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Zoman Mohammed Al Hajri & Partners Contracting Co. (known as Al Zoman Contracting Co.) is a general contracting company specializing in turnkey civil, mechanical & electrical projects, ranging from road & bridges construction to infrastructure & street lighting. The company is classified as First in Road Construction/Earthworks and Second in Electrical, with an annual work capacity of over 350 million riyals and over 1,000 employees. The sister company Riyadh Kingdom for Trading & Contracting LLC operates plants for the production and supply of ready-mix concrete and all other cement products, ranging from paving stones, curb stone and concrete blocks. Riyadh Kingdom Concrete Products planned to expand and approached their long-standing partner HESS GROUP, for support. The partnership between the two companies has now existed close to a decade. 

Misfer Al Zoman, Managing Director of Riyadh Kingdom Concrete Products contacted HESS GROUP in November 2010 regarding the expansion of production capacity. The customer received an order for delivery of 140,000 m? of paving stones and was optimistic about further demand. This has been taken as an signal to expand production capacity.  

In August 2011 HESS GROUP received the order for the delivery of a fully automatic plant based on the machine RH1500-3 and the concrete mixing plant. ?After nine years’ experience with plants of HESS GROUP, we have seen trustful advanced technology, reliable aftersales support and spare parts availability. We are looking forward for further expansions in the future together", said Mr. Misfer Al Zoman. The Plant is installed in the Al Ahsa Area, approx. 150 km away from Dammam.   

Market penetration in Saudi Arabia 

The market in the Middle East, especially in Saudi Arabia, is very dynamic and is constantly developing. Therefore, business success depends heavily on how quickly and well you can respond to market and product developments. The modular equipped plants from HESS GROUP offer significant advantages here. In addition to technical aspects, close and partnership-based cooperation with the customer, experience with local conditions and the willingness to support the customer in all aspects of his business are factors for the market success and consequently a decision criterion of the customer.Trust, empathy and loyalty are values that customers from the region appreciate. 

The concrete block and paver machine RH 1500-3 at Riyadh Kingdom 

The technology has proven itself under difficult local climate conditions up to and over 50°C which are normal conditions in the Middle East during summer time. The RH1500-3 machine is the state of the art technology with 1400x1100 mm pallet size, amplitude controlled vibration (Variotronic) and is equipped with unique oil bath vibration table, which provides permanent lubrication of bearings for very high compaction in short cycle times. The production could reach a steady rate of 5500 square meters of 60 mm height rectangular pavers in 20 hours daily production time.  

The mentioned compaction technology in the RH 1500-3 allows a production of 25 seconds cycle time for curbstones including face mix with 25 cm height. In addition, the advanced filling system with laser sensors in the filler boxes and machine hoppers assure sustainable quality in every cycle. This enables a precise control when filling the mould. As a result, 6 curbstones of a total length of 6 linear meters have a very high density and reach a very high strength, which is comparable to the known wet press products, also produced mainly in the Middle East.  

To secure the cycle time of the machine throughout the output of the plant, a servo-controlled handling system is required. At the wet side, HESS GROUP installed V- belt conveyors, one of the fastest and smoothest possibilities to handle a production board with fresh concrete products. The 14 to capacity elevator, finger cart and lowerator with 20 storeys, are connected to the big chamber curing room with 4180 pallets active capacity. This plant setup has been chosen by the customer in the first plant already, to ensure the production without stops in the production flow.   

From the lowerator a walking beam conveyor transports the cured products on the production boards to the Cuber Servo 700 of HESS GROUP. The cuber is fully electric servo controlled in the movements. Attached to the cuber is the hydraulic clamping device. The cuber will ensure the fastest cycle time to cube the products, as well to keep up with the high speed of the concrete block machine.    

Efficiency through handling and control systems 

Efficiency is the biggest task for a concrete block making plant; therefore, customers are asking for short cycle times. But what counts at the end is the number of high-quality products, going out of the plant and a very limited wastage in production. Therefore, the wet and dry side of the plant have to be harmonized in terms of cycle time setup, depending on the different products produced on the wet and dry side. With a concrete block machine by HESS GROUP a realistic wastage of less than 2 % is possible, through easy operating of the plant with the advanced control systems. The Training Academy of HESS GROUP is also a key point and a special offer from company, where the customers’ operators are well trained in concrete technology, efficient operating of the equipment and about the maintenance and troubleshooting of the plant. The Training Academy will be held by engineers of HESS GROUP wherever there is demand worldwide. 

The concrete plant of HESS GROUP has a buffer system, to ensure that both sides, wet and dry side, are never stopped in their production. The system will supply the wet side with production pallets, if there is a waiting time on the dry side or take out pallets of the system in case the wet side is stopped. Even if there are products with different cycle times on wet and dry side produced, the intelligent buffer system increases the capacity of the plant, by taking in or out production pallets in very short cycle time.   

The block plant is operated by the control system Karajan of HESS GROUP. This is the meaning of a stand-alone touch screen monitor, from which the complete process of the production of the concrete products is controlled.  

Future Prospects 

Saudi Arabia has a young and growing population. This leads to demand for housing and infrastructure. The Kingdom aims to create more jobs for Saudi Arabians (Saudization) and more prosperity. With the Vision of 2030 (Project worth $500 billion Dollars) a master plan was presented. As part of Vision 2030, mega projects such as NEOM are planned or already under progress. This and several other projects require huge amounts of building materials. 

Hess Group has continuous business in Saudi Arabia as well in other countries in the Middle East and implements the lessons learned. 

You can find the entire article in CPI Worldwide 6/2020: https://www.cpi-worldwide.com/uploads/journals/pdf/2020/06/en/en_06_2020_124_128.pdf