Effect of the addition of ultrafine cement and short fiber reinforcement on shrinkage, rheological and mechanical properties of Portland cement pastes

2004 ◽  
Vol 26 (5) ◽  
pp. 541-549 ◽  
Author(s):  
J. Kaufmann ◽  
F. Winnefeld ◽  
D. Hesselbarth
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Fiber Reinforcement ◽  
Short Fiber ◽  
Cement Pastes ◽  
Ultrafine Cement

scholarly journals Ultrafine portland cement performance

2018 ◽  
Vol 68 (330) ◽  
pp. 157 ◽  
Author(s):  
C. Argiz ◽  
E. Reyes ◽  
A. Moragues
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Portland Cement ◽  
Silica Fume ◽  
Structure Refinement ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Blending Method ◽  
Cement Based Materials ◽  
Ultrafine Cement

By mixing several binder materials and additions with different degrees of fineness, the packing density of the final product may be improved. In this work, ultrafine cement and silica fume mixes were studied to optimize the properties of cement-based materials. This research was performed in mortars made of two types of cement (ultrafine Portland cement and common Portland cement) and two types of silica fume with different particle-size distributions. Two Portland cement replacement ratios of 4% and 10% of silica fume were selected and added by means of a mechanical blending method. The results revealed that the effect of the finer silica fume mixed with the coarse cement enhances the mechanical properties and pore structure refinement at a later age. This improvement is somewhat lower in the case of ultrafine cement with silica fume.

scholarly journals Effect of Methyl Cellulose/Poly(Acrylic Acid) Blends on Physico-Mechanical Properties of Portland Cement Pastes

2017 ◽  
Vol 33 (1) ◽  
pp. 450-457 ◽  
Author(s):  
El-Sayed Negim ◽  
Niyazbekova Rimma ◽  
Lyazzat Bekbayeva ◽  
Utelbayeva Akmaral ◽  
Bengin M. Herki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acrylic Acid ◽  
Portland Cement ◽  
Methyl Cellulose ◽  
Cement Pastes ◽  
Poly Acrylic Acid

A Study of Crushed Glass as a Replacement for Cement in Cement Pastes

2016 ◽  
Vol 714 ◽  
pp. 86-89
Author(s):  
Jana Zahálková ◽  
Pavla Rovnaníková
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Portland Cement ◽  
Natural Resources ◽  
Borosilicate Glass ◽  
Cement Pastes ◽  
Present Trend ◽  
Cement Mixture ◽  
Isothermal Calorimeter

The production of Portland cement is connected with high emissions of greenhouse gases, especially carbon dioxide, and the intensive consumption of energy and natural resources. The present trend is for the replacement of cement by reactive admixtures, which can include ground waste glass, a material which shows pozzolanic activity. This paper deals with the determination of the mechanical properties of cement pastes in which part of the cement mixture (5 to 30 %) was replaced by borosilicate glass. The process by which the hydration of the cement with ground glass began was monitored by an isothermal calorimeter.

scholarly journals Time-Stability Dispersion of MWCNTs for the Improvement of Mechanical Properties of Portland Cement Specimens

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4149
Author(s):  
Laura M. Echeverry-Cardona ◽  
Natalia Álzate ◽  
Elisabeth Restrepo-Parra ◽  
Rogelio Ospina ◽  
Jorge H. Quintero-Orozco
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Portland Cement ◽  
Time Stability ◽  
Cement Pastes ◽  
Multi Wall Carbon Nanotubes ◽  
Vis Spectroscopy ◽  
The Stability ◽  
Over Time

This study shows the energy optimization and stabilization in the time of solutions composed of H2O + TX-100 + Multi-Wall Carbon Nanotubes (MWCNTs), used to improve the mechanical properties of Portland cement pastes. For developing this research, sonication energies at 90, 190, 290, 340, 390, 440, 490 and 590 J/g are applied to a colloidal substance (MWCNTs/TX-100 + H2O) with a molarity of 10 mM. Raman spectroscopy analyses showed that, for energies greater than 440 J/g, there are ruptures and fragmentation of the MWCNTs; meanwhile at energies below 390 J/g, better dispersions are obtained. The stability of the dispersion over time was evaluated over 13 weeks using UV-vis spectroscopy and Zeta Potential. With the most relevant data collected, sonication energies of 190, 390 and 490 J/g, at 10 mM were selected at the first and the fourth week of storage to obtain Portland cement specimens. Finally, we found an improvement of the mechanical properties of the samples built with Portland cement and solutions stored for one and four weeks; it can be concluded that the MWCNTs improved the hydration period.

