Instituto Espanol del Cemento y sus Aplicaciones IECA

Madrid, Spain

Instituto Espanol del Cemento y sus Aplicaciones IECA

Madrid, Spain

Time filter

Source Type

Sanjuan M.A.,Instituto Espanol del Cemento y sus Aplicaciones IECA | Pineiro A.,Instituto Espanol del Cemento y sus Aplicaciones IECA | Rodriguez O.,CSIC - National Center for Metallurgical Research
Materiales de Construccion | Year: 2011

Recently, a k-value for ground granulated blast-furnace slag or k-value has been added to the revision of the European standard EN 206-1:2000. The proposed values during the disscusion in the working groups were very different because in most of cases the compressive strength was the only characteristic considered; while only in few cases the concrete durability was taken into account when ground granulated blast-furnace slag is added directly to the mix. Advantages and disadvantages of the k-values found in the literature are discussed in this paper. The final conclusion may be summarised suggesting a logical proposal of addressing to each country the choice of the k-value in function of the concrete application, environment and placing conditions selected according to their own experience.


Argiz C.,CSIC - Eduardo Torroja Institute for Construction Science | Argiz C.,Technical University of Madrid | Menendez E.,CSIC - Eduardo Torroja Institute for Construction Science | Sanjuan M.A.,Instituto Espanol del Cemento y sus Aplicaciones IECA
Materiales de Construccion | Year: 2013

New additions to the cement are needed to achieve a more sustainable and durable construction material. Within this context, bottom ashes can be used as a main constituent of Portland cements when it is mixed in an optimized proportion with fly ashes. The mechanical characteristics of standarized mortars made of mixes of pulverized coal combustion bottom and fly ashes are studied. The mortars were made of ordinary Portland cement (CEM I 42.5 N) and mixes of bottom ashes with fly ashes in similar proportions to those of CEM II/A-V, CEM II/B-V and CEM IV/A (V). Summing up, it can be said that the utilization of bottom ashes mixed with fly ashes in replacement levels from 0% to 100% do not affect significantively on the mechanical caracteristics of the mortars considered in the present study which had an addition maximum content of 35%.


Sanjuan M.A.,Instituto Espanol Del Cemento y Sus Aplicaciones IECA | Argiz C.,Technical University of Madrid | Galvez J.C.,Technical University of Madrid | Moragues A.,Technical University of Madrid
Construction and Building Materials | Year: 2015

This paper presents both a study on the effect of silica fume (SF) fineness on the pozzolanicity of blended cement and a method for improving coarse SF performance in making high-strength and high-performance concrete. The coarse SF, having a 45 μm sieve residue of 32.11%, yields a low pozzolanic reaction. In order to enhance its quality, the coarse SF was ground until the average particle size was reduced to a 45 μm sieve residue of 4.13% and 0.98%. It was then mixed with Portland cement type CEM I 52.5 N-SR 3 by a weight of 25% to determine the strength activity index for it to be used to produce high-performance concrete. The pozzolanic reaction and quantitative influence of SF fineness on the mechanical strength in the SF containing composite cement system were examined in detail. XRF results indicated that reactive SiO2 content has a clear influence on pozzolanic performance, though not as important as the SF grain size. Several methods, including the pozzolanicity test (EN 196-5:2011), chemical analysis (XRF) and strength activity index techniques, were used comprehensively for evaluation of the SF containing composite cement system. The results suggest that the SF with high fineness is suitable for use in making CEM II/A-D cement in percentages of SF lower than 10%, according to the European Standard EN 197-1:2011 in producing a good quality, high-strength and high-performance concrete. © 2015 Elsevier Ltd. All rights reserved.


Ortiz S.C.,Instituto Espanol del Cemento y sus Aplicaciones IECA
Carreteras | Year: 2012

This article deals with the principal aspects that affect sustainability in concrete surfacing. These are environmental aspects relating to durability, Life-Cycle Assessment (LCA), savings in volume of materials and light and energy reflectance. Social aspects are analysed relative to safety in driving and safety of the occupants in case of fire in tunnels, a reduction in user inconvenience caused by the maintenance and reinforcement of road surfaces, to savings in the fuel used by travelling vehicles and the new surface finishes for concrete surfacing that equal the roll smoothness and noise abatement convenience of bitumen-mix solutions. Lastly, and to complete the third aspect of sustainability, it evaluates economic aspects from the viewpoint of Life-Cycle Cost Analysis (LCCA), savings in road surface lighting in urban areas and tunnels and its low dependence on the price of oil.


