Gwajin shuɗin methylene na laka, tsakuwa da yashi, da ƙasa

Wani mai samar da kankare ya ƙi karɓar yashin da aka kawo saboda ƙimarsa ta shuɗin methylene ta wuce iyakar da aka kayyade. Mai kawo kayan ya nuna rashin amincewa: dakin gwaje-gwajensu ya auna ƙima mafi ƙanƙanta a wannan yashin. Duk dakunan gwaje-gwajen biyu sun yi amfani da shuɗin methylene. Dukansu sun bayar da sakamako a gram a kowace kilogram. Sai dai ɗaya ne kawai ya gwada rukunin girman barbashin da aka ambata a takardar ƙayyadaddun sharudda, don haka tun farko lambobin biyu ba su dace a kwatanta su ba.

Wannan kuskure ya samo asali ne daga yadda ake fahimtar gwajin. “Gwajin shuɗin methylene” yana sa a yi tunanin kayan auna guda ɗaya mai ma'auni guda ɗaya. A zahiri, rukuni ne na hanyoyin gwaji da suke amfani da rini ɗaya amma suke auna abubuwa daban-daban: kayan daban-daban, rukunin girman barbashi daban-daban, wuraren ƙarewar gwaji daban-daban, da tushen bayar da rahoto daban-daban. Kuskuren shi ne ɗaukar cewa amfani da rini mai suna ɗaya yana nufin sakamakon ɗaya ne. Sassan da ke ƙasa sun bambanta waɗannan hanyoyi domin mai karatu ya iya zaɓar hanyar da ta dace da kayan da yake da su, ya kuma fahimci kowace ƙima bisa abin da take wakilta.

Abin da rinin yake bincikawa a zahiri

Shuɗin methylene rini ne mai caji tabbatacce. Ma'adanai na laka masu saman da ke da ƙarfin mu'amala suna manne shi sosai a samansu, yayin da quartz da sauran ƙananan barbashi marasa saurin mu'amala suke ɗaukar ƙasa da haka sosai. Saboda haka, ƙara rini kaɗan-kaɗan a gaurayen ruwa da barbashi da ake motsawa yana yin titrashan na saman mai mu'amala: rinin da bai manne ba yana bayyana a ruwan ne kawai bayan an cika wuraren manne masu mu'amala. Wannan ne ya sa gwajin laka da shuɗin methylene yake amsa ga yawa da yanayin ma'adanai na laka masu mu'amala, ba ga jimillar ƙananan barbashi kaɗai ba.

Abubuwa biyu suna biyo baya. Na farko, sakamakon ya dogara da barbashin da suke cikin ɓangaren samfurin da aka gwada. Hanyar da take gwada rukunin 0/2 mm da hanyar da take gwada ƙurar da ta fi ƙanƙanta kawai za su bayar da lambobi daban-daban daga samfurin gaba ɗaya ɗaya, saboda rabon laka a cikinsu ya bambanta. Na biyu, raka'ar da aka bayar da rahoto da ita tana da ma'ana ne kawai idan an haɗa ta da wannan rukunin girman barbashi. Tambayar “gram na rini a kowace kilogram ta mene ne, ainihi?” wani ɓangare ne na sakamakon. Jagorar da ke tare da wannan kan auna mannewar shuɗin methylene a saman abu ta yi ƙarin bayani kan yadda wannan ɗaukar rini yake faruwa.

