Effect of filler addition and strain rate on the compressive strength of silica styrene-butadiene rubber-filled epoxy composites

2011 ◽  
Vol 51 (6) ◽  
pp. 1130-1136 ◽  
Author(s):  
Prakash Chandra Gope ◽  
Vinay Kumar Singh
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Epoxy Composites ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene

Green Strength of Carbon-Black-Filled Styrene—Butadiene Rubber

1992 ◽  
Vol 65 (2) ◽  
pp. 475-487 ◽  
Author(s):  
P. L. Cho ◽  
G. R. Hamed
Keyword(s):  
Yield Strength ◽  
Strain Rate ◽  
High Yield ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Green Strength ◽  
Strain And Strain Rate ◽  
Furnace Black ◽  
Reduced Rate ◽  
Styrene Butadiene

Abstract The green strengths of a gum SBR and two black-filled samples, at twenty-three volume percent filler, have been determined at various strain rates and temperatures. At higher temperatures, all samples exhibit yielding, followed by strain-softening. The gum exhibits this type of behavior down to −20°C, whereas, filled specimens undergo strain hardening at this temperature. Yield strength increases with decreasing temperature or increasing rate, indicating that it is largely controlled by chain mobility. Yield strengths at various temperatures may be shifted along the rate axis to form mastercurves. The dependence of yield stress on reduced rate is similar for the gum and the composition filled with the large-sized thermal black (N990). Stiffening is reasonably well accounted for by strain and strain-rate amplification, using the well-known Guth—Gold amplification factor. At low reduced rates, the extent of stiffening is substantially greater for samples filled with the much finer furnace black, N110. Unlike with the N990, SBR filled with N110 forms a coherent bound-rubber gel. This provides a strong resistance to deformation (beyond simple strain or strain-rate amplification) and results in high yield strength. At low temperatures, perhaps when the magnitude of chain—chain and chain—filler internal friction is comparable, the effect of filler size is greatly diminished.

Effect of Finite Extensibility on the Viscoelastic Properties of a Styrene-Butadiene Rubber Vulcanizate in Simple Tensile Deformations up to Rupture

1970 ◽  
Vol 43 (4) ◽  
pp. 714-734
Author(s):  
T. L. Smith ◽  
R. A. Dickie
Keyword(s):  
Strain Rate ◽  
Constant Strain Rate ◽  
Shift Factor ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Stress Strain ◽  
Temperature Function ◽  
Extension Ratio ◽  
Styrene Butadiene ◽  
Maximum Extensibility

Abstract Stress-strain and rupture data were determined on an unfilled styrene-butadiene vulcanizate at temperatures from −45 to 35° C and at extension rates from 0.0096 to 9.6 min−1. The data were represented by four functions: (1) the well-known temperature function (shift factor) aT; (2) the constant-strain-rate modulus, F (t, T) reduced to temperature T0 and time t/aT, i.e., T0F (t/aT)/T (3) the time-dependent maximum extensibility λm (t/aT); and (4) a function Ω(χ) where χ=(λ−1)λm0/λm, in which λ is the extension ratio and λm0 is the maximum extensibility under equilibrium conditions. The constant-strain-rate modulus characterizes the stress-time response to a constant extension rate at small strains, within the range of linear response; λm is a material parameter needed to represent the response at large λ; and Ω(χ) represents the stress-strain curve of the material in a reference state of unit modulus and λm=λm0. The shift factor aT was found to be sensibly independent of extension. At all values of t/aT for which the maximum extensibility is time-independent, the relaxation rate was also found to be independent of λ. These observations indicate that the monomeric friction coefficient is strain-independent over the ranges of T and λ covered in the present study. It was found that λm0=8.6 and that the largest extension ratio at break (λb)max is 7.3. Thus, rupture always occurs before the network is fully extended.

scholarly journals Strength and Durability of Styrene –Butadiene Latex Modified Concrete with Silica Fume

2020 ◽  
Vol 9 (5) ◽  
pp. 2119-2125
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Silica Fume ◽  
Chloride Ion ◽  
Polymer Binder ◽  
Latex Film ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Binder Ratio ◽  
Styrene Butadiene

This paper discussed the properties of styrene butadiene rubber (SBR) latex modified concrete. The latex modified concrete using SBR latex were prepared with various polymer-binderratios and tested for compressive strength, flexure strength, elastic modulus and rapid chloride penetration test. Latex contents were varied as 5, 10 and 15 percentages by mass of binder (cement and silica fume). The effect of the polymer-binder ratio on the properties of latex modified concrete was examined. It was concluded from the test results that the compressive strength and elastic modulus decrease with polymer binder ratio and flexural strength increasing with polymer binder ratio. Addition of latex reduces the chloride ion penetration due to latex film formation..

