Concrete milling, paving & compaction

The demand for road construction material research and testing services in Kenya is expected to soar. The East African country is going through a construction boom, despite policy and financial challenges facing public institutions overseeing the research and testing operations in the transport industry. “Kenya is going through a construction boom and so is the demand for construction material testing services,” said Juma Ali Madzitsa, Geotechnical Lab Supervisor at SGS Kenya, a subsidiary of Swiss based in

Trelleborg has unveiled its innovative cast-in profile sealing system at the recent 2017 Rapid Excavation & Tunnelling Conference (RETC). The firm says that its latest cast-in profile sealing systems are designed to help ensure that tunnelling projects keep to project timescales and budgets. The design of the units also helps to shorten the production process of concrete tunnel gaskets according to the firm.

Fibre-reinforced concrete (FRC) has long been used for road pavements and is now a common material for civil engineering applications such as precast tunnel segments and sprayed concrete linings. However, testing FRC is challenging because the fibres – which are usually steel or macro-synthetic – rupture suddenly, causing the specimen to lose its bearing capacity. During this critical phase any sudden release of elastic energy by the frame of the testing machine may cause the premature rupture of the specim

In the US, considerable experience has been gained with thin white-topping (TWT), with the technique now being used in other countries as well. In the US hundreds of km of TWT is being paved every year, much of it across the mid-western states. A variation of white-topping is being used in Oregon to replace badly rutted asphalt truck lanes on primarily long uphill grades with durable, continuously reinforced concrete pavement (CRCP). Oregon has carried out several of these concrete inlay projects over the

Tough competition is being seen in the specialised market for concrete slipforming machines, with new partnerships and new technology coming to market - Mike Woof writes GOMACO is boosting the versatility of its Commander slipformer further with the development of the new Three-Track Commander IIIx variant. This has been configured to cope with much tighter radii than previous versions of the Commander III, allowing it to slipform a radius of just 610mm. This suits the machine to applications such as sli

Transtec Group has launched what it says is a powerful upgrade for concrete maturity and temperature monitoring. Command Center 2.0 (CC 2.0) includes updated desktop and mobile software, improved readers for data collection and a more durable, highly visible sensor cable.

Allen Engineering is introducing a new high-frequency vibrator for use in concreting. The firm’s Intelli-Vibe unit is said to offer a powerful, compact and efficient solution for better concrete consolidation in most applications. The AHFV22 vibrator can deliver high quality concrete finishing and benefits from the new Intelli-Vibe system, which features internal sensors that control the vibration in response to concrete slump variations and rebar blockage. According to the firm, this ensures consistent

A novel dual-layer concrete paving technique has been used on jobsites in Germany on the country’s high-speed Autobahn network This technique allows the construction of a strong and durable roadway structure able to cope with heavy traffic loads and offer a long working life. In four German states, Wirtgen SP-1500 slipformers have been employed by four different contractors to carry out dual-layer paving. The method allows a noise-reducing, non-skid exposed aggregate surface to be placed over a bottom

A key road in Costa Rica has been upgraded and now features concrete construction CEMEX Latam Holdings, a subsidiary of CEMEX, supplied the cement needed for the project to upgrade a 50km stretch of the Inter-American Highway in Costa Rica.