A cikin yanayi na yau da kullun, daidaiton girma na simintin daidai yana shafar abubuwa da yawa kamar tsarin siminti, kayan siminti, yin mold, yin harsashi, yin burodi, zuba, da sauransu. Duk wani saiti ko aiki mara dacewa na kowane mahaɗi zai canza ƙimar raguwar simintin. Wannan yana haifar da karkacewa a cikin daidaiton girma na simintin daga buƙatun. Ga abubuwan da ke iya haifar da lahani a cikin daidaiton girma na simintin daidai:
(1) Tasirin tsarin siminti: a. Kauri na bangon siminti, babban saurin raguwa, siririn bangon siminti, ƙaramin saurin raguwa. b. Yawan raguwa kyauta yana da girma, kuma ƙimar raguwar da ke hana shi ƙarami ne.
(2) Tasirin kayan siminti: a. Girman sinadarin carbon a cikin kayan, ƙaramar ƙimar raguwar layi, da kuma ƙarancin sinadarin carbon, haka nan ƙimar raguwar layi. b. Yawan raguwar simintin kayan gama gari kamar haka: ƙimar raguwar siminti K=(LM-LJ)/LJ×100%, LM shine girman rami, kuma LJ shine girman siminti. K yana shafar waɗannan abubuwan: ƙirar kakin zuma K1, tsarin siminti K2, nau'in ƙarfe K3, zafin ruwan K4.
(3) Tasirin yin mold akan ƙimar raguwar layi na simintin: a. Tasirin zafin allurar kakin zuma, matsin lamba na allurar kakin zuma, da lokacin riƙe matsi akan girman saka hannun jari shine mafi bayyana a cikin zafin allurar kakin zuma, sannan sai matsin lamba na allurar kakin zuma, kuma ana tabbatar da lokacin riƙe matsi Bayan an samar da saka hannun jari, ba shi da tasiri sosai akan girman saka hannun jari na ƙarshe. b. Matsakaicin raguwar layi na kayan kakin zuma (mold) shine kusan 0.9-1.1%. c. Lokacin da aka adana mold na saka hannun jari, za a sami ƙarin raguwa, kuma ƙimar raguwarsa shine kusan 10% na jimlar raguwar, amma idan aka adana na tsawon awanni 12, girman mold na saka hannun jari yana da tabbas. d. Matsakaicin raguwar radial na mold na kakin zuma shine 30-40% kawai na ƙimar raguwar tsayi. Zafin allurar kakin zuma yana da tasiri mafi girma akan ƙimar raguwar kyauta fiye da ƙimar raguwar da aka hana (mafi kyawun zafin allurar kakin zuma shine 57-59℃, Mafi girman zafin jiki, mafi girman raguwar).
(4) Ana amfani da tasirin kayan yin harsashi: yashi zircon, foda zircon, yashi Shangdian da foda Shangdian. Saboda ƙaramin ma'aunin faɗaɗawa, 4.6×10-6/℃ kawai, za a iya yin watsi da su.
(5) Tasirin yin burodin harsashi: Saboda yawan faɗaɗa harsashin ƙarami ne, lokacin da zafin harsashin ya kai 1150℃, kashi 0.053% ne kawai, don haka za a iya yin watsi da shi.
(6) Tasirin zafin siminti: mafi girman zafin siminti, mafi girman ƙimar siminti, da kuma ƙarancin zafin siminti, ƙaramar ƙimar siminti, don haka zafin siminti ya kamata ya dace.
Lokacin Saƙo: Nuwamba-15-2021