Lehu lele o ka sima Portland

Sima Portland
Lehu lele ʻO ka sima portland e pili ana i ka hui pū ʻana o ka clinker sima Portland a me ka lehu lele, i hui pū ʻia me ka nui kūpono o ka gypsum a laila wili ʻia, i kapa inoa ʻia ʻo PF ʻO kēlā me kēia mea sima hydraulic i hana ʻia me ka clinker sima Portland, ka lehu lele a me ka nui kūpono o ka gypsum lepo i kapa ʻia ʻo ka lehu lele. ʻO ka sima Portland, i kapa inoa ʻia ʻo PF ʻO ka nui o ka lehu lele i hoʻohui ʻia i ka sima he 20% ~ 40% ma ke kaumaha, a ʻo kona ikaika a me nā koi ikaika i kēlā me kēia makahiki ua like ia me nā mea o ka sima Portland slag.

Mea maka
Hana ʻia ia me ka clinker sima Portland a me lehu lele, i kāwili ʻia me ka nui kūpono o ka gypsum a laila wili ʻia. Code PF
ʻO kēlā me kēia mea sima hydraulic i hana ʻia me ka clinker sima Portland, ka lehu lele a me ka nui kūpono o ka gypsum lepo i kapa ʻia ʻo ka lehu lele ʻo Portland cement, i kapa inoa ʻia ʻo PF ʻO ka nui o ka lehu lele i hoʻohui ʻia i ka sima he 20% a 40% ma ke kaumaha. ʻAe ʻia e komo i loko o ka slag umu pahū granulated ʻaʻole i ʻoi aku ma mua o 1/3 o ka nui o nā mea i hui ʻia. I kēia manawa, hiki i ka nui o nā mea i hui ʻia ke hiki i 50%, akā ʻaʻole pono ka nui o ka lehu lele ma lalo o 20% a ʻoi aku paha ma mua o 40%.
Nā Hiʻohiʻona
He ʻano mānoanoa ke ʻano o ka sima lehu lele, he liʻiliʻi ka ʻili kikoʻī o loko, a he liʻiliʻi loa ka hiki ke hoʻopili ʻia no ka wai, a he liʻiliʻi ke koi wai no ka hydration o ka sima, no laila he liʻiliʻi ka emi ʻana o ka maloʻo o ka sima lehu lele, a he haʻahaʻa hoʻi ke kūpaʻa o ka māwae. maikaʻi. Eia kekahi, e like me ka sima maʻamau i hui pū ʻia me nā mea hoʻohuihui hana, he haʻahaʻa ka wela hydration a he kūpaʻa ikaika i ka palaho.
Hana
ʻO nā ʻano kūikawā o ka sima Portland lehu lele penei:
(1) Haʻahaʻa ka ikaika mua, a nui ka piʻi ʻana o ka ikaika hope: haʻahaʻa ka ikaika mua o ka sima lehu lele, a emi nui ka ikaika mua me ka piʻi ʻana o ka nui o ka lehu lele. No ka mea, he paʻa loa ke kino vitreous i loko o ka lehu lele, ua hoʻopau mālie ʻia a luku ʻia nā ʻāpana lehu lele e Ca(OH)2 i ka wā o ke kaʻina hana hydration o ka sima lehu lele, no laila, ʻike nui ʻia ka hoʻomohala ʻana o ka ikaika o ka sima lehu lele i ke kahua hope. , nui ka piʻi ʻana o kona ikaika hope, a hiki ke ʻoi aku ma mua o ka ikaika hope o ka sima Portland like.
(2) Hana maikaʻi a me ka emi iki ʻana o ka maloʻo: No ka mea, ʻo ka hapa nui o nā ʻāpana lehu lele he poepoe a paʻa, a he liʻiliʻi ka ʻili o loko a me ka wai adsorption molekole hoʻokahi, he hana maikaʻi ka sima lehu lele a me ka emi iki ʻana o ka maloʻo. , he mau ʻano o ka ikaika tensile kiʻekiʻe a me ke kūpaʻa maikaʻi i ka haki. He pōmaikaʻi maopopo kēia o ka sima lehu lele.
(3) Kū'ē maika'i i ka pala: he ki'eki'e ke kūpa'a o ka sima lehu lele i ka wai hou a me ka sulfate. Ma muli o ka hui pū'ana o ka SiO2 ikaika i loko o ka lehu lele a me Ca(OH)2, ho'opuka'ia ka calcium silicate hydrate ke kaulike'ia. 'Oi aku ka ha'aha'a o ka palena palena i koi'ia ('o ia ho'i ka alkalinity pae wai) ma mua o ka mea i koi'ia no ke kaulike o ka calcium silicate hydrate i loko o ka sima Portland ma'amau, no laila ua ho'emi nui'ia ka nui o ka leaching i loko o ka wai hou, a laila e ho'omaika'i ana i ke kūpa'a o ka sima. Ka hiki ke pala o ka wai hou a me ke kūpa'a i ka hō'ino sulfate.
(4) Haʻahaʻa ka wela o ka hydration: Lohi ka wikiwiki o ka hydration o ka sima lehu lele a haʻahaʻa ka wela o ka hydration, ʻoiai inā nui ka nui o ka lehu lele i hoʻohui ʻia, ʻike maopopo ʻia ka emi ʻana o ka wela o ka hydration.

Sima Portland
ʻO nā clinker sima Portland āpau i hana nui ʻia me ka calcium silicate, ka limestone a i ʻole ka granulated blast furnace slag me ka emi ma mua o 5%, a me nā mea sima hydraulic i hana ʻia me ka gypsum i wili maikaʻi ʻia ua kapa ʻia ʻo Portland cement. ʻIke ʻia ma ka honua holoʻokoʻa ʻo Portland Cement.
Hoʻokaʻawale ʻana
Ua māhele ʻia ka sima Portland i ʻelua ʻano, ʻo ke ʻano I ʻo ka sima Portland me ka ʻole o nā mea i hui ʻia ua kapa ʻia ʻo ka sima Portland, code P·I; ʻo ka mea i hui ʻia me ka limestone a i ʻole ka ʻōpala umu pahū granulated ʻaʻole i ʻoi aku ma mua o 5% o ka nui o ka sima ua kapa ʻia ʻo II ʻAno Portland cement, code P·Ⅱ.
Ka hoʻohuihui mineral
ʻO ka haku mele nui o ka sima Portland: tricalcium silicate, dicalcium silicate, tricalcium aluminate, a me tetracalcium ferric aluminate. Hoʻoholo ka Tricalcium silicate i ka ikaika o ka sima Portland i loko o ʻehā pule; hoʻopuka wale ka dicalcium silicate i kona ikaika ma hope o ʻehā pule, a hiki i ka ikaika o ka tricalcium silicate no ʻehā pule ma kahi o hoʻokahi makahiki; ʻoi aku ka wikiwiki o ka ikaika o ka tricalcium aluminate, akā haʻahaʻa ka ikaika, a he kuleana koʻikoʻi kona i ka ikaika o ka sima Portland i loko o 1 a 3 mau lā a i ʻole ka lōʻihi iki; He liʻiliʻi ka hāʻawi ikaika o ka sima paʻakai waikawa.