Measurement of Water Absorption of Recycled Aggregate
Abstract
:1. Introduction
2. Absorption Behaviors and Moisture States of RA
2.1. Absorption Behaviors
2.2. Moisture States
3. Measurement Methods for WSSD of RA
3.1. Standard Methods
3.1.1. Wiping
3.1.2. Slumping
3.2. Centrifugation
3.3. Infrared
3.4. Evaporation
3.5. Airflow Drying
3.6. Conductivity
3.7. Pycnometer
3.8. Hydrostatic Balance
3.9. Extrapolation
4. Prospects
4.1. Suggestions for Slumping
4.2. Suggestions for Heat Transfer
4.3. Suggestions for Absorption Kinetics
4.4. Suggestions for Conductivity
4.5. Suggestions for other Methods
5. Conclusions
- (1)
- Compared with NA, the absorption behaviors of RA have four outstanding features, including higher capacity, larger standard deviations, and time and size dependency. Furthermore, RA has five categories of moisture states. The AD state is an ideal moisture state for RA and the SSD state is usually used to evaluate the additional water of RAC.
- (2)
- In most standards, Wiping and Slumping are used to measure the WSSD of RCA and RFA, respectively. However, the operation of Slumping heavily depends on the operator’s experience because of vague definitions of the slumped shape of RFA. Furthermore, the physical principle of Slumping and its relationship to particle size are still unclear.
- (3)
- The physical principles of Evaporation, Airflow drying, Pycnometer, Hydrostatic balance, and Centrifugation are almost faultless. However, many problems exist in the operation of these methods. For example, the water on one side of RA is largely retained during Centrifugation. Furthermore, during Hydrostatic balance, RFA would absorb a part of water before determining the initial reading.
- (4)
- Although Infrared, Conductivity, and Extrapolation are easy to operate, their physical principles need to be improved. For instance, it is crucial for Infrared to update the water film coefficient formula to be suitable for RFA. In addition, the influence of water content on the bulk density of RFA and the number of inter-particle contacts in Conductivity should be clarified.
- (5)
- To develop an accurate and convenient method for measuring the WSSD of RA, several suggestions are proposed, including the combination of Evaporation and Airflow drying where the mass change of RFA can be recorded after each tumble, the liquid selection in Hydrostatic balance (e.g., kerosene or paraffin), and the addition of a tiny mixer in each centrifuge tube.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Moisture States | Schematic Diagram | Description |
---|---|---|
Oven dry (OD) | | The pores inside the aggregate are completely dry, and there is no water on the surface. |
Air dry (AD) | | The bottom of the pores inside the aggregate is filled with water, while the top of the pores near the surface keeps dry [46]. Meanwhile, there is no water on the surface. |
Surface saturation surface-dry (SSSD) | | The bottom of the pores inside the aggregate keeps dry, while the top of the pores near the surface is filled with water [46]. Meanwhile, there is no water on the surface. It generally happens on the pores with a large aspect ratio. |
Saturated surface-dry (SSD) | | The pores inside the aggregate are filled with water, while there is no water on the surface. |
Over saturation (OS) | | The pores inside the aggregate are filled with water, and there is a water film on the surface. |
Reference | Tool | Procedure | Judgment |
---|---|---|---|
NF EN 1097-6 [53] | Dry towel |
| All visible films of water are removed, but aggregates still have a damp appearance. |
BS 812: part 2 [54] | |||
ASTM C127-12 [55] |
| ||
GB/T 25177 [56] |
| - | |
Castro et al. [57] | Dry tissue | Patting the surface of aggregates dry with a dry tissue. | Visual inspection: It appears that the tissue is no longer absorbing moisture from aggregates. |
IFSTTAR. Test Method No. 78 [59] | Colorful absorbent tissue | Drying aggregates progressively with different sheets of colorful absorbent tissues. | No trace of water can be seen on the tissues. |
Standards | Procedures | Judgment |
---|---|---|
ASTM C128-12 [61] |
| Slight slumping of the molded fine aggregate indicates that it has reached a surface-dry condition. |
AASHTO T-84 [62] |
| When the fine aggregate achieves an SSD condition, the fine aggregate will slump. |
EN 1097-6 [53] |
| The collapse situation occurs at mold removal. |
GB/T 14684 [60] |
| Repeating the operation until fine aggregates reach a fixed shape. |
Methods | Scenarios | Advantages | Disadvantages |
---|---|---|---|
Wiping | Laboratory and construction site |
|
|
Slumping |
| ||
Centrifugation | Laboratory |
|
|
Infrared |
|
| |
Evaporation |
|
| |
Airflow drying |
|
| |
Conductivity | Laboratory and construction site |
|
|
Pycnometer |
|
| |
Hydrostatic balance | Laboratory |
|
|
Extrapolation |
|
|
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Duan, Z.; Zhao, W.; Ye, T.; Zhang, Y.; Zhang, C. Measurement of Water Absorption of Recycled Aggregate. Materials 2022, 15, 5141. https://doi.org/10.3390/ma15155141
Duan Z, Zhao W, Ye T, Zhang Y, Zhang C. Measurement of Water Absorption of Recycled Aggregate. Materials. 2022; 15(15):5141. https://doi.org/10.3390/ma15155141
Chicago/Turabian StyleDuan, Zhenhua, Wenjing Zhao, Taohua Ye, Yunhui Zhang, and Chuanchuan Zhang. 2022. "Measurement of Water Absorption of Recycled Aggregate" Materials 15, no. 15: 5141. https://doi.org/10.3390/ma15155141
APA StyleDuan, Z., Zhao, W., Ye, T., Zhang, Y., & Zhang, C. (2022). Measurement of Water Absorption of Recycled Aggregate. Materials, 15(15), 5141. https://doi.org/10.3390/ma15155141