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Related Concept Videos

Plasticizers01:31

Plasticizers

75
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
75
Soundness of Cement01:17

Soundness of Cement

172
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...
172
Superplasticizers01:30

Superplasticizers

85
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,...
85
Pozzolans01:21

Pozzolans

116
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...
116
Types of Cement II01:22

Types of Cement II

109
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
109
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

99
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
99

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Modified Lignin-Based Cement Solidifying Material for Improving Engineering Residual Soil.

Xiang Yu1,2, Hongbo Lu1, Jie Peng2

  • 1Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China.

Materials (Basel, Switzerland)
|November 25, 2023
PubMed
Summary
This summary is machine-generated.

Modified lignin significantly enhances cement-solidified soil performance. This lignin-based admixture improves soil strength, cohesion, and durability, offering a sustainable solution for soil stabilization and waste utilization.

Keywords:
hydroxylationligninsolidification mechanismsolidifying agent

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Area of Science:

  • Geotechnical Engineering
  • Materials Science
  • Sustainable Chemistry

Background:

  • Unmodified lignin has limited effectiveness in soil stabilization, especially with traditional agents.
  • Lignin-solidified soil shows poor durability under cyclic wet-dry conditions, limiting its application.
  • There is a need for improved soil solidification techniques using sustainable materials.

Purpose of the Study:

  • To investigate the enhancement of cement-solidified soil using hydroxylated lignin.
  • To evaluate the impact of sodium silicate and quicklime as activators on soil properties.
  • To improve the engineering performance and durability of treated slag soil.

Main Methods:

  • Utilized hydroxylated lignin with sodium silicate and quicklime as activators for cement-solidified slag soil.
  • Optimized admixture proportions: 7% cement, 0.4% sodium silicate, 0.2% quicklime, and 0.2% lignin.
  • Assessed engineering properties including strength, cohesion, internal friction angle, and penetration resistance.

Main Results:

  • Composite-solidified soil exhibited 1.5 times higher strength and cohesion compared to cement-solidified soil.
  • Internal friction angle increased by 5.1°, indicating enhanced shear strength.
  • Penetration resistance nearly doubled after 14 days of solidification, signifying improved bearing capacity.

Conclusions:

  • Modified lignin-based admixtures significantly enhance the engineering performance of cement-solidified soil.
  • The developed admixture offers a viable and sustainable approach for soil stabilization.
  • Provides theoretical and technological support for utilizing slag and preparing novel curing agents.