Analysis of the Impact and Mechanism of Polyacrylate-Based Composite Paste on the Performance of Recycled Aggregate
Abstract
:1. Introduction
2. Raw Materials and Experimental Methods
2.1. Raw Materials
- (1)
- Cement: The cement used in the experiment is Conch brand P·O 42.5 ordinary Portland cement. The basic physical properties of the cement are shown in Table 1.
- (2)
- Mineral Admixtures: The fly ash used in this experiment is Grade I fly ash from Datang Nanjing Power Plant, with its basic performance indicators shown in Table 2. The gypsum used is produced by the Tangshan New Building Materials Factory in Jiangning District, Nanjing, and its basic properties are also listed in Table 3.
- (3)
- Modified Acrylic Emulsion: The polymer used in this experiment is a modified acrylic emulsion produced by Nanjing Ruidi High-Tech Co., Ltd (Nanjing, China). The basic properties of the polymer emulsion are shown in Table 4; the infrared spectrum is shown in Figure 1. The carboxyl groups can form calcium salt complexes with Ca2⁺ in the cement hydration products, enhancing the mechanical properties of the slurry. The hydroxyl groups can physically adsorb onto cement particles through hydrogen bonding, improving the dispersion of the polymer in the cement matrix and increasing the bonding performance of the cement-based material.
- (4)
- Aggregates: AL aggregates are produced by Changzhou Green Arrow Construction Waste Treatment Co., Ltd. (Changzhou, China) and are made by crushing low-grade concrete and red brick construction waste. AM aggregates are produced from crushed C30 concrete, and AH aggregates are produced from C40 concrete. The properties of the three recycled aggregates (AL, AM, and AH) used in this experiment are shown in Table 5, and their particle size distributions are presented in Table 6.
- (5)
- Sand: River sand from Poyang Lake; water-reducing agent: polycarboxylate-based water-reducing agent; mixing water: tap water.
2.2. Experimental Methods
2.2.1. Composite Slurry Preparation
2.2.2. Recycled Aggregate Concrete
2.2.3. Mechanistic Analysis
- (1)
- Micro-morphology and Microhardness: The micro-morphology of the interfacial transition zone (ITZ) in recycled aggregates was observed using an HVS-1000 digital microhardness tester (Shanghai, China), and the microhardness of the interface region was measured. The tests were conducted with a constant load of 50 g, applied for 10 s. To prevent the concentration of stress due to the densely packed sampling points, which could affect the accuracy of the results, a staggered arrangement method was used to select the test points.
- (2)
- Porosity and Pore Structure: The porosity and pore structure of the samples were characterized using Mercury Intrusion Porosimetry (MIP). The MIP analysis was conducted using a Micromeritics AutoPore IV 9510 (Shanghai, China), which operates in a pressure range of 0.0037 to 241.1 MPa and measures pore diameters from 340 to 0.005 μm.
- (3)
- Microstructure: The microstructure and elemental distribution in specific regions of the samples were analyzed using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS). The testing was performed using a JEOL JSM-5900(Richland, WA, USA). Prior to testing, the sample surfaces were gold-coated to enhance their conductivity.
