Selected Properties of Cementitous Composites with Portland Cements and Blended Portland Cements in Extreme Conditions

Bodnárová, Lenka; Jarolím, Tomáš; Válek, Jaroslav; Brožovský, Jiří; Hela, Rudolf

doi:10.4028/www.scientific.net/amm.507.443

Cited by 10 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, pozzolanic additives retard initial evolution of mechanical properties but they provide very interesting values of long-term properties in relation to durability; predominantly in concrete technology is further application of various pozzolanic additive solutions to ensure suitable rheology, mechanical parameters, and durability properties presented by frost and chemical resistance [31].…”

Section: Fine Ground Ceramic Powder (Fgcp)mentioning

confidence: 99%

See 1 more Smart Citation

Physical and Mechanical Properties of Composites Made with Aluminous Cement and Basalt Fibers Developed for High Temperature Application

Reiterman

Holčapek

Jogl

et al. 2015

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Present paper deals with the experimental study of the composition of refractory fiber-reinforced aluminous cement based composites and its response to gradual thermal loading. Basalt fibers were applied in doses of 0.25, 0.5, 1.0, 2.0, and 4.0% in volume. Simultaneously, binder system based on the aluminous cement was modified by fine ground ceramic powder originated from the accurate ceramic blocks production. Ceramic powder was dosed as partial replacement of used cement of 5, 10, 15, 20, and 25%. Influence of composition changes was evaluated by the results of physical and mechanical testing; compressive strength, flexural strength, bulk density, and fracture energy were determined on the different levels of temperature loading. Increased dose of basalt fibers allows reaching expected higher values of fracture energy, but with respect to results of compressive and flexural strength determination as an optimal rate of basalt fibers dose was considered 0.25% in volume. Fine ground ceramic powder application led to extensive increase of residual mechanical parameters just up to replacement of 10%. Higher replacement of aluminous cement reduced final values of bulk density but kept mechanical properties on the level of mixtures without aluminous cement replacement.

show abstract

Section: Fine Ground Ceramic Powder (Fgcp)mentioning

confidence: 99%

“…Bulk density of studied composites was investigated on the base of the actual weight and accurate dimensions of specimens. Changes of bulk density are related to structural transformation and mineralogical changes during heating [31].…”

Section: Investigated Parametersmentioning

confidence: 99%

Physical and Mechanical Properties of Composites Made with Aluminous Cement and Basalt Fibers Developed for High Temperature Application

Reiterman

Holčapek

Jogl

et al. 2015

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…2,3 The experiment aimed to observe the behaviour of several concrete mixtures over longer period and slightly reduced heating with the focus on the surface damage caused by heat and spalling.…”

Section: Evaluation Of Results -Thermal Load Of Test Specimensmentioning

confidence: 99%

“…It is crucial to filter measured values with respect to influence of high temperatures -most of the commonly available measuring devices are not adapted to high temperatures and therefore it is necessary to verify data with respect to reference values. The test specimens can be evaluated from the point of view of physical-mechanical properties (comprising boreholes in the material and destructive testing of the materials 2 as well as non-destructive testing of material parameters) 3 and their changes caused by elevated temperature. Samples can also be used for studying the changes in the microstructure and products of hydration after applying different temperatures.…”

Section: Values Observed During Experimental Thermal Loading Of Test mentioning

confidence: 99%

Possibilities of observation of behaviour of concrete- and cement-based composite materials exposed to high temperatures

Bodnárová

Horak

Válek

et al. 2015

Materials Research Innovations

View full text Add to dashboard Cite

The paper describes possibilities of observation of behaviour of concrete-and cement-based composite material exposed to high temperatures. Nowadays, for large-scale tests of behaviour of concrete exposed to high temperatures, testing devices of certified fire testing stations and laboratories are used. These tests are quite expensive. For experimental verification of smaller test specimens, a testing device was built at the Brno University of Technology, where tests of thermal loading of concrete tests specimens of various sizes can be carried out (dimensions up to 800 × 800 × 800 mm or slabs of length up to 1100 mm). The testing device opens new ways of observation of behaviour of concrete-and cement-based composite materials exposed to high temperatures. First test results are discussed to prove their applicability in comparison with large-scale tests.

show abstract

“…High dosage of active additives in NSC (normal strength concrete) causes a decrease of pH in hardened concrete and a loss of natural protection of steel reinforcement too, but with the use of pozzolanic additives following reaction providing substantial sealing effect of new hydrates, so carbonation is not accelerated by increased permeability. Unfortunately in the case of HPC low permeability means low resistance to fire [4] and extreme temperature loading where the material is damaged by escaping steam, other gases performing in concrete, or by formation of frost.…”

Section: Introductionmentioning

confidence: 99%

Scaling resistance of special high performance composites with burnt clay additive

Reiterman¹,

Jogl²,

Konvalinka³

2015

Computational Methods and Experimental Measurements XVII

View full text Add to dashboard Cite

This paper deals with the experimental study of the composition of special highperformance Portland cement based composites and their resistance to de-icing salt scaling. The aim of this was to evaluate the impact of pozzolanic additiveburnt clay, the application of which is documented by several research works. Studied composites are formulated as fine-grain high performance concrete with high dose of Portland cement and silica fume and very low rate of water-cement ratio to ensure reduced permeability. Burnt clay was applied as cementitious supplementary material to reduce the environmental impact of concrete mixtures and to obtain suitable microstructure. Portland cement replacement by the above mentioned additive was gradually elevated just up to the rate of 60% of Portland cement weight. Investigation of scaling resistance was complemented by measuring surface water absorption and determination of flexural and compressive strength which exceeded the level of 100 MPa for studied mixtures. Mechanical properties were not extensively affected by burnt clay additive, but the essential impact of studied pozzolanic material was noticeable in the case of scaling and absorption tests, which means processes regulated by permeability. In this point of view, optimum rate of replacement by burnt clay seems to be about 30% of Portland cement weight. A mixture with optimal composition exhibited increased durability by more than 50% to reference mixture. Application of burnt clay contributed to good potential for practical use for all tested properties with significant production energy savings.

show abstract

Selected Properties of Cementitous Composites with Portland Cements and Blended Portland Cements in Extreme Conditions

Cited by 10 publications

References 4 publications

Physical and Mechanical Properties of Composites Made with Aluminous Cement and Basalt Fibers Developed for High Temperature Application

Physical and Mechanical Properties of Composites Made with Aluminous Cement and Basalt Fibers Developed for High Temperature Application

Possibilities of observation of behaviour of concrete- and cement-based composite materials exposed to high temperatures

Scaling resistance of special high performance composites with burnt clay additive

Contact Info

Product

Resources

About