Masonry exposed to high temperatures: Mechanical behaviour and properties—An overview

2013 ◽  
Vol 55 ◽  
pp. 69-86 ◽  
Author(s):  
Salvatore Russo ◽  
Francesca Sciarretta
Author(s):  
Thanyawat Pothisiri ◽  
Pitcha Jongvivatsakul ◽  
Vanichapoom Nantavong

<p>The use of post‐installed rebars into existing reinforced concrete structures bonded with epoxy resins was constantly increasing due to the advantage of equivalent or even higher bearing capacities at service temperature, compared with conventional cast‐in‐place rebars. Previous studies have examined the effects of different parameters on the mechanical properties of bonded post‐installed rebars at normal temperature. These studies showed that, for rebar diameter equal to 10 mm, the load bearing capacity increases linearly with the embedment length up to 75 mm. However, upon exposure to high temperatures, the glass transition of epoxy resins may occur and affect the mechanical behaviour of the adhesive bond. Studying the mechanical behaviour of an adhesive anchor at high temperatures is therefore necessary. An experimental investigation is conducted herein to examine the characteristics of the adhesive bonding stress between steel rebar and concrete interface at elevated temperatures using a series of pull‐out tests with varying rebar diameters and embedment lengths.</p>


Carbon ◽  
2002 ◽  
Vol 40 (11) ◽  
pp. 1919-1927 ◽  
Author(s):  
E. Bruneton ◽  
C. Tallaron ◽  
N. Gras-Naulin ◽  
A. Cosculluela

1976 ◽  
Vol 11 (10) ◽  
pp. 1843-1848 ◽  
Author(s):  
T. Chandra ◽  
J. J. Jonas ◽  
D. M. R. Taplin

2020 ◽  
Vol 70 (337) ◽  
pp. 213 ◽  
Author(s):  
B. Qu ◽  
A. Fernández Jiménez ◽  
A. Palomo ◽  
A. Martin ◽  
J. Y. Pastor

The high-temperature mechanical behaviour of a pre-industrial hybrid alkaline cement (HYC) was studied. The HYC in question contained 30 % Portland clinker and 70 % of a blend of slag, fly ash and a solid activator (mix of alkaline salts with a predominance of Na2SO4). The material was tested during exposure to high temperatures to establish its compressive and bending strength and elastic modulus, as well as fracture toughness, analysed using an innovative methodology to notch the hydrated cement paste specimens. Post-thermal treatment tests were also run to assess residual mechanical strength after 2 h of exposure to temperatures ranging from 400 °C to 1000 °C. TG/DTA, MIP and SEM were deployed to ascertain heat-induced physical-chemical changes in the structure. The higher mechanical strength during and after treatment exhibited by the hardened hybrid alkaline cement than the CEM I 42.5R ordinary portland cement (OPC) paste used as a reference was associated with the lower water and portlandite content found in HYC. Pseudo-plastic behaviour was observed at high temperatures in the loaded HYC in the tests conducted during exposure.


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