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High production costs of concrete in combination with the high CO2 footprint of cement has

instigated the research, development and application of concrete utilizing by-products and wastes as

partial or entire binder replacements.

Due to theMurray & Robertsconstant pursuit of innovation and sustainability, the geopolymer

concept was driven strongly as the balance between environment, social consciousness and

economics.

The use and removal of waste/by-products for the benefit of communities and the environment is

understandable, the more difficult issue of economical feasibility was the challenge to overcome.

Through research and developmentMurray & Robertshave overcome these hurdles, and the

geopolymer concept is beginning to reach fruition.

Geopolymer concrete is the first goal to be realized; with applications in the mining, precast and road

industries near to fulfilment.

Since the historical applications from the Egyptian and Mayan pyramids to more recent structural

applications at the University of Queenslands Global Change Institute, geopolymer concrete or 0%

cement concrete is evolving as an alternative structural building material to conventional concrete.

Geopolymer concrete has the standard beneficial properties of conventional concrete blended with

the control mechanisms of resin-based materials while reducing by-product and waste materials that

are increasing in quantities far beyond current needs across all industries.

Additional benefits surmounting conventional concretes limitations can be engineered into the

geopolymer such as thermal shock resistance for smelters, additional bond strength for shotcrete

applications, acid-resistance for high durability waste water treatment works and/or air-curing for

convenience.

These applications enhanceMurray & Robertscore values of Care, Integrity, Respect,

Accountability and Commitment while aligning to our business principles of being South Africa'sleading engineering, contracting and construction services company that subscribes to good

corporate governance, good corporate citizenship and ethical business practices.

The extended use of these by-products and wastes has also been a personal goal for the past 15

years with the incorporation of ARC technology to extend conventional concretes up to 85% with by-

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products to enhance durability and strength while reducing the massive impact of the construction

industry on the environment.

AboutMurray and Roberts

Murray & Robertsis one of South Africas leading engineering, contracting and construction services

company. It has created employment, developed skills, applied technology and delivered

infrastructure throughout South and Southern Africa.

The company offers civil, mechanical, electrical, mining and process engineering; general building,

construction and infrastructure development services in the global underground mining market and

selected emerging markets in the natural resources and infrastructure sectors.

Murray & Roberts operates in Southern Africa, Middle East, Southeast Asia, Australasia and Northand South America. The company is based in Johannesburg South Africa, where it has a public

listing on the JSE Limited. It has principle offices in Australia, Botswana, Canada, Namibia and

United Arab Emirates.

Murray & Roberts is a group of world-class companies and brands aligned to the same purpose and

vision, and guided by the same set of values.

The Concrete Centre of Excellence aims to enhance our competitiveness in the way in which

concrete is used across the Murray & Roberts companies.

This Centre of Excellence specifically focuses on enhancing competitive advantage through practical

advanced concrete technology and coordinating the development of competence in specialist

applications.

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