Corrosion Behavior of Steel Reinforcement in Concrete with Recycled Aggregates, Fly Ash and Spent Cracking Catalyst

Materials

Hebé Gurdián¹  Eva Garc໚-Alcocel²  Francisco Baeza-Brotons¹  Pedro Garcés¹ 

[1] Civil Engineering Deparment, Universidad de Alicante, Ctra. San Vicente s/n, San Vicente del Raspeig 03690, Spain; E-Mails:;Architectural Constructions Department, Universidad de Alicante, Ctra. San Vicente s/n, San Vicente del Raspeig 03690, Spain; E-Mail:

关键词: recycled aggregate;    spent catalytic cracking catalyst;    fly ash;    concrete;    corrosion;    mechanical properties;   

DOI  :  10.3390/ma7043176

来源: mdpi

【 摘 要 】

The main strategy to reduce the environmental impact of the concrete industry is to reuse the waste materials. This research has considered the combination of cement replacement by industrial by-products, and natural coarse aggregate substitution by recycled aggregate. The aim is to evaluate the behavior of concretes with a reduced impact on the environment by replacing a 50% of cement by industrial by-products (15% of spent fluid catalytic cracking catalyst and 35% of fly ash) and a 100% of natural coarse aggregate by recycled aggregate. The concretes prepared according to these considerations have been tested in terms of mechanical strengths and the protection offered against steel reinforcement corrosion under carbonation attack and chloride-contaminated environments. The proposed concrete combinations reduced the mechanical performance of concretes in terms of elastic modulus, compressive strength, and flexural strength. In addition, an increase in open porosity due to the presence of recycled aggregate was observed, which is coherent with the changes observed in mechanical tests. Regarding corrosion tests, no significant differences were observed in the case of the resistance of these types of concretes under a natural chloride attack. In the case of carbonation attack, although all concretes did not stand the highly aggressive conditions, those concretes with cement replacement behaved worse than Portland cement concretes.

【 授权许可】

CC BY   
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