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23 June 2021 | Story Leonie Bolleurs | Photo Supplied
The Department of Engineering Sciences (EnSci) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists to create a green concrete that will reduce the impact of cement on the environment.

Conventional cement production is responsible for more than 6% of the overall carbon emissions in the world, which ultimately affects global warming.

The Department of Engineering Sciences (EnSci) at the University of the Free State (UFS) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists from universities in South Africa and abroad to create a green concrete that will reduce the impact of cement on the environment.

This product has the potential to be used as an alternative to conventional concrete in large-scale constructions such as residential buildings and infrastructure, as well as small-scale constructions such a pavements and brickworks. 

Dr Nagizadeh, whose passion is cement and green concrete, says the idea of eco-friendly concrete was considered by European researchers a few years ago; however, this technology is still in its initial stages and has not been researched and employed at industrial scale yet. He believes that it is due to the complexity of the preparation process, and the relatively aggressive chemicals used in green concrete mixtures.

Expertise and equipment 

With his knowledge and experience of the product, Dr Naghizadeh – who joined EnSci in 2020 – has been appointed project leader of a collaborative group of scientists from the Universities of Johannesburg, KwaZulu-Natal, Yaoundé in Cameroon, and the Erzurum Technical University in Turkey.  

“Since there are only a limited number of researchers in this field, EnSci is benefiting from the expertise of this international collaboration. The proficiency of this group of scientists are keeping the project current, based on the latest findings in the research area,” says Louis Lagrange, Head of the Department of Engineering Sciences. 

Based on this new capacity, the department decided to establish and equip a new laboratory facility dedicated to cement and concrete research, with a specific current focus on green concrete. 

In this laboratory, they want to create formulations of green concrete, based on user-friendly materials. Furthermore, they aim to simplify the preparation and mixing process. “This can introduce a more eco-friendly, desirable product that can easily be employed extensively in the construction industry,” says Lagrange.

Benefits and other advantages

Besides its ability to reduce the impact on the environment through reduced carbon emissions, the product is also described to perform at equal or even superior strength and durability compared to conventional concrete, with potentially substantial environmental and economic benefits. 

This product is also primarily made from waste materials or industrial by-products. Dr Naghizadeh explains it as follows: “Normal concrete consists of conventional (Portland) cement, sand, stone and water, while in green concrete the conventional cement part of the concrete mix is replaced by industrial wastes or by-products and alkali solutions. These alternative materials are mostly aluminosilicate materials such as fly ash (residue from coal burning process in power plants) and slag (waste material from iron extraction processes).”

“Using these waste substances as binding material in green concrete can, apart from the environmental benefits, also reduce waste and contribute to the circular economy. Annually, more than 36 million tons of fly ash are produced in South Africa alone, of which more than 90% is deposited at landfill sites. Reuse of these waste materials will moderate the related waste deposition issues, such as air and groundwater pollution.”

Production of green concrete

Currently, green concrete is mostly produced in two parts: a solid raw material and an alkali activation solution. With their project, the research group wants to develop green concrete in a powdered form, to be mixed with water, instead of a chemical. Dr Nagizadeh estimates that the construction industry will be able to benefit from their work in about two years’ time when they will have a user-friendly green concrete product ready. 

Apart from putting an eco-friendlier concrete on the market, this project is also establishing a brand-new research niche in the UFS Department of Engineering Sciences. According to Lagrange, this research has the ability to attract postgraduate students and other researchers. He is also looking forward to the international academic recognition that EnSci will receive through published articles in leading international journals, and the participation of researchers in accredited conferences arising from this project. 

Lagrange is pleased that the project is establishing EnSci as a research player of note in the engineering field, specifically in the green engineering field. 

News Archive

You touch a woman, you strike a rock
2004-11-02

Prof. Engela Pretorius van die Departement Sosiologie in die Fakulteit Geesteswetenskappe by die Universiteit van die Vrystaat het die kwessie omtrent feminisme aangespreek tydens haar intreerede met die onderwerp, You touch a woman, you strike a rock: Feminism(s) and emancipation in South Africa .

Prof. Pretorius het gesê: “Die geskiedenis van feminisme oor die algemeen kan in drie fases verdeel word, waarna verwys word as golwe. Eerste-golf-feminisme (19de eeu) het die fokus geplaas op die beskerming van vroueregte in die openbare terrein, spesifiek die reg om te stem, die reg tot onderrig en die reg om middelklas beroepe en professies te betreë.

Vroeë tweede-golf-feminisme word onthou vir hoe dit moederskap geteoretiseer het as synde ‘n onderdrukkende instelling. Slagspreuke van die 1970s was die persoonlike is polities en susterskap is magtig. Prof. Pretorius sê beide slagspreuke bevestig die idee dat vroue universeel onderdruk en uitgebuit word en slegs deur erkenning van dié situasie kan vroue die strukture wat hul onderdruk verander.

