Blockyards can boost housing and employment

BLOCKYARDS CAN BOOST

HOUSING AND EMPLOYMENT

With South Africa experiencing a critical shortage in housing and Covid-19 having boosted unemployment, the manufacture of concrete bricks and blocks could help provide aff ordable building materials and assist in starting small businesses, says Matthews Magwaza, lecturer at Cement & Concrete SA’s School of Concrete Technology.

Among the school’s online courses this year is SCT13 “Making Concrete Bricks and Blocks”, a half-day course providing a rudimentary understanding of how to manufacture masonry units that could become the cornerstone of a new business.

Magwaza says the small-scale production of concrete bricks and blocks for masonry is ideal for entrepreneurs. “Manufacturing can be done outdoors, the process is simple and the equipment required isn’t exorbitantly expensive. However, before starting any brick and block manufacturing

(Left): Matthews Magwaza, lecturer at the CCSA School of Concrete Technology, says the small-scale production of concrete bricks and blocks for masonry is ideal as a small business venture. operation, it’s essential to investigate the economic feasibility of the venture.”

Equally important is determining what the demand is for concrete blocks and bricks in the proposed area of operations and whether there is competition from other blockyards. Only once these factors have been established should costs of production and output enter the equation.

To assess costs, the following should be taken into consideration: • The purchase price or rental of the site. • The cost of site improvements, such as fencing, paved areas for production and stockpiles, pathways, roadways and buildings. • The cost of equipment such as a concrete mixer, a block-making machine, tools, wheelbarrows and trolleys. • Water and electricity tariff s. • The material costs. “As a rough guide, assume that 1m³ of loose aggregate will yield 0,7m³ of concrete volume,” suggests Magwaza. • The projected output in terms of number of blocks required and their dimensions,

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as well as whether the blocks will be solid or hollow. • Wastage volumes. • Maintenance costs of the equipment and site. • Labour costs. • The cost of obtaining start-up fi nance.

Magwaza says that in selecting a site, the blockyard operator should consider the distance to the suppliers of raw materials, the market for the blocks and bricks, where the labour force who will be hired live, the quality of security in the area and the availability of services such as roads, water, sewerage and electricity.

“The ground should be relatively level, as steep slopes make handling and production diffi cult. The site should also be big enough to stockpile aggregates as well as cement, production equipment, block-stacking, staff facilities, a small offi ce and on-site access. Concrete slabs should be provided for the storage of cement (ideally in a weatherproof room, covered with tarpaulins and raised from a possibly damp fl oor), as well as aggregate stockpiles which tend to be unusable after being in prolonged contact with the soil. Aggregate stockpiles should be on a slight slope so that rainwater doesn’t collect in them.”

(Left): New online technologies mean that students from even the most remote parts of SA need not miss class if they cannot travel. They can now enrol for the CCSA School of Concrete Technology’s online training.

Even more training options

Concrete manufacturers and contractors throughout SA have unprecedented opportunities to expand their concrete knowledge because of the development of accredited online training courses.

The School of Concrete Technology’s offering of online training this year covers 10 courses, aimed at diverse levels of competency in the industry. John Roxburgh, senior lecturer at Cement & Concrete SA’s School of Concrete Technology (SCT), says that whereas in the past, potential students in places such as Durban and Cape Town were off ered only a handful of live courses every year, the introduction of online training by the school now means hundreds of students based in even the most remote areas of SA can register and receive such essential training.

“The time involved in attending the courses has also been drastically reduced. The courses normally presented live stretched over one to fi ve days, but, in the online environment, the training can be stretched over a few more days to cater for students who need to do most of their studies after work. The SCT is also off ering substantial discounted costs this year,” says Roxburgh.

The courses for which “fl exi-time” online training is now nationally available are: • SCT10 “Introduction to Concrete”: A course recommended for small-, medium- and micro-enterprises, junior technical and sales staff or any individual seeking a short introduction to concrete. • SCT12 “Mortars, Plasters, Screeds and Masonry”: Originally developed to assist National Home Builders Registration Council inspectors, the course explains best practices for sand-cement mixes, what can go wrong with them and how to prevent such problems. It is ideal for masons, those managing projects and people who will be assessing the fi nished work. • SCT13 “Making Concrete Bricks and Clocks”: A course that provides a rudimentary understanding of how to manufacture masonry units that could become the cornerstone of a new business. • SCT15 “Concrete for Batchers and Batch Plant Staff ”: This course covers important training on how to produce quality readymix concrete. • SCT20 “Concrete Practice”: Recommended for foremen, clerks-of work, technicians, supervisors, sales and technical staff in the construction and mining industries. • SCT21 “Concrete Industrial Floors on the Ground”: Aimed at helping engineers and contractors by giving a broad, detailed and practical overview of all facets of industrial fl oor construction. • SCT30 “Concrete Technology”: An intensive course for civil and structural engineers, experienced technicians and technologists, providing detailed knowledge of how cement and concrete work. Recommended for electrical, mechanical and mining engineers to meet their mining qualification requirements. • SCT36 “Properties of Concrete for the Structural Designer and Constructor”: A special course for engineers with experience or training in concrete technology to refresh their knowledge of important concrete concepts. • SCT41 and SCT42 “Concrete Technology and Construction (Stages 2 and 3)”, off ered by the Institute of Concrete Technology of London: These are ideal bridging courses for potential candidates for the intensive SCT50 “Advanced Concrete Technology” diploma, the world’s leading qualification in concrete technology, run at the SCT every two years.

Roxburgh says the online versions of the training courses have been enthusiastically welcomed by students. “The lockdown has given people more time to study and they’ve learnt how to use online meeting platforms such as Zoom and Teams. The discounted tariff s now off ered by the school have also been a major incentive.

“The fact that we can off er training for a specifi c company’s personnel – at a suitable time for the client – also means that staff productivity can be maximised, as there’s no travel or lecture room time involved. Furthermore, as the lecture sessions are recorded, a delegate who misses one can view it later,” he explains.