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Research paper thumbnail of Durability of recycled aggregate concrete designed with equivalent mortar volume method

Cement and Concrete Composites, 2009

Results of a comprehensive investigation about the durability of structural-grade concrete made w... more Results of a comprehensive investigation about the durability of structural-grade concrete made with recycled concrete aggregate (RCA) are presented. The RCA-concrete mixes were proportioned using a new concrete mix design method, termed the equivalent mortar volume (EMV) ...

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Research paper thumbnail of Rheology of fresh concretes with recycled aggregates

Construction and Building Materials, 2014

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Research paper thumbnail of Equivalent Mortar Volume (EMV) method for proportioning recycled aggregate concrete: Validation under the Spanish context and its adaptation to Bolomey methodology for concrete proportioning

Materiales de Construcción, 2012

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Research paper thumbnail of Improvement of the durability of concrete with recycled aggregates in chloride exposed environment

Construction and Building Materials, 2014

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Research paper thumbnail of LCA of recycled and conventional concretes designed using the Equivalent Mortar Volume and classic methods

Construction and Building Materials, 2015

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Research paper thumbnail of Rheology of fresh concretes with recycled aggregates

The most frequently used measure of rheology is the slump test, which evaluates workability. Sinc... more The most frequently used measure of rheology is the slump test, which evaluates workability. Since this value is often operator-sensitive, a more quantitative estimate can be derived in terms of fundamental physical quantities, such as plastic viscosity and yield stress. The higher heterogeneity in terms of experimental slump measure occurs when recycled aggregate concrete (RAC) is tested. In this work, 16 recycled mixes were analysed with two aggregates proportioning methods and results were compared with four controls: rheological parameters were measured with a ConTec BML Viscometer 3. The results represent a valid tool for better understanding of fresh RAC rheology.

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Research paper thumbnail of Improvement of the durability of concrete with recycled aggregates in chloride exposed environment

Recycled aggregates concrete (RAC) becomes an important participant in recycled materials althoug... more Recycled aggregates concrete (RAC) becomes an important participant in recycled materials although there are still questionable properties of it, like chloride penetration and diffusion. An extensive experimental campaign was performed in order to evaluate the effect of recycled concrete aggregates (RCA) over some properties of concretes. Composition and mix design influence on the concrete were studied in mixes ranging from 0.45 to 0.60 w/c ratios, with 0%, 20%, 50% and 100% coarse aggregates replacement. Concretes were submitted to saline attack and the total chloride contents were determined as well as the chloride penetration profiles. Both new cement paste and RCA from different concrete mixes were analysed by XRD and SEM in order to evaluate the chlorides binding. A chloride binding phenomenon is detected in RAC which may compensate the RCA higher permeability. According to chloride diffusion results, high RCA content lead to an improvement of durability in RAC with sufficiently low w/c ratio, in terms of chlorides presence.

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Research paper thumbnail of LCA of recycled and conventional concretes designed using the Equivalent Mortar Volume and classic methods

The objective of this investigation is to environmentally evaluate three concrete design methods ... more The objective of this investigation is to environmentally evaluate three concrete design methods through a Life Cycle Assessment using the methodology of the Institute of Environmental Sciences (CML), from Leiden University, one of the most commonly applied in practice. Included is a novel method for designing recycled aggregate concretes, named Equivalent Mortar Volume. The evaluation is done by comparing certain key life cycle stages of four concretes, two designed through the proposed method and two others designed through widely known methods. These experimentally assessed concretes have equal sets of properties in terms of mechanical resistance, durability, and workability. According to the calculated emission quantities, concretes designed using the novel method show better environmental performance than their counterparts in all of the selected impact categories.

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Research paper thumbnail of Equivalent Mortar Volume (EMV) method for proportioning recycled aggregate concrete: Validation under the Spanish context and its adaptation to Bolomey methodology for concrete proportioning

A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibilit... more A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibility under the Spanish context. First, an extensive experimental campaign has been done, with the purpose of check and analyze the applicability of the EMV method with two Spanish recycled concrete aggregates (RCA). The aim of the second part of the investigation, was to elaborate an adaptation of the EMV method to Bolomey methodology (1), using a 20% weight replacement of coarse natural aggregates (NA) for RCA, and so, with this, comply with the Spanish Instruction for Structural Concrete (EHE 2008). Slump, air content, fresh and hardened densities, compressive strength and modulus of elasticity were determined and analyzed, in order to check the concrete properties. Finally, it was observed that, the EMV method is viable, and its adaptation, results in concrete mixes with similar or better properties than the natural aggregate concrete and RAC conventionally prepared.

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Research paper thumbnail of Durability of recycled aggregate concrete designed with the Equivalent Mortar Volume (EMV) method: Validation under the Spanish context and its adaptation to Bolomey methodology

Some durability properties are analyzed in concretes made with a novel method for recycled aggreg... more Some durability properties are analyzed in concretes made with a novel method for recycled aggregates concrete (RAC) proportioning, in order to validate it under the Spanish context. Two types of concrete mixes were elaborated; one following the guidelines of the named method, and other based on an adaptation of the method to Bolomey methodology. Two types of recycled concrete aggregates (RCA) were used. RCA replacement for natural aggregates (NA) ranged from 20% to 100%. The 20% was chosen in order to comply with Spanish recommendations. Water penetration under pressure, water absorption and chlorides attack were the studied properties. It is verified that the new method and the developed adaptation results in concrete mixes of better or similar properties to those of the natural aggregates concrete (NAC) and the conventional RAC, saving important amounts of cement.

