Ngaahi me'a tanaki sima ma'ama'a | Ngaahi fakafofonga Foaming ma'olunga-ngaue ki he sima 'o e selo
Ko e polycarboxylate vai-fakasi'isi'i 'a e fakafofonga ko ha copolymer fakapipiki 'oku 'i ai ha fokotu'utu'u 'o e molekula hange ko e selu ., ko e seini tefito ko ha seini kaponi alkyl 'oku 'i ai ha kulupu ngaue carboxyl ., pea ko e seini tafaʻaki ko ha polyoxyethylene . (mo e/pe poliokisipolopilini) 'iuniti fakafa'unga 'oku 'i ai ha loloa kehekehe.
'Oku adsorbed 'a e kulupu carboxyl 'i he seini lahi 'o e polycarboxylate superplasticizer 'e he tohoaki'i 'o e 'uhila mo e ngaahi momo'i me'a sima .,Polyoxyethylene 'iuniti 'o e loloa kehekehe 'i he seini tafa'aki 'oku ne ta'ofi 'a e ngaahi momo'i me'a kehe 'o e sima mei he fakaofiofi 'e he fakafe'atungia'i steric mo a'usia 'enau movetevete 'o e sima.Fakafehoanaki mo e naphthalene-fakava'e 'i he vai reducers ., polycarboxylate superplasticizers have a stronger dispersing ability for cement and exhibit a higher concrete water reduction rate.Its water reduction rate is over 40%, which can significantly reduce the amount of concrete mixing water.
The water consumption of concrete can determine the water-to-binder ratio ('inasi 'o e vai-sima), and the water-to-binder ratio ('inasi 'o e vai-sima) directly affects the mechanical properties of concrete.The water-cement ratio rule considers that the 28d compressive strength of concrete is directly proportional to the reciprocal of the water-cement ratio.In order to ensure the compressive strength of concrete, production technicians usually use a smaller water-to-binder ratio.
In order to improve the economics of concrete, reducing the water consumption of concrete is the most effective way to reduce the water-to-gel ratio of concrete.
The reduction of concrete mixing water will affect the workability of the fresh concrete, and the polycarboxylate water reducing agent can effectively ensure the workability of the concrete mixture.Furthermore, the organic unity of the polycarboxylic acid water reducing agent and the concrete water consumption is realized.
The change in the water consumption of concrete not only determines the concrete water-to-binder ratio, but also affects the concrete-to-slurry ratio of the concrete.As with the water-binder ratio, the slurry-to-bone ratio is also an important factor that must be considered in the design of the concrete mix ratio.The ratio of the slurry to the concrete mixture is the ratio of the total amount of the mixing water and the cementitious material to the total volume of the aggregate. The change of the ratio of the slurry to the concrete affects the workability and volume stability of the concrete.Compared with the density of the cementitious material (sima: fekauʻaki 3.0 g/sm3.; efuefu lele: 1.9 ki 2.4 g/sm3.; efuefu minerale: fekauʻaki 2.6 g/sm3.), ko e matolu 'o e vai . (1.0 g/sm3.) ‘oku si‘isi‘i ange ia ‘iate kinautolu .,
'I he tu'unga 'o e fu'u kakai tatau ., the change in water consumption has the greatest effect on the total volume of the slurry.Under the condition that the total amount of the rubber material is kept constant, ko e fakasi'isi'i 'o e fakamole 'o e vai 'e pau ke iku ia ki ha holo hifo 'i he lahi 'o e slurry 'o e fefiofi ., 'a ia 'oku ne uesia 'a e workability 'o e sima fo'ou.Ko ia ai ., 'i he taimi 'oku fakasi'isi'i ai 'a e vai-ki he-binder 'aki hono fakasi'isi'i 'a e fakamole 'o e vai 'o e sima ., 'oku totonu ke fakatonutonu 'a e lahi fakakatoa 'o e kapa ke fakapapau'i 'oku tu'uma'u 'a e 'inasi 'o e slurry ki he sima.Ka neongo ia ., 'oku fa'a li'aki 'e he kau ngaue 'o e ngaohi'anga sima 'a e ola 'o e fakamole 'o e vai 'i he 'inasi 'o e slurry ki he hui ., 'a ia 'oku ne fakatupu 'a e lahi 'o e slurry ke kehekehe lahi mo e liliu 'o e fakamole 'o e vai ..
Koe'uhi ke fakapapau'i 'a e workability 'o e sima ., kuo fokotu'u 'e he kau ngaue 'o e ngaohi'anga sima 'a e ngaahi fie ma'u fakatekinikale ma'olunga ange ki he polycarboxylate vai reducer.The polycarboxylate vai fakasi'isi'i 'a e fakafofonga 'oku 'ikai ngata pe 'i he ma'u 'e he sima malohi 'a e malava ke fakamovetevete ., but also needs to have a good plasticizing ability for the concrete mixture, koe'uhi ke 'i ai ha fakafalala malohi 'a e workability 'o e sima ki he fakahoko 'o e polycarboxylate vai fakasi'isi'i 'a e fakafofonga ..
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