scholarly journals REUSED TYRE POLYMER FIBRE FOR FIRE-SPALLING MITIGATION

2016 ◽  
Author(s):  
Shan-Shan Huang ◽  
Harris Angelakopoulos ◽  
Kypros Pilakoutas ◽  
Ian Burgess
Keyword(s):  
Fresh Concrete ◽  
High Strength ◽  
Plain Concrete ◽  
Superior Performance ◽  
Polymer Fibre ◽  
Explosive Spalling ◽  
Polypropylene Fibres ◽  
Shrinkage Cracking ◽  
Plastic Shrinkage ◽  
The Eu

<p>Polypropylene fibres (PPF) are used in concrete principally to reduce plastic shrinkage cracking, but also to prevent explosive spalling of concrete exposed to fire. In the EU alone, an estimated 75,000 tonnes of virgin PPF are used each year. At the same time an estimated 63,000 tonnes of polymer fibres are recovered from end-of-life tyres, which are agglomerated and too contaminated with rubber to find any alternative use; currently these are mainly disposed of by incineration. The authors have initiated a study on the feasibility of reusing tyre polymer fibres in fresh concrete to mitigate fire-induced spalling. If successful, this will permit replacement of the virgin PPF currently used with a reused product of equal or superior performance. A preliminary experimental investigation is presented in this paper. High-strength concrete cubes/slabs have been tested under thermo-mechanical loading. This study has shown promising results; the specimens with the tyre polymer fibres have shown lower vulnerability to spalling than those of plain concrete.</p>

The effects of fibres on the plastic shrinkage cracking of high strength concrete

2002 ◽  
Vol 35 (3) ◽  
pp. 189-194 ◽  
Author(s):  
J. Branch ◽  
A. Rawling ◽  
D. J. Hannant ◽  
M. Mulheron
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Shrinkage Cracking ◽  
Strength Concrete ◽  
Plastic Shrinkage

scholarly journals ASSESSMENT OF MECHANICAL PROPERTIES OF HIGH STRENGTH CONCRETE (HSC) AFTER EXPOSURE TO HIGH TEMPERATURE

2018 ◽  
Vol 24 (2) ◽  
pp. 138-144 ◽  
Author(s):  
Tomasz DRZYMAŁA ◽  
Wioletta JACKIEWICZ-REK ◽  
Jerzy GAŁAJ ◽  
Ritoldas ŠUKYS
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Strength Concrete ◽  
High Performance Concrete ◽  
High Strength ◽  
Hardened Concrete ◽  
Explosive Spalling ◽  
Polypropylene Fibres ◽  
Strength Concrete ◽  
Temperature Conditions

There has been a tendency to design ever slender building construction using high strength concrete in recent years. Application of HSC is also growing in tunnel construction. One of the most important challenges is to control explosive spalling of concrete and the method recommended by Eurocode 2 (EN 1992-1-2:2008/NA:2010P) is addition of polypropylene fibres to the mix. The purpose of the research described in this paper was to evaluate the changes of mechanical properties of HSC exposed to the effect of high temperature. The tests were carried out on three types of high strength concrete: air-entrained concrete, polypropylene fibre-reinforced concrete and reference concrete having constant water/cement ratio. The properties of hardened concrete including compressive strength, tensile splitting strength, flexural strength and E-modulus were studied. The latter tests were carried out on both on concrete cured at 20 °C and concrete subjected to high-temperature conditions at 300 °C, 450 °C and 600 °C. The results enabled us to evaluate the effect of high-temperature conditions on the properties of high-performance concrete and compare the effectiveness of the two methods designed to improve the high-temperature performance of the concrete: addition of polypropylene fibres and entrainment of air.

scholarly journals Synergistic Interaction of Polypropylene Fibres in Latex Modified High Strength Concrete

2013 ◽  
Vol 59 (3) ◽  
pp. 321-335 ◽  
Author(s):  
S. Thirumurugan ◽  
A. Sivakumar
Keyword(s):  
Compressive Strength ◽  
Film Formation ◽  
High Strength ◽  
Plain Concrete ◽  
Relative Volume ◽  
Styrene Butadiene Rubber ◽  
Cement Matrix ◽  
Butadiene Rubber ◽  
Polypropylene Fibres ◽  
Styrene Butadiene

Abstract Synthetic polymer latexes, such as styrene-butadiene rubber (SBR) latex addition in Portland cement has gained wider acceptance in many applications in the construction industry. Polymer-modified cementitious systems seals the pores and micro cracks developed during hardening of the cement matrix, by dispersing a film of polymer phase throughout the concrete. A comprehensive set of experimental test were conducted for studying the compressive properties of SBR latex polymer with crimped polypropylene fibres at relative volume fractions of 0.1 and 0.3%. The results indicated that the addition of polypropylene fibre has little effect on the reduction in the workability of concrete composite containing fly ash and SBR Latex. Increase in polypropylene fibres upto 0.3% Vf showed increase in compressive strength upto 57.5MPa. The SBR concrete without fibre showed an increase in strength upto 20 % compared to plain concrete. Test results also indicated that the compressive strength was increased in SBR fibre concrete by means of an ordinary dry curing process than wet curing because of their excellent water retention due to polymer film formation around the cement grains. On the contrary the compressive strength reduces for SBR fibre concretes under wet curing compared to dry curing

THE USE OF POLYPROPYLENE FIBERS AGAINST PLASTIC SHRINKAGE CRACKING

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Hasan Nuri Turkmenoglu ◽  
Hakan Nuri Atahan ◽  
Cengiz Sengul
Keyword(s):  
Relative Humidity ◽  
Wind Velocity ◽  
Fresh Concrete ◽  
Polypropylene Fibers ◽  
Short Fibers ◽  
Shrinkage Cracking ◽  
Plastic Shrinkage ◽  
Concrete Temperature ◽  
Rate Of Evaporation

Plastic shrinkage cracking (PShC) occurs within a few hours after fresh concrete formed into the molds and it takes part on the surface of the concrete. When concrete formed into the molds, the aggregates settle because of the gravity and in contrast, water bleeds. If the rate of evaporation is higher than the rate of bleeding, surface of concrete starts to shrink. However, under the surface, the fresh concrete cannot shrink as much as the surface. Because of this condition, cracking occurs on the surface of concrete. In this respect, the quantity of PShC majorly depends on the temperature of concrete, temperature of air, rate of relative humidity and the wind velocity. Use of short fibers in concrete is one of the most effective ways to prevent concrete from PShC. The aim of this research was to evaluate the effect of polypropylene fibers having different geometries and content on PShC. For this purpose, the principles of ASTM C 1579 standard was considered. Results have shown that the use of polypropylene fibers in limiting PShC is obvious. Moreover, fibrillated fibers has shown better performance than monofilament fibers.

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