Tasirin ether cellulose akan raguwar turmi kyauta na filastik

Tasirin ether cellulose akan raguwar turmi kyauta na filastik

An yi amfani da firikwensin motsi na Laser mara lamba don ci gaba da gwada ƙarancin filastik kyauta na HPMC gyare-gyaren turmi a ƙarƙashin ingantattun yanayi, kuma an lura da asarar ruwa a lokaci guda. Abubuwan da ke cikin HPMC da raguwar filastik kyauta da samfuran koma bayan asarar ruwa an kafa su bi da bi. Sakamakon ya nuna cewa raguwar filastik kyauta na turmi siminti yana raguwa a layi tare da karuwar abun ciki na HPMC, kuma ana iya rage raguwar filastik kyauta na turmi siminti da kashi 30% -50% tare da ƙari na 0.1% -0.4% (jari mai yawa) HPMC. Tare da karuwar abun ciki na HPMC, yawan asarar ruwa na turmi siminti shima yana raguwa a layi. Za a iya rage yawan asarar ruwa na turmi siminti da 9% ~ 29% tare da ƙarin 0.1% ~ 0.4% HPMC. Abubuwan da ke cikin HPMC suna da alaƙar layi ta zahiri tare da raguwa kyauta da adadin turmi na asarar ruwa. HPMC yana rage raguwar robobin romin siminti saboda kyakkyawan riƙon ruwa.

Mabuɗin kalmomi:methyl hydroxypropyl cellulose ether (HPMC); Turmi; Filastik kyauta raguwa; Yawan asarar ruwa; Regression model

Idan aka kwatanta da kankamin siminti, turmi siminti yana fashe cikin sauƙi. Bugu da ƙari, abubuwan da ke cikin kayan da kansu, canjin yanayin zafi da zafi na waje zai sa turmin siminti ya yi asarar ruwa mai sauri, yana haifar da hanzarin fashewa. Don magance matsalar fashewar turmi na siminti, yawanci ana warware shi ta hanyar ƙarfafa warkarwa da wuri, ta yin amfani da wakili mai faɗaɗawa da ƙara fiber.

A matsayin admixture na polymer da aka saba amfani da shi a turmi siminti na kasuwanci, ether cellulose shine asalin cellulose wanda aka samu ta hanyar amsawar cellulose na shuka da soda caustic. Zhan Zhenfeng et al. ya nuna cewa lokacin da abun ciki na ether cellulose (jam'i mai yawa) ya kasance 0% ~ 0.4%, yawan ajiyar ruwa na turmi siminti yana da dangantaka mai kyau na layi tare da abun ciki na ether cellulose, kuma mafi girman abun ciki na ether cellulose, mafi girma yawan riƙe ruwa. Ana amfani da Methyl hydroxypropyl cellulose ether (HPMC) a cikin turmi siminti don inganta haɗin kai da haɗin kai saboda haɗin kai, kwanciyar hankali na dakatarwa da kuma abubuwan riƙe ruwa.

Wannan takarda tana ɗaukar raƙuman romin siminti kyauta na filastik a matsayin abin gwaji, nazarin tasirin HPMC akan raguwar robobin siminti kyauta, kuma yayi nazarin dalilin da yasa HPMC ke rage raguwar robobin siminti kyauta.

1. Kayan albarkatun kasa da hanyoyin gwaji

1.1 Raw Materials

Simintin da aka yi amfani da shi a gwajin shi ne simintin 42.5R na yau da kullun na Portland wanda Anhui Conch Cement Co., LTD ya samar. Takamammen yankinsa shine 398.1 m²/kg, ragowar 80μm sieve shine 0.2% (jari mai yawa); Ana samar da HPMC ta Shanghai Shangnan Trading Co., LTD. Dankowar sa shine 40 000 mPa·s, yashi matsakaiciya m rawaya yashi, ingancin ingancin shine 2.59, kuma matsakaicin girman barbashi shine 5mm.

