Ultra high-strength cement-based materials

2010 ◽  
pp. 545-555
Keyword(s):  
High Strength ◽  
Cement Based Materials

scholarly journals Self-consolidating mortar incorporating higher volume blended pozzolans for concrete repair

2019 ◽  
Vol 276 ◽  
pp. 01016
Author(s):  
M. Jamil ◽  
A. B. M. A. Kaish ◽  
E. I. Sahari ◽  
N. L. Fong ◽  
L. Nahar
Keyword(s):  
High Strength ◽  
Experimental Results ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Structural Concrete ◽  
Concrete Repair ◽  
Cement Based Materials

The challenge of repairing cracked or damaged concrete has been increasing worldwide. Several cement-based materials, such as ferrocement, fiber-reinforced cementitious mortar (FRCM), and textilereinforced mortar (TRM), have been developed and used to address the aforementioned challenge. Self-consolidating mortar is required to accelerate structural concrete repair using cementitious composites (e.g., ferrocement, FRCM, and TRM). In this study, a high-strength selfconsolidating mortar is developed using higher-volume (50% by weight of cement) blended pozzolans. Experimental results exhibit potential in terms of flowability and strength. Therefore, this type of cementitious selfconsolidating mortar can be used to expedite concrete repair or strengthening using cementitious composites.

Relationships between Strength and Microstructure for Cement-Based Materials: an Overview

1984 ◽  
Vol 42 ◽  
Author(s):  
Sidney Mindess
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
High Strength ◽  
Pore Geometry ◽  
Precise Form ◽  
Cement Based Materials ◽  
Very High

AbstractThe mechanical properties of cement-based materials must be controlled by the microstructure, pore geometry and chemical composition of the cement, by the properties of the aggregate, and by the nature of the cement-aggregate bond. While the precise form of the strength vs. microstructure relationship is as yet only imperfectly understood, enough is known to permit us to predict what alterations in the microstructure are required for the production of materials with very high strengths. There are also techniques available for reducing the brittleness that is often a characteristic of high-strength materials. The present paper presents an overview of the strength vs. microstructure relationships that can be used to predict the properties of high strength cement-based materials, and a brief review of some of the methods for achieving high strengths.

Very High Strength Cfment-Based Materials – a Prospective

1984 ◽  
Vol 42 ◽  
Author(s):  
Sidney Diamond
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
High Technology ◽  
Critical Crack ◽  
Shrinkage Cracking ◽  
Cement Pastes ◽  
Air Voids ◽  
Shrinkage Cracks ◽  
Cement Based Materials ◽  
Very High

AbstractAn attempt is made to provide a prospective on new very high strength cement based materials. The mechanical properties of concrete and of conventional cement pastes are considered, and limitations on the behavior of paste set by the Griffith concept of a critical crack explored. Evidence is cited confirming that spherical air voids do indeed act as critical Griffith flaws in undried pastes; however it is suggested that shrinkage cracks dominate the behavior of cement paste exposed to drying. Very high strength systems.must avoid both large air voids and other pores and also be resistant to shrinkage cracking. Streams of development leading to “DSP” (Aalborg) and “MDF” (ICI) systems are described, and details of the functioning of the two classes of product are described. Current and potential commercial developments are briefly noted, and possible interrelations with the emerging areas of “high technology ceramics” mentioned. Finally, a brief summary of relevant mechanical properties is provided.

Electromagnetic Properties of Bearing Cement-Based Materials

2011 ◽  
Vol 261-263 ◽  
pp. 663-668
Author(s):  
Ai Li Guo ◽  
Ri Gao ◽  
Heng Jing Ba
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Incident Angle ◽  
High Strength ◽  
Wave Incident ◽  
Electromagnetic Properties ◽  
Frequency Range ◽  
Electromagnetic Wave Incident ◽  
Cement Based Materials

For studying absorption/bearing integration of building materials, high-strength cement-based materials were prepared by using active fly ash, silica fume and quartz, etc. Electromagnetic parameters of the cement-based materials were measured through coaxial method, and then by means of these parameters, the reflectivity of electromagnetic waves of the cement-based materials were simulated under variable electromagnetic wave incident angle (θ), frequency (f) and thickness of the material(d).The reflectivity of electromagnetic waves with 8~18GHz frequency range vertically transmitting into the cement-based materials was obtained through far field radar scattered cross-section measurement, and was compared with simulated reflectance under the same incident conditions. The results show that the high-strength cement-based materials with imaginary part of dielectric constant can consume energy of the incident electromagnetic wave. Incident angle less than 15° has little effect on the reflectivity of the cement-based materials in 2~18GHz frequency range. While the thickness of the cement-based materials is 15mm or 25mm, simulation results of the reflectivity are in good agreement with measured ones. Measured absorption peak and -10dB bandwidth increase with the increasing of thickness of the cement-based materials with compressive strength of 120.7MPa. This suggests that the cement-based materials studied in this paper have the characteristics of absorption/bearing integration.

Fracture Properties of Ultra-High Strength Cement-Based Materials

2017 ◽  
Vol 726 ◽  
pp. 553-557
Author(s):  
Qing Bi ◽  
Wu Yao
Keyword(s):  
Fracture Toughness ◽  
Elastic Modulus ◽  
Bending Strength ◽  
Strain Energy Release ◽  
High Strength ◽  
Defect Size ◽  
Theoretical Derivation ◽  
Fracture Properties ◽  
Working Stress ◽  
Cement Based Materials

By combining the three-point bending beam test with theoretical derivation, the elastic modulus, fracture toughness, surface energy and the maximum defect size permissible under certain working stress of ultra-high strength cement-based materials were obtained. The fracture properties were studied with the water to binder ratios (W/B) from 0.18 to 0.14. Test results showed that the ultra-high strength cement-based materials are quasi-brittle and the net bending strength of specimen decreased substantially when there was a notch. The elastic modulus of ultra-high strength cement-based materials can be up to 74.0 GPa, obviously higher than that of ordinary cement-based materials, showing greater elastic deformation resistance. Moreover, with decrease of W/B ratio, the compressive strength, fracture toughness, critical strain energy release rate as well as the maximum defect size permissible under certain working stress of ultra-high strength cement-based materials increased significantly, indicating that the anti-cracking ability increased with the decrease of W/B ratio.

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