civil engineering

1. NAME- IMRAN ALI (110107076)
POLYMER MODIFIED
CONCRETE

2. Introduction
 The concept of polymer modification for cement
mortar and concrete is not so new, as in 1923 the first
patent of the concept had already been issued to
Cresson
 (1)This patent refers to paving materials with natural
rubber latexes, and cement was used as a filler. The
first patent with the present concept of polymer
modification was published by Lefebure
 (2)In 1924. Since then, considerable research and
development of polymer modification for cement,
mortar and concrete have been conducted in various
countries for 70 years or more. As a result, many
effective polymer modification systems for cement
mortar and concrete have been developed, and
currently are used in various applications in the
construction industry.

3. Polymer modification of concrete
 To produce polymer-modified mortar and
concrete, mostly polymers in dispersion (latex or
emulsion) form are added to ordinary cement
mortar and concrete during mixing. Polymer-
modified mortar and concrete have considerable
attraction because their process technology is
very similar to that of ordinary cement mortar and
concrete.
 The polymer dispersions widely used are styrene-
butadiene rubber (SBR)latex, ethylene-vinyl
acetate (EVA), and polyacrylic ester (PAE)

4. SBR Modified Concrete
 SBR Polymer is the most widely used in concrete
shows the chemical structure of Styrene
butadiene Rubber latexes. Co-polymers of
butidine with styrene(styrene-butadine rubber
(SBR)), are a group of large-volume synthetic
rubbers
 High adhesion occurs between the polymer films
that form and cement hydrates .This action gives
less strain compared to ordinary concrete and
improves the properties of concrete such as
flexural and compressive strength and gives also
a higher durability

6. cost
 Various ingredients with their cost to produce 1
Kg of polymer have been ,It can be , that the total
cost to produce 1 Kg of polymer combination of
ratio 4:4:1 came to be rs 10/Kg whereas the cost
of cheapest polymer available in the market
varies from rs 40 to 100/Kg. Thus substantial cost
saving can be achieved by using the said polymer
combinations developed during the

7. Tensile and compressive strength of
PMC
Tensile and compressive strengths of ordinary
concrete and polymer modified concrete using
varying proportions of PVA emulsion and subsidiary
Chemical that the polymer alteration resulted in an
increase in the flexural tensile and compressive
strength of the ordinary concrete. Highest tensile
strength i.e., 1,200 Psi with corresponding highest
compressive strength 12,400 Psi was achieved in
polymer-modified concrete with the ratio of 4:4:1 by
weight of PVA, AG and SBR, respectively

9. ADVANTAGES OF PMC
 High performance ,low cost , great convenience ,
and excellent durability.
 Rupture strength, tensile splitting strength, bond
strength and impermeability is higher by 28.6%,
37.5%, 55.3% and 77.2% than ordinary concrete
respectively
 Smooth surface finishing.
 Water proofing

10. Applications of PMC
 The uses of SFC over the past thirty years have
been so varied and so widespread, that it is
difficult to categorize them. The most common
applications are pavements, tunnel linings,
pavements and slabs, shortcrete and now
shortcrete also containing silica fume, airport
pavements, bridge deck slab repairs, and so on.

11. Conclusion
 1. SBR Addition of steel to a concrete will improve both its
flexural and compressive strength. The strengths increase
significantly with fiber content.
 2. The flexural strength increases greatly when containing 3-
10 wt.% SBR. The optimal use of SBR is 5 wt.%, which
achieves the highest flexural strength. However, the
compressive strength may decrease with the addition arrives
10 wt.%, a 16% reduction is observed.
 3.Polymer films are observed in concretes when incorporating
5 or 10 wt.% SBR, and act as bridges across pores and
cracks. Moreover, the polymer films in concrete incorporating
10 wt.% SBR are thicker and more coherent.
 4. The pore size distribution curves of specimens exhibit at
least two peaks, which locate in the ranges of 5-20 nm and
50-1000 nm, respectively. Higher addition of SBR leads to a
larger peak magnitude in the range of 50-1000 nm.