The effect of superplasticizers on the mechanical performance of concrete made with fine recycled concrete aggregates

Abstract It is considered that using crushed recycled concrete as aggregate for concrete production is a viable alternative to dumping and would help to conserve abiotic resources. This use has fundamentally been based on the coarse fraction because the fine fraction is likely to degrade the performance of the resulting concrete. This paper presents results from a research work undertaken at Instituto Superior Tecnico (IST), Lisbon, Portugal, in which the effects of incorporating two types of superplasticizer on the mechanical performance of concrete containing fine recycled aggregate were evaluated. The purpose was to see if the addition of superplasticizer would offset the detrimental effects associated with the use of fine recycled concrete aggregate. The experimental programme is described and the results of tests for splitting tensile strength, modulus of elasticity and abrasion resistance are presented. The relative performance of concrete made with recycled aggregate was found to decrease. However, the same concrete with admixtures in general exhibited a better mechanical performance than the reference mixes without admixtures or with a less active superplasticizer. Therefore, it is argued that the mechanical performance of concrete made with fine recycled concrete aggregates can be as good as that of conventional concrete, if superplasticizers are used to reduce the water–cement ratio of the former concrete.

[1]  Jorge de Brito,et al.  Concrete Made with Coarse Concrete Aggregate: Influence of Curing on Durability , 2012 .

[2]  A. Neville.  Properties of Concrete , 1968 .

[3]  Valeria Corinaldesi,et al.  Influence of mineral additions on the performance of 100% recycled aggregate concrete , 2009 .

[4]  J. Brito,et al.  Mechanical properties of concrete produced with recycled coarse aggregates – Influence of the use of superplasticizers , 2013 .

[5]  J. de Brito,et al.  Durability performance of concrete made with fine recycled concrete aggregates , 2010 .

[6]  T. Hansen.  Recycling of Demolished Concrete and Masonry , 1992 .

[7]  Takafumi Noguchi,et al.  RELATIONSHIP BETWEEN COMPRESSIVE STRENGTH AND MODULUS OF ELASTICITY OF HIGH STRENGTH CONCRETE , 1995 .

[8]  J. de Brito,et al.  The influence of curing conditions on the mechanical performance of concrete made with recycled concrete waste , 2011 .

[9]  K. Sagoe-Crentsil,et al.  Performance of concrete made with commercially produced coarse recycled concrete aggregate , 2001 .

[10]  J. Khatib,et al.  Properties of concrete incorporating fine recycled aggregate , 2005 .

[11]  C. Poon,et al.  Comparisons of natural and recycled aggregate concretes prepared with the addition of different mineral admixtures , 2011 .

[12]  Chi Sun Poon,et al.  Properties of concrete prepared with crushed fine stone, furnace bottom ash and fine recycled aggregate as fine aggregates , 2009 .

[13]  Tony C. Y. Liu,et al.  Abrasion Resistance of Concrete , 1981 .

[14]  Amnon Katz,et al.  Treatments for the Improvement of Recycled Aggregate , 2004 .

[15]  S. Popovics.  Strength and Related Properties of Concrete: A Quantitative Approach , 1998 .

[16]  C. Poon,et al.  Properties of self-compacting concrete prepared with coarse and fine recycled concrete aggregates , 2009 .

[17]  I. Despotovic,et al.  Properties of self-compacting concrete prepared with coarse recycled concrete aggregate , 2010 .

[18]  J. M. Raphael.  Tensile Strength of Concrete , 1984 .

[19]  P. J. Nixon,et al.  Recycled concrete as an aggregate for concrete—a review , 1978 .

[20]  Mahmoud Solyman,et al.  Classification of recycled sands and their applications as fine aggregates for concrete and bituminous mixtures , 2005 .

[21]  F. T. Olorunsogo,et al.  Performance of recycled aggregate concrete monitored by durability indexes , 2002 .

[22]  Muhammad Fauzi Mohd. Zain,et al.  Prediction of splitting tensile strength of high-performance concrete , 2002 .

[23]  E. Horszczaruk.  Abrasion resistance of high-strength concrete in hydraulic structures , 2005 .

[24]  J. Brito,et al.  The effect of superplasticisers on the workability and compressive strength of concrete made with fine recycled concrete aggregates , 2012 .

[25]  Y. N. Chan,et al.  Near-surface characteristics of concrete: abrasion resistance , 1991 .

[26]  Valeria Corinaldesi,et al.  Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates , 2010 .

[27]  Andrzej Ajdukiewicz,et al.  Influence of recycled aggregates on mechanical properties of HS/HPC , 2002 .

[28]  J. Brito,et al.  Durability of Concrete with Recycled Coarse Aggregates: Influence of Superplasticizers , 2014 .

[29]  P. K. Mehta,et al.  Concrete: Microstructure, Properties, and Materials , 2005 .

[30]  K. Rahal.  Mechanical properties of concrete with recycled coarse aggregate , 2007 .

[31]  Jorge de Brito,et al.  Concrete with recycled aggregates: the Portuguese experimental research , 2010 .

[32]  Eric Wirquin,et al.  Assessment of the Surface Permeation Properties of Recycled Aggregate Concrete , 2003 .

[33]  J. Brito,et al.  Mechanical behaviour of concrete made with fine recycled concrete aggregates , 2007 .