mix design procedure for recycled aggregate concrete - sciencedirect
Conservation of natural resources and preservation of environment is the essence of any development. Use of recycled aggregate concrete (RAC) is one such attempt and is an answer to some of the problems in constructional engineering. The concept of using RAC is now gaining popularity and research in this direction has gained momentum. In this paper, the authors have identified the most suitable method of mix design for RAC, from amongst the available conventional methods of mix design. An influencing parameter is identified and an empirical relation is suggested to modify the influencing parameter. Mix design parameters thus obtained, enable RAC to attain the desired and designed target strength without attempting any trial mixes. The suggested modified procedure, however, demands 10% more cement which is considered quite reasonable and acceptable in view of the inferior quality of recycled aggregate.
materials | free full-text | concrete mix design for completely recycled fine aggregate by modified packing density method | html
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new mix design method for recycled concrete using mixed source concrete coarse aggregate | springerlink
This study proposes a new mix design methodfor C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be pre-wetted before casting. Its weighted mean strength has a value of 43.1MPa for two strengths of SC. Compressive and splitting tensile strength tests on recycled concrete with CRCA (100% substituting limestone aggregate) made from two mixed SC with varying strengths, have been implemented to acquire the mix design method. For investigating the influence of CRCA from two strengths of SC on recycled concrete performance, test parameters of mechanical behavior including compressive strength of SC, strength difference between two mixes of SC, and proportion of two mixed CRCA were taken into account. Test results indicate that when one of the two mixed SC strengths is similar to the target strength, two requirements have to be satisfied to achieve the target compressive strength: one of the SC has to be more than 10MPa higher than the target strength, and the proportion of the higher strength SC is larger than 75% in weight of the total CRCA. The results provide useful information for recycling multiple strength SC.
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This study was supported by the financial support from the National Intensive Research Project of China (No. 2018YFD1100402-05)andthe National Natural Science Foundation of China(No. 51908122). The financial support is gratefully appreciated.
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mix design and recycled aggregates effects on the concretes properties | springerlink
An experimental program was carried out to study the properties of concretes with C25/30 and C35/45 resistance classes designed using natural aggregates and recycled ones provided from construction and demolition waste (C&DW). Eight mixtures were prepared with different incorporation ratios of fine and coarse recycled aggregates. The physical and mechanical characteristics were measured and their evolution regarding to the paste volume, the equivalent replacement ratio and the quality of the interface between recycled aggregates and new paste has been investigated. Scanning Electron Microscopic observations have revealed a good quality of the interface. It was found that water porosity is more dependent on the equivalent replacement ratio than on the volume of the new paste. The same conclusions are reported for the electrical resistivity which has been related to the water porosity. Based on experimental results, it has been found that the Archies law predicts the electrical resistivity as a function of water porosity for all type of concrete. The effect of mix design parameters and aggregates properties on the compressive strength has been investigated and a model is proposed on the basis of Frets expression through experimental results and data points available in the literature. The modified expression is related to the aggregate fragmentation resistance expressed by the Los Angeles coefficient (LA). The Frets coefficient can be taken equal to 6.4 if LA20% and it is inversely proportional to LA otherwise. With regard to the splitting tensile strength, it can be correlated to the electrical resistivity through a power law relationship. The elastic modulus, the peak and the ultimate strains are than rewritten as functions of the compressive strength and the replacement ratio to model the full stressstrain curve under uniaxial compression. Furthermore, the validity of using EC2 to model the evolution of all mechanical properties with age is ensured.
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