Chemical–mineralogical characterisation of coarse recycled concrete aggregate

2007 ◽  
Vol 27 (2) ◽  
pp. 201-208 ◽  
Author(s):  
M.C. Limbachiya ◽  
E. Marrocchino ◽  
A. Koulouris
Keyword(s):  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Coarse Recycled Concrete Aggregate

Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres

2020 ◽  
Vol 991 ◽  
pp. 101-108
Author(s):  
Sallehan Ismail ◽  
Mahyuddin Ramli
Keyword(s):  
Chloride Penetration ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Coupling Effects ◽  
Aggregate Concrete ◽  
Curing Regimes ◽  
Coarse Recycled Concrete Aggregate

This paper presents a study that aimed to assess the chloride penetration depth of recycled aggregate concrete (RAC) modified by using treated coarse recycled concrete aggregate (RCA), adding polyolefin (PO) or polypropylene (PP) fibre and comparing with normal concrete. The coupling effects of the treated RCA and fibres on the chloride penetration of RAC were analysed after two different curing regimes (i.e. normal and seawater) and tested at different curing ages (i.e. 90, 180 and 300 days). Results showed that the inclusion of treated coarse RCA can reduce porosity, thereby decreasing the chloride penetration of RAC. However, the coupling effects of treated coarse RCA and fibre, especially on the use of PO fibre, can enhance the results.

Properties of self-compacting concrete prepared with coarse recycled concrete aggregate

2010 ◽  
Vol 24 (7) ◽  
pp. 1129-1133 ◽  
Author(s):  
Zoran Jure Grdic ◽  
Gordana A. Toplicic-Curcic ◽  
Iva M. Despotovic ◽  
Nenad S. Ristic
Keyword(s):  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Self Compacting Concrete ◽  
Coarse Recycled Concrete Aggregate

scholarly journals Performance of Self Compacting Concrete Incorporating Coarse Recycled Concrete Aggregates Exposed to Sulphate Attack

2020 ◽  
Vol 8 (5) ◽  
pp. 4797-4806
Keyword(s):  
Sodium Sulphate ◽  
Recycled Concrete ◽  
Sulphate Solution ◽  
Strength Development ◽  
Natural Material ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Sulphate Attack ◽  
Self Compacting Concrete ◽  
Coarse Recycled Concrete Aggregate

The interpretation of the performance of self-compacting concrete made with distinct proportion of coarse recycled concrete aggregate (RCA) (0%, 25%, 50%, 75% and 100%) exposed to sodium sulphate solution (50 gram/litre) under fully immersion condition is studied in this paper. Compressive and tensile strength development/degradation, mass change and length change under sulphate attack was surveyed for all tested units. According to the results it can be conclude that the use of coarse recycled concrete aggregate does not affect the development of strength of concrete with respect to natural material mixtures. It also conclude that for producing of sustainable and green concrete, the quality of used coarse recycled concrete aggregate is an important factor. The differ proportion of coarse recycled concrete aggregate & duration of immersion of concrete in sulphate solution also affect the concrete properties. Reusing recycled combination has twin property benefits: benefiting many tons dismantled concrete worldwide and conserving natural aggregates.

scholarly journals Bricks and Concrete Wastes as Coarse and Fine Aggregates in Sustainable Mortars

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Alessandra Mobili ◽  
Chiara Giosuè ◽  
Valeria Corinaldesi ◽  
Francesca Tittarelli
Keyword(s):  
Crack Formation ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Concrete Aggregate ◽  
Capillary Absorption ◽  
Recycled Concrete Aggregate ◽  
Environment Friendly ◽  
Fine Aggregates ◽  
Natural Aggregates ◽  
Coarse Recycled Concrete Aggregate

The total substitution by volume of natural coarse calcareous aggregate by coarse recycled brick aggregate (RBA) and coarse recycled concrete aggregate (RCA) has been investigated to produce more sustainable and environment-friendly mortars. Aggregates were also partially substituted by their fines at 12.5% by volume. Mortars have been tested in terms of mechanical, microstructural, and durability properties. Results show that it is feasible to replace a natural calcareous aggregate entirely by recycled aggregates. In particular, the obtained mortars, even if more porous and more prone to the water capillary absorption than that manufactured with natural aggregates, result in less stiffness and thus are less subjected to crack formation, more permeable to water vapour, and less susceptible to sulphate attack.

Fuzzy Synthesis Method for Evaluating Quality Class of Coarse Recycled Concrete Aggregate

2011 ◽  
Vol 250-253 ◽  
pp. 783-787
Author(s):  
Ping Hua Zhu ◽  
Jin Cai Feng ◽  
Xin Jie Wang
Keyword(s):  
Present Method ◽  
Synthesis Method ◽  
Weighted Average ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Quality Class ◽  
Los Angeles Abrasion ◽  
Coarse Recycled Concrete Aggregate

It’s necessary evaluating for quality of coarse recycled concrete aggregate (CRA) before it is used as feasible alternative of natural coarse aggregate (NCA). The factors affecting the quality of CRA, however, being multitudinous and complicated so much, associated to regional characteristic of CRA, led to a research on evaluating quality of CRA from China. First, the CRA was partitioned into three fuzzy quality classes corresponded to high, middle, and poor, respectively, whose applicable environment action grades and projects in terms of quality classes were suggested. Second, a fuzzy synthesis method how to evaluate quality classes was proposed. The present method used six indices, i.e., attached mortar content, bulk specific density, water absorption, Los Angeles abrasion loss, chlorid content and sulfate content. The weights for six indices were obtained based on credibility matrix and frequency statistic and the memberships based on optimum-intervel-style membership function. Using fuzzy weighted average operator, judgment matrix was calculated and synthetic membership score was considered as quality class judgment standard. Last, large numbers of engineering examples were computed using a program compiled in Matlab language. Computing results show that the present method is objective and reliable.

Creep and drying shrinkage characteristics of concrete produced with coarse recycled concrete aggregate

2011 ◽  
Vol 33 (10) ◽  
pp. 1026-1037 ◽  
Author(s):  
Gholamreza Fathifazl ◽  
A. Ghani Razaqpur ◽  
O. Burkan Isgor ◽  
Abdelgadir Abbas ◽  
Benoit Fournier ◽  
...  
Keyword(s):  
Drying Shrinkage ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Coarse Recycled Concrete Aggregate
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