Success cases of biodiversity management in aggregates extraction sites
An increasingly important number of aggregate companies apply plans, programs and strategies for the promotion of biodiversity in their extraction sites, which is crucial to be able to continue with the activity, especially in environments that, due to the level of protection or by the existing species, it is very complex to be able to operate.
This article presents practical cases and concrete actions of Spanish and European companies, widely documented.
Sustainability of construction products: from European context to the new Structural Code
This article describes the development of different sustainability assessment building systems both at product/building level and both at European/National level and its connection with the future Spanish Structural Code.
Cement used in a constructive solution that simulates a transparent element
Designers of building projects are very keen on playing with light, through precast concrete panels with a great translucent surface got by repetition of huge amount of small inserts and with the maximum level possible of prefabrication. HeidlebergCement Group developed its i.light panels with this aim. On this kind of products, high quality aggregates and some miner byproducts could provide special features, either as mineral load or as cementitious activity boosters, which are being widely valuated by contribution to construction sustainability.
EQUIPMENT PROVIDERS 1
Fast process from beginning to end
The Cooperativa La Cruz Azul S.C.L, third-largest cement manufacturer in Mexico, required an entire packaging line for the flexible and fully automated filling, palletising and packaging of different types of a new tile mortar. The BEUMER Group solution won out over the competition, providing everything from one single source. This included the BEUMER fillpac R filling system that was adapted for fi lling different materials. They also included the BEUMER bag placer to ensure a more efficient filling of the high-quality materials. With this new packaging line, Cruz Azul can achieve their projected production capacity.
EQUIPMENT PROVIDERS 2
Starlinger: 300th conversion line for AD*STAR block bottom valve sacks
The production of robust sacks is not only based on high-quality polypropylene fabric made from woven tapes, but also on precise sack conversion. In the case of AD*STAR block bottom valve sacks, this important process step is performed on the conversion line ad*starKON. In early 2018, the 300th line of this type was installed on the Philippines.
EQUIPMENT PROVIDERS 3
Portland cement regrinding and activation in the vortex layer apparatus with ferromagnetic particles
The article describes the composition and operating principle of the vortex layer apparatus with ferromagnetic particles. The results of tests of such apparatuses are presented at regrinding and activation of aged cements. The possibility of improving the quality of building materials is proved, in the case of the use of cement for their production, which has undergone further regrinding and activation in the vortex layer apparatus.
Biocide mortars to diminish algae proliferation in hydraulic infrastructures
The algae proliferate in infrastructures in contact with water, unless some treatment is carried out. Its proliferation conditions the proper operation of infrastructures, as well as increases maintenance costs and aff ects durability. Currently, various solutions are used to minimize this growth, such as the use of biocidal liquids in water, or surface troweling in newly constructed structures. In this paper, the authors present a solution based on a biocidal mortar, developed at the UPC in collaboration with BASF Construction Chemicals Iberia. This mortar with biocidal properties has shown a high capacity to avoid biological growth, both in laboratory-scale tests and in full-scale tests. This solution is a very interesting alternative for existing infrastructures.
Establishment of a methodology for the calculation of atmospheric emission factors in the cement sector
The Spanish cement industry, having noted that the emission factors cited in the bibliography traditionally used for national and European inventories and in international protocols did not accurately reflect data from the techniques currently implemented in Spanish facilities, or the environmental issues of these, saw a need to develop a methodology that defined own emission factors, based on real data from the sector, that also provided comparable data.
After identifying the most significant pollutant releases from clinker kilns, the methodology for emission factors was designed, taking into account current practices within the Spanish cement sector, the technological and environmental information available on emissions, and implementation of best available techniques (BAT). A statistical tool was developed to process the data compiled and calculate emission factors.
This paper describes a methodology developed to determine emission factors characteristic of the Spanish cement industry, using real production and technological data. The result is a replicable and comparable method that is apt for the standard calculation of significant air emissions, by pollutant, quantity and frequency. In addition to fulfilling legal reporting requirements, the methodology provides for more accurate, transparent and consistent data on practices involved in industrial processing.
Building the tunnel concrete ring as permanent support is a necessary requirement
The concrete ring as permanent lining or a permanent support is studied in this article due to the importance of its construction in the tunnel costs.
The initial costs involved in the concrete ring (between 30 and 60 cm of concrete thickness) are compensated with the significantly lower maintenance costs throughout all the life of the tunnel. The ease of cleaning work, the best waterproofing and the reduction of ventilation and lighting costs are some of these maintenance operations. To these, an important additional security coeffi cient is added in the medium and long term thanks to the ring construction.
The saving due to its construction is contrasted with the need to guarantee certain safety conditions of the traffic, the need to carry out a continuous control of the state of the projected concrete and the location of a team on the site to be able to replace said shotcrete if necessary. In all cases, the decision not to build the tunnel ring must be justified by a very serious and independent technical study, as it will not be possible to build the concrete lining with the tunnel in service.