3. Test Results and Analysis
3.1. Modified Recycled Aggregate Performance Analysis
3.2. Performance Analysis of Recycled Aggregate Concrete
3.2.1. Mechanical Property
3.2.2. Permeability Test
3.2.3. Drying Shrinkage
3.3. Discussion
4. Mechanism Analysis
4.1. Micro-Morphology and Microhardness
4.2. Porosity and Pore Structure
4.3. Analysis of Microstructure
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Density (g/cm3) | Specific Surface Area (m2/kg) | Standard Consistency Water Consumption (%) | Initial Setting Time (min) | Final Setting Time (min) |
---|---|---|---|---|
3.03 | 355 | 27.5 | 195 | 305 |
Density (g/cm3) | Specific Surface Area (m2/kg) | Fineness (45 μm Square Hole Sieve Residue) (%) | Water Demand Ratio (%) |
---|---|---|---|
2.24 | 542.17 | 10.4 | 91 |
Liquidity (mm) | Initial Setting Tiame (min) | Final Setting Time (min) | Compressive Strength (2 h) (MPa) | Flexural Strength (2 h) (MPa) |
---|---|---|---|---|
178 | 10 | 20 | 11.6 | 4.3 |
Solid Content (%) | Density (g·cm−3) | Viscosity (Pa·s) | pH | Grain Size (μm) | MFT (°C) |
---|---|---|---|---|---|
45 | 0.94 | 3.60 | 7.8 | 0.1~0.2 | 7~10 |
Samples | Saturated Surface Dry Apparent Density (kg/m3) | Water Absorption (%) | Crushing Value (%) |
---|---|---|---|
AL | 2120 | 14.96 | 28.8 |
AM | 2411 | 5.01 | 18.9 |
AH | 2444 | 4.93 | 17.6 |
Samples | 20~16 mm | 16~10 mm | 10~5 mm | <5 mm |
---|---|---|---|---|
AL | 6.66 | 81.48 | 11.56 | 0.3 |
AM | 7.69 | 75.16 | 16.95 | 0.2 |
AH | 6.91 | 79.22 | 14.66 | 0.2 |
Samples | Cement (g) | Fly Ash (g) | Gypsum (g) | PAE (g) | Water (g) |
---|---|---|---|---|---|
CE | 300 | 0 | 0 | 0 | 75 |
MA | 246 | 45 | 9 | 0 | 75 |
PCP | 246 | 45 | 9 | 66 | 35.4 |
Samples | Cement | Recycled Aggregates | Sand | Water | CE | PCP | Water-Reducing Agent |
---|---|---|---|---|---|---|---|
RR-AL | 437.5 | 1113.0 | 495 | 175 | 0 | 0 | 7 |
CR-AL | 437.5 | 1113.0 | 495 | 175 | 163.4 | 0 | 7 |
PR-AL | 437.5 | 1113.0 | 495 | 175 | 0 | 163.3 | 7 |
RR-AM | 437.5 | 1046.9 | 495 | 175 | 0 | 0 | 7 |
CR-AM | 437.5 | 1046.9 | 495 | 175 | 144.1 | 0 | 7 |
PR-AM | 437.5 | 1046.9 | 495 | 175 | 0 | 144 | 7 |
RR-AH | 437.5 | 1034.5 | 495 | 175 | 0 | 0 | 7 |
CR-AH | 437.5 | 1034.5 | 495 | 175 | 144.3 | 0 | 7 |
PR-AH | 437.5 | 1034.5 | 495 | 175 | 0 | 144.8 | 7 |
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Li, H.; Li, C.; Wei, H.; Li, Q.; Lu, H.; Ge, J. Analysis of the Impact and Mechanism of Polyacrylate-Based Composite Paste on the Performance of Recycled Aggregate. Materials 2024, 17, 5242. https://doi.org/10.3390/ma17215242
Li H, Li C, Wei H, Li Q, Lu H, Ge J. Analysis of the Impact and Mechanism of Polyacrylate-Based Composite Paste on the Performance of Recycled Aggregate. Materials. 2024; 17(21):5242. https://doi.org/10.3390/ma17215242
Chicago/Turabian StyleLi, Huaisen, Chunhe Li, Hua Wei, Qingan Li, Hao Lu, and Jinyu Ge. 2024. "Analysis of the Impact and Mechanism of Polyacrylate-Based Composite Paste on the Performance of Recycled Aggregate" Materials 17, no. 21: 5242. https://doi.org/10.3390/ma17215242
APA StyleLi, H., Li, C., Wei, H., Li, Q., Lu, H., & Ge, J. (2024). Analysis of the Impact and Mechanism of Polyacrylate-Based Composite Paste on the Performance of Recycled Aggregate. Materials, 17(21), 5242. https://doi.org/10.3390/ma17215242