Sanjuan M.A.,Instituto Espanol del Cemento y sus Aplicaciones IECA | Argiz C.,Technical University of Madrid
Materiales de Construccion | Year: 2012

In this paper, the novelties of European standard EN 197-1:2011 which has been aprobed on 6th August, 2011 are presented. The european standard EN 197-1:2011 has been published in the Official Journal of the European Union on 19th June, 2012 (C 176/1). The UNEEN 197-1:2011 will be published in Spain in the Official Journal of Spain (B.O.E.). The date of applicability (DAV) of the standard as a harmonised European standard is on 1st of July, 2012 and the date of the end of the coexistence period is on 1st of July, 2013. The former EN 197-1:2000 has been the first European standard in the field of the Construction Products Directive (CPD) and this first revision include the requirements needed for a common cement to be, in addition, sulphate resisting cement. Therefore, the mandate given by the European Commission to CEN to prepare harmonised standards in the cement field (mandate M114) has been fulfilled.


Argiz C.,CSIC - Eduardo Torroja Institute for Construction Science | Menendez E.,CSIC - Eduardo Torroja Institute for Construction Science | Sanjuan M.A.,Instituto Espanol del Cemento y sus Aplicaciones IECA
Concrete Repair, Rehabilitation and Retrofitting III - Proceedings of the 3rd International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR 2012 | Year: 2012

Durability in cold environments of mortars made of ordinary Portland cement, bottom ash and pulverized fuel fly ashes obtained from a coal electrical power stations in Spain have been investigated. This paper presents the experimental investigations carried out to study the effect of use of bottom ash (the coarser material, which falls into furnace bottom in modern large thermal power plants and constitute about 10-15% of total ash content of the coal fed in the boilers) as a replacement of fly ash. The performance of both fly and bottom ashes was investigated in terms of the hydration characteristics and microstructure, when exposed to cold environments. The following compositions were considered: Cement + (fly ash + bottom ash) replacement level up to 35%. The (fly ash + bottom ash) consisted of a bottom ash replacement of 50 and 100% of fly ash in the ashes mix. Use of fly ash beyond 35 percent is allowed in Europe, but the use of bottom ash is presently not permitted as pozzolanic addition in cement nor concrete. The use of coal bottom ash in Portland cement is a new dimension in pozzolanic repairing mortars cement and if applied in standarized Portland cement would revolutionize the cement industry, by economizing the production cost and decreasing the ash content. From the results, the use of bottom ash up to 15 percent as pozzolanic addition in cement repairing mortars is strongly recommended. © 2012 Taylor & Francis Group.


Argiz C.,CSIC - Eduardo Torroja Institute for Construction Science | Argiz C.,Technical University of Madrid | Sanjuan M.A.,Instituto Espanol del Cemento y Sus Aplicaciones IECA | Munoz-Martialay R.,CSIC - Eduardo Torroja Institute for Construction Science
Materiales de Construccion | Year: 2014

Great durability problems are being found in concrete structures related to the penetrability of aggressive agents through the concrete (ie. chloride penetration, sulphate attack, carbonation, freezing and thawing, and so on). Air permeability coefficient is used as an effective tool to estimate the potential durability of concrete structures due to its direct relation with the microstructure and the moisture content. This paper discusses the effect of the aggregate grading and water/cement ratio on the air permeability coefficient. An aggregate grading with more sand than coarse aggregates has resulted more beneficial from the point of view of concrete air permeability. This fact can be attributed to a denser skeleton formed by the finer aggregates. With fine aggregates, the higher water/cement ratio, the lower air permeability. However, the contrary was found with coarse aggregates. Overall, a temperature increase from 20 °C to 60 °C during preconditioning led to a Dair increase of 40-80%. © 2014 CSIC.

Loading Instituto Espanol del Cemento y sus Aplicaciones IECA collaborators
Loading Instituto Espanol del Cemento y sus Aplicaciones IECA collaborators