Addittivi tal-Konkrit Ħfief | Aġenti tar-ragħwa ta 'prestazzjoni għolja għall-konkrit ċellulari
What is foam generator?
Foaming machine, also known as foam generator, is a kind of foam equipment that makes foaming agent reach a certain concentration of aqueous solution. The foaming agent itself cannot automatically become a foam, it must pass the mechanical action of the foaming machine to become foam.
What is the principle of the foam generator?
Irrispettivament mill-ġeneratur tal-fowm, il-prinċipju bażiku tar-ragħwa huwa li tintroduċi arja fis-soluzzjoni tal-aġent tar-ragħwa. Id-diversi tipi ta 'bidliet huma differenti fil-mod ta' introduzzjoni tal-gass, għalhekk l-effett huwa wkoll differenti.
Hemm żewġ fatturi meħtieġa għall-formazzjoni tar-ragħwa, one is foaming agent solution, u l-oħra hija l-arja, both of which are indispensable. Mingħajr is-soluzzjoni tal-aġent ta 'nfiħ, il-film likwidu madwar il-gass ma jifformax u ma jkun hemm l-ebda bżieżaq. U mingħajr gass, soluzzjoni tal-aġent tar-ragħwa waħedha ma tistax tifforma bżieżaq.
Fis-sistema tal-formazzjoni tal-bużżieqa, is-soluzzjoni tal-aġent ta 'nfiħ hija l-mezz ta' dispersjoni, il-gass huwa l-fażi mxerrda, u l-gass huwa mxerred fil-likwidu biex jiffurmaw bżieżaq, u mbagħad bosta bżieżaq jiffurmaw ir-ragħwa. Minbarra l-fattur importanti tal-prestazzjoni tal-aġent ta 'nfiħ, l-introduzzjoni tal-gass fis-soluzzjoni tal-aġent ta 'nfiħ hija fattur importanti ieħor. Il-prinċipju tal-ġeneratur tal-fowm huwa li jintroduċi gass fil-likwidu, jiġifieri, il-ġeneratur tal-fowm juża ċertu metodu biex jintroduċi l-gass fil-likwidu. Magni tar-ragħwa differenti għandhom metodi differenti ta 'introduzzjoni tal-gass. B'mod ġenerali, hemm diversi modi biex tintroduċi l-gass fil-magna tar-ragħwa:
(1) Xfafar li jduru bil-mod jintroduċu gass
Dan huwa metodu ta 'introduzzjoni direttament tal-gass fil-mehrież (jew demel likwidu tal-konkos) imħallat ma 'aġent tar-ragħwa tas-siment. Meta x-xafra tal-mixer timbotta d-demel likwidu, l-arja tidħol fid-demel likwidu bix-xfafar tal-mixer. Barra minn hekk, ammont kbir ta 'arja jitgeżwer fid-demel likwidu meta d-demel likwidu jinqaleb, u parti mill-arja tiddaħħal fid-demel likwidu mis-siment u l-aggregat. Is-somma tat-tlieta hija l-ammont totali ta 'arja li tidħol fid-demel likwidu. Fosthom, l-arja miġjuba fid-demel likwidu mix-xafra li tħawwad u l-arja mgeżwra mix-xafra li ddawwar id-demel likwidu jokkupa l-korp prinċipali.
Wara li l-arja tidħol fid-demel likwidu, il-likwidu li fih is-surfactant tal-aġent tar-ragħwa jdawru l-arja, li jiffurmaw film likwidu b'saff ta 'elettron doppju fl-interface bejn l-arja u l-likwidu, u finalment jifforma l-bżieżaq fid-demel likwidu fil-forma ta 'arja fil-likwidu.
Minħabba l-veloċità ta 'rotazzjoni bil-mod tax-xfafar u inqas gass introdott b'dan il-mod, l-ammont ta 'bżieżaq iġġenerat huwa żgħir, l-effett tar-ragħwa mhux tajjeb, u l-effiċjenza hija baxxa.
(2) Xfafar li jduru b'veloċità għolja jintroduċu gass
Dan huwa mod ta 'introduzzjoni tal-gass fis-soluzzjoni tal-aġent ta' nfiħ billi tiddependi fuq xfafar li jduru b'veloċità għolja. L-introduzzjoni tal-gass tiddependi prinċipalment fuq il-forza tax-xfafar li jduru. Ix-xfafar ta 'dan it-tip ġeneralment jeħtieġu rotazzjoni b'veloċità għolja, the speed should be> 700 rpm, ġeneralment bejn 700 u 1400 rpm, and the peripheral speed of the impeller end should be> 20 m/s sabiex jinkisbu riżultati sodisfaċenti. Ċerta veloċità għolja tista 'tesponi l-impeller għal-likwidu, kuntatt mal-arja, u daħħal l-arja. Jekk il-veloċità hija baxxa wisq, l-impeller mhux se jkun espost għal-likwidu, u l-ammont ta 'arja fsada se jkun baxx ħafna. Il-veloċità xierqa għandha tkun aktar baxxa milli l-impeller ikun espost meta l-likwidu jkun qed idur.