1.2 Hanyoyin gwaji

1.2.1 Hanyar gwajin raguwar filastik kyauta

An gwada ƙarancin filastik kyauta na turmi siminti ta na'urar gwaji da aka kwatanta a cikin wallafe-wallafe. Matsakaicin siminti zuwa yashi na turmi mai tushe shine 1:2 (rabo mai yawa), kuma rabon ruwa zuwa siminti shine 0.5 (rabo taro). A auna kayan da aka samu daidai gwargwado, sannan a zuba a cikin tukunyar busassun busasshen motsawa na minti 1, sannan a zuba ruwa a ci gaba da motsawa na 2min. Ƙara kimanin g 20 na mai zama (farin granulated sugar), haɗuwa da kyau, zuba turmin siminti a waje daga tsakiyar itacen a cikin siffar karkace, sanya shi ya rufe ƙananan katako na itace, santsi da shi tare da spatula, sa'an nan kuma amfani da abin zubarwa. Fim ɗin filastik a shimfiɗa shi a saman turmin siminti, sa'an nan kuma a zuba turmin gwajin a kan tebur ɗin filastik kamar yadda ake cike da katako na sama. Kuma nan da nan tare da tsawon farantin aluminum na rigar ya fi tsayi fiye da nisa na katako na katako, da sauri a goge tare da dogon gefen katako.

Microtrak II LTC-025-04 Laser firikwensin kaura da aka yi amfani da shi don auna filastik free shrinkage na siminti turmi slab. Matakan sune kamar haka: An sanya makasudin gwaji guda biyu (kananan faranti kumfa) a tsakiyar matsayi na farantin simintin da aka zuba, kuma tazarar da ke tsakanin maƙasudin gwajin ya kai 300mm. Sa'an nan, an sanya firam ɗin ƙarfe da aka gyara tare da firikwensin motsi na Laser sama da samfurin, kuma an daidaita karatun farko tsakanin Laser da abin da aka auna don kasancewa cikin kewayon 0. A ƙarshe, an kunna fitilar tungsten na iodine mai nauyin 1000W a kusan 1.0m sama da itacen itace da kuma wutar lantarki a kusan 0.75m sama da katakon itace (gudun iska shine 5m / s) a lokaci guda. Gwajin raguwar filastik kyauta ya ci gaba har sai samfurin ya ruguje ya tsaya tsayin daka. A lokacin duk gwajin, zazzabi ya kasance (20± 3) ℃ kuma dangi zafi shine (60± 5)%.

1.2.2 Hanyar gwaji na ƙimar ƙawancen ruwa

Idan aka yi la'akari da tasirin abubuwan da ke tattare da siminti a kan yawan ƙawancen ruwa, wallafe-wallafen suna amfani da ƙananan samfurori don daidaita yawan yawan ƙawancen ruwa na manyan samfurori, da kuma dangantakar da ke tsakanin rabo Y na yawan ƙawancen ruwa na babban faranti siminti turmi. da turmi siminti na ƙaramin faranti da lokacin t(h) shine kamar haka: y= 0.0002 t+0.736

