Influence of lightweight aggregates on the behavior of structural concrete exposed to high temperatures

Experimental work verifies behavior of concrete with various types of cement and aggregate when exposed to high temperatures. Concrete samples differed in the aggregate used (two modes - basalt aggregates, lightweight aggregates), combined with four types of cement (CEM I 42.5 R – Mokrá Czech Republic, CEM II/B-M (S-LL) 32.5 R – Mokrá Czech Republic, CEM II/B-S 32.5 R – Cemex Czech Republic, CEM III/B 32.5 N-SV – Cemex Czech Republic). Properties were determined before and after thermal loading. The aim of the presented experiments was to verify behavior of different types of cement in concrete at high temperatures and the effect of various types of cement for subsequent damage concrete samples after exposure to high temperatures.

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Towards a single-phase mixed formulation of refractory castables and structural concrete at high temperatures

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2021.121064 ◽

2021 ◽

Vol 171 ◽

pp. 121064

Author(s):

M.H. Moreira ◽

R.F. Ausas ◽

S. Dal Pont ◽

P.I. Pelissari ◽

A.P. Luz ◽

...

Keyword(s):

High Temperatures ◽

Single Phase ◽

Mixed Formulation ◽

Structural Concrete ◽

Refractory Castables

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Study of the suitability of a new structural concrete manufactured with carbon fiber reinforced lightweight aggregates sintered from wastes

Materiales de Construcción ◽

10.3989/mc.2019.05719 ◽

2019 ◽

Vol 69 (336) ◽

pp. 204

Author(s):

J. M. Moreno-Maroto ◽

A. L. Beaucour ◽

B. González-Corrochano ◽

J. Alonso-Azcárate

Keyword(s):

Thermal Conductivity ◽

Carbon Fiber ◽

Circular Economy ◽

Lightweight Concrete ◽

Lightweight Aggregate ◽

Coarse Fraction ◽

Normal Weight ◽

Lightweight Aggregates ◽

Structural Concrete ◽

Mechanical And Physical Properties

The suitability of three new lightweight aggregates containing carbon fiber residues (CAs) as components in structural lightweight concrete has been studied. Prismatic concrete specimens were prepared using these CAs as a coarse fraction. Additional specimens of normal-weight aggregate, commercial lightweight aggregate and mortar were prepared for comparison. The CA-concrete samples (CACs) have yielded compressive strength values between 35 and 55 MPa as well as low density and thermal conductivity results. Furthermore, the CACs have displayed the highest ratios of mechanical strength over density and the thermal conductivity, which means that there is a better balance between their mechanical and physical properties than in the other samples studied. These results indicate that the new CAs could have great potential for use in structural lightweight concrete, also complying with the principles of the Circular Economy.

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