Coal bottom ash studies as a new cement constituent

Menéndez, E. and Argiz Lucio, Cristina Gema and Moragues Terrades, Amparo and Sanjuan Barbudo, Miguel Angel (2015). Coal bottom ash studies as a new cement constituent. In: "14th International Congress on the Chemistry of Cement (ICCC 2015)", 13/10/2015 – 16/10/2015, Pekín, China. pp. 1-7.

Description

Title: Coal bottom ash studies as a new cement constituent
Author/s:
  • Menéndez, E.
  • Argiz Lucio, Cristina Gema
  • Moragues Terrades, Amparo
  • Sanjuan Barbudo, Miguel Angel
Item Type: Presentation at Congress or Conference (Article)
Event Title: 14th International Congress on the Chemistry of Cement (ICCC 2015)
Event Dates: 13/10/2015 – 16/10/2015
Event Location: Pekín, China
Title of Book: Proceedings of the 14th International Congress on the Chemistry of Cement
Date: 2015
Subjects:
Freetext Keywords: Coal bottom ash; cement constituent; carbonation; pozzolanicity; durability
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Construcción
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Future cements will require new constituents in order to become a more sustainable construction product. Therefore, the durability of the cements made with them must be checked. In this respect, coal bottom ash is proposed as a new Portland cement constituent and thus chemical durability as well as mechanical strength have been tested in mortar and concrete to evaluate its capability to be an adequate cement constituent. Coal bottom ash is tested in mortars made of mixes of coal combustion bottom and fly ashes. The results are compared to those performed in mortars made of CEM I 42.5 N (EN 197-1:2011). These bottom ash-fly ash mixes are incorporated in the common Portland cement in the needed proportions to produce CEM II/A-V, CEM II/B-V and CEM IV/A (V) cements according to the European standard EN 197-1:2011. Natural carbonation is the only durable property considered in the present work. Blended cements perform well with regard to the chloride diffusion. On the contrary, the higher amount of ashes, the deeper carbonation fronts regardless of the type of ash, bottom ash, fly ash or mixes of them. This effect could be explained because the bottom ash has a content of Fe2O3, TiO2, P2O5, SrO2 and so on, quite similar to that of the fly ash. The presence of such oxides might have a significant effect on pore solution concentration and then it is expected that they will play a significant role in the cement properties related to mortar and concrete durability. Summing up, it is possible to say that the utilization of bottom ash, in comparison to fly ash, does not modify the compressive strength, carbonation resistance and pozzolanicity characteristics of the mortars studied in the present work. The final result invites to propose the use of this new cement constituent for some applications in the appropriate cement standard

More information

Item ID: 42134
DC Identifier: http://oa.upm.es/42134/
OAI Identifier: oai:oa.upm.es:42134
Official URL: http://iccc2015.csp.escience.cn/dct/page/1
Deposited by: Memoria Investigacion
Deposited on: 29 Jun 2016 17:32
Last Modified: 29 Jun 2016 17:32
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