‘n Belangrike aspek van die derde golf van die feminisme-teorie is post-moderne feminisme wat diversiteit en verskille onderstreep. Die poging van hierdie feministe is afgestem op alle vorme van onderdrukking. Vroue van kleur het ook hul ontevredenheid uitgespreek gedurende die derde-golf-feminisme. Die feminisme van vroue van kleur word gekenmerk deur verskeie kwessies en talryke intellektuele standpuntinnames wat neerslaga vind in verskillende terme, soos Afrika feminisme of ‘womanism, sê prof. Pretorius.

Afrika-feminisme dui protes aan teen die wit/westerse geskiedenis en die wit/westerse dominansie binne feminisme. Afrika-vroue het besef dat hul onderdrukking verskillend is van dié van wit vroue en daarom is ‘n ander proses van bevryding nodig. Die Westerse feministiese praktyk om swart vroue by die bestaande feministiese ontologie te voeg, is nie voldoende nie omdat hul unieke ondervindings van slawerny, kolonialisme, onderdrukking deur mans en armoede nie uitgedruk word nie.

‘Womanism’ het tot stand gekom as gevolg van ‘n eksplisiete rassekritiek teen feminisme. Dit is ten gunste van die positiewe uitbeelding van swart mense. Dit word gekenmerk deur kulturele kontekstualisasie, die sentraliteit van die gesin en die belangrikheid daarvan om mans in te sluit.

Die geskiedenis van vroue in Suid-Afrika is verwant aan hul geskiedenis van onderdrukking as gevolg van patriargie. Vroue van verskillende rasse, kulture en klasse het patriargie op verskillende wyses in en variërende mate van erns ervaar. Onder voor-koloniale patriargie het vroue min sê gehad oor huwelikskeuses omdat mans dié besluite gedomineer het.

Die Nederlandse en Britse patriargale erfenis het neerslag gevind in die ideologie van die volksmoeder. Onderwyl dit veral manlike skrywers was wat die beeld van die vrou as versorger en tuisteskepper bevorder het, het vroue self ook hieraan ‘n aandeel gehad, sodat die volksmoeder volwaardig deel geword het van die Afrikaner nasionalistiese mitologie. Alhoewel middel- en werkersklas vroue met dié beeld geïdentifiseer het, het nie alle Afrikaanse vroue die ideologie aanvaar nie.

Onder die Victoriaanse erfenis was Britse vroue beperk to die private eerder as die openbare lewe. Die skeefgetrekte onderrigsisteem wat vroue in huishoudelike loopbane gekanaliseer het, die mag van mans oor hul vroue se eiendom en ‘n tekort aan toegang tot mag en geld het verseker dat vroue by die huis gebly het.

Wit Engelssprekende-vroue het die grootste geleentheid gehad om patriargie uit te daag vanweë hul toegang tot onderwys en die blootstelling aan liberale waardes, sê prof. Pretorius. Liberale vroue soos Helen Joseph en Helen Suzman het ‘n belangrike rol gespeel om in 1930 stemreg vir wit vroue in Suid-Afrika te verseker en het voortgegaan om ‘n rol te speel in die bevryding van swart vroue gedurende die vryheidstryd.

Die feminisme wat onder swart vroue ontwikkel het, was ‘n erkenning van die gemeenskaplike stryd met swart mans om die verwydering van die juk van eksterne onderdrukking en eksploitasie. Swart vroue in aktiewe en onafhanlike politiese rolle het tegelykertyd mans se aannames omtrent hul meerderwaardigheid asook die rassewette van die staat uitgedaag. Daarom kan ons sê dat die feminisme wat hier ontwikkel het, te voorskyn gekom het as gevolg van vroue se betrokkenheid by en toewyding tot nasionale bevryding, sê prof. Pretorius.

Institusionalisering is nie herlei tot magsvoordele nie, want gelykheid is nie in beleidsprogramme geïnkorporeer nie. Die hervestiging van sleutel aktiviste van die vrouebeweging in die regering het die stryd om genderbillikheid verander na ‘n projek wat deur die regering gelei word, sê prof. Pretorius. Ongelukkig word terreine van verandering buite die grense van die regering verwaarloos. Dit kan slegs aangespreek word deur ‘n aktiewe en feministiese stem in die burgerlike samelewing.

“Dit is my oortuiging dat formele instellings vir vroue binne die staat oor die lang termyn slegs effektief kan wees indien daar ‘n effektiewe feministiese vroue-beweging buite die staat in stand gehou word wat die grondslag waarop sosiale beleid gevorm word, kan uitdaag en bevraagteken. Daarom, A luta continua (die stryd duur voort),” sê prof. Pretorius.

Mediaverklaring
Uitgereik deur: Lacea Loader
Mediaverteenwoordiger
Tel: (051) 401-2584
Sel: 083 645 2454
E-pos: loaderl.stg@mail.uovs.ac.za
2 November 2004

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