QUARRY AND AGGREGATES
Aggregates consumption saw its fragile recovery slow down, in 2016
In 2016, there has been a decade of decline in aggregate consumption in Spain, a process that has had an evolution in two stages: between 2006 and 2012, a steep fall of -80% accumulated and, since then, stagnation with small fluctuations. Despite the positive evolution of the national economy, the construction sector and the industries directly linked to it continue their flat evolution, without seeing a way out of the current situation.
Novelties in the Spanish Cements Reception Instruction, RC-16
This paper presents the approach of the Spanish “Cement Reception Instruction (RC-16)” that replaces the previous Instruction RC-08, in order to comply with provisions in the Regulation (EU) No. 305/2011 of the European Parliament and of the Council of 9 March 2011 laying down harmonized conditions for the marketing of construction products, amended by regulation delegate (EU) No. 574/2014 of the Commission of 21 February 2014.
This Instruction also includes the upgrade of the new harmonised standards of cements and the current regulations concerning those cements which do not have harmonized European standard. In this way, the administrative requirements for the implementation in the market of cements legally marketed in Spain in the field of cement reception in construction sites, in concrete manufacturing plants and in any other installations of construction products where cement is used, have been updated.
EQUIPMENT PROVIDERS 1
Level measurement in hard applications
The building materials industry makes special demands on level measurement. Sensors with diff erent measuring ranges are required, for example, for all the measuring jobs in the production of cement. Raw meal, clinker and fi nished cement are stored in silos of diff erent heights. Until now, although the use of a radar level measuring instrument was possible, it sometimes demanded all the skill of the technicians. This was because too many interference signals made the detection of the actual useful signal difficult. The new radar level measuring instrument VEGAPULS 69 is now recommended for many applications in this industry thanks to better focusing.
EQUIPMENT PROVIDERS 2
MasterEase superplasticizers based on BASF exclusive PAE technology
BASF Construction Chemicals has introduced MasterEase, the latest generation of superplasticizers for concrete. It is based on BASF’s innovative and exclusive technology of PAE polymers. MasterEase represents a step forward on the development of concrete technology, aiming to produce concrete with improved sustainability.
The contribution on concrete rheology provided by PAE polymers allows to produce low-viscosity concrete even under conditions of low W/C ratio and low water/fi nes (by vol.) ratio. This property of MasterEase superplasticizers based on PAE polymers can be handled to optimize concrete mix design in order to reduce
CO2 footprint while providing economical savings.
The superior rheological properties of concrete treated with MasterEase provide additional advantages specially in pumped concrete. The reduction of viscosity allows to increase productivity by 3-4 m2/h while reducing pumping pressure up to 60 bar. This advantages are supported by an improved filling of the cylinder due to the reduction of friction linked to the lower viscosity of concrete.
EQUIPMENT PROVIDERS 3
Packaging cement the sustainable way
An independent study compares the environmental impact of three types of cement packaging: kraft paper sacks, sewn cement sacks made of recycled polypropylene tape fabric, and hot-air welded AD*STAR cement sacks made of coated polypropylene tape fabric. In the life cycle assessment the environmental impact of each cement sack was reviewed by evaluating six internationally accepted LCIA indicators, thereby taking into consideration the country-specific conditions regarding the life cycle of each sack.
The results show that both the paper cement sacks and the sewn woven polypropylene sacks have a higher environmental impact in all reviewed categories than the AD*STAR cement sacks. This is mainly due to the very low breakage rate of AD*STAR sacks which accounts for less cement loss and lower replacement production of cement and cement sacks. Consequently, less greenhouse gases are produced and the environmental impact is reduced signifi cantly.
EQUIPMENT PROVIDERS 4
CPV Monjos and FLSmidth Pfister, feedback of the alternative fuel installation
With this article we like to inform you about the feedback of the use of alternative fuels at CPV Monjos. This is not only related to the Pfister scale but advices from experience.
Modular concrete construction: an upward trend
Since the North American architect Edward T. Potter registered on the end of 19th Century the first patent of precast building based on three-dimensional stackable concrete modules, there are now more than 1.300 patents worldwide related to this technology. However, it has not been until now, when this construction methodology has started to be accepted by designers, builders and, specially, final users. Based on the pre-construction or the nearly-full prefabrication of construction elements, and following a modular layout, it leads to bring forward to the factory as many tasks as possible to minimize those actions to be carried out on the work itself.
The future prospects show that this methodology is one of the key factors of the current construction, foreseeing also that in just five years more than a half of the projects will be using this approach. This article is intended to show the state-of-the-art of this technique, analysing the advantages with regard to the conventional construction and explaining the challenges to be faced by the precast concrete industry which is firmly betting for this business line.
Roadmap of the Spanish cement industry for the reduction of carbon emissions 2050
Current trends in energy supply and use cannot be sustained economically, environmentally or for our society. We can and must change the path that we are on: this will take an energy revolution, with low carbon energy technologies at the centre.
Cement and concrete will be pivotal to addressing many of today’s critical issues through sustainable building and infrastructure development. But this has to go hand in hand with concerted efforts to reduce our emissions. Our industry already helps current energy efficiency targets of low-carbon and low-energy life cycle consumption in the building sector to be met by providing key materials to construct very low or even zero-energy buildings.
This roadmap presents a vision for the sector whereby the cement carbon footprint could be reduced by 35% compared with 1990 levels, using mostly conventional means. It also describes potential levers for how this could be further increased by the application of emerging new technologies, such as carbon capture and storage (CCS). Subject to specified policies and technological prerequisites, a potential reduction of up to 80% may be envisaged.
The industry has focused on three routes to achieve these objectives: mitigation in production, mitigation in use and adaptation.
FDR with cement in the Improvement, reinforcement and widening of La Roda - Barrax 18 km road in Albacete (Spain)
In the period February to July 2016, the “Dirección Provincial - Consejería de Fomento en Albacete - Junta de Castilla-La Mancha” has carried out the works of Widening, Improvement and Reinforcement of the road “Ctra. CM-3135 PKs. 0+000 to 17+800”, section La Roda - Barrax, in Albacete.
These works contemplated the Full Depth Reclamation on site with cement of the existing pavement that has been realized in a nominal thickness of 25 cm and on the full width of the platform. This platform had previously been widened by removing the existing berms and laying of a granular material to obtain a final 7 m width platform.
Subsequently, two asphalt layers were paved over the recycled layer to obtain a fi nal pavement structural section corresponding to T32 traffic category according to Spanish Standard 6.1-IC. Recycling works for the approximately 125.000 m2 have taken 6 weeks, with an average performance of 6.000 m2 per day.