A Simplified Model for Shear Behavior of Mortar Using Biomimetic Carbonate Precipitation
Abstract
:1. Introduction
2. Methodology
2.1. Specimen Preparation
- (1)
- By air pluviation, 85 g of completely dried sand was filled into the cutting ring.
- (2)
- A piece of filter paper was placed on the top to prevent the deformation of specimen and make the fluid permeate evenly through the sand during the spray of cementation solutions. There was also a piece of filter paper at the bottom of the specimen in case the sand adhered to the porous stone.
- (3)
- Deionized water was then sprayed on the filter paper covered on the specimen to get the sand saturated. After that, C1 (5 mL) was first applied from the top surface, and then C2 (also 5 mL) was applied, making one spray cycle.
- (4)
- After a certain number of spray cycles, the cemented specimen was put into an oven of 105 °C for 24 h until the weight got constant.
- (1)
- CaCO3 precipitates and forms a coating on sand particles, which increases the friction between sand particles in the specimen.
- (2)
- As more CaCO3 precipitates, the calcium coating gets thicker, and that on two adjacent sand particles finally gets in contact with each other to form a calcium bonding. That means all sand particles in the specimen have been bonded together by CaCO3 to form a continuous skeleton.
- (3)
- The subsequent precipitation of CaCO3 starts to fill the pores in the skeleton to make the specimen denser.
2.2. Direct Shear Test
3. Results and Discussion
3.1. Effects of L-Asp Modifier
3.2. Effects of Spray Numbers
4. Simplified Model
4.1. Mechanics and Model Mathematics
- (1)
- Stage I ()
- (2)
- Stage II ()
- (3)
- Stage III ()
4.2. Calibration
4.3. Application
- (1)
- Calculate , , and with Equations (2), (3), and (4), respectively.
- (2)
- With the obtained value of and , there is Equation (8). Then, constants and can be solved from Equation (8) together with Equation (7).
- (3)
- Set as 0.5, and the model is worked out.
5. Conclusions
- (1)
- BCP can significantly improve the shear strength of a sand specimen. As the number of spray cycles increases, the shear strength also increases, but the increasing rate at a moderate spray number is much higher than that at a lower or higher one. A similar variation was also observed for residual strength. The effects of spray number on shear strength and residual strength can both be described with sigmoid models, and a spray number of 30 is suggested for engineering applications.
- (2)
- A BCP spray would increase both the brittleness and modulus of the specimen. As the spray number increases, critical displacement decreases, and the variation is roughly linear. Meanwhile, spray number seems to have no obvious influence on the softening behavior of the BCP-treated mortar.
- (3)
- The simplified power model is well fitted to the three stages of direct shear loading and can give accurate predictions in most cases, especially at higher spray numbers. For post-peak stress, the estimate of the model is generally conservative. The softening coefficient k in the model is suggested to be 0.5, which is enough for the model to perform well.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Apparent Density (g/cm3) | Packing Density (g/cm3) | Maximum Dry Density (g/cm3) | Minimum Dry Density (g/cm3) | Friction Angle (°) | D50 (mm) |
---|---|---|---|---|---|
2.654 | 1.430 | 1.603 | 1.386 | 31.39 | 0.13 |
Labels | Compositions of Cementation Solutions (mol/L) | Spray Numbers | ||
---|---|---|---|---|
CaCl2 | L-Asp | Na2CO3 | ||
S0 | 0.5 | 0.0 | 0.5 | 30 |
S1 | 0.5 | 0.5 | 0.5 | 10 |
S2 | 0.5 | 0.5 | 0.5 | 20 |
S3 | 0.5 | 0.5 | 0.5 | 30 |
S4 | 0.5 | 0.5 | 0.5 | 40 |
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Diao, Y.; Bai, J.; Sun, C.; Huang, J.; Yang, C.; Hu, Q. A Simplified Model for Shear Behavior of Mortar Using Biomimetic Carbonate Precipitation. Materials 2023, 16, 5613. https://doi.org/10.3390/ma16165613
Diao Y, Bai J, Sun C, Huang J, Yang C, Hu Q. A Simplified Model for Shear Behavior of Mortar Using Biomimetic Carbonate Precipitation. Materials. 2023; 16(16):5613. https://doi.org/10.3390/ma16165613
Chicago/Turabian StyleDiao, Yu, Jitao Bai, Changyou Sun, Jianyou Huang, Chao Yang, and Qingsong Hu. 2023. "A Simplified Model for Shear Behavior of Mortar Using Biomimetic Carbonate Precipitation" Materials 16, no. 16: 5613. https://doi.org/10.3390/ma16165613