I te wa e hangai ana te waikawa polycarboxylic i runga i te tino kakama te superplasticizer(kaihoko whakaheke wai) ka whakauruhia ki roto i te nui o te 0.2% ki te 0.3% o te papatipu o te rauemi cimentitious, ko te tere whakaheke wai ka taea te nui ki te 25% ki te 45%. I te nuinga o te wa e whakaponohia ana ko te waikawa polycarboxylic-a-waikawa-nui-a-te-whakaheke-wai he hanganga heru, e whakaputa ana i te aukati aukati ma te whakauru i runga i nga matūriki ciment, i nga hua hydration ciment ranei, ka whai waahi ki te whakamarara me te pupuri i te marara o te sima. Ko te rangahau mo nga ahuatanga whakauru o nga mea whakaheke wai i runga i te mata o nga matūriki gypsum me o raatau tikanga whakamaarama-whakamaramatanga kua whakaatuhia ko te waikawa polycarboxylic-a-waikawa-a-te-nui-a-te-nui-a-te-wai-whakaheke he heru heru, me te iti o te whakauru i runga i te mata o te gypsum me te ngoikore o te kaha o te whakaheke hiko. Ko tana paanga marara te nuinga ka ahu mai i te awenga aukati o te paparanga adsorption. Ko te whakamararatanga i puta mai i te paanga aukati steric he iti ake te pa ki te wai o te gypsum, na reira he pai te mararatanga.
Ko te ciment he mana whakatairanga-whakatairanga i roto i te gypsum, ka tere ake te wa whakarite o te gypsum. Ka nui ake te inenga ki te 2%, ka whai paanga nui ki te wai o te wa o mua, ka heke te wai i te pikinga o te inenga ciment. I te mea ka whai hua te ciment ki runga i te gypsum, hei whakaiti i te paanga o te wa whakatuu gypsum ki runga i te wai o te gypsum, ka taapirihia te nui o te gypsum retarder ki te gypsum. Ka piki te rere o te gypsum i te pikinga o te inenga ciment; ko te taapiri o te ciment ka piki ake te kawakoretanga o te punaha, ka tere ake te wehewehe o te whakaheke wai i roto i te punaha, ka tino whakanuia te hua whakaheke wai; i te wa ano, i te mea he iti te hiahia o te wai mo te ciment ake, he rite ki te whakanui ake i te ōwehenga wai-ciment i raro i te nui o te taapiri wai, ka piki ake ano te rere o te wai.
He tino pai te whakamararatanga o te wai whakaheke polycarboxylate ka taea te whakapai ake i te rere o te gypsum i te inenga iti. Na te pikinga o te inenga, ka tino piki te rere o te gypsum. Ko te whakaheke wai polycarboxylate he kaha whakamuri. Na te pikinga o te inenga, ka tino piki ake te waa whakarite. Na te kaha whakamuri o te whakaheke wai polycarboxylate, i raro i te owehenga wai-ki-ciment, ko te pikinga o te inenga ka puta te rerekee o nga tioata gypsum me te wetewete o te gypsum. Ka heke te kaha flexible me te kaha o te gypsum i te pikinga o te inenga.
Ko te polycarboxylate ether te whakaheke i te wai-whakaheke i te wai ka whakaroa i te whakatakotoranga o te gypsum me te whakaiti i tona kaha. I te wa ano, ko te taapiri i te sima, te konupūmā konupūmā waikura ranei ki te gypsum ka pai ake te rere. Ko tenei ka whakaheke i te wai-ki-ciment ōwehenga, ka whakanui ake i te kiato o te gypsum, na reira tona kaha. I tua atu, ko te whakakaha o nga hua whakamakuku sima ki runga i te gypsum ka piki ake te kaha o te whakaheke me te pupuhi. Ko te whakanui ake i te nui o te ciment me te konupūmā waikura ka piki ake te rere o te gypsum, me te nui o te ciment ka taea te whakapai ake i tona kaha.
I te wa e whakamahi ana i te polycarboxylate ether wai-whakaiti i roto i te gypsum, ko te taapiri i te rahinga sima e tika ana ehara i te mea ka piki ake te kaha engari ka nui ake te rere o te wai me te iti o te paanga ki te waa whakatuu.
Te wa tuku: Akuhata-06-2025