scholarly journals Fresh and Hardened Properties of Styrene Butadiene Rubber (SBR) Modified Concrete

2020 ◽  
Vol 5 (4) ◽  
pp. 457-461
Author(s):  
Muhammad Ahmed Qadri ◽  
Huzaifah Hameed ◽  
Osama Bhutta
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Total Porosity ◽  
Lower Percentage ◽  
Partial Replacement ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Chloride Induced Corrosion ◽  
Hardened Properties ◽  
Styrene Butadiene

The durability of concrete has been studied ever since it was first used. Researchers have incorporated several materials to make concrete strong and durable. This research focuses on the infusion of styrene butadiene rubber polymer (SBR) as a partial replacement of cement and studies its effects on fresh and hardened properties of concrete. Samples were prepared using partial replacement of SBR in proportions of 0%, 5%, 10% and 20%. Results showed that the fresh density of concrete decreased with the addition of SBR whereas the trends of workability showed an increase with cement replacement. Compressive strength increased at lower percentage replacements however the flexural and tensile strength increased till 15% SBR addition after which it decreased. The total porosity in terms of water absorption decreased which makes SBR modified concrete feasible for concretes exposed to moist conditions and the decreased porosity would increase its durability against chloride induced corrosion.

scholarly journals Enhancing the Compressive Strength and Density of Cement Mortar by the Addition of Different Alignments of Glass Fibers and Styrene Butadiene Rubber

2017 ◽  
Vol 13 (3) ◽  
pp. 108-119
Author(s):  
Mustafa M. Hamza ◽  
Besma M. Fahad
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Glass Fibers ◽  
Control Sample ◽  
Styrene Butadiene Rubber ◽  
Hydration Reaction ◽  
Butadiene Rubber ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Styrene Butadiene

Abstract In the field of construction materials the glass reinforced mortar and Styrene Butadiene mortar are modern composite materials. This study experimentally investigated the effect of addition of randomly dispersed glass fibers and layered glass fibers on density and compressive strength of mortar with and without the presence of Styrene Butadiene Rubber (SBR). Mixtures of 1:2 cement/sand ratio and 0.5 water/cement ratio were prepared for making mortar. The glass fibers were added by two manners, layers and random with weight percentages of (0.54, 0.76, 1.1 and 1.42). The specimens were divided into two series: glass-fiber reinforced mortar without SBR and glass-fiber reinforced mortar with 7% SBR of mixture water. All specimens were tested after curing for 7 and 28 days, glass-fiber reinforced mortar exhibited better properties than control mortar in improvement of compressive strength and lowering the density after curing for 28 days due to the completion of cement hydration reaction.. For compressive strength the best results were achieved with 1.42 wt.% layers glass-fiber reinforced mortar with 7% SBR which gave 41.56 MPa. On the other hand, the addition of 1.42 wt.% random glass-fiber without SBR addition caused the beast reduction in density by 10.6% and produced lighter structure than control sample. Keywords: Random glass fibers , Glass fibers layers, SBR, compressive strength, density.  

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

scholarly journals Rheological, mechanical, and abrasion characteristics of polymer-modified cement mortar and concrete

2020 ◽  
Vol 47 (11) ◽  
pp. 1226-1237
Author(s):  
Changjun Zhou ◽  
Liangliang Chen ◽  
Shaopeng Zheng ◽  
Yunxi Xu ◽  
Decheng Feng
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Abrasion Resistance ◽  
Cement Mortar ◽  
Concrete Pavement ◽  
Styrene Butadiene Rubber ◽  
Hardened Cement ◽  
Butadiene Rubber ◽  
Polymer Modified Concrete ◽  
Styrene Butadiene

The settlement of fresh concrete or improper operation during construction usually makes the water to cement (w/c) ratio of the cement mortar on the concrete pavement surface higher than designed, which may influence the abrasion resistance of concrete pavement. This study firstly tried to establish relationships between abrasion of hardened cement mortar and rheological characteristics of fresh cement mortar in the laboratory. Secondly, a polymer-modified cement mortar was developed with carboxyl styrene butadiene rubber latex added to the cement mortar. Its rheological properties in mixing, mechanical properties, and abrasion were investigated. It is found that the polymer-modified cement mortar has a much better abrasion resistance and flexural strength while lower compressive strength than cement mortar. A stronger correlation was observed between flexural strength rather than compressive strength and abrasion resistance of cement mortar. The proposed polymer-modified concrete also exhibited good abrasion resistance.

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