The basic principle of impeller bleed air is as follows:
When the impeller rotates at a high speed, it drives the cement foaming agent solution in the foaming cylinder to rotate, forming a rolling circulation and generating a large vortex. F'dan iż-żmien, the gas-liquid two-phase particles located at the gas-liquid interface at the top of the blowing agent solution will accompany them down and descend to the bottom of the vortex in a rapid spiral shape, forming a turbulent flow zone at 2.5-5 cm of the impeller edge. In this area, the gas-liquid two-phase particles are subjected to the strong shear and impact of the impeller, and are dispersed into fine dispersions, which quickly realizes the gas-liquid mixing, makes the gas uniformly dispersed in the liquid, and realizes the gas Introduce. Its introduction efficiency is related to various technical factors such as the speed, the diameter of the impeller, the distance between the impeller and the foaming tube, and the shape of the impeller blades. It is not determined by a single speed. High-speed impellers have air-entraining effects, but the efficiency, effett, and energy consumption are different.
(3) Use of pressure to introduce gas.
This is currently the most commonly used advanced air-entrained foaming method at home and abroad. Huwa wkoll metodu aktar xjentifiku li jdaħħal l-arja. It is the core of foam concrete high-pressure and medium-pressure foam generator technology.
Iż-żewġ metodi msemmija hawn fuq huma bil-mod u irregolari, u d-dijametru tal-bużżieqa huwa kbir, speċjalment id-dijametru tal-bużżieqa ma jistax jiġi kkontrollat. Huwa kompletament dipendenti fuq ir-randomness tal-magna tar-ragħwa, u ma jistax jiggarantixxi d-dijametru żgħir tal-bużżieqa u fowm uniformi. L-indikaturi tekniċi l-aktar kritiċi. Fl-istess ħin, l-ammont ta 'ragħwa huwa diffiċli biex jiġi kkontrollat.
Sabiex issolvi b'mod effettiv il-problemi ta 'hawn fuq, daħal fis-seħħ il-metodu tar-ragħwa bi pressjoni. Regardless of foaming volume, veloċità tar-ragħwa, or foam diameter and foam uniformity, eċċ., huma telgħu fuq livell ġdid u għamlu progress teknoloġiku kbir. Il-prinċipju ewlieni tiegħu huwa li juża diversi tagħmir li jista 'jiġġenera pressjoni ta' l-arja biex tagħfas l-arja fil-fażi likwida biex tikseb taħlit uniformi taż-żewġ fażijiet. Taħt pressjoni normali, huwa diffiċli li l-arja tidħol fil-likwidu, iżda taħt ċerta pressjoni, isir aktar faċli. Din il-pressjoni tal-arja mhux biss tagħfas il-gass fil-likwidu, iżda wkoll tagħfas il-likwidu fil-gass. Fil-fatt, fl-istess ħin tapplika pressjoni. B'dan il-mod, it-taħlit taż-żewġ fażijiet se jkun mgħaġġel, effiċjenti, uniformi, u jkollhom bżieżaq fini, li jissodisfa r-rekwiżiti tekniċi ideali għar-ragħwa.
There are two main types of pressure equipment used in our country, one is an air compressor and the other is a blower. The air compressor produces high pressure, and the blower produces medium low pressure. Għalhekk, the foaming effect of the air compressor is better, and the foaming effect of the blower is slightly worse. Foaming with an air compressor is called a high-pressure foaming machine, and foaming with a blower is called a medium and low pressure foam generator. The foaming quality of the air compressor mainly controls its pressure and displacement, while the foaming of the blower mainly controls its wind pressure and air volume.
Due to the good foaming effect of air compression mechanism, most foaming machines in our country use air compressors. Blower foaming also has many applications in my country, but compared to high-pressure foaming, this foaming method is still rare. The foam produced by high-pressure air foaming has a low water-sucking rate, the bubble diameter is small, dense and uniform, and the quality is high. The foam produced by blast foaming has a slightly larger diameter, and the overall quality is not as good as high-pressure foaming.
(4) High pressure jet introduces gas
This is a foaming method that has been tried in recent years but has not been widely used. The basic principle is to use the strong dispersion force generated by the jet to achieve instantaneous large surface contact between the gas phase and the liquid phase, so that the two are uniformly mixed, and the liquid is entrapped to form a foam. This method does not show any more advantages than high-pressure air foaming, and it needs further exploration and improvement.
Cie-China.org huwa l-fornitur ewlieni ta 'addittivi tal-konkrit tal-fowm li jipprovdi aġent tar-ragħwa tal-konkrit, superplastiċizzant,li jsaħħaħ is-saħħa tal-konkrit tal-fowm għall-konkrit ħafif, Blokki CLC. Jekk qed tfittex ġeneratur tal-fowm, jekk jogħġbok tħossok liberu li ikkuntattjana.