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Related Concept Videos

Superplasticizers01:30

Superplasticizers

105
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

102
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.
102
Placing Concrete01:17

Placing Concrete

137
The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
137
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

112
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
112
Slump Test01:20

Slump Test

280
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...
280
Factors Affecting Workability01:24

Factors Affecting Workability

93
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
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Related Experiment Video

Updated: Jul 23, 2025

Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
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Study on the Performance and Solidification Mechanism of Multi-Source Solid-Waste-Based Soft Soil Solidification

Keyi Qiu1, Guodong Zeng2, Benan Shu2

  • 1School of Civil Engineering, Foshan University, Foshan 528000, China.

Materials (Basel, Switzerland)
|July 14, 2023
PubMed
Summary

This study developed a novel soft soil solidification material using multiple solid wastes. The material effectively enhances soil strength and meets technical requirements, offering a sustainable alternative to cement.

Keywords:
soft soilsolid wastesolidification mechanismunconfined compressive strength

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Area of Science:

  • Geotechnical Engineering
  • Materials Science
  • Environmental Engineering

Background:

  • Soft soils pose engineering challenges due to low strength and high compressibility.
  • Traditional soil stabilization methods often rely on cement, which has environmental drawbacks.
  • Valorization of industrial solid wastes is crucial for sustainable development.

Purpose of the Study:

  • To develop a multi-source solid-waste-based material for soft soil solidification.
  • To evaluate the effectiveness of this material in improving soft soil properties.
  • To assess the potential of solid waste as a substitute for cement in soil stabilization.

Main Methods:

  • Ground granulated blast furnace slag, steel slag, red mud, waste ceramic powder, and desulfurization gypsum were used as raw materials.
  • Three ratios were tested, and strength activity index determined solid waste fractions.
  • Mineralogical and microstructural characterization employed X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis-differential scanning calorimetry (TG&DSC).

Main Results:

  • Unconfined compressive strength of stabilized soft soils increased with solidifying agent content.
  • Failure strain decreased, indicating a shift from plastic to brittle failure.
  • Optimum solidifying agent content of 17% yielded unconfined compressive strengths of 3.16 MPa (sandy soil), 2.05 MPa (silty clay), and 1.04 MPa (organic clay) at 28 days.

Conclusions:

  • The developed multi-source solid-waste material significantly improves soft soil strength.
  • The material meets technical requirements for cement-soil mixing piles.
  • This research demonstrates the feasibility of using diverse solid wastes as a sustainable alternative to cement for soil stabilization.