Utilization of Poly(Polyvinyl Alcohol-g-2-Ethylhexyl Acrylate) as Admixture for Mortar
Corresponding email: lyazzat_bk2019@mail.ru
Published at : 21 Apr 2020
Volume : IJtech
Vol 11, No 2 (2020)
DOI : https://doi.org/10.14716/ijtech.v11i2.3927
Bekbayeva, L., Negim, E., Gulzhakhan, Y., Ganjian, E., 2020. Utilization of Poly(Polyvinyl Alcohol-g-2-Ethylhexyl Acrylate) as Admixture for Mortar. International Journal of Technology. Volume 11(2), pp. 259-268
| Lyazzat Bekbayeva | School of Chemical and Biological Technologies, Satbayev University, 22 Satpayev Street, 050013 Almaty, Kazakhstan |
| El-Sayed Negim | School of Chemical Engineering, Kazakh-British Technical University, 106 Walikhanov Street, Almaty, 050010, Kazakhstan |
| Yeligbayeva Gulzhakhan | School of Chemical and Biological Technologies, Satbayev University, 22 Satpayev Street, 050013 Almaty, Kazakhstan |
| Eshmaiel Ganjian | School of Energy, Construction and Environment, Faculty of Engineering, Environment & Computing, Sir John Laing Building, JL138, Coventry University, Coventry, CV1 2HF |
We
investigated the physico-mechanical properties of mortar mixed with copolymers
based on polyvinyl alcohol (PVA) and 2-ethylhexyl acrylate (2-EHA) and
synthesized by grafting using ammonium persulfate (APS) as an initiator.
Increasing the amount of 2-EHA in the copolymer from 4% to 8% reduced the
water/cement (W/C) ratio, the initial and final setting times, and the water
absorption of mortar, while it increased its compressive strength.
Admixture; Cement; Copolymer; Mortar; PVA; Workability
A number
of researchers have investigated concrete admixtures based on polymers to
improve different properties of concrete, such as
workability, setting time, and compressive strength (Akers, 2001; Duggal, 2008; Plank and
Sachsenhauser, 2009). These admixtures are used in various latexes, powders, and water-based and epoxy resins (Liao et al., 2006; Zingg et al., 2009) to
enhance the physical and mechanical characteristics of cement, mortar, and concrete (Ashadi et al., 2015). The main mechanism of polymer
addition to concrete is the formation of a thin film on the surface of the
cement aggregate, as well as pores, which exhibit good
adhesion and promote compressive strength and an increase in bending (Sakai and Sugita, 1995; Allahverdi et al., 2010). PVA
is a hydrophile polymer often used in industrial
applications as a binding agent, modifier, and aggregate surface pretreatment and fiber reinforcement agent in
cement-based composite substances (Kim and
Robertson, 1998; Kim et al., 1999; Niken et al., 2017). Generally, adding PVA to
cement and cement-based materials, such as mortar and concrete, in small amounts improves their properties (Kim et al., 1999; Singh and
Rai, 2001). Singh and Rai (2001)
found that the incorporation
of 3.0-wt.% PVA to cement pastes increased their
strength and decreased their porosity. Furthermore,
adding 1.0-wt.% PVA increased the flexural strength of cement pastes, as observed by Knapen and Van Gemert (2015). On
the other hand, Sathidevi
and Pushpendra (2017) demonstrated that the compressive
strength of cement
pastes as observed
by Knapen and Van Gemert (2015). On the
other hand, Sathidevi and Pushpendra
Negim et al. (2014, 2016) investigated the physico-mechanical properties of mortar containing the following cosurfactants: 2-wt.% dodecyl benzene sodium sulfonate (DBSS) and either
1.5-wt.%
PVA or 1.5-wt.% polyoxyethylene glycol
monomethyl ether (POE) as an air
entraining agent. Additionally, the latex
copolymers: styrene/butyl methacrylate (St/BuMA), styrene/methyl methacrylate
(St/MMA), styrene/glycidyl methacrylate (St/GMA), and
styrene/butyl acrylate (St/BuA) were prepared by emulsion in the presence of
the abovementioned cosurfactants. The study investigated the workability, W/C ratio, initial and final setting time, water absorption, compressive strength, and combined
water. The conclusion was that the
latexes enhanced the paste and mortar properties compared with
the cosurfactants.
In this
context, the present work was designed to study the effect of grafted
copolymers (PVA-g-2-EHA) on the following
physico-mechanical properties of mortar: W/C ratio, workability, water absorption, and
compressive strength, as well as to modify the workability of mortar mixes.
We investigated the physical and mechanical properties of mortar
premixed with copolymers. The results show that the W/C ratio is inversely
proportional to the 2-EHA concentration; i.e., the grafted copolymer M1 acts as
a water-reducing agent. The flow table test indicated that the workability of
mortars also enhances by 60% because of the grafted copolymer acting as
surface-active agent. Furthermore, mixing grafted copolymer with mortar
resulted in mortar setting times inversely proportional with the 2-EHA content.
Modified mortar also exhibited a higher compressive strength than the reference
mortar, while the water absorption decreased with increasing the amount of
2-EHA in the copolymers. This effect is attributed to the formation of polymer
films that may have filled the pores, reduced the water absorption, and
improved the mortar strength.
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