Hydroxypropyl methylcellulose ether a kan kaddarorin gardama ash turmi

An yi nazarin tasirin hydroxypropyl methylcellulose ether akan kaddarorin turmi ash gardama, kuma an yi nazarin dangantakar da ke tsakanin yawan rigar da ƙarfi. Sakamakon gwajin ya nuna cewa ƙara hydroxypropyl methylcellulose ether don tashi turmi ash zai iya inganta aikin riƙe ruwa na turmi sosai, ya tsawaita lokacin haɗin gwiwa na turmi, da rage yawan rigar da ƙarfin turmi. Akwai kyakkyawar alaƙa tsakanin jigon yawa da ƙarfin matsi na 28d. A ƙarƙashin yanayin sanannen yawan rigar, ana iya ƙididdige ƙarfin matsawa na 28d ta amfani da dabarar dacewa.

Mabuɗin kalmomi:tashi ash; ether cellulose; riƙe ruwa; ƙarfin matsawa; dangantaka

A halin yanzu, an yi amfani da tokar kuda sosai wajen aikin injiniyan gine-gine. Ƙara wani adadin ash gardama a cikin turmi ba zai iya kawai inganta kayan aikin injiniya da dorewar turmi ba, amma har ma rage farashin turmi. Duk da haka, turmi tokar kuda ya nuna rashin isasshen ruwa, don haka yadda za a inganta ruwa na turmi ya zama matsala na gaggawa don magance. Cellulose ether wani abu ne mai inganci wanda aka saba amfani dashi a gida da waje. Yana buƙatar ƙarawa kawai a cikin ƙaramin adadin don samun babban tasiri akan alamun aiki kamar riƙe ruwa da ƙarfin matsa lamba na turmi.

1. Kayan albarkatun kasa da hanyoyin gwaji

1.1 Kayan danye

Siminti shine P·O 42.5 simintin talakawa na Portland wanda Kamfanin Hangzhou Meiya ya samar; tokar gardama daraja ceⅡtoka; Yashi shine yashi matsakaici na yau da kullun tare da ƙarancin ƙarancin 2.3, babban yawa na 1499kg·m-3, da danshi na 0.14%, laka abun ciki 0.72%; hydroxypropyl methyl cellulose ether (HPMC) an samar da shi ta Shandong Heda Co., Ltd., alamar ita ce 75HD100000; ruwan hadawa shine ruwan famfo.

1.2 Shirye-shiryen turmi

Idan ana hada turmi da aka gyara na cellulose ether sai a fara hada HPMC da siminti sai asha ash sosai, sai a hada busasshen da yashi na tsawon dakika 30, sai a zuba ruwa a gauraya bai wuce dakika 180 ba.

1.3 Hanyar gwaji

Za a auna daidaito, yawan rigar, delamination da lokacin saita sabon turmi mai gauraya bisa ga ƙa'idodin da suka dace a cikin JGJ70-90 "Hanyoyin Gwajin Aiki na Farko na Gina Turmi". An ƙaddara riƙewar ruwa na turmi bisa ga hanyar gwaji don riƙe ruwa na turmi a cikin Shafi A na JG/T 230-2007 "Turmi Mixed Ready". Gwajin ƙarfin matsawa yana ɗaukar 70.7mm x 70.7mm x 70.7mm cube ƙwanƙolin gwaji. Tushen gwajin da aka kafa yana warkewa a zazzabi na (20±2)°C na tsawon sa'o'i 24, kuma bayan zubar da shi, ana ci gaba da warkewa a cikin yanayin da zafin jiki na (20).±2)°C da ɗanɗanon zafi sama da 90% zuwa shekarun da aka kayyade, bisa ga JGJ70-90 “Hanyar gwajin aikin Turmi na Gina “Ƙaddamar da ƙarfinsa.

2. Sakamakon gwaji da bincike

2.1 Rigar yawa

Ana iya gani daga alakar da ke tsakanin yawa da adadin HPMC cewa yawan rigar yana raguwa a hankali tare da karuwar adadin HPMC. Lokacin da adadin HPMC ya kasance 0.05%, yawan rigar turmi shine 96.8% na turmi mai tushe. Lokacin da adadin HPMC ya ci gaba da ƙaruwa, Ana ƙara saurin raguwar yawan rigar. Lokacin da abun ciki na HPMC ya kasance 0.20%, yawan rigar turmi shine kawai 81.5% na turmi mai tushe. Wannan ya faru ne saboda tasirin haɓakar iska na HPMC. Kumfa na iska da aka gabatar yana ƙara ƙuri'a na turmi kuma yana rage ƙanƙara, yana haifar da raguwar ƙarar ƙima na turmi.

2.2 Lokacin saita lokaci

Ana iya gani daga dangantakar dake tsakanin lokacin coagulation da adadin HPMC cewa lokacin coagulation yana karuwa a hankali. Lokacin da adadin ya kasance 0.20%, lokacin saitin yana ƙaruwa da 29.8% idan aka kwatanta da turmi na tunani, ya kai kusan 300min. Ana iya ganin cewa lokacin da adadin ya kasance 0.20%, lokacin saitin yana da babban canji. Dalilin shi ne L Schmitz et al. yi imani da cewa kwayoyin ether cellulose an fi adsorbed a kan hydration kayayyakin kamar cSH da calcium hydroxide, kuma da wuya a yi adsorbed a kan asali ma'adinai lokaci na clinker. Bugu da ƙari, saboda karuwa a cikin danko na maganin pore, ether cellulose yana raguwa. Motsi na ions (Ca2+, so42-...) a cikin maganin pore yana ƙara jinkirta tsarin hydration.

