{"id":81498,"date":"2023-09-26T03:01:16","date_gmt":"2023-09-26T01:01:16","guid":{"rendered":"https:\/\/blog.bluebeam.com\/se\/?p=81498"},"modified":"2023-09-15T09:16:27","modified_gmt":"2023-09-15T07:16:27","slug":"can-hempcrete-be-part-of-constructions-sustainability-solution","status":"publish","type":"post","link":"https:\/\/blog.bluebeam.com\/se\/can-hempcrete-be-part-of-constructions-sustainability-solution\/","title":{"rendered":"Kan hampabetongen bli en del av byggbranschens h\u00e5llbarhetsl\u00f6sning?"},"content":{"rendered":"\n

Byggbranschen kritiseras ofta f\u00f6r att ligga efter<\/a> andra sektorer n\u00e4r det g\u00e4ller att dra nytta av ny teknologi.<\/p>\n\n\n\n

Men \u00e4ven om branschen ligger n\u00e5got efter teknologikurvan, har den gasen i botten n\u00e4r det g\u00e4ller en allt viktigare aspekt av att leverera de byggnader vi beh\u00f6ver: h\u00e5llbarheten.<\/p>\n\n\n\n

I en global unders\u00f6kning<\/a> svarade n\u00e4rmare h\u00e4lften (47 %) av de tillfr\u00e5gade inom teknik- och byggbranschen att h\u00e5llbarhet var en prioritet n\u00e4r de funderade p\u00e5 hur ett projekt skulle tacklas.<\/p>\n\n\n\n

Med tanke p\u00e5 hur mycket v\u00e4rlden p\u00e5verkas av den byggda milj\u00f6n, inte minst eftersom den st\u00e5r f\u00f6r 25 % av Storbritanniens \u00e5rliga koldioxidutsl\u00e4pp, \u00e4r ambitionen att leverera bost\u00e4der, kommersiella lokaler, kontor och infrastruktur p\u00e5 ett h\u00e5llbart s\u00e4tt en accepterad del av tankeg\u00e5ngarna i branschen. Fr\u00e5gan \u00e4r hur man g\u00f6r.<\/p>\n\n\n\n

Hampabetongens h\u00e5llbarhetsmeriter<\/strong><\/h2>\n\n\n\n

Viktiga \u00f6verv\u00e4ganden p\u00e5 byggbranschens h\u00e5llbarhetschecklista \u00e4r vilka material som ska ing\u00e5 i ett projekt, hur de utvinns och produceras, dessa processers inverkan p\u00e5 klimatet och hur materialen fungerar n\u00e4r de v\u00e4l \u00e4r p\u00e5 plats.<\/p>\n\n\n\n

St\u00e5l och betong h\u00f6r f\u00f6rst\u00e5eligt nog till de vanligast f\u00f6rekommande komponenterna n\u00e4r man bygger, tack vare materialens l\u00e5nga livsl\u00e4ngd och h\u00f6ga h\u00e5llfasthet. Tillverkningen av dessa material leder dock till betydande koldioxidutsl\u00e4pp. N\u00e4r det g\u00e4ller st\u00e5l orsakade den globala produktionen 2019<\/a> 3,4 miljarder ton koldioxidutsl\u00e4pp<\/sub> \u2013 mellan 7 % och 11 % av den totala m\u00e4ngden globalt, medan betongproduktionen st\u00e5r f\u00f6r omkring 8 %.<\/p>\n\n\n\n

\u00c4ven om man kommer att forts\u00e4tta att anv\u00e4nda de h\u00e4r materialen, b\u00f6rjar man r\u00f6ra sig mot andra som \u00e4r mer h\u00e5llbara och mindre f\u00f6rorenande. Tillsammans med tr\u00e4 och alternativ till traditionellt tillverkade tegelstenar<\/a> \u00e4r hampa ytterligare en h\u00e5llbar resurs.<\/p>\n\n\n\n

Hampav\u00e4xten, med det latinska namnet Cannabis sativa<\/a>, omvandlas till ett betongliknande material genom att man blandar stj\u00e4lkens tr\u00e4liknande innand\u00f6me, som kallas hurd, med vatten och kalk, vilket fungerar som ett bindemedel. N\u00e4r det har h\u00e4rdats \u00e4r hampabetong l\u00e4tt och h\u00e5llbart, \u00e4ven om det konstruktionsm\u00e4ssigt inte \u00e4r lika h\u00e5llfast som traditionell betong.<\/p>\n\n\n\n

Och om n\u00e5gon skulle vara orolig f\u00f6r att drabbas av de hallucinogena effekterna av att befinna sig i en byggnad tillverkad av hampa \u00e4r det v\u00e4rt att notera att den industriella variant som anv\u00e4nds i byggbranschen har mycket l\u00e4gre koncentrationer av tetrahydrocannabinol, THC, som \u00e4r det \u00e4mne som g\u00f6r m\u00e4nniskor h\u00f6ga: 0,3 % j\u00e4mf\u00f6rt med 5 % till 10 %.<\/p>\n\n\n\n

Hampans milj\u00f6meriter \u00e4r imponerande. Enligt en artikel<\/a> av Salim Barbhuiya p\u00e5 Department of Engineering and Construction vid University of East London och Bibhuti Bhusan Das p\u00e5 Civil Engineering Department vid National Institute of Technology Surathkal i Indien, \u00e4r det h\u00e4r \u201dett av f\u00e5 material som kan forts\u00e4tta att absorbera koldioxid efter att man har anv\u00e4nt det f\u00f6r att bygga, och som binder mer koldioxid ur atmosf\u00e4ren under byggnadens livstid \u00e4n vad som sl\u00e4pptes ut vid konstruktionen\u201d.<\/p>\n\n\n\n