2. Sakamako da tattaunawa

2.1 Tasirin abun ciki na HPMC akan raguwar filastik kyauta na turmi siminti

Daga tasirin abin da ke cikin HPMC akan raguwar filastik kyauta na turmi siminti, ana iya ganin cewa raguwar filastik kyauta na turmi siminti na yau da kullun yana faruwa ne a cikin sa'o'i 4 na saurin fashewa, kuma raguwar filastik kyauta yana ƙaruwa daidai da tsawaita lokaci. Bayan sa'o'i 4, raguwar filastik kyauta ya kai 3.48mm, kuma lanƙwan ya zama barga. Tumin siminti na HPMC na kyauta na robobi duk suna ƙasa da madaidaitan robobin free shrinkage na turmi siminti na yau da kullun, wanda ke nuni da cewa robobin free shrinkage na turmi siminti na HPMC duk sun yi ƙasa da na turmi siminti na yau da kullun. Tare da karuwar abun ciki na HPMC, raguwar filastik kyauta na turmi siminti a hankali yana raguwa. Idan aka kwatanta da turmi na siminti na yau da kullun, ƙarancin filastik kyauta na turmi siminti na HPMC wanda aka haɗe da 0.1% ~ 0.2% (mass juzu'i) yana raguwa da kusan 30%, game da 2.45mm, kuma ƙarancin filastik kyauta na 0.3% turmi siminti na HPMC yana raguwa da kusan 40 %. Yana kusan 2.10mm, kuma ƙarancin filastik kyauta na 0.4% turmi siminti na HPMC yana raguwa da kusan 50%, wanda shine kusan 1.82mm. Saboda haka, a cikin wannan hanzarin fashewar lokaci, ƙarancin filastik kyauta na turmi siminti na HPMC ya yi ƙasa da na turmi siminti na yau da kullun, yana nuna cewa haɗa HPMC na iya rage raguwar robobin siminti kyauta.

Daga tasirin abin da ke cikin HPMC akan ɗigon filastik kyauta na turmi siminti, ana iya ganin cewa tare da haɓaka abun ciki na HPMC, raguwar filastik kyauta na turmi siminti a hankali yana raguwa. Dangantakar da ke tsakanin faɗuwar filastik kyauta (s) na turmi siminti da abun ciki na HPMC (w) ana iya haɗa shi ta wannan dabarar: S= 2.77-2.66 w

Abubuwan da ke cikin HPMC da siminti romi filastik kyauta na raguwar sakamakon binciken bambance-bambancen layin layi, inda: F shine ƙididdiga; Sig Yana wakiltar ainihin matakin mahimmanci.

Sakamakon ya nuna cewa ma'aunin daidaitawar wannan ma'aunin shine 0.93.

2.2 Tasirin abun ciki na HPMC akan adadin asarar ruwa na turmi siminti

A karkashin yanayin hanzari, ana iya gani daga canjin asarar ruwa na turmi siminti tare da abun ciki na HPMC, yawan asarar ruwa na simintin turmi a hankali yana raguwa tare da karuwar abun ciki na HPMC, kuma yana nuna raguwar layi. Idan aka kwatanta da yawan asarar ruwa na turmi siminti na yau da kullun, lokacin da abun ciki na HPMC ya kasance 0.1%, 0.2%, 0.3%, 0.4%, bi da bi. 29.4%, bi da bi. Haɗin HPMC yana rage asarar ruwa na turmi siminti kuma yana sa ƙarin ruwa shiga cikin hydration na turmi siminti, don haka samar da isasshen ƙarfi don tsayayya da fashewar haɗarin da yanayin waje ya kawo.

Dangantakar da ke tsakanin siminti turmi asarar ruwa (d) da abun ciki na HPMC (w) ana iya daidaita su ta wannan dabara: d= 0.17-0.1w

Sakamakon binciken bambance-bambancen koma baya na layin HPMC da siminti turmi asarar ruwa ya nuna cewa daidaitawar wannan ma'auni shine 0.91, kuma daidaituwar a bayyane take.

3. Kammalawa

Rawanin robobi kyauta na turmi siminti yana raguwa sannu a hankali tare da haɓaka abun ciki na HPMC. The filastik free shrinkage na siminti turmi tare da 0.1% ~ 0.4% HPMC yana raguwa da 30% ~ 50%. Adadin asarar ruwa na turmi siminti yana raguwa tare da karuwar abun ciki na HPMC. Adadin asarar ruwa na turmi siminti tare da 0.1% ~ 0.4% HPMC ya ragu da 9.0% ~ 29.4%. Rawanin filastik kyauta da asarar ruwa na turmi siminti suna layi ɗaya tare da abun ciki na HPMC.