2.3 Layering da riƙe ruwa

Dukansu matakin delamination da riƙewar ruwa na iya siffata tasirin riƙe ruwa na turmi. Daga alakar da ke tsakanin matakin delamination da adadin HPMC, ana iya ganin cewa matakin delamination yana nuna raguwar yanayin yayin da adadin HPMC ke ƙaruwa. Lokacin da abun ciki na HPMC ya kasance 0.05%, matakin delamination yana raguwa sosai, yana nuna cewa lokacin da abun ciki na fiber ether ya ƙanƙanta, za'a iya rage matakin delamination sosai, ana iya inganta tasirin riƙewar ruwa, da aiki da aiki za a iya inganta aikin turmi. Yin la'akari da dangantakar dake tsakanin dukiyar ruwa da adadin HPMC, yayin da adadin HPMC ya karu, ajiyar ruwa kuma sannu a hankali ya zama mafi kyau. Lokacin da adadin ya kasance ƙasa da 0.15%, tasirin riƙewar ruwa yana ƙaruwa sosai a hankali, amma lokacin da adadin ya kai 0.20%, an inganta tasirin ruwa sosai, daga 90.1% lokacin da adadin ya kasance 0.15%, zuwa 95%. Adadin HPMC yana ci gaba da karuwa, kuma aikin ginin turmi ya fara lalacewa. Sabili da haka, la'akari da aikin riƙe ruwa da aikin ginin, adadin da ya dace na HPMC shine 0.10% ~ 0.20%. Binciken tsarin da ke da ruwa: Cellulose ether shine polymer Organic polymer mai narkewa da ruwa, wanda aka raba zuwa ionic da wadanda ba ionic ba. HPMC shine ether cellulose maras ionic tare da ƙungiyar hydrophilic, ƙungiyar hydroxyl (-OH) da ether bond (-0-1) a cikin tsarin tsarin sa. Lokacin narkar da a cikin ruwa, oxygen atoms a kan hydroxyl kungiyar da ether bond da ruwa Molecules hade don samar da hydrogen bonds, wanda ya sa ruwa ya rasa ruwa, da kuma free ruwa ba ya da 'yanci, ta haka samun sakamako na ruwa da kauri.

2.4 Ƙarfin matsi

Daga alakar da ke tsakanin karfin matsawa da adadin HPMC, ana iya ganin cewa tare da karuwar adadin HPMC, karfin matsawa na 7d da 28d sun nuna raguwar yanayin, wanda ya kasance saboda ƙaddamar da adadi mai yawa. na kumfa na iska ta HPMC, wanda ya kara yawan porosity na turmi. karuwa, yana haifar da raguwar ƙarfi. Lokacin da abun ciki ya kasance 0.05%, ƙarfin matsawa na 7d yana raguwa sosai, ƙarfin yana raguwa da 21.0%, kuma ƙarfin matsawa na 28d ya ragu da 26.6%. Ana iya gani daga lanƙwasa cewa tasirin HPMC akan ƙarfin matsawa yana bayyane sosai. Lokacin da adadin ya yi ƙanƙanta, za a rage shi sosai. Sabili da haka, a cikin aikace-aikace masu amfani, ya kamata a sarrafa adadin sa kuma a yi amfani da shi tare da defoamer. Binciken dalilin, Guan Xuemao et al. Yi imani da cewa da farko, a lokacin da ether an ƙara wa turmi, mai sauƙin polymer a cikin turba pores yana ƙaruwa, kuma pores m ba zai iya samar da m goyon baya ba lokacin da aka matsa talla. Matrix ɗin da aka haɗa yana da ƙarancin rauni, don haka yana rage ƙarfin matsa lamba na turmi; Abu na biyu, saboda sakamakon riƙewar ruwa na cellulose ether, bayan da aka kafa toshe gwajin turmi, yawancin ruwa ya kasance a cikin turmi, kuma ainihin ruwa-ciminti rabo ya kasance ƙasa da wannan ba tare da Wadanda suke da girma ba, don haka ƙarfin matsawa. na turmi za a rage muhimmanci.

2.5 Daidaita tsakanin ƙarfin matsawa da rigar yawa

Ana iya gani daga madaidaicin dangantaka tsakanin ƙarfin matsawa da ƙarancin rigar cewa bayan daidaitawar layi na dukkan maki a cikin adadi, an rarraba madaidaicin madaidaicin a bangarorin biyu na layin dacewa, kuma akwai kyakkyawar dangantaka tsakanin rigar yawa da matsawa. kaddarorin ƙarfi, kuma yawan rigar yana da sauƙi kuma mai sauƙin aunawa, don haka ana iya ƙididdige ƙarfin matsa lamba na turmi 28d ta hanyar daidaita daidaitattun daidaitattun layi. Ana nuna ma'auni mai dacewa da layi a cikin dabara (1), R²= 0.9704. Y=0.0195X-27.3 (1), inda, y shine 28d ƙarfin turmi, MPa; X shine rigar yawa, kg m-3.

3. Kammalawa

HPMC na iya inganta tasirin riƙon ruwa na turmi ash kuma ya tsawaita lokacin aiki na turmi. A lokaci guda, saboda haɓakar porosity na turmi, yawancin girmansa da ƙarfin matsawa zai ragu sosai, don haka ya kamata a zaɓi adadin da ya dace a cikin aikace-aikacen. Ƙarfin matsawa na 28d na turmi yana da kyakkyawar alaƙa tare da yawan rigar, kuma ana iya ƙididdige ƙarfin matsawa na 28d ta hanyar auna yawan rigar, wanda ke da mahimmancin mahimmanci don kula da ingancin turmi yayin gini.