregates (including crushed concrete and other demolition wastes) should be regarded as highly reactive. This is a precautionary measure pending further knowledge about their long-term behaviour. Further work is going on to investigate the use of silica fume, metakaolin and lithium salts to achieve the same objective. Research has indicated that air entrainment is not significantly beneficial in inhibiting the problem. This work is being supervised by a BRE Working Party and an Information Paper, IP 1/02 Minimising the risk of alkali-silica reaction: alternative methods, has now been published. 3.2 Diagnosis If ASR is suspected, then an investigation should follow. The extent of this investigation should be related to the criticality of the structure and the perceived intensity of the reaction. Full details of a diagnosis programme can be found in BCA report The diagnosis of alkali-silica reaction. In essence this report recommends the following: · A desk study to ascertain the source and analyses of materials used. · Critical examination of site to determine if causes other than ASR are present · Sampling e.g. by coring in selected areas · Thin section petrography and other analysis of samples to determine the cause of cracking · Report and recommendation on whether remedial treatment is required 3.3 Structural Aspects If ASR has been diagnosed, then remedial treatment may be required. This may take one of the following forms: · Regular monitoring of the structure to check that deterioration does not reach dangerous proportions. This requires experienced engineering judgement · Detailed check on the structural details to establish criticality; in particular a critical examination of the robustness of the reinforcement detailing · Measures to reduce the amount of water available to the structure. · Limited strengthening of the structure · Partial or full demolition followed by re-building Further details of these possible actions are available from the IStructE report Structural effects of alkali-silica reaction People who visit this site are also interested in online dating,dating,personals,singles,love,dating service,matchmaking,dating site,date,matchmaker,internet dating,free personals,romance,match,personal ads,online personals,free online dating,single,online dating service,friendship,personal,dating services,service,internet,dating advice,online,services,free dating,free,social networking,chat,relationships,relationship,adult personals,gay,lesbian,find love,sexy,man,matching,friend,site,match maker,match.com,local singles,friends,homosexual,girls,dating tips,cupid,women,online relationships,best,sites,ads,photos,personality,ad,men seeking women,women seeking men,men,meet singles,pictures,sister,gay personal,smart,single women,women seeking women,events,social network,free dating site,Free Dating Services,Free Online Dating Sites,fat,exclusive,girlfriend,single men,meet single,matches,men seeking men,ok,online dating services,okay,okaycupid,okcupid,lifestyle,online dating site,personal ad,free matching,photo,pics,picture,guys,math,bi,chat room,divorce,bisexual,attractive,divorced,adult,american singles,dating sites,dating agency,penpal,new york dating,boyfriend,brides,JustSayHi,openscreen,JustSayHi.com,pen pals,perfect date,lady,perfect match,Jewish dating,personal web site,american girl,reviews,relationship site,profiles,profile tips,privacy,asian,dating ideas,photo personals,photo dating,bay area dating,best online dating service,personality test,dating safety,online singles,date.com,cam,compatibility,matchmaker.com,Chemistry.com,matchmaking service,Matchmaking Sites,no more blind dates,meet man,meet people,nbc,myspace,meet woman,meeting,member profiles,christian dating,metro,metro-date,compatibility test,chemistry,online matching,lonely,online dating sites,Metrodate.com,long-term relationships,chat online,los angeles dating,lov,date ideas,love quizzes,love with girl,lover,marketing,married dating,chat with girls,cupidcast,metrodate,find a match,stds,finance,teen,free dating online,true,free dating service,adult friend finder,singles events,true.com,Dr. Helen Fisher,free online dating service,udate,single romance,single man,adult dating,find girls,speeddating,find love online,find a friend,speed dating,find a date,find photos,find romance,find your perfect match,find your perfect mate,fine girls,spark networks,soul mate,Single Parents,Single Moms,sexy girl,sexuality,woman,sex,find sex,eharmony,serious relationships,serious,senior dating,Search date,romantic,guy,sexy woman,romance online,web,free personality test,Single Dads,single connection,single man seeking woman,webcam,webcam chat,single dating,USA,UK dating,Canada,Jewish match maker service,chemistry match,active singles,adds,Muslim,TRI religious,My Matches,chats,agencies,forums,african american personals,Phoenix Dating,Phoenix Dating Services,Australian personals,Australian dating,Sex dating personals,Play Free Online Games,Christian,adult singles,adult personals dating,Chat Rooms,Online Dating Reviews,adult dating services online,adult dating agency,adult dating services,agency,Buddhist,Online sex dating,action games,adult online dating sites,anonymous,Hindu,free tests,free sex personals,Free Search,free registration,free photo personals,Free Personal Ads,free penpal service,free onling dating,dog,free online dating site,Free Online Dating Services,free web site,freedating,dating websites,datingdirect uk online,girl friend,girl,digg,directories,games,discreet,discussion forums,friendfinder,friend finder,free online chat,e-dating,filipina ladies,female friends,Eharmony October 2007 Promotional Codes,farmersonly,farmers dating,facebook,Eharmony promo code,Eharmony Promotional Code,entertainment,Emode,email,filipina lady,filipina penpal,Eharmony 3 month for the price of 1 Prom,Eharmony Code,free chat,Eharmony Coupon Code and online dating. |
