Razvoj cementa CEM v Lafarge Cement d.d.

diplomska naloga

Blanka Povše (Author), Andreja Goršek (Mentor), Lucija Hanžič (Co-mentor), Desanka Petrič (Co-mentor)

Abstract

Diplomsko delo smo namenili razvoju cementa CEM V/A (S-V-P) 42,5N LH. Glavni cilji raziskav so bili: • razviti lastnosti cementa CEM V/A (S-V-P) 42,5N LH, primernega za širšo uporabo, • znižati emisije CO2 na tono proizvedenega cementa, • znižati porabo energije na tono proizvedenega cementa, • znižati variabilne stroške na tono cementa, • zmanjšati vpliv na okolje z vidika ponovne uporabe odpadnih materialov, • povečati razmerje cement glede na klinker (C/K faktor) na tono proizvedenega cementa in • ohraniti oziroma povečati tržni delež (LH). CEM V/A (S-V-P) 42,5N LH cement (v nadaljevanju CEM V) poleg klinkerja vsebuje še elektrofiltrski pepel, granulirano plavžno žlindro, pucolan in sadro. S tem dosežemo nižjo proizvodno ceno cementa, hkrati pa se morajo njegove lastnosti ohraniti oziroma izboljšati. CEM V ima, predvsem s stališča večje odpornosti proti alkalnosilikatni reakciji, proti sulfatni koroziji in proti prodoru kloridov, tudi pozitivne učinke na trajnost betonov. Prav tako ima CEM V tudi pozitivne učinke na obdelavnost betonov (konsistenco), znižuje krčenje betona in sprošča manj toplote, kar preprečuje nastanek notranjih razpok, predvsem v masivnih betonskih elementih. CEM V ima pri isti zrnatosti mletja nekoliko nižje začetne trdnosti (po 1 dnevu), običajno pa ima po 28 dneh večje trdnosti, kot primerjalni portlandski mešani cement CEM II/B-M (P-S-L) 42,5N, predvsem z vidika pucolanskih reakcij elektrofiltrskega pepela in tufa. Glavna naloga razvoja CEM V je bila doseči in preseči lastnosti cementa, ki omogoča širšo uporabnost predvsem za proizvodnjo transportnih betonov s stališča fizikalno mehanskih in trajnostnih vidikov. Z laboratorijskimi testi in industrijskimi meljavami smo definirali pravilno recepturo cementa CEM V, ki je ustrezala zahtevam standarda SIST EN 197-1 in hkrati zagotavljala maksimalno C/K razmerje. Na osnovi teh testov in osnovnih parametrov proizvodnje smo predpisali tudi tehnologijo proizvodnje cementa CEM V in opredelili morebitne dopolnitve tehnologije proizvodnje in mletja le-tega.

Keywords

gradiva;gradbeni materiali;cement;proizvodnja cementa;sestava cementa;odpornost cementa;CEM cement;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Maribor
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[B. Povše]
UDC:	666.94.01
COBISS:	14262550
Views:	3354
Downloads:	294
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Development of cement CEM in Lafarge Cement d.d.
Secondary abstract:	Scope of work is on the development of cement CEM V (SVP) 42.5 N LH, which main objectives are: • to develop properties of cement CEM V/A (S-V-P) 42,5N LH suitable for wide usage, • to reduce CO2 emission per ton of produced cement, • to reduce energy consumption per ton of produced cement, • to reduce of variable costs per ton of produced cement, • to lower environmental impact due to recycling of waste material, • to increase ratio between cement and clinker (C/K factor) per ton of produced cement and • to maintain and increase market share (LH). CEM V/A (S-V-P) 42.5 N LH (abbreviated as CEM V) cement which beside clinker contains also fly ash, ground granulated blast furnace slag, gypsum and pozzolan. The result is cement with lower production cost where the main characteristics of commercial cement are maintained. CEM V has also positive effects on concrete durability, especially in terms of higher resistance, better reaction, resistance to sulphate corrosion and resistance to penetration of chlorides. Additionally CEM V has positive effect on concrete workabilitiy (consistency), is proved to reduce shrinkage and heat release of concrete and thus prevents micro-cracking of hardened concrete. The CEM V has at the same grinding fineness slightly lower initial strength (after 1 day) and usually higher strength (after 28) than the reference mixture of Portland cement CEM II/B-M (P-S-L) 42,5N, due to pozzolanic reaction of fly ash and pozzolana. The main task in development of CEM V was to achieve and surpass the properties of cement, as to allow wider applicability, particularly in the manufacture of transport concrete in the aspect of improved physical and mechanical properties and durability of concrete. With the laboratory tests and industrial milling, a new composition of CEM V was designed, which corresponded to the requirements of standard SIST EN 197-1, having the maximum C/K factor as well. According to tests and basic parameters the technology of milling and production of CEM V was defined.
Secondary keywords:	cement production process;
URN:	URN:SI:UM:
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	[X], 70 str.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;chemical technology;chemical and related industries;kemijska tehnologija;kemijske in sorodne industrije;glass industry;ceramics;cement and concrete;industrija stekla;keramika;cement in beton;gypsum;lime and cement industries;hard-setting materials;plasters and compositions;mortar and concrete;industrije mavca;apna in cementa;vezivni materiali;ometi in sestavne zmesi;malta in beton;
ID:	1011301