Reuse of Waste Ceramic Powder with a High Content of Amorphous Phases as Partial Replacement of Portland Cement

2014 ◽  
Vol 905 ◽  
pp. 212-215 ◽  
Author(s):  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Jan Fořt ◽  
Tereza Kulovaná ◽  
Robert Černý
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Ceramic Powder ◽  
Xrd Analysis ◽  
Laser Diffraction ◽  
Partial Replacement ◽  
Future Research ◽  
Cement Pastes ◽  
Amorphous Phases ◽  
Hollow Bricks

A possible use of waste ceramic powder as a partial replacement of Portland cement in blended binders is studied. For the ceramic powder, originating from the contemporary hollow bricks production, the measurement of chemical composition is done using XRF and XRD analysis. The particle size distribution of ceramics and cement is accessed on the laser diffraction principle. The blended binders containing ceramic powder in an amount of 8, 16, 24, 32, and 40% of mass of cement are used for the preparation of cement pastes which are then characterized using the measurement of basic physical properties and mechanical properties. Experimental results show that an application of 16% waste ceramics in the blended binder provides sufficient mechanical properties of the paste. This makes good prerequisites for future research that will be focused on the development of new types of cement-based composites with incorporated ceramic waste powder.

scholarly journals A Review on Reinforcement Methods for Polymeric Materials Processed Using Fused Filament Fabrication (FFF)

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 4022
Author(s):  
Juan Pratama ◽  
Sukmaji I. Cahyono ◽  
Suyitno Suyitno ◽  
Muhammad A. Muflikhun ◽  
Urip A. Salim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fiber Reinforcement ◽  
Polymeric Materials ◽  
Short Fiber ◽  
Continuous Fiber ◽  
Fused Filament Fabrication ◽  
Automotive Components ◽  
The Poor ◽  
Powder Addition ◽  
Processed Products

Over the last few years, fused filament fabrication (FFF) has become one of the most promising and widely used techniques for the rapid prototyping process. A number of studies have also shown the possibility of FFF being used for the fabrication of functional products, such as biomedical implants and automotive components. However, the poor mechanical properties possessed by FFF-processed products are considered one of the major shortcomings of this technique. Over the last decade, many researchers have attempted to improve the mechanical properties of FFF-processed products using several strategies—for instance, by applying the short fiber reinforcement (SFR), continuous fiber reinforcement (CFR), powder addition reinforcement (PAR), vibration-assisted FFF (VA-FFF) methods, as well as annealing. In this paper, the details of all these reinforcement techniques are reviewed. The abilities of each method in improving tensile, flexural, and compressive strength are discussed.

Evaluation of the Electrical Resistivity, Ultrasonic Pulse Velocity and Mechanical Properties in Portland Cement Pastes Type II

2020 ◽  
Vol 841 ◽  
pp. 198-202
Author(s):  
Judith Alejandra Velázquez Perez ◽  
Elia Mercedes Alonso Guzmán ◽  
Wilfrido Martínez Molina ◽  
Hugo Luis Chávez García ◽  
Ioscany Talingo Moreno ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Portland Cement ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Type Ii ◽  
Cement Pastes ◽  
Cementing Material ◽  
Non Destructive

This research is focused on cement pastes with w/c ratio of 0.5. The cementing material is Portland cement type II. The main aim is to estimate the mechanical properties based on non-destructive tests such as ultrasonic pulse velocity, and electrical resistivity by a correlation with the destructive tests such as compressive strength, flexural strength, and tensile strength at ages of 3,7,14,21,28 and 45 days. The results suggest that there is a good correlation between evaluated properties.

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