Recycled aggregates show, however, high water absorption due to porosity. At saturation, water flows from the inside to the engaging cement paste matrix and at dryness the opposite process occurs.

Crushing waste concrete and using it directly as RAs has the disadvantages of high porosity and high water absorption. To achieve the reuse of resources, the researchers use microbial mineralization methods to further reinforce RAs. In this paper, the effect of the microbial carbonic anhydrase mineralization method on the water …

High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with recycled coarse aggregate.

Abstract. Owing to the high absorption capacity of recycled aggregate (RA), it is crucial to accurately measure its saturated-surface-dried water absorption (W …

The results of the water absorption measurements of the recycled concrete aggregate are presented in Table 3.

Owing to the high absorption capacity of recycled aggregate (RA), it is crucial to accurately measure its saturated-surface-dried water absorption (WSSD), which largely affects an effective water ...

The recycled materials were characterized to assess their suitability for structural concrete production. The behavior and underlying mechanisms of recycled sands and aggregates proved to be identical, irrespective of their size. Water absorption emerged as a key parameter for evaluating the purity and quality of these materials.

Because of its higher water absorption and lower density, the use of recycled aggregate can cause a slight reduction in workability and compressive strength of concrete. Thus, authors have evaluated methods to remove the adhered mortar or to seal the pores of recycled aggregates, enhancing the material quality.

This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, with emphasis on structural applications and identification of challenges and opportunities of RCA/RAC materials in Southeast Asia. For the first time and as a first step towards …

In this paper, we compare different methods for determining the water absorption of recycled aggregates (RAs) and, highlighting advantages and critical points, attempt to suggest alternatives for a better way to measure it.

The water absorption of aggregates is a key parameter in concrete mix design. As the adhered mortar of recycled aggregates present a long time of saturation (>24 h). A new approach of water absorption measurement was developed using hydrostatic weighing in order to observe the kinetic absorption of aggregates, and to …

The high absorption of fine recycled aggregates is indicated as the main difference with respect to fine natural aggregates. This property determines the extra amount of water to be added during…

A new approach of water absorption measurement was developed using hydrostatic weighing in order to observe the kinetic absorption of aggregates, and to obtain a necessary water quantity added in different steps in concrete mix. Experimental results indicate that the model of capillarity processes of aggregates can be obtained …

In this paper, we compare different methods for determining the water absorption of recycled aggregates (RAs) and, highlighting advantages and critical points, attempt to suggest alternatives for a better way to measure it. Water absorption (WA) capacity has two purposes: (a) measuring the interconnected porosity, which is useful …

High water absorption is a typical characteristic of recycled coarse aggregate and is often used to explain the loss of performance of concrete when replacing natural coarse aggregate with recycled coarse aggregate.

The quality control of aggregates for concrete involves determining their water absorption and apparent density, indicators of the material's porosity. The standard methods were developed for natural aggregates and are less appropriate for construction and demolition waste recycled aggregates (RAs), which have greater porosity and …

Owing to the high absorption capacity of recycled aggregate (RA), it is crucial to accurately measure its saturated-surface-dried water absorption (WSSD), which largely affects an effective…

Because of the higher water absorption, recycled coarse aggregates typically need more water than conventional concrete to obtain the same workability; it also affects the homogeneity of the fresh concrete during casting, reducing the mechanical strength of …

Adhered cement mortar is the primary factor that distinguishes natural aggregate from recycled concrete aggregate [ 11 ], and it is responsible for surface porosity, low density, and high water absorption of RA [ 12 ]. Its quality and quantity depend on the original concrete waste, production treatment, and size fraction which …

The high absorption of fine recycled aggregates is indicated as the main difference with respect to fine natural aggregates. This property determines the extra …

In this work a staged mixing method based on the aggregate water absorption over time was developed. A staged mixing procedure was optimized to regulate the water flow and manufacture concrete, using recycled aggregates, with levels of workability, strength and shrinkage equivalent to those of conventional concrete.

The high absorption of fine recycled aggregates is indicated as the main difference with respect to fine natural aggregates. This property determines the extra amount of water to be added during mixing to avoid a loss in workability when these aggregates are used for making concrete. Although several methods have been …

The effects of recycled coarse aggregate replacement rate and freeze–thaw cycles on the mass loss, compressive strength, relative dynamic elastic modulus and capillary water absorption of recycled concrete were analyzed.

The high water absorption of recycled concrete aggregates (RCA) can cause a significant reduction in the flow properties of cement-based materials in relation to mixes produced with natural aggregate.

The results of the water absorption measurements of the recycled concrete aggregate are presented in Table 3.

This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability …

Recycled concrete presented higher void index and, consequently, higher water absorption. This fact is due to the presence of attached mortar on RCA particles, which is responsible for the higher porosity of this material in …

Recycled concrete aggregates (RCA), during their carbonation, can uptake CO2. Carbonation is described also as a treatment for RCA, to improve water absorption. The aim of this article is to ...

In this paper, we compare different methods for determining the water absorption of recycled aggregates (RAs) and, highlighting advantages and critical …

The quality of recycled aggregate, in terms of RM mechanical properties, affects the strength of recycled aggregate concrete when the water-binder ratio is low; on the contrary, this not happens when the water-binder ratio is high, being the strength principally affected by the water content in the mix.