Te mau tao'a tahi mâmâ | Te mau rave'a haaparareraa parau teitei no te cellular concrete
Te taata faatere o te hoê ïa huru anoiraa sima, o te nehenehe e haamaitai i te huru o te raima, faaiti i te faaohiparaa i te ito no te paturaa e ia haamaitai i te aravihi o te paturaa. I roto i te raima, water reducing agent is added to the mixture of cement particles to get dispersion effect and to optimize the working performance of cement. I roto i te huru o te tapearaa i te toparaa simeni, mixing and subtract agent can greatly reduce the unit water use of concrete mixture, reduce the water cement ratio of concrete, the strength and stability of the reinforced concrete. Or in the concrete workability and strength of the same condition, adding water reducer can reduce the unit of cement, save cement. Āre'a, the application of superplasticizer in concrete also has some problems, such as the majority of superplasticizer ions being anionic surfactants, lignin sulfonate, te hu'ahu'a no te naphthalene, e tē vai atura..
According to the water-reducing effect of te mau hu'ahu'a sima, te mau hu'ahu'a sima can be divided into the following three categories:
(1) Te hoê rave'a no te faaiti i te pape, ua pii - atoa - hia ei plasticizer, e ere te faito o te faaitiraa i te pape i te mea iti a'e i te 8%, te lignin sulfonate te tuhaa rahi;
(2) Te hoê rave'a no te faaiti i te pape, ua pii - atoa - hia te reira te superplasticizer, e ere te faito o te faaitiraa i te pape i te 14%, te tuhaa rahi, o te hoê ïa rave'a no te faaiti i te pape;
(3) Te hoê rave'a ha'utiraa teitei, e ere te faito o te faaitiraa i te pape i te 25%, no ni'a i te mau rave'a haaparareraa ati polycarboxylic ei ti'a.
I teie nei, E pae huru i muri nei o te huru apî o te ravea no te faaiti i te pape:
(1) Te mau hu'ahu'a rahi (te tao'a faaiti i te pape ati carboxylic): E rave rahi mekameka i roto i te faanahoraa o te ati poly carboxylic i rotopu i te mau hu'ahu'a o te pape o te faaiti mai i te tahi mau hu'ahu'a puai i roto i te mau anions mekameka rahi e te hoê tuhaa uira. The formation of hydration film can not only enhance the adsorption force between molecules but also produce space steric effect as well as good plasticizing effect. But this water reducer is expensive, which makes its application be limited to some extent, and make it has strong selectivity to defoaming agent and air-entraining agent. I teie nei, the polycarboxylate superplasticizer with the best comprehensive efficiency is the high performance superplasticizer.
(2) Naphthalene series high-efficient superplasticizer: naphthalene series high-efficient superplasticizer has electrostatic repulsion effect, molecular repulsion between electric charges, just on the cement in the hydration process of its own flocculation has a certain decomposition effect, so that free water drainage it contained would be reduced, e e mea papu maitai te faahopearaa o te faaitiraa mai i te pape. Ia faaauhia i te mau hu'ahu'a ati polycarboxylic, Te vai ra te hoê ravea aravihi apî paari e te hoo iti o te naphthalene.
(3) Te mau hu'ahu'a atomi aminosulfonic: Ua riro te mau rave'a haaparareraa hu'ahu'a aminosulfonic ei rave'a haaparareraa parau teitei, e nehenehe te faito o te faaitiraa i te pape e naeahia hau atu i te 25%, o te haamaitai rahi i te aravihi no te faaohipa i te raima e te vai maoro. Āre'a, E mea rahi roa te moni no te hamani i te mau hu'ahu'a ati sulfamic. Ia nainai roa aore ra ia rahi roa te poihâ o te mau hu'ahu'a, E mea ohie roa ia faatupu i te taheraa toto, te faataaraa e te faaetaetaraa. I teie nei, te maimiraa i teie huru rave'a no te faaiti i te pape, na roto ïa i te tauiraa i te ati aminosulfonic e te haaparareraa i te mau hu'ahu'a sima, o te nehenehe e faaiti maitai i te mau hape i roto i te faaohiparaa e e faarahi i te matete.
(4) Ua faaapîhia te lignosulfonate: Na roto i te tauiraa i te lignosulfonate, ua hamanihia te hoê ravea apî. Ua riro te lignin sulfonate apî ei rave'a no te faaiti i te pape, te faito o te faaitiraa i te pape 1.5 e rave rahi taime teitei a'e i te faito o te rave'a no te faaiti i te pape, e te veavea o te pape e te faito o te toparaa o te sima, e tauihia ïa no te haapapu i te ohipa maitai roa o te sima, e mea iti roa te hoo no te hamaniraa, e mea tano no te paturaa.
(5) Hybrid no te faaiti i te pape: E anoihia te tao'a no te faaiti i te pape na roto i te faaôraa i roto i te copolymer acrylate, i roto i te reira te vai ra te ati maleic amide e te hu'ahu'a pyrrole, e i te hoê â taime, te tahi atu mau copolymer o te vai ra te ati sulfonic e te ati carboxylic i roto i te hoê tuhaa, no reira, ma te faaohipa i te mau ohipa a to ratou mau anion taa ê e te mau huru ohipa, E nehenehe te mau huru polymer e te mau copolymer atoa e faaohipahia ei mau hu'ahu'a rahi, e tauaparau ai te reira e te mau hu'ahu'a sima. E mea fifi roa ia hamani i te mau ravea apî, e e titauhia e rave rahi tamataraa no te faataa i te rahiraa o te moni.
O Cie-China.org te taata rahi roa a'e o te horo'a i te mau rave'a haaparareraa parau, te mau hu'ahu'a rahi,Te haamaitairaa o te hu'ahu'a no te hu'ahu'a mo'a, Te mau ofa'i CLC. Mai te mea e, te imi ra outou te mau hu'ahu'a rahi, Aita e feaaraa A farerei ia matou.