Gwajin tsakuwa da yashi: EN 933-9 yana ayyana ƙimomi biyu, ba ɗaya ba

Ƙa'idar da ake komawa gare ta a Turai ita ce EN 933-9, Gwaje-gwajen siffofin lissafin girma na tsakuwa da yashi, Sashe na 9: Tantance ƙananan barbashi, Gwajin shuɗin methylene. Bugun da ake amfani da shi yanzu shi ne EN 933-9:2022, wanda ya maye gurbin bugun 2009 tare da gyaransa na 2013, kuma an taƙaita iyakar abin da ya ƙunsa a shafin ƙa'idojin CEN da CENELEC. Ƙa'idar tana ayyana ƙimomi biyu mabambanta. Ana ƙayyade MB a kan rukunin 0/2 mm. Ana ƙayyade MB_F, wanda aka bayyana a ƙarin sashe mai ɗauke da sharuddan ƙa'idar, a kan rukunin 0/0.125 mm. Kiran sakamakon 0/2 mm “MB_F” kuskuren rarrabawa ne, ba zaɓin yadda za a zagaye lamba ba.

A hanyar gwajin, ana gauraya ɓangaren samfurin da za a gwada a cikin kusan 500 mL na ruwa, sannan a ƙara rini daga magani mai ƙarfin 10 g/L yayin motsawa. Bayan kowace ƙarin rini, mai gudanar da gwajin yana ɗora ɗigo na gaurayen a kan takardar tacewa da aka kayyade. Ana tantance ƙarshen gwajin da sanannen gwajin ɗigo: rinin da bai manne ba yana bayyana a matsayin zoben shuɗi mai haske mai faɗin kusan 1 mm a kewaye da ɗigon tsakiya, wanda yake dawwama na mintuna biyar. Ana bayar da sakamako a gram na shuɗin methylene a kowace kilogram ta busasshen rukunin barbashin da aka gwada. Saboda haka, MB yana da raka'o'in g/kg na kayan 0/2 mm, yayin da MB_F yake da g/kg na kayan 0/0.125 mm. Yashi ɗaya zai iya cika sharadin MB amma ya kasa cika na MB_F; wannan ne ainihin dalilin da ya sa takardar ƙayyadaddun sharudda dole ta ambaci ƙimar da take nufi.

Hanyoyin gwajin tsakuwa da yashi na Amurka suna amfani da ka'idojin aiki daban-daban

A Amurka, hanyoyi biyu suna yin gwaje-gwaje makamanta da kayan aiki daban-daban. ASTM C1777-20, wanda ASTM ya nuna har yanzu yana aiki, yana ƙayyade ƙimar shuɗin methylene na kayan da suke ratsa rariyar 4.75 mm (No. 4) ta amfani da na'urar auna launi a 610 nm, maimakon gwajin ɗigo a takardar tacewa. AASHTO T 330, wanda ake samu ta shagon AASHTO, yana amfani da ganin ƙarshen gwajin ɗigo da ido, kuma yana gwada rukunin barbashin da suke ratsa 75 µm. Dukansu suna bayar da rahoton yawan rinin da aka ɗauka a kowace raka'ar nauyi, wanda ta fuskar nau'in raka'a ya yi daidai da gram a kowace kilogram, amma ASTM ya yi gargaɗi a sarari cewa sakamakon C1777, AASHTO T 330, da EN 933-9 na iya bambanta sosai. An ayyana ɓangarorin samfurin da ake gwadawa ta hanyoyi daban-daban, rabon laka a cikinsu ya bambanta, kuma karatun na'urar auna launi ba aiki ɗaya ba ne da tantance zobe a kan takarda.

Don haka, ga mai sayen yashi, fassarar gwajin shuɗin methylene na tsakuwa da yashi a aikace tana da sharaɗi: lambar tana tantance laka mai mu'amala da za ta iya cutar da ingancin kayan a cikin rukunin barbashin da aka kayyade, bisa hanyar da aka kayyade. Dakin gwaje-gwajen da yake gwada wani rukunin barbashi dabam, ko yake tantance ƙarshen gwajin bisa wata ƙa'idar aiki dabam, yana yin wani gwaji dabam ne ko da kwalbar rinin iri ɗaya ce.

