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Microstructure-Based Relative Humidity in Cementitious System Due to Self-Desiccation.

Yong Zhang1,2,3, Xiaowei Ouyang4, Zhengxian Yang5,6

  • 1Fujian Provincial University Research Center for Advanced Civil Engineering Materials, Fuzhou University, Fuzhou 350116, China. y.zhang-1@tudelft.nl.

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|April 25, 2019
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Summary

Internal relative humidity (RH) in concrete significantly impacts properties. This study models the relationship between RH and concrete microstructure during self-desiccation, crucial for material performance.

Keywords:
average pore diametercementitious systemmicrostructurerelative humidityself-desiccation

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Physical Chemistry

Background:

  • Internal relative humidity (RH) is a critical factor influencing concrete properties.
  • Self-desiccation, driven by ongoing cement hydration, is a primary cause of RH reduction in concrete.
  • Understanding the interplay between RH and microstructure is essential for predicting concrete behavior.

Purpose of the Study:

  • To investigate the relationship between internal relative humidity (RH) and the microstructure of cementitious systems undergoing self-desiccation.
  • To analyze how different binders and water-binder ratios (w/b) affect RH evolution.
  • To develop a predictive model for RH based on microstructural parameters.

Main Methods:

  • Prepared cement paste specimens with varying binders and w/b ratios.
  • Cured specimens under sealed conditions for durations ranging from 1 day to 1.5 years.
  • Measured internal RH and characterized microstructure, including porosity, pore size, and water content.

Main Results:

  • Internal RH significantly drops within the first 105 days of hydration, with a slower decrease thereafter.
  • Blended materials like fly ash, slag, and limestone powder exhibit distinct effects on RH.
  • A mathematical model was developed to correlate RH with average pore diameter in self-desiccating cementitious systems.

Conclusions:

  • The study establishes a clear link between RH and concrete microstructure under self-desiccation.
  • The proposed model offers a generalized approach to predict RH based on pore structure, independent of age, w/b, or cement type.
  • Findings are valuable for optimizing concrete mix designs and predicting long-term durability.