Salim och Bibhuti p\u00e5pekar att hampa v\u00e4xer fort, kan odlas och sk\u00f6rdas p\u00e5 bara 60 dagar och materialet \u201d\u00e4r koldioxidnegativt, det vill s\u00e4ga binder koldioxid, eftersom hampav\u00e4xten absorberar mer koldioxid ur atmosf\u00e4ren \u00e4n den sl\u00e4pper ut under tillverkningen och anv\u00e4ndningen p\u00e5 plats\u201d.<\/p>\n\n\n\n

F\u00f6r- och nackdelar<\/strong><\/h2>\n\n\n\n

Hampabetong har anv\u00e4nts i Europa under ett antal \u00e5r. Materialet erbjuder naturlig, luftt\u00e4t isolering<\/a>, kan reglera en byggnads fuktighetsniv\u00e5 p\u00e5 naturlig v\u00e4g, \u00e4r brandbest\u00e4ndigt och passar perfekt i regioner d\u00e4r det finns risk f\u00f6r jordb\u00e4vningar eftersom det \u00e4r motst\u00e5ndskraftigt mot sprickor.<\/p>\n\n\n\n

Men \u00e4ven om hampabetongens gr\u00f6na meriter \u00e4r tydliga, finns det vissa nackdelar med att anv\u00e4nda det ist\u00e4llet f\u00f6r \u201driktig\u201d betong. En nackdel \u00e4r att hampabetong bara har 15 % av den traditionella betongens densitet, och dess tryckh\u00e5llfasthet \u00e4r bara en tjugondel av bostadsbetongens. Det betyder att i m\u00e5nga situationer skulle anv\u00e4ndningen av hampabetong beh\u00f6va kompletteras med st\u00f6dramar av andra material. Annars f\u00e5r man anv\u00e4nda det som fyllnadsmaterial.<\/p>\n\n\n\n

Samtidigt ber\u00e4knas kostnaderna f\u00f6r att bygga med hampabetong vara omkring 10 %<\/a> h\u00f6gre \u00e4n f\u00f6r traditionell betong. Och n\u00e4r man blandar till materialen finns det risk f\u00f6r hudirritation, \u00e4ven om hampabetongens f\u00f6respr\u00e5kare understryker att detta beror p\u00e5 att man anv\u00e4nder kalk, och kan motverkas genom att anv\u00e4nda kraftiga handskar och munskydd.<\/p>\n\n\n\n

De h\u00e4r faktorerna b\u00f6r dock inte avskr\u00e4cka branschen fr\u00e5n att \u00f6verv\u00e4ga att anv\u00e4nda hampabetong d\u00e4r det \u00e4r m\u00f6jligt och n\u00e4r f\u00f6ruts\u00e4ttningarna finns, s\u00e4rskilt nu n\u00e4r effekterna av den v\u00e4xande klimatkrisen blir allt tydligare.<\/p>\n\n\n\n

Hampabetongens l\u00e5ngsiktiga potential<\/strong><\/h2>\n\n\n\n

I en artikel med titeln Opportunities and challenges of hempcrete as a building material for construction: An overview<\/a> menar forskarna Madhura Yadav och Ayushi Saini att hampans f\u00f6rm\u00e5ga att v\u00e4xa fort utan att kr\u00e4va mycket vatten f\u00f6r sin utveckling inneb\u00e4r att det skulle kunna bli ett idealiskt material i de delar av v\u00e4rlden d\u00e4r tillg\u00e5ngen p\u00e5 vatten \u00e4r begr\u00e4nsad, det vill s\u00e4ga de omr\u00e5den d\u00e4r man regelbundet upplever perioder av torka.<\/p>\n\n\n\n

Samtidigt visar en annan unders\u00f6kning, The potential of hemp buildings in different climates: A comparison between a common passive house and the hempcrete building system<\/a>, av forskare vid Uppsala universitet att byggnader av hampabetong ocks\u00e5 klarar sig bra i varmare klimat.<\/p>\n\n\n\n

\u201dDen stora termiska tr\u00f6gheten och fuktbuffringen hos materialet bidrar till att stabilisera temperaturerna och luftfuktigheten inomhus.\u201d<\/p>\n\n\n\n

\u201dDen l\u00e5ga effusiviteten s\u00e4nker ocks\u00e5 ytv\u00e4rme\u00f6verf\u00f6ringen, vilket ger en k\u00e4nsla av v\u00e4rme n\u00e4ra v\u00e4ggarna, och de potentiella giftiga utsl\u00e4ppen fr\u00e5n materialet \u00e4r i stort sett obefintliga tack vare dess naturliga sammans\u00e4ttning\u201d, till\u00e4gger forskarna.<\/p>\n\n\n\n

Det \u00e4r uppenbarligen osannolikt att hampabetongen kommer att konkurrera ut den traditionella betongen inom en snart framtid. Men dess potential inneb\u00e4r ytterligare ett steg mot en mer h\u00e5llbar byggbransch, och av det sk\u00e4let \u00e4r den v\u00e4rd att \u00f6verv\u00e4ga.<\/p>\n\n\n\n

Ett osannolikt byggmaterial som ocks\u00e5 smakar bra p\u00e5 en hamburgare<\/h2>
<\/div><\/div>
L\u00e4s mer h\u00e4r<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Traditionella byggmaterial som st\u00e5l och betong \u00e4r bepr\u00f6vade i byggbranschen, men de medf\u00f6r en betydande milj\u00f6kostnad. 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