Umthelela we-cellulose ether ekuncipheni kwamahhala kwepulasitiki kodaka

Umthelela we-cellulose ether ekuncipheni kwamahhala kwepulasitiki kodaka

Inzwa yokususwa kwe-laser engathinteki yasetshenziswa ukuze kuhlolwe ngokuqhubekayo ukuncipha kwamahhala kwepulasitiki kwe-HPMC modified usimende mortar ngaphansi kwezimo ezisheshiswayo, futhi izinga layo lokulahlekelwa kwamanzi labonwa ngesikhathi esifanayo. Okuqukethwe kwe-HPMC kanye namamodeli epulasitiki wokuncipha wamahhala kanye nezinga lokulahleka kwamanzi kwasungulwa ngokulandelana. Imiphumela ikhombisa ukuthi ukushwabana kwamahhala kwepulasitiki kosimende kwehla ngokulinganayo ngokwanda kokuqukethwe kwe-HPMC, futhi ukushwabana kwamahhala kwepulasitiki kodaka lukasimende kungancishiswa ngo-30% -50% ngokungezwa kwe-0.1% -0.4% (ingxenyana yobuningi) I-HPMC. Ngokukhula kokuqukethwe kwe-HPMC, izinga lokulahlekelwa kwamanzi odaka lukasimende nalo liyehla ngendlela efanayo. Izinga lokulahleka kwamanzi odaka lukasimende lingancishiswa ngo-9% ~ 29% ngokwengezwe ngo-0.1% ~ 0.4% HPMC. Okuqukethwe kwe-HPMC kunobudlelwano obusobala bomugqa nokuncipha kwamahhala nezinga lokulahlekelwa kwamanzi odaka. I-HPMC inciphisa ukushwabana kwepulasitiki kosimende ngenxa yokugcinwa kwayo kahle kwamanzi.

Amagama angukhiye:i-methyl hydroxypropyl cellulose ether (HPMC); Udaka; Ukuncipha kwamahhala kwepulasitiki; Izinga lokulahlekelwa kwamanzi; Imodeli yokwehla

Uma kuqhathaniswa nosimende usimende, udaka lukasimende luqhekeka kalula. Ngaphezu kwezinto ezisetshenziswayo ngokwazo, ukushintsha kwezinga lokushisa kwangaphandle kanye nomswakama kuzokwenza usimende ulahlekelwe amanzi ngokushesha, okuholela ekuqhekekeni okusheshayo. Ukuxazulula inkinga yokuqhekeka kodaka lukasimende, kuvame ukuxazululwa ngokuqinisa ukuphulukiswa kwangaphambi kwesikhathi, kusetshenziswa i-ejenti yokwandisa nokwengeza i-fiber.

Njengengxube ye-polymer evame ukusetshenziswa odakeni lukasimende lwezentengiselwano, i-cellulose ether iwukuphuma ku-cellulose okutholwe ukusabela kwe-cellulose yezitshalo ne-caustic soda. UZhan Zhenfeng et al. ibonise ukuthi lapho okuqukethwe kwe-cellulose ether (ingxenyana yobuningi) ingu-0% ~ 0.4%, izinga lokugcinwa kwamanzi odaka lukasimende lalinobudlelwano obuhle bomugqa nokuqukethwe kwe-cellulose ether, futhi lapho okuqukethwe okuphezulu kwe-cellulose ether, kuyanda izinga lokugcinwa kwamanzi. I-Methyl hydroxypropyl cellulose ether (HPMC) isetshenziswa odakeni lukasimende ukuze kuthuthukiswe ukuhlangana nokuhlangana kwayo ngenxa yokuhlangana kwayo, ukuqina kokumiswa kanye nezindawo zokugcina amanzi.

Leli phepha lithatha ipulasitiki yamahhala yokushwabana kukasimende njengento yokuhlola, ihlola umphumela we-HPMC ekuncipheni kwamahhala kwepulasitiki kodaka lukasimende, futhi lihlaziya isizathu sokuthi kungani i-HPMC yehlisa ukushwabana kwamahhala kwepulasitiki kodaka lukasimende.

1. Izinto ezisetshenziswayo kanye nezindlela zokuhlola

1.1 Izinto ezingavuthiwe

Usimende owasetshenziswa ekuhlolweni kwakungusimende we-conch brand 42.5R ojwayelekile wasePortland okhiqizwe yi-Anhui Conch Cement Co., LTD. Indawo yayo ethile yayingama-398.1 m² / kg, insalela yesisefo engu-80μm yayingu-0.2% (ingxenye enkulu); I-HPMC ihlinzekwa yi-Shanghai Shangnan Trading Co., LTD. I-viscosity yayo ingu-40 000 mPa·s, isihlabathi siyisihlabathi esimahhadla esiphuzi esimaphakathi, i-fineness modulus ngu-2.59, kanti ubukhulu bezinhlayiyana ubukhulu bungu-5mm.

