Preparation of an Ester-Based Polymeric Hydration Temperature Rise Inhibitor and Its Action Mechanism on Cement...

Area of Science:

• Materials Science
• Chemical Engineering
• Civil Engineering

Background:

• Early cement hydration generates significant heat, leading to thermal cracking in concrete structures.
• Controlling the hydration process is crucial for improving the durability and performance of cementitious materials.

Purpose of the Study:

• To design and synthesize a novel Ester-based Polymeric Hydration Temperature Rise Inhibitor (ETRI).
• To investigate the impact of ETRI on cement hydration kinetics, heat release, and microstructure.
• To evaluate the effectiveness of ETRI compared to conventional retarders.

Main Methods:

• Synthesis of ETRI based on slow ester hydrolysis.
• Incorporation of ETRI into cementitious materials.
• Systematic investigation of hydration kinetics and hardened paste microstructure.
• Mechanistic study of ETRI's interaction with cement hydration products.

Main Results:

• ETRI effectively regulates cement hydration heat release by prolonging the induction period.
• At 1.5% dosage, ETRI reduced peak heat release rate by 70.32% and 72h cumulative heat release by 70.82%.
• ETRI promotes later-age hydration, refining pore structure and increasing harmless pores to 53.97%.

Conclusions:

• ETRI offers a superior method for inhibiting cement hydration heat compared to conventional retarders.
• The slow hydrolysis of ETRI generates carboxyl groups that complex with Ca2+ and adsorb onto cement particles, retarding hydration.
• ETRI achieves synergistic improvements in microstructure and late-age mechanical properties of cementitious materials.