Gwajin ƙasa: VBS na Faransa ya shafi aikin ƙasa, ba kankare ba

Ƙasa tana da nata hanyar a cikin wannan rukunin gwaje-gwaje. Ƙimar shuɗin ƙasa, wato valeur de bleu de sol da ake taƙaitawa da VBS, tana auna yawan shuɗin methylene da ƙasa take ɗauka domin rarraba ta a ayyukan ƙasa da gina hanyoyi. Hanyar da aka yi amfani da ita a baya ita ce ƙa'idar Faransa NF P94-068, wadda aka jera a kundin AFNOR. An janye wannan ƙa'idar ta 1998 kuma NF EN 17542-3:2022 ta maye gurbinta. Saboda haka, hanyar da take ambaton NF P94-068 ba tare da duba bugun yanzu ba tana aiki ne da takardar da aka maye gurbinta.

Gwajin ɗigo na VBS yana kama da gwajin ɗigo na tsakuwa da yashi: ana ƙara rini bi da bi a gaurayen ƙasa da ruwa, ana ɗora ɗigogi a takardar tacewa har sai zoben gefen da yake dawwama ya bayyana. Amma abin da ake aunawa ya bambanta. Dakin gwaje-gwajen yana gwada ɓangaren 0/5 mm, kuma bisa al'ada ana bayyana VBS a gram na shuɗin a kowace 100 g na busasshiyar ƙasa, bisa kayan 0/50 mm. Kada a sauya VBS zuwa ƙimar MB ta EN 933-9 ta hanyar ninkawa ko rabawa da goma. Ninkawa ko rabawa da goma yana sauya raka'o'i ne; ba ya sauya rukunin barbashi, shirye-shiryen samfurin, ko tushen da aka daidaita sakamakon a kansa. VBS na ƙasa da MB na tsakuwa da yashi suna amsa tambayoyin injiniya daban-daban, kuma kowace iyaka ta shafi nata hanyar gwaji ne.

Bentonite da laka ta haƙowa: ƙarfin mu'amala da ƙarfin ɗauka, ba tsafta ba

Reshe na uku na wannan rukunin gwaje-gwaje ba shi da alaƙa da karɓa ko ƙin karɓar tsakuwa da yashi. A ruwan haƙowa, gwajin shuɗin methylene na laka ta haƙowa yana auna yawan laka mai mu'amala da ruwan ya riga ya ƙunsa, daga bentonite na kasuwanci da kuma daskararrun barbashi masu mu'amala da suka fito daga haƙowa, yana kuma ƙiyasta jimillar ƙarfin musayar ions masu caji tabbatacce. Hanyar da ake amfani da ita yanzu tana cikin API RP 13B-1, Gwajin ruwan haƙowa mai tushen ruwa, wanda bugunsa na shida yake da kwanan watan Janairu 2026; kundin ƙa'idojin API shi ne madogara mai iko wajen sanin bugun da yake aiki. Ana sanya samfurin laka ya zama mai acid sannan a yi masa aiki da hydrogen peroxide domin cire sinadaran halitta masu kawo cikas, sa'an nan a yi titrashan da rini har zuwa bayyanar zobe a takardar tacewa. Ana bayar da sakamakon, wato ƙarfin ɗaukar shuɗin methylene, bisa ƙarar ruwan haƙowa. Ana iya sauya shi zuwa adadin bentonite mai daidai da shi bisa zato da aka bayyana game da ƙarfin musayar bentonite.

Ana kuma tantance busasshen bentonite kansa ta wata hanya dabam. API RP 13I ya ƙunshi gwaje-gwajen dakin gwaje-gwaje, ciki har da hanyar shuɗin methylene a kan bentonite da aka watse barbashinsa a ruwa, wadda take bayar da ƙiyasin ƙarfin musaya a milliequivalents a kowace 100 g. ASTM C837, Daidaitacciyar Hanyar Gwaji don Ma'aunin Shuɗin Methylene na Laka, wanda sabon bita nasa shi ne C837-09(2024) kuma har yanzu yana aiki, yana auna mannewar rini a saman lakar kanta. Yana kuma bayyana ma'aunin a matsayin mai alaƙa da ƙarfin musayar ions masu caji tabbatacce da sauran siffofin laka. Waɗannan ma'aunai ne na ƙarfin mu'amalar laka. Amfani da iyakar tsaftar tsakuwa da yashi wajen tantance ma'aunin bentonite, ko amfani da ƙarfin ɗaukar bentonite wajen tantance laka ta haƙowa, yana maimaita kuskuren farko ne da wasu kayan daban.

