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Related Concept Videos

Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Sampling materials are classified into three main types: solid, liquid, and gas.
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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Updated: Jun 28, 2025

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale
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In Situ Gas Content Prediction Method for Shale.

Ning Li1, Tongwen Jiang2, Wei Xiong1

  • 1Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China.

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This study introduces a reliable method for calculating in situ shale gas content, combining numerical simulation and experiments. The new method accounts for temperature effects, providing more accurate shale gas content predictions than traditional approaches.

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Area of Science:

  • Petroleum Engineering
  • Geoscience
  • Energy Resources

Background:

  • Shale gas is a crucial unconventional energy source with gas existing in free and adsorbed states.
  • Traditional methods for calculating shale gas content have limitations.
  • Accurate determination of in situ gas content is vital for shale gas reservoir evaluation.

Purpose of the Study:

  • To develop and validate a novel method for calculating in situ shale gas content.
  • To investigate the influence of the temperature field on gas content during measurement.
  • To compare the proposed method with traditional techniques like the USBM method.

Main Methods:

  • Numerical simulation of the coring process, considering temperature effects and gas loss.
  • Experimental measurement of gas content under simulated reservoir conditions.
  • Validation of the numerical model by analyzing coring speed and permeability impacts.

Main Results:

  • The numerical model for coring process simulation was validated for reliability.
  • The proposed method yielded comparable results: 5.08 m³/t (simulation) and 4.95 m³/t (experiment).
  • The USBM method underestimated shale gas content at 4.28 m³/t.

Conclusions:

  • A highly reliable in situ gas content prediction method for shale gas has been established.
  • The integrated approach of mathematical modeling and experimental verification enhances accuracy.
  • This method offers a significant improvement over conventional techniques for shale gas assessment.