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Flow Table Test

Flow Table Test

The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...

Design Example: Managing Concrete Workability

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.

Porosity and Absorption of Aggregate

Porosity and Absorption of Aggregate

Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...

Fineness of Cement

Fineness of Cement

The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...

Slump Test

Slump Test

The slump test is a widely used method to measure the workability of concrete. It employs a 12-inch high truncated cone mold that tapers from eight inches at the base to four inches at the top. Before testing, the mold is securely attached to a flat base and dampened.
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...

Hydration of Cement

Hydration of Cement

Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...

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Related Experiment Video

Updated: Aug 12, 2025

Methane Hydrate Crystallization on Sessile Water Droplets

Methane Hydrate Crystallization on Sessile Water Droplets

Published on: May 26, 2021

Combined Approach to Evaluate Hydrate Slurry Transport Properties through Wetting and Flow Experiments.

Martin Fossen¹, Stephan Hatscher², Luis Ugueto²

¹Multiphase Flow, Department of Process Technology, SINTEF AS, 0314Oslo, Norway.

|January 30, 2023

Summary

Evaluating gas condensate systems for hydrate risks, this study found that antiagglomerants (AA) improve hydrate transport properties. Optimized AA concentrations are crucial for preventing hydrate plugging in subsea production systems.

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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

Published on: March 18, 2020

Area of Science:

Petroleum Engineering
Chemical Engineering
Flow Assurance

Background:

Gas hydrate formation poses a significant risk in oil and gas production, particularly in condensate systems.
Current hydrate prevention strategies, like monoethylene glycol (MEG) injection, require optimization for field-specific conditions.
Understanding hydrate particle wettability is key to predicting and mitigating plugging in flow assurance.

Purpose of the Study:

To evaluate the hydrate properties of a condensate oil system using experimental methods.
To assess the effectiveness of gas hydrate antiagglomerants (AA) in preventing hydrate plugging.
To provide insights into the impact of water cut and flow conditions on hydrate risks.

Main Methods:

Utilized the wetting index (WI) procedure to assess antiagglomerant (AA) efficiency.
Employed a wheel flow loop to evaluate the transport properties of hydrate systems with and without AA.
Determined hydrate particle wettability for uninhibited, underinhibited (10% MEG), and AA-inhibited systems.

Main Results:

Antiagglomerant (AA) treatment favorably altered hydrate particle wettability, shifting the emulsion inversion point to higher water cuts.
Uninhibited and underinhibited systems experienced plugging upon hydrate formation.
Flow tests confirmed that AA-treated systems exhibit improved transport properties, reducing plugging risk.

Conclusions:

The wetting index (WI) combined with wheel flow loop testing is an effective methodology for assessing hydrate plugging potential.
Optimized antiagglomerant (AA) concentrations are necessary for specific fluid systems and water cuts to prevent hydrate formation.
This study offers valuable data for selecting and describing the plugging potential and transport properties of gas hydrate systems in condensate production.