Kudyidzana kwemakemikari pakati peHPMC uye cementitious zvinhu

Hydroxypropyl methylcellulose (HPMC) inoshandiswa zvakanyanya cellulose ether muzvinhu zvekuvaka nekuda kwezvimiro zvayo zvakasiyana sekuchengetedza mvura, kugona kukora, uye kunamatira. Mune simende masisitimu, HPMC inoshandisa zvinangwa zvakasiyana, zvinosanganisira kusimudzira kushanda, kuvandudza kunamatira, uye kudzora maitiro emvura.

Cementitious zvinhu zvinoita basa rakakosha mukuvaka, zvichipa musana wezvimiro zvezvishandiso zvakasiyana siyana. Mumakore achangopfuura, kwave nekufarira kuri kukura mukugadzirisa masisitimu esimende kuti asangane nezvinodiwa zvekuita, sekusimudzira kushanda, kusimba kwesimba, uye kuderedzwa kwezvakatipoteredza. Hydroxypropyl methylcellulose (HPMC) ndechimwe chezvinonyanya kushandiswa mukuwedzera mune simentitious maumbirwo nekuda kwekusiyana-siyana kwemaitiro uye kuenderana nesamende.

1.Zvinhu zveHydroxypropyl Methylcellulose (HPMC)

HPMC is a cellulose ether inotorwa kubva kune yakasikwa cellulose kuburikidza nekugadzirisa kemikari. Iyo ine akati wandei anodiwa zvivakwa zvekuvaka zvikumbiro, kusanganisira:

Kuchengetwa kwemvura: HPMC inogona kutora uye kuchengetedza yakawanda yemvura, iyo inobatsira kudzivirira kukurumidza kubuda uye kuchengetedza yakakodzera hydration mamiriro mune simenti masisitimu.

Kukora kugona: HPMC inopa viscosity kumasanganiswa esimende, kuvandudza kushanda kwavo uye kuderedza kupatsanurwa uye kubuda ropa.
Adhesion: HPMC inosimudzira kunamira kwesimende zvinhu kune akasiyana substrates, zvichitungamira kune yakagadziridzwa simba rebhondi uye kusimba.
Kugadzikana kwemakemikari: HPMC inoshingirira kuparara kwemakemikari munzvimbo dzealkaline, zvichiita kuti ive yakakodzera kushandiswa mumasisitimu-samende.

2.Chemical Kudyidzana Pakati peHPMC uye Cementitious Materials

Iko kudyidzana pakati peHPMC uye cementitious zvinhu kunoitika pamatanho akati wandei, anosanganisira adsorption yemuviri, kemikari maitiro, uye microstructural shanduko. Kudyidzana uku kunopesvedzera iyo hydration kinetics, microstructure development, mechanical properties, uye kusimba kwezvakaguma cementitious composite.

3.Physical Adsorption

Mamorekuru eHPMC anogona kunyura pamusoro pezvikamu zvesimende kuburikidza nehydrogen bonding uye mauto eVan der Waals. Iyi adsorption process inopesvedzerwa nezvinhu zvakaita senzvimbo uye kubhadharisa kwemasimende masimende, pamwe nehuremu hwemamorekuru uye kusangana kweHPMC mumhinduro. Kushambadza kwemuviri kweHPMC kunobatsira kuvandudza kupararira kwemasimende esimende mumvura, zvichiita kuti kuwedzere kushanda uye kuderedza kudiwa kwemvura mumasanganiswa esimende.

4.Chemical Reactions

HPMC inogona kusangana nemakemikari maitikiro nezvikamu zvesimentitious zvinhu, kunyanya ne calcium ions inoburitswa panguva yekuiswa kwe simenti. Mapoka ehydroxyl (-OH) aripo muHPMC mamorekuru anogona kuita necalcium ions (Ca2+) kuumba calcium complexes, izvo zvinogona kubatsira pakugadzika nekuoma kwemasimiti esimende. Pamusoro pezvo, HPMC inogona kudyidzana nezvimwe simende hydration zvigadzirwa, senge calcium silicate hydrates (CSH), kuburikidza nehydrogen bonding uye ion kuchinjana maitiro, zvichipesvedzera iyo microstructure uye michina zvimiro zveakaomeswa simende paste.

