Hydroxypropyl methylcellulose ether pa katundu wa ntchentche phulusa matope

Zotsatira za hydroxypropyl methylcellulose ether pa katundu wa matope a ntchentche adaphunzira, ndipo ubale pakati pa kachulukidwe konyowa ndi mphamvu zopondereza unawunikidwa. Zotsatira zoyesa zikuwonetsa kuti kuwonjezera hydroxypropyl methylcellulose ether kuwulutsa matope a phulusa kumatha kupititsa patsogolo ntchito yosungira madzi mumatope, kutalikitsa nthawi yolumikizana ndi matope, ndikuchepetsa kunyowa komanso kukakamiza kwamatope. Pali kulumikizana kwabwino pakati pa kachulukidwe konyowa ndi mphamvu yopondereza ya 28d. Pansi pa kachulukidwe konyowa kodziwika, mphamvu yopondereza ya 28d imatha kuwerengedwa pogwiritsa ntchito njira yoyenera.

Mawu ofunikira:kuuluka phulusa; cellulose ether; kusunga madzi; compressive mphamvu; kulumikizana

Pakalipano, phulusa la ntchentche lakhala likugwiritsidwa ntchito kwambiri pa zomangamanga. Kuwonjezera kuchuluka kwa ntchentche phulusa mu matope sangakhoze kusintha mawotchi katundu ndi durability matope, komanso kuchepetsa mtengo wa matope. Komabe, matope a ntchentche amawonetsa kusakwanira kwa madzi, kotero momwe mungasungire madzi mumatope ndi vuto lomwe liyenera kuthetsedwa. Ma cellulose ether ndi osakanikirana bwino kwambiri omwe amagwiritsidwa ntchito kunyumba ndi kunja. Zimangofunika kuwonjezeredwa pang'ono kuti zikhale ndi zotsatira zabwino pa zizindikiro zogwira ntchito monga kusungirako madzi ndi kukakamiza mphamvu yamatope.

1. Zopangira ndi njira zoyesera

1.1 Zopangira

Simenti ndi P·O 42.5 kalasi wamba Portland simenti opangidwa ndi Hangzhou Meiya Cement Factory; phulusa la ntchentche ndi girediⅡphulusa; mchenga ndi mchenga wamba wamba wokhala ndi fineness modulus ya 2.3, kachulukidwe kake ka 1499kg·m-3, ndi chinyezi cha 0,14%, matope okwana 0,72%; hydroxypropyl methyl cellulose ether (HPMC) amapangidwa ndi Shandong Heda Co., Ltd., mtundu ndi 75HD100000; madzi osakaniza ndi madzi apampopi.

1.2 Kukonzekera kwamatope

Pamene kusakaniza mapadi etere kusinthidwa matope, choyamba kusakaniza HPMC ndi simenti ndi kuwuluka phulusa bwinobwino, ndiye youma kusakaniza mchenga kwa masekondi 30, ndiye kuwonjezera madzi ndi kusakaniza osachepera 180 masekondi.

1.3 Njira yoyesera

Kachulukidwe, kachulukidwe konyowa, kusungunuka ndi nthawi yoyika matope osakanizidwa adzayezedwa motsatira malamulo oyenerera mu JGJ70-90 "Njira Zoyeserera Zoyambira Zopangira Dongo". Kusungidwa kwamadzi kwamatope kumatsimikiziridwa molingana ndi njira yoyesera yosungiramo madzi mumatope mu Zowonjezera A za JG/T 230-2007 "Ready Mixed Mortar". Kuyesa kwamphamvu kwamphamvu kumatengera 70.7mm x 70.7mm x 70.7mm cube bottomed test mold. Chida choyesera chopangidwa chimachiritsidwa pa kutentha kwa (20±2)°C kwa maola 24, ndipo pambuyo pobowola, imapitilira kuchiritsidwa m'malo otentha (20).±2)°C ndi chinyezi chachibale pamwamba pa 90% mpaka zaka zokonzedweratu, malinga ndi JGJ70-90 "Kumanga Mortar Basic performance test njira" kutsimikiza kwa mphamvu yake yopondereza.

