Structure-Property Relationships of Polymer-Modified Cement Concrete (PCC) Under Service Temperature Conditions.

Area of Science:

• Materials Science
• Civil Engineering
• Polymer Chemistry

Background:

• Polymer modification is key to optimizing cementitious materials like mortars and concretes.
• Polymer addition significantly alters fresh and hardened properties.
• Understanding temperature effects is crucial for material performance.

Purpose of the Study:

• Investigate the time-dependent properties of cement pastes, mortars, and concretes modified with three different polymer dispersions.
• Analyze the influence of varying temperatures within the service range on these properties.
• Elucidate the structure-property relationships under thermal stress.

Main Methods:

• Systematic, stepwise experimental campaign.
• Testing cement pastes, mortars, and concretes with three distinct polymer dispersions.
• Evaluating properties at different temperatures, including -20 °C.

Main Results:

• Polymer modifications significantly affect hardened cement-based material behavior.
• Strength and deformation resistance generally decrease with increasing temperature, more so in polymer-modified materials.
• -20 °C induced notable changes in mechanical behavior, particularly flexural strength and early stiffness, due to pore water freezing.

Conclusions:

• Polymer-modified cement-based materials exhibit intrinsic temperature-dependent behavior.
• Pore water freezing at low temperatures leads to stiffening.
• Findings provide critical insights into material performance across service temperatures.