Related Experiment Video
Updated: Sep 16, 2025
05:38
Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
Published on: March 7, 2025
459
Experimental study on the dynamic properties of low-cement sludge solidified soil under long-term cyclic loading
Jiantao Lin1,2, Wenjun Wang3, Xiao Cheng2
1School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, No. 928 Baiyang Road, Hangzhou, 310018, China.
Scientific Reports
|July 10, 2025
Summary
Adding 6-7% cement to waste sludge creates stabilized soil with optimal dynamic stability for road subgrade fill. This approach balances performance and cost-effectiveness, enhancing resource utilization.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Environmental Engineering
Background:
- Waste sludge utilization is crucial for construction spoil resource management.
- Cement-stabilized sludge soils are used as subgrade fill but face challenges with low stabilizer content and long-term cyclic loading.
Purpose of the Study:
- To investigate the dynamic strength, cumulative deformation, and elastic modulus of cement-stabilized sludge under cyclic loading.
- To determine the optimal cement content for stabilized sludge used in road engineering.
Main Methods:
- Prepared cement-stabilized soils using Ningbo region sludge with 4-7% cement content.
- Conducted dynamic triaxial tests under long-term cyclic loading.
Main Results:
- Cumulative deformation showed stable or failure patterns, influenced by critical dynamic load and cement content.
- Fatigue life increased by up to 575% when cement content rose from 4% to 6%.
- Diminishing returns observed for fatigue life and elastic modulus beyond 6% cement content.
Conclusions:
- 6-7% cement content represents an optimal economic range for stabilized sludge, balancing dynamic stability and cost.
- Findings offer critical design parameters for applying stabilized sludge in road engineering projects.
Related Concept Videos
01:22Creep in Concrete
475
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
475
01:20Slump Test
442
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...
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...
442
01:22Fatigue Strength of Concrete
288
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
288
01:16Dynamic Modulus of Elasticity of Concrete
552
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
552
01:23Behavior of Concrete Under Compressive Load
280
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
280
01:17Soundness of Cement
241
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
241