5.Microstructural Modifications

Kuvapo kweHPMC mumasisitimu ecementitious kunogona kuunza microstructural shanduko, kusanganisira shanduko mune pore chimiro, pore saizi kugovera, uye hydration zvigadzirwa morphology. HPMC mamorekuru anoita senge pore fillers uye nucleation nzvimbo dze hydration zvigadzirwa, zvichitungamira kune denser microstructures ane akakwenenzverwa pores uye mamwe mayunifomu ekugovera zvigadzirwa zve hydration. Aya ma microstructural anogadziridzwa anobatsira kuvandudza michina zvinhu, senge compressive simba, flexural simba, uye kusimba, yeHPMC-yakagadziridzwa simende zvinhu.

6.Effects pane Properties uye Performance

Kudyidzana kwemakemikari pakati peHPMC uye simende zvinhu zvine mhedzisiro yakakura pane zvivakwa uye kuita kwezvigadzirwa zvesimende. Izvi zvinosanganisira:

7.Workability Enhancement

HPMC inovandudza kushanda kwemasanganiswa esimende ne

kuderedza kudiwa kwemvura, kusimbisa kubatana, nekudzora kubuda ropa nekuparadzana. Iko kukora uye kuchengetedza mvura zvivakwa zveHPMC zvinobvumira kuyerera kuri nani uye kupomba kwekongiri musanganiswa, kufambisa mabasa ekuvaka uye kuwana inodiwa kupera kwepamusoro.

8.Kudzora kweHydration Kinetics

HPMC inopesvedzera iyo hydration kinetics yemasimiti masisitimu nekugadzirisa kuwanikwa kwemvura uye ion, pamwe neiyo nucleation uye kukura kwe hydration zvigadzirwa. Kuvapo kweHPMC kunogona kudzoreredza kana kumhanyisa hydration maitiro zvichienderana nezvinhu zvakaita serudzi, kutarisisa, uye huremu hwemamolekyulu eHPMC, pamwe nemamiriro ekurapa.

9.Kuvandudzwa kweMechanical Properties

HPMC-yakagadziridzwa cementitious zvinhu zvinoratidza yakakwidziridzwa michina zvivakwa zvichienzaniswa neyakajeka simende-yakavakirwa masisitimu. Iyo microstructural shanduko yakakonzerwa neHPMC inokonzeresa yakakwira yekumanikidza simba, flexural simba, uye kuomarara, pamwe nekuvandudza kuramba kuputsa uye deformation pasi pemutoro.

10.Kuwedzera Kusimba

HPMC inokwidziridza kusimba kwezvinhu zvecementitious nekuvandudza kuramba kwavo kune dzakasiyana nzira dzekusvibisa, kusanganisira kutonhora-kutenderera kutenderera, kurwisa kwemakemikari, uye carbonation. Iyo denser microstructure uye yakaderedzwa permeability yeHPMC-yakagadziridzwa simenti masisitimu inobatsira mukuwedzera kuramba kune ingress yezvinhu zvinodzima uye hupenyu hurefu hwesevhisi.

Hydroxypropyl methylcellulose (HPMC) inoita basa rakakosha mukugadzirisa zvivakwa uye kuita kwesementitious zvinhu kuburikidza nekudyidzana kwemakemikari nezvikamu zvesimende. Iko kushambadza kwemuviri, maitiro emakemikari, uye microstructural shanduko yakakonzerwa neHPMC inopesvedzera kushanda, hydration kinetics, michina zvivakwa, uye kusimba kwezvigadzirwa-simende. Kunzwisisa kupindirana uku kwakakosha pakugadzirisa kugadzirwa kweHPMC-yakagadziridzwa simende zvinhu zvekushandisa zvakasiyana siyana zvekuvaka, kubva kune yakajairika kongiri kusvika kune yakasarudzika madhaka uye grouts. Kumwe kutsvagurudza kunodiwa kuti uongorore maitiro akaomarara ari pasi pekudyidzana pakati peHPMC uye simende zvinhu uye kugadzira epamberi HPMC-based additives ane anoenderana zvivakwa kune chaiwo zvinodiwa zvekuvaka.