Kwatanta hanyoyin gwaji

Teburin da ke ƙasa shi ne tushen bayanan da za a koma gare shi a wannan maƙala. Kafin kwatanta lambobi biyu, tabbatar cewa bayanan layukansu sun yi daidai.

Bincika bugun kowace ƙa'ida kafin wallafa hanyar gwaji daga wannan tebur. Ana yin bitar ƙa'idoji, kuma teburin yana nuna bugun da aka tabbatar da su lokacin bincike ne, ba jerin manazarta na dindindin ba. An bayyana sauran amfani da rinin wajen gwajin kayan, ciki har da gwaje-gwajen membrane da polymer, a jagorar da ke tare da wannan kan gwajin kayan da shuɗin methylene.

Dalilin da ya sa iyakar wata hanya ba ta taɓa aiki kai tsaye a wata ba

Mu koma ga yashin da aka ƙi karɓa. A ce an rubuta iyakar ƙayyadaddun sharudda ne don EN 933-9 MB a kan 0/2 mm, yayin da dakin gwaje-gwajen mai kawo kayan ya bayar da rahoton MB_F a kan 0/0.125 mm, ko wata ƙima ta auna launi bisa ASTM C1777. Rukunin barbashin da ya fi ƙanƙanta yana tattara laka a kaso mafi yawa, don haka ƙimarsa tana ƙaruwa saboda yadda aka tsara gwajin; na'urar auna launi kuma tana karanta wani siginar zahiri dabam da zoben. Kowanne daga cikin waɗannan bambance-bambancen shi kaɗai zai iya sauya sakamakon daga cika sharadi zuwa kasa cikawa. Rigimar ba kan wanda ya fi yin titrashan da kyau ba ce. Ta shafi abubuwa biyu daban-daban da ake aunawa ne waɗanda suke amfani da rini mai suna ɗaya.

Saboda haka, ƙa'idar tana da tsauri. Iyakar ƙayyadaddun sharudda tana aiki ne kawai ga hanyar gwaji, rukunin barbashi, da tushen bayar da rahoton da suka samar da ita. Kafa iyaka a ƙarƙashin hanyar da za ta maye gurbin wata yana buƙatar dangantaka da aka tabbatar ta gwaji, ta amfani da kayan da suke wakiltar nau'in kayan da ake son tantancewa kuma aka gwada da hanyoyin biyu, ba sauya raka'a kawai ba. Kuma saboda gwajin shuɗin methylene na laka mai mu'amala yana amsa ga yanayin laka da kuma yawanta, ko da kyakkyawar dangantaka da aka samu daga wata madogarar kayan ƙasa guda ɗaya na iya kasa aiki a wata.

Taƙaitaccen jerin abubuwan dubawa kafin gwaji

Rubuta kayan, ƙa'idar tare da shekarar bugunta, rukunin barbashin da za a gwada, ƙa'idar tantance ƙarshen gwaji, da tushen bayar da rahoto kafin shirya kowane magani. Tabbatar da cewa bugun da aka ambata shi ne na yanzu wajen hukumar da ta fitar da shi. Sa'an nan a shirya ƙarfin rini, daidaitawar ma'auni, da samfurorin tabbatar da ingancin gwaji da suka dace da wannan hanyar. Rahoton da ya bayyana waɗannan abubuwa biyar yana ba kowane mai karatu damar maimaita aunawar, kuma yana hana amfani da sunan rini a madadin bayanin hanyar gwaji.