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Related Concept Videos

Slump Test01:20

Slump Test

327
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...
327
Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

224
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

149
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
149
Factors Affecting Workability01:24

Factors Affecting Workability

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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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Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

206
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Pozzolans01:21

Pozzolans

166
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
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Related Experiment Video

Updated: Aug 9, 2025

Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
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Microstructure Analysis and Mechanical Properties of Backfill Material Using Stone Sludge.

Jong-Won Lee1, Cheolmin Baek1

  • 1Department of Highway and Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Republic of Korea.

Materials (Basel, Switzerland)
|February 25, 2023
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Summary

This study optimized controlled low-strength material (CLSM) using stone sludge as backfill. The optimal ratio ensures excellent mechanical properties and field performance for road excavation and restoration.

Keywords:
CLSMbackfillstone sludge

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Environmental Engineering

Background:

  • Road excavation generates significant stone sludge, posing disposal challenges.
  • Controlled low-strength material (CLSM) is widely used for backfilling utility trenches.
  • Sustainable utilization of industrial byproducts like stone sludge in construction materials is crucial.

Purpose of the Study:

  • To determine the optimal mixing ratio of CLSM using stone sludge as backfill.
  • To evaluate the mechanical properties, microstructure, and field performance of CLSM with stone sludge.
  • To assess the feasibility of using stone sludge-based CLSM for road excavation and restoration.

Main Methods:

  • Compounding factors were analyzed to determine the optimal mixing ratio for CLSM with stone sludge.
  • Mechanical properties (flow, material separation resistance, initial and re-excavation strength) were evaluated against ASTM standards.
  • Microstructure analysis was performed to understand material behavior.
  • A small-scale field evaluation and 5-month monitoring were conducted.

Main Results:

  • The optimal mixing ratio for CLSM containing stone sludge was determined to be 350% W/B.
  • Field evaluation showed a flow of 230 mm and initial/re-excavation strengths of 0.75 and 1.15 MPa, meeting ASTM standards.
  • No ground subsidence was observed over 5 months of monitoring.
  • Re-excavation was feasible, with no significant damage to the CLSM or surrounding pipes.

Conclusions:

  • Stone sludge can be effectively utilized as a component in CLSM for backfilling applications.
  • The optimal mixing ratio ensures CLSM meets required mechanical and performance standards for road restoration.
  • This approach offers a sustainable solution for managing stone sludge and improving construction practices.