1.2 Izindlela zokuhlola

1.2.1 Indlela yokuhlola ukushwabana kwamahhala kwepulasitiki

Ukushwabana kwamahhala kwepulasitiki kodaka lukasimende kwahlolwa idivayisi yokuhlola echazwe ezincwadini. Isilinganiso sikasimende nesihlabathi se-benchmark mortar singu-1: 2 (isilinganiso sobuningi), futhi isilinganiso samanzi kusimende singu-0.5 (isilinganiso sobuningi). Kala izinto zokusetshenziswa ngokwesilinganiso se-mix, futhi ngesikhathi esifanayo wengeze ebhodweni lokuxuba elomile eligovuzayo i-1min, bese ufaka amanzi bese uqhubeka ugqugquzela i-2min. Engeza cishe u-20g we-settler (ushukela omhlophe ohlutshiwe), uhlanganise kahle, uthele udaka lukasimende ngaphandle kusukela phakathi nendawo yesikhunta sokhuni ngendlela evunguzayo, ukwenze ukumboza isikhunta esiphansi sokhuni, ubushelelezi nge-spatula, bese usebenzisa okulahlwayo. ifilimu yepulasitiki ukuyisakaza phezu kodaka lukasimende, bese uthela udaka lokuhlola phezu kwendwangu yetafula lepulasitiki ngendlela efanayo ukuze ugcwalise isikhunta sezinkuni esiphezulu. Futhi ngokushesha ngobude bepuleti le-aluminium elimanzi ubude kunobubanzi besikhunta sokhuni, korobha ngokushesha ohlangothini olude lwesikhunta sokhuni.

Inzwa yokususwa kwe-laser ye-Microtrak II LTC-025-04 yasetshenziswa ukukala ukushwabana kwamahhala kwepulasitiki kwe-slab sikasimende. Izinyathelo zimi kanje: Okuhlosiwe okubili kokuhlola (amapuleti amancane egwebu) abekwe endaweni emaphakathi yepuleti lodaka lukasimende elithululiwe, futhi ibanga phakathi kwalokhu okuhlosiwe okubili kwakungu-300mm. Bese, ifreyimu yensimbi elungiswe ngenzwa yokususwa kwe-laser yabekwa ngaphezu kwesifanekiso, futhi ukufundwa kokuqala phakathi kwelaser nento elinganisiwe kwalungiswa ukuze kube phakathi kwebanga lesikali esingu-0. Ekugcineni, ilambu le-tungsten le-iodine elingu-1000W cishe elingu-1.0m ngaphezu kwesikhunta sokhuni kanye nesiphephetha-moya sikagesi esicishe sibe ngu-0.75m ngaphezu kwesikhunta sokhuni (isivinini somoya singu-5m/s) kwavulwa ngesikhathi esifanayo. Ukuhlolwa kokuncipha kwamahhala kwepulasitiki kwaqhubeka kwaze kwaba yilapho isifanekiso sincipha ukuze sizinze. Ngesikhathi sokuhlolwa konke, izinga lokushisa lalingu (20±3)℃ kanti umswakama ohlobene wawungu (60±5)%.

1.2.2 Indlela yokuhlola izinga lokuhwamuka kwamanzi

Uma kucatshangelwa umthelela wokwakheka kwezinto ezisekelwe kusimende ngezinga lokuhwamuka kwamanzi, izincwadi zisebenzisa izibonelo ezincane ukuze zilingise izinga lokuhwamuka kwamanzi ezibonelo ezinkulu, kanye nobudlelwano phakathi kwesilinganiso esingu-Y sezinga lokuhwamuka kwamanzi lodaka lukasimende lwepuleti elikhulu. kanye nodaka lukasimende lwepuleti elincane futhi isikhathi t(h) simi kanje: y= 0.0002 t+0.736