2. Zotsatira zoyesa ndi kusanthula

2.1 Kuchulukana kwamadzi

Zitha kuwoneka kuchokera ku ubale pakati pa kachulukidwe ndi kuchuluka kwa HPMC kuti kachulukidwe konyowa kumachepa pang'onopang'ono ndi kuwonjezeka kwa kuchuluka kwa HPMC. Pamene kuchuluka kwa HPMC ndi 0.05%, kunyowa kwa matope ndi 96.8% ya matope a benchmark. Pamene kuchuluka kwa HPMC kukupitirirabe, Kuthamanga kwa kuchepa kwa madzi kumawonjezeka. Pamene zomwe zili mu HPMC ndi 0.20%, kunyowa kwamatope ndi 81.5% yokha ya matope a benchmark. Izi makamaka chifukwa mpweya-entraining zotsatira za HPMC. Miyendo ya mpweya yomwe imayambitsidwa imawonjezera porosity ya matope ndikuchepetsa kuphatikizika, zomwe zimapangitsa kuchepa kwa kuchuluka kwa matope.

2.2 Kukhazikitsa nthawi

Zitha kuwoneka kuchokera ku ubale pakati pa nthawi ya coagulation ndi kuchuluka kwa HPMC kuti nthawi ya coagulation ikuwonjezeka pang'onopang'ono. Pamene mlingo ndi 0.20%, nthawi yoikika imawonjezeka ndi 29.8% poyerekeza ndi matope, kufika pafupifupi 300min. Zitha kuwoneka kuti pamene mlingo uli 0.20%, nthawi yoikika imakhala ndi kusintha kwakukulu. Chifukwa chake ndi chakuti L Schmitz et al. amakhulupirira kuti mamolekyu a cellulose ether amatengeka kwambiri pazinthu za hydration monga cSH ndi calcium hydroxide, ndipo samakonda kudsorbed pa gawo loyambirira la mchere la clinker. Kuphatikiza apo, chifukwa cha kuchuluka kwa kukhuthala kwa pore yankho, cellulose ether imachepa. Kuyenda kwa ayoni (Ca2+, so42-…) mu pore yankho kumachedwetsanso hydration.

2.3 Kuyika ndi kusunga madzi

Kuchuluka kwa delamination ndi kusungidwa kwa madzi kumatha kuwonetsa momwe matope amasungira madzi. Kuchokera paubwenzi pakati pa kuchuluka kwa delamination ndi kuchuluka kwa HPMC, zitha kuwoneka kuti kuchuluka kwa delamination kukuwonetsa kuchepa kwa kuchuluka kwa HPMC. Pamene zili HPMC ndi 0.05%, mlingo wa delamination amachepetsa kwambiri, kusonyeza kuti pamene zili CHIKWANGWANI ether ndi yaing'ono, mlingo wa delamination akhoza kuchepetsedwa kwambiri, zotsatira za kusunga madzi akhoza bwino, ndi workability ndi. Kugwira ntchito kwa matope kumatha kuwongolera. Tikayang'ana pa ubale pakati pa katundu wa madzi ndi kuchuluka kwa HPMC, pamene kuchuluka kwa HPMC kumawonjezeka, kusungirako madzi kumakhalanso bwino. Mlingo ukakhala wosakwana 0.15%, mphamvu yosungira madzi imakula pang'onopang'ono, koma mlingo ukafika pa 0.20%, mphamvu yosungira madzi yasintha kwambiri, kuchokera ku 90.1% pamene mlingo ndi 0.15%, mpaka 95%. Kuchuluka kwa HPMC kukupitilirabe, ndipo ntchito yomanga matope imayamba kuwonongeka. Choncho, poganizira ntchito yosungira madzi ndi ntchito yomanga, kuchuluka koyenera kwa HPMC ndi 0.10% ~ 0.20%. Kuwunika kwa njira yosungira madzi: Cellulose ether ndi polima yosungunuka m'madzi, yomwe imagawidwa kukhala ionic ndi non-ionic. HPMC ndi non-ionic cellulose etha ndi gulu hydrophilic, gulu hydroxyl (-OH) ndi etere chomangira (-0-1) mu chilinganizo chake structural. Akasungunuka m'madzi, maatomu a okosijeni pa gulu la hydroxyl ndi mgwirizano wa ether ndi madzi Mamolekyulu amagwirizanitsa kupanga zomangira za haidrojeni, zomwe zimapangitsa madzi kutaya madzi ake, ndipo madzi aulere salinso omasuka, motero amakwaniritsa zotsatira za kusunga madzi ndi kukhuthala.

