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Related Concept Videos

Fineness of Cement01:15

Fineness of Cement

118
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...
118
Types of Cement II01:22

Types of Cement II

94
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...
94
Types of Cement I01:21

Types of Cement I

103
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
103
Soundness of Cement01:17

Soundness of Cement

146
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...
146
Strength of Cement01:20

Strength of Cement

124
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...
124
Porosity in Cement Paste01:18

Porosity in Cement Paste

117
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
117

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Cement classification and characterization using Non-Invasive techniques.

Esteban Romero1, Dennis S Ferreira1, Fabiola M V Pereira2

  • 1Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Instituto de Química Rosario (CONICET-UNR), Suipacha 531, 2000, Rosario, Argentina; Group of Applied Instrumental Analysis, Department of Chemistry, Federal University of São Carlos, P.O. Box 676, São Carlos, São Paulo State, 13565-905, Brazil.

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Summary
This summary is machine-generated.

This study developed advanced analytical methods using chemometrics to accurately quantify elements in cement samples. The novel techniques offer low detection limits and high accuracy, supporting sustainable construction material analysis.

Keywords:
Cement powderData fusionED-XRFFigures of meritLIBSMultivariate calibration

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Cement is a critical construction material produced globally at ~4 billion tons annually.
  • Accurate elemental analysis of cement is vital for quality control and understanding its properties.
  • Existing analytical methods can be resource-intensive and generate significant waste.

Purpose of the Study:

  • To develop and validate robust analytical methods for elemental quantification in cement.
  • To apply multivariate calibration techniques for improved accuracy and sensitivity.
  • To establish environmentally friendly analytical approaches with reduced waste generation.

Main Methods:

  • Preparation of fifty cement samples (11 primary, 39 blends) and 24 for error covariance.
  • Elemental analysis using laser-induced breakdown spectroscopy (LIBS) and energy-dispersive X-ray fluorescence (ED-XRF).
  • Inductively coupled plasma optical emission spectrometry (ICP OES) after acid mineralization.
  • Application of multivariate calibration: Principal Component Regression (PCR), Maximum Likelihood Principal Component Regression (MLPCR), Partial Least-Squares Regression (PLS), and Error Covariance Penalized Regression (ECPR).

Main Results:

  • Development of robust analytical models with high sensitivity (0.3–329 a.u. (% w/w)⁻¹).
  • Achieved low limits of detection (LoD) between 0.00–0.1 % w/w for key elements.
  • Demonstrated remarkable accuracy (67.8%–140.3%), especially for Ca, Fe, Mg, and Na.

Conclusions:

  • Novel chemometric techniques enable accurate and sensitive elemental analysis of cement.
  • The developed methods offer a low-waste, environmentally conscious alternative for cement characterization.
  • This research advances sustainable practices in the construction materials industry through improved analytical methodologies.