scholarly journals Improvement of the durability of concrete with recycled aggregates in chloride exposed environment

2014 ◽  
Vol 67 ◽  
pp. 61-67 ◽  
Author(s):  
Enric Vázquez ◽  
Marilda Barra ◽  
Diego Aponte ◽  
Cristian Jiménez ◽  
Susanna Valls
Keyword(s):  
Recycled Aggregates ◽  
Durability Of Concrete

scholarly journals Effects of Recycled Aggregate on Concrete Mix and Exposure to Chloride

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Ammar Ben Nakhi ◽  
Jasem M. Alhumoud
Keyword(s):  
Sea Water ◽  
Chloride Concentration ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Chloride Diffusion ◽  
Demolition Waste ◽  
Aggregate Content ◽  
Concrete Mix ◽  
Durability Of Concrete

Construction and demolition waste has dramatically increased in the last decade, and most of it goes into landfills, increasing the burden on landfill loading and operations. Recycling of concrete is needed from the viewpoints of environmental preservation and effective utilization of resources. Regarding the durability of concrete, chloride diffusion, which is one parameter that reflects the durability of concrete, is tested in this study. Concrete made with different percentages of recycled aggregate (0%–100%, with increments of 10%) is investigated using mechanical and nondestructive testing of mixes consisting of two aggregate particle sizes (1/2″ and 3/8″). In addition, we studied the chloride diffusion of saturated concrete made with different percentages of recycled aggregate. The samples were exposed to sea water with 3% chloride concentration and tested after 2 and 4 weeks of exposure. The results indicate that the density and air content of new concrete decreased with an increase in recycled aggregates content. Compressive strength decreased with the increase in the recycled aggregate content, and a concrete mix with 40% recycled aggregate exhibited the best strength. Concrete mix with 30% recycled aggregate had the lowest chloride penetration after 2 weeks of saturation and performed better than a concrete mix with 100% natural aggregate. Owing to the lower density and higher water absorption of recycled aggregates, chloride ion diffusion increased with increasing recycled aggregate content beyond 2 weeks.

scholarly journals Durability of concrete mixed with fine recycled aggregates DOI: 10.5585/exacta.v5i1.1027

Exacta ◽  
2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Salomon Levy ◽  
Paulo Helène
Keyword(s):  
Water Absorption ◽  
Pore Volume ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Carbonation Depth ◽  
Physical Chemical ◽  
Family Behavior ◽  
Recycled Masonry ◽  
Durability Of Concrete

In this paper, an analysis was conducted on the influence of the use of 20%, 50% and 100% contents of two types of fine recycled aggregates (from demolish concrete and from old masonry) on the following properties of concrete: water absorption by immersion, pore volume, carbonation and resistivity. This analysis was not restricted to compare mixtures from a table of results. All the analysis was based on concrete family behavior. The Mix Design Nomograms (MDN) was made for concrete families: one as reference and six others with different recycled contents to replace the natural fine aggregate. The MDN obtained for the properties studied permitted compare class 20MPa, 30MPa and 40MPa concretes. The results obtained indicate that the carbonation depth reached a minimum and the resistivity reached a maximum when 50% contents of fine recycled masonry aggregates were used. However, this tendency was not repeated for pore volume and water absorption. Thus, it should conclude that the durability like a carbonation and resistivity are physical-chemical phenomena that, in this case, were inversely related to water absorption and volume of pores.

scholarly journals Durability of concrete mixed with fine recycled aggregates

Exacta ◽  
2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Salomon Levy ◽  
Paulo Helène
Keyword(s):  
Water Absorption ◽  
Pore Volume ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Carbonation Depth ◽  
Physical Chemical ◽  
Family Behavior ◽  
Recycled Masonry ◽  
Durability Of Concrete

In this paper, an analysis was conducted on the influence of the use of 20%, 50% and 100% contents of two types of fine recycled aggregates (from demolish concrete and from old masonry) on the following properties of concrete: water absorption by immersion, pore volume, carbonation and resistivity. This analysis was not restricted to compare mixtures from a table of results. All the analysis was based on concrete family behavior. The Mix Design Nomograms (MDN) was made for concrete families: one as reference and six others with different recycled contents to replace the natural fine aggregate. The MDN obtained for the properties studied permitted compare class 20MPa, 30MPa and 40MPa concretes. The results obtained indicate that the carbonation depth reached a minimum and the resistivity reached a maximum when 50% contents of fine recycled masonry aggregates were used. However, this tendency was not repeated for pore volume and water absorption. Thus, it should conclude that the durability like a carbonation and resistivity are physical-chemical phenomena that, in this case, were inversely related to water absorption and volume of pores.

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