Portland cement hydration and fly ash portland cement hydration
Portland cement hydration knowledge is the underpinning part of properties development understanding, not only mechanical characteristics, but also to estimate the potential performance of cementbased materials exposed to diff erent environments, i.e. the durability.
Determining concrete pumpability
Experience has shown that only little changes in a concrete recipe will result in substantial eff ects on concrete pumpability and especially pipe system pressure. In a given situation, one may very well arrive at the conviction that some other pumping constellation than the one initially envisaged will serve its purpose better and hence a new one will be included in project preparation.
Concrete with phase change materials. New technologies for the management of renewable energies (INPHASE project)
At present, the building sector accounts for approximately 40% of current energy consumption in Europe. In Spain, this consumption represents 24% of the total energy consumption and, within buildings, the energy consumption relative to climatization reaches 42% of the total amount.
This fact, together with the energy shortage existing worldwide, has caused a double eff ect. On the one hand, users are increasingly aware of the energy cost they have to aff ord and, on the other hand, public bodies have become aware of the importance of limiting energy consumption in buildings as a way to fi ght climate change and reduce the energy dependence on o her countries.
2nd Congress “Giving Value to CO2”
After a successful first edition in 2015, the second edition of “Giving Value to CO2” took place at the Institute of Chemical Research of Catalonia (Institut Català d’Investigació Química, ICIQ) on May 9-10, 2017. This congress, jointly organized by the Spanish CO2 Technology Platform (PTECO2) and the Spanish Technology Platform for Sustainable Chemistry (SusChem-Spain), is aimed at all agents of the science-technology-enterprise system. This technical forum also wants to offer a global vision of the different aspects involved in the technologies of Transformation and Utilization of Carbon Dioxide: from R&D to market applications.
SECURITY AND HEALTH
Importance of the operational control for occupational health and safety based on the standard OHSAS18001:2007
This article highlights the importance to consider and to evaluate the operational control for occupational health and safety based on the standard OHSAS18001:2007 in a company which elaborates ready mix concrete. To evaluate the current situation of the company was made an analysis based on a risk assessment and hazard identification in order to establish the control measures that are required to satisfy the legal requirements
applicable in Ecuador. After the assessment it was designed a guideline with the control measures for occupational health and safety to ensure the safety of all levels of the company.
Emergency due to walk area fall and bad railway track settlement of the bridge located in km 389/960 of the train line Venta de Baños-Santander
On 20 June 2016, the loss of the walks areas on the left side of the platform was detected. The structure has damage from poor durability; existence of mosses and lichens on the entire surface of the bridge (especially in the area of the cantilever); existence of efflorescences (due to the crystallization of the salts coming from the interior in several points of the bridge); corroded steel; as well as chippings and longitudinal fi ssures on the surface of the concrete.
Based on these characteristics and observed damages, a study and proposal for emergency action was prepared, in order to provide a stability solution to the railway platform. A solution that minimizes the incidence in the railway traffic, has as maximum durability as possible and requires the least maintenance task, and at the same time, that has as minimum period of execution as possible.
It is proposed to execute a continuous concrete slab resting on the tympanums of the existing structure, once the necessary demolitions are made and the current railway tracks removed. The works began on 29 June 2016 and ended on 23 September 2016.