Bentonite-Modified Cementitious Materials in Construction Applications

Traditional binders like cement and lime face challenges such as high energy consumption, environmental impact, poor water retention, and cracking. Bentonite, a natural volcanic clay with unique ion exchange, plasticity, and adsorption properties, offers sustainable alternatives.

1. Bentonite-Modified Cement
Bentonite enhances cement hydration and hardening. Calcined bentonite exhibits pozzolanic activity, improving compressive strength and durability. Studies show calcined bentonite (30% replacement) reduces cement use while maintaining 90%+ strength retention. Non-calcined variants require strict dosage control (<5% replacement) to avoid strength loss.

2. Bentonite-Lime Mortars for Heritage Restoration
In Mediterranean climates, bentonite-lime mortars (BAL) repair aged adobe structures. XRD analysis reveals minimal pozzolanic reactions, but SEM/EDS confirms calcium aluminosilicate formation, proving latent reactivity. BAL improves humidity regulation in low-moisture environments.

3. Earthquake-Resistant Concrete
Bentonite (20-40% replacement) reduces concrete's elastic modulus while enhancing ductility and energy dissipation. Pakistan trials demonstrate:

150 °C-calcined bentonite boosts sulfate resistance.

40% replacement lowers CO₂ emissions by 22% vs. Portland cement.

4. Lightweight Aggregates & Sintered Ceramsite
Bentonite's fine particle size and binding capacity optimize sintered ceramsite production. Mixes with tailings/glass waste yield aggregates with:

14% lower density vs. conventional ceramsite.

18 MPa compressive strength (meets ASTM C330).

5. Phase-Change Materials (PCMs) & Thermal Insulation
Bentonite-based PCMs (e.g., CA/Bentonite composites) achieve:

2.3× higher thermal stability vs. pure organics.

14.31% improved insulation in EPS-porous concrete.

Conclusion
Bentonite reduces construction costs by 15-30%, cuts CO₂ emissions, and enhances material resilience. Ongoing research focuses on optimizing calcination protocols and large-scale industrial adoption.

Xinxiang Heying Machinery Equipment Co., Ltd. is located in Xinjiang City, Henan Province, known as the "Vibration Capital of China".

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