DADmax/NADmax Ratio: Criterion for the Production and Selection of Demolition Aggregates with Low-Water Absorption

Document Type : Regular Paper

Authors

Civil Engineering Research Laboratory, Department of Civil Engineering and Hydraulic, Faculty of Sciences and Technology, Mohamed KHIDER University, 07000 Biskra, P.O.B. 145 RP, Algeria

10.22075/jrce.2024.31002.1870

Abstract

The use of demolition aggregates (DAs) in second-generation concretes is an important issue, as they often have high water absorption, which affects the workability and durability of the cementitious materials incorporating them. This makes their direct use in structural concrete impossible. Previous studies have focused on downstream interventions aimed at improving the quality of DAs, such as eliminating old mortar (OM) adhered to natural aggregates (NAs) or limiting its absorption capacity. However, these approaches have proven to be expensive, time-consuming, and, for some, have health consequences. Our objective was to produce DAs suitable for use in structural concrete and to develop a simple, economical, and safe technique to generate good-quality DAs. We designed an upstream intervention based on the measurement of water absorption as a quality indicator. Seven ordinary concretes served as parent concretes (PCs), and after 28 days of maturation, the PC specimens were divided with a metal mass and then separated into ten different subfractions using standardized sieves. Three representative samples per subfraction were subjected to a twenty-minute water absorption evaluation, resulting in seventy arithmetic averages over 210 trials. Fractions (3/8), (8/16), and (16/25) were produced by clustering DA subfractions while emulating the granular distributions of NAs. The calculation of the DA fractions' water absorption was done based on the individual measurements obtained earlier. In the end, 21 average values were emerged. The maximum diameter of each DA (DADmax) was related to that of the NA of its parent concrete (NADmax), making it easier to distinguish between the most and least absorbent DAs. The ratios of 0.8 for the DA sub-fractions and 1 for the reconstituted DA fractions corresponded to DAs with the lowest water absorption capacity. For the DA sub-fractions, the minimum values are 12% to 82% below the average values and 28% to 89% below the maximum values. Similarly, DA fractions reconstituted from DA sub-fractions of the same PC showed a decrease in minimum values of 21% to 43% compared to average values and 31% to 58% compared to maximum values. Selecting the least absorbent DA sub-fractions without taking the PC into account resulted in a further reduction of 4% to 7% compared with the minimum values. The DADmax/NADmax ratio can therefore be used as a production and selection criterion for demolition aggregates.

Graphical Abstract

DADmax/NADmax Ratio: Criterion for the Production and Selection of Demolition Aggregates with Low-Water Absorption

Highlights

  • Addressing the problem of high-water absorption of demolition aggregates (DAs).
  • Unlike previous studies, the intervention in this study takes place at the first stage of DAs preparation.
  • This work has less impact on cost, time and health.
  • Adherence to the DADmax/NADmax threshold ratio of 1 allows DAs to be produced with a minimum amount of adhesive mortar (OM).

Keywords

Main Subjects

References

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History

  • Receive Date: 20 June 2023
  • Revise Date: 02 March 2024
  • Accept Date: 30 April 2024

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