2. Imiphumela kanye nengxoxo

2.1 Umthelela wokuqukethwe kwe-HPMC ekuncipheni kwamahhala kwepulasitiki kodaka lukasimende

Kusukela kumphumela wokuqukethwe kwe-HPMC ekushwabaneni kwamahhala kwepulasitiki kosimende, kungabonakala ukuthi ukushwabana kwamahhala kwepulasitiki kodaka olujwayelekile lukasimende kwenzeka ikakhulukazi phakathi namahora angu-4 wokuqhekeka okusheshisa, futhi ukushwabana kwawo kwamahhala kwepulasitiki kukhuphuka ngokuhambisana nokwelulwa kwesikhathi. Ngemva kwamahora angu-4, ukushwabana kwamahhala kwepulasitiki kufinyelela ku-3.48mm, futhi ijika liyazinza. Amajika epulasitiki angenawo ama-shrinkage kasimende we-HPMC wonke atholakala ngaphansi kwamajika epulasitiki angenawo anciphayo odaka olujwayelekile lukasimende, okubonisa ukuthi amajika epulasitiki angenawo ama-shrinkage kasimende we-HPMC mancane kunodaka olujwayelekile lukasimende. Ngokukhula kokuqukethwe kwe-HPMC, ukushwabana kwamahhala kwepulasitiki kodaka lukasimende kuncipha kancane kancane. Uma kuqhathaniswa nodaka olujwayelekile lukasimende, ukushwabana kwamahhala kwepulasitiki kukasimende we-HPMC okuxutshwe no-0.1% ~ 0.2% (ingxenyana yobuningi) kuncipha cishe ngo-30%, cishe ngo-2.45mm, kanti ukushwabana kwepulasitiki okungama-0.3% kasimende we-HPMC kwehla cishe ngo-40 %. Icishe ibe ngu-2.10mm, futhi ukushwabana kwamahhala kwepulasitiki okungu-0.4% kukasimende we-HPMC kuncipha cishe ngo-50%, okungaba ngu-1.82mm. Ngakho-ke, ngesikhathi esifanayo esisheshisa ukuqhekeka, ukushwabana kwamahhala kwepulasitiki kodaka lukasimende lwe-HPMC kuphansi kunodaka olujwayelekile lukasimende, okubonisa ukuthi ukufakwa kwe-HPMC kunganciphisa ukushwabana kwamahhala kwepulasitiki kosimende.

Kusukela kumphumela wokuqukethwe kwe-HPMC ekushwabaneni kwamahhala kwepulasitiki kodaka lukasimende, kungabonakala ukuthi ngokwanda kokuqukethwe kwe-HPMC, ukushwabana kwamahhala kwepulasitiki kodaka lukasimende kuncipha kancane kancane. Ubudlelwano phakathi kokushwabana kwamahhala kwepulasitiki (s) kosimende nokuqukethwe kwe-HPMC (w) bungafakwa ngale fomula elandelayo: S= 2.77-2.66 w

Okuqukethwe kwe-HPMC nosimende nosimende ipulasitiki yamahhala yokuncipha kokuhlehla komugqa imiphumela yokuhlaziywa kokuhluka, lapho: F kuyizibalo; Sig. Imele izinga langempela lokubaluleka.

Imiphumela ibonisa ukuthi i-coefficient yokuhlobanisa yalesi sibalo ingu-0.93.

2.2 Umthelela wokuqukethwe kwe-HPMC ngezinga lokulahleka kwamanzi odaka lukasimende

Ngaphansi kwesimo sokusheshisa, kungabonakala ekushintsheni kwezinga lokulahlekelwa kwamanzi odaka lukasimende nokuqukethwe kwe-HPMC, izinga lokulahlekelwa kwamanzi endaweni yodaka lukasimende liyehla kancane kancane ngokwanda kokuqukethwe kwe-HPMC, futhi ngokuyisisekelo liveza ukwehla komugqa. Uma kuqhathaniswa nezinga lokulahlekelwa kwamanzi odaka olujwayelekile lukasimende, lapho okuqukethwe kwe-HPMC kungu-0.1%, 0.2%, 0.3%, 0.4%, ngokulandelana, Izinga lokulahlekelwa kwamanzi odaka olukhulu lukasimende lwehle ngo-9.0%, 12.7%, 22.3% kanye 29.4%, ngokulandelana. Ukufakwa kwe-HPMC kunciphisa izinga lokulahlekelwa kwamanzi odaka lukasimende futhi kwenza amanzi amaningi abambe iqhaza ekufakweni kodaka lukasimende, ngaleyo ndlela kwakhe amandla okuqina okwanele ukuze amelane nengozi yokuqhekeka elethwa imvelo yangaphandle.

Ubudlelwano phakathi kwezinga lokulahlekelwa kwamanzi odaka lukasimende (d) nokuqukethwe kwe-HPMC (w) bungafakwa ngale fomula elandelayo: d= 0.17-0.1w

Imiphumela yomugqa yokuhlaziywa kokuhluka kokuhlehla kokuqukethwe kwe-HPMC nezinga lokulahlekelwa kwamanzi odaka lukasimende libonisa ukuthi i-coefficient yokuhlobanisa yalesi sibalo ingu-0.91, futhi ukuhlobana kusobala.

3. Isiphetho

Ukushwabana kwamahhala kwepulasitiki kodaka lukasimende kuncipha kancane kancane ngokwanda kokuqukethwe kwe-HPMC. Ukushwabana kwamahhala kwepulasitiki kodaka lukasimende ngo-0.1% ~ 0.4% HPMC kwehla ngo-30% ~ 50%. Izinga lokulahlekelwa kwamanzi odaka lukasimende liyehla ngokunyuka kokuqukethwe kwe-HPMC. Izinga lokulahlekelwa kwamanzi odaka lukasimende ngo-0.1% ~ 0.4% HPMC lehla ngo-9.0% ~ 29.4%. Ukushwabana kwamahhala kwepulasitiki kanye nezinga lokulahlekelwa kwamanzi kodaka lukasimende kuhambisana nokuqukethwe kwe-HPMC.