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Research paper thumbnail of Durability of recycled aggregate concrete designed with equivalent mortar volume method

Cement and Concrete Composites, 2009

Results of a comprehensive investigation about the durability of structural-grade concrete made w... more Results of a comprehensive investigation about the durability of structural-grade concrete made with recycled concrete aggregate (RCA) are presented. The RCA-concrete mixes were proportioned using a new concrete mix design method, termed the equivalent mortar volume (EMV) ...

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Research paper thumbnail of Rheology of fresh concretes with recycled aggregates

Construction and Building Materials, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Equivalent Mortar Volume (EMV) method for proportioning recycled aggregate concrete: Validation under the Spanish context and its adaptation to Bolomey methodology for concrete proportioning

Materiales de Construcción, 2012

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Research paper thumbnail of Improvement of the durability of concrete with recycled aggregates in chloride exposed environment

Construction and Building Materials, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of LCA of recycled and conventional concretes designed using the Equivalent Mortar Volume and classic methods

Construction and Building Materials, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rheology of fresh concretes with recycled aggregates

The most frequently used measure of rheology is the slump test, which evaluates workability. Sinc... more The most frequently used measure of rheology is the slump test, which evaluates workability. Since this value is often operator-sensitive, a more quantitative estimate can be derived in terms of fundamental physical quantities, such as plastic viscosity and yield stress. The higher heterogeneity in terms of experimental slump measure occurs when recycled aggregate concrete (RAC) is tested. In this work, 16 recycled mixes were analysed with two aggregates proportioning methods and results were compared with four controls: rheological parameters were measured with a ConTec BML Viscometer 3. The results represent a valid tool for better understanding of fresh RAC rheology.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improvement of the durability of concrete with recycled aggregates in chloride exposed environment

Recycled aggregates concrete (RAC) becomes an important participant in recycled materials althoug... more Recycled aggregates concrete (RAC) becomes an important participant in recycled materials although there are still questionable properties of it, like chloride penetration and diffusion. An extensive experimental campaign was performed in order to evaluate the effect of recycled concrete aggregates (RCA) over some properties of concretes. Composition and mix design influence on the concrete were studied in mixes ranging from 0.45 to 0.60 w/c ratios, with 0%, 20%, 50% and 100% coarse aggregates replacement. Concretes were submitted to saline attack and the total chloride contents were determined as well as the chloride penetration profiles. Both new cement paste and RCA from different concrete mixes were analysed by XRD and SEM in order to evaluate the chlorides binding. A chloride binding phenomenon is detected in RAC which may compensate the RCA higher permeability. According to chloride diffusion results, high RCA content lead to an improvement of durability in RAC with sufficiently low w/c ratio, in terms of chlorides presence.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of LCA of recycled and conventional concretes designed using the Equivalent Mortar Volume and classic methods

The objective of this investigation is to environmentally evaluate three concrete design methods ... more The objective of this investigation is to environmentally evaluate three concrete design methods through a Life Cycle Assessment using the methodology of the Institute of Environmental Sciences (CML), from Leiden University, one of the most commonly applied in practice. Included is a novel method for designing recycled aggregate concretes, named Equivalent Mortar Volume. The evaluation is done by comparing certain key life cycle stages of four concretes, two designed through the proposed method and two others designed through widely known methods. These experimentally assessed concretes have equal sets of properties in terms of mechanical resistance, durability, and workability. According to the calculated emission quantities, concretes designed using the novel method show better environmental performance than their counterparts in all of the selected impact categories.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Equivalent Mortar Volume (EMV) method for proportioning recycled aggregate concrete: Validation under the Spanish context and its adaptation to Bolomey methodology for concrete proportioning

A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibilit... more A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibility under the Spanish context. First, an extensive experimental campaign has been done, with the purpose of check and analyze the applicability of the EMV method with two Spanish recycled concrete aggregates (RCA). The aim of the second part of the investigation, was to elaborate an adaptation of the EMV method to Bolomey methodology (1), using a 20% weight replacement of coarse natural aggregates (NA) for RCA, and so, with this, comply with the Spanish Instruction for Structural Concrete (EHE 2008). Slump, air content, fresh and hardened densities, compressive strength and modulus of elasticity were determined and analyzed, in order to check the concrete properties. Finally, it was observed that, the EMV method is viable, and its adaptation, results in concrete mixes with similar or better properties than the natural aggregate concrete and RAC conventionally prepared.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Durability of recycled aggregate concrete designed with the Equivalent Mortar Volume (EMV) method: Validation under the Spanish context and its adaptation to Bolomey methodology

Some durability properties are analyzed in concretes made with a novel method for recycled aggreg... more Some durability properties are analyzed in concretes made with a novel method for recycled aggregates concrete (RAC) proportioning, in order to validate it under the Spanish context. Two types of concrete mixes were elaborated; one following the guidelines of the named method, and other based on an adaptation of the method to Bolomey methodology. Two types of recycled concrete aggregates (RCA) were used. RCA replacement for natural aggregates (NA) ranged from 20% to 100%. The 20% was chosen in order to comply with Spanish recommendations. Water penetration under pressure, water absorption and chlorides attack were the studied properties. It is verified that the new method and the developed adaptation results in concrete mixes of better or similar properties to those of the natural aggregates concrete (NAC) and the conventional RAC, saving important amounts of cement.

Bookmarks Related papers MentionsView impact