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Absorption behavior of polycarboxylate superplasticizer with different molecular structures on montmorillonite
Haifeng Yang1, Mingyi Li1, Lisha Pan1
1School of Chemical Engineering and Technology, Hainan University, Haikou, 570228, Hainan, China.
Environmental Research
|October 13, 2022
Summary
Polycarboxylate (PCE) efficiency decreases with low-quality sand containing montmorillonite (MMT). Long side-chain PCE shows better MMT tolerance, offering solutions for concrete with MMT-contaminated sand.
Area of Science:
- Materials Science
- Civil Engineering
- Concrete Technology
Background:
- High-performance concrete increasingly uses low-quality sands.
- Low-quality sands often contain montmorillonite (MMT), which reduces polycarboxylate (PCE) superplasticizer efficiency.
Purpose of the Study:
- Investigate PCE absorption on MMT to develop PCE suitable for low-quality sands.
- Explore the MMT tolerance mechanism of comb-type PCE.
Main Methods:
- Synthesized six comb-type PCEs with varying side-chain lengths and acid-ether ratios.
- Analyzed PCE-MMT interactions using FT-IR, DLS, and TOC in cement slurry.
Main Results:
- Long side-chain PCE intercalated into MMT layers more readily than short side-chain PCE.
- PCE absorption on MMT decreased with increasing acid-ether ratio.
- Long side-chain PCE exhibited shear-thickening, while short side-chain PCE showed shear-thinning in MMT-containing slurry.
Conclusions:
- PCE side-chain length significantly impacts MMT tolerance and rheological behavior.
- Optimizing PCE structure is crucial for effective use in concrete with MMT-contaminated sands.
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