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Related Concept Videos

Strength of Cement01:20

Strength of Cement

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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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Water Cement Ratio01:28

Water Cement Ratio

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The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and...
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Types of Cement II01:22

Types of Cement II

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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...
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Aggregate Cement Ratio01:21

Aggregate Cement Ratio

492
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
492
Fineness of Cement01:15

Fineness of Cement

410
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...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

249
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.
249

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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Experimental Study on Mix Proportion Parameter Optimization of Cement Anchoring Material.

Jinzhang Jia1,2, Bin Li1,2, Fei Liu3

  • 1College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China.

Materials (Basel, Switzerland)
|January 8, 2020
PubMed
Summary

This study optimized cement anchoring material ratios using orthogonal design and rock mechanics tests to enhance rock mass stability. Optimized materials significantly improved anchoring system safety and prevented surrounding rock deformation.

Keywords:
anchoring material ratiomechanical property indexmultiple linear regression analysisorthogonal design methodsafety of anchorage system

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Area of Science:

  • Geotechnical Engineering
  • Materials Science
  • Rock Mechanics

Background:

  • Major deformation of surrounding rock and instability in rock masses pose significant risks in mining and civil engineering.
  • Effective rock mass stabilization relies heavily on the performance of anchoring systems and the properties of anchoring materials.

Purpose of the Study:

  • To optimize the ratio of cement anchoring material for improved stability of unstable rock masses.
  • To identify key factors influencing the bond and adhesion stresses of anchoring materials.
  • To develop empirical equations for guiding engineering support design.

Main Methods:

  • Orthogonal design method was employed to create 18 material matching schemes.
  • Six influencing factors were investigated: coal ash, sodium silicate, ettringite, naphthalene sulfonate content, water-cement ratio, and sand-cement ratio.
  • Compressive strength, pull-out force, bond stress, and adhesion stress tests were conducted, followed by range analysis, ANOVA, and multiple linear regression.

Main Results:

  • Compressive strength ranged from 43-55 MPa; bond stress between bolt and agent was 103-136 kN; adhesion stress between agent and rock was 76-112 kN.
  • Coal ash content significantly controlled bond stress, while water-cement ratio, sand-cement ratio, and sodium silicate dosage also showed significant influence.
  • Sodium silicate content had the greatest impact on adhesion stress, followed by the water-cement ratio.

Conclusions:

  • The study successfully determined the optimal ratios for cement anchoring materials, leading to enhanced mechanical properties.
  • Empirical equations derived from regression analysis provide valuable guidance for engineering support design.
  • The optimized anchoring material demonstrated effectiveness in improving the safety of surrounding rock anchoring systems.