2.4 Mphamvu zopondereza

Kuchokera paubwenzi pakati pa mphamvu zopondereza ndi kuchuluka kwa HPMC, zikhoza kuwoneka kuti ndi kuwonjezeka kwa kuchuluka kwa HPMC, mphamvu yopondereza ya 7d ndi 28d inasonyeza kuchepa kwa chiwerengero, chomwe chinali makamaka chifukwa cha kukhazikitsidwa kwa chiwerengero chachikulu. wa thovu mpweya ndi HPMC, amene kwambiri porosity matope. kuwonjezeka, zomwe zimapangitsa kuchepa kwa mphamvu. Pamene zomwe zili ndi 0.05%, mphamvu ya 7d imatsika kwambiri, mphamvu imatsika ndi 21.0%, ndipo mphamvu ya 28d imatsika ndi 26.6%. Zitha kuwoneka kuchokera pamapindikira kuti zotsatira za HPMC pa mphamvu yopondereza ndizodziwikiratu. Pamene mlingo uli wochepa kwambiri, udzachepetsedwa kwambiri. Chifukwa chake, muzogwiritsira ntchito, mlingo wake uyenera kuwongoleredwa ndikugwiritsidwa ntchito limodzi ndi defoamer. Kufufuza chifukwa chake, Guan Xuemao et al. kukhulupirira kuti choyamba, pamene mapadi efa anawonjezera matope, ndi polima kusintha mu pores matope ndi kuchuluka, ndipo ma polima osinthasintha ndi pores sangathe kupereka chithandizo okhwima pamene chipika mayeso ndi wothinikizidwa. Matrix ophatikizika amakhala ochepa mphamvu, motero amachepetsa mphamvu yopondereza ya matope; chachiwiri, chifukwa cha madzi posungira zotsatira za mapadi efa, pambuyo matope mayeso chipika aumbike, madzi ambiri amakhala mu matope, ndi kwenikweni madzi simenti chiŵerengero ndi m'munsi kuposa popanda Amenewo ndi zazikulu kwambiri, kotero compressive mphamvu. matope adzachepetsedwa kwambiri.

2.5 Kulumikizana pakati pa mphamvu yopondereza ndi kachulukidwe konyowa

Zitha kuwoneka kuchokera pamapindikira a ubale pakati pa mphamvu zopondereza ndi kachulukidwe konyowa kuti pambuyo polumikiza mfundo zonse pachithunzichi, mfundo zofananirazo zimagawidwa bwino mbali zonse za mzere woyenerera, ndipo pali kulumikizana kwabwino pakati pa kachulukidwe konyowa ndi kuponderezana. mphamvu, ndipo kachulukidwe konyowa ndi kosavuta komanso kosavuta kuyeza, kotero mphamvu yopondereza ya matope 28d imatha kuwerengedwa kudzera mu mzere wokhazikika wokhazikika. Mzere woyenerera wa equation ukuwonetsedwa mu formula (1), R²= 0.9704. Y=0.0195X-27.3 (1), kumene, y ndi 28d mphamvu yopondereza ya matope, MPa; X ndi kachulukidwe konyowa, kg m-3.

3. Mapeto

HPMC imatha kusintha momwe madzi amasungiramo matope a ntchentche ndikutalikitsa nthawi yogwiritsira ntchito matope. Panthawi imodzimodziyo, chifukwa cha kuwonjezeka kwa porosity ya matope, kuchuluka kwake kwakukulu ndi mphamvu zopondereza zidzatsika kwambiri, choncho mlingo woyenera uyenera kusankhidwa pogwiritsira ntchito. Mphamvu yopondereza ya matope ya 28d imakhala ndi kulumikizana kwabwino ndi kachulukidwe konyowa, ndipo mphamvu yopondereza ya 28d imatha kuwerengedwa poyesa kuchuluka kwamadzi, komwe kuli ndi tanthauzo lofunikira pakuwongolera matope pakumanga.