Effects of CaO-Based Expansive Agent on Cement Paste
Author Information
Author(s): Hua Tengfei, Cao Zhiwei, Zhang Shijun, Guo Rongxin
Primary Institution: Yunnan Science and Technology Research Institute of Highway, Kunming, China
Hypothesis
The study investigates the relationship between the expansion and strength of cement paste when using a CaO-based expansive agent.
Conclusion
The addition of CaO-based expansive agent increases the expansion rate of cement paste but reduces its compressive strength.
Supporting Evidence
- The expansion rate of cement paste increases with higher dosages of CaO-based expansive agent.
- Low dosages of the expansive agent can slightly enhance early strength.
- Excessive dosages lead to microcracks and reduced strength.
- The relationship between expansion rate and compressive strength is linear.
Takeaway
Adding a special ingredient to cement can help it expand and prevent cracks, but too much can make it weaker.
Methodology
The study involved testing the expansion rate and strength of cement pastes with varying dosages of CaO-based expansive agent and different mineral admixtures.
Limitations
The study primarily focuses on short-term effects and may not fully capture long-term performance.
Digital Object Identifier (DOI)
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