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Development of Buildings and Structures of Enhanced Durability
Published in V.Sh. Barbakadze, V.V. Kozlov, V.G. Mikul’skii, I.I. Nikolov, Durability of Building Structures and Constructions from Composite Materials, 2020
V.Sh. Barbakadze, V.V. Kozlov, V.G. Mikul’skii, I.I. Nikolov
The structure was designed with a minimum cross-section, keeping in mind the enhanced bearing capacity of the block. It is much more cost effective due to reduced material consumption and consequently lower cost, since the cost of a polymer concrete structure is governed mainly by the consumption of polymer concrete rather than its reinforcement.
Mixture Experiments
Published in John Lawson, Design and Analysis of Experiments with R, 2014
Piepel’s (1988) FORTRAN code to generate the vertices and centroids of a multi-constrained experimental region has been incorporated into the Xvert function in the mixexp package. To illustrate the use of this function, consider a problem studied by Barbuta and Lepadatu (2008). They investigated mechanical properties such as compressive strength, flexural strength, and adhesion stress of polymer concrete. Polymer concrete (PC) has many uses: precast components for buildings, bridge panels, repair of structural members, waterproofing, and decorative overlay of pavements. Polymer concrete is formed by binding aggregates together with a resin that reacts with a hardener. The relatively high cost of PC led Barbuta and Lepadatu (2008) to study ways of reducing the dosage of polymer in the mix without diminishing the mechanical properties. The mixture components they studied were x1 :Epoxy resin, x2: Silica Fume (SUF), x3 :Aggregate Sort I, and x4: Aggregate Sort II. Constraints on the mixture components are shown in Equation (11.19) below.
Breaking the Asphalt code – Polyurethane flexible plug expansion joint
Published in Nigel Powers, Dan M. Frangopol, Riadh Al-Mahaidi, Colin Caprani, Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2018
C. Sarmiento, G. Pope, S.N. Kazi
The following shows and describes the installation process: A block-out is prepared by machine cutting the road surfacing along markings of predetermined width and depth. The road surface is cut down to a firm substructure (concrete or any stable sublayer) to which the polymer concrete can bond to. (Figure 5)The block-out is then cleaned and air-blasted to ensure PU joint materials will bond properly. (Figure 6)Where required, the bridge deck/road surface waterproofing membrane can be extended into the block-out (Figure 7)In the case of rehabilitation works where an old joint is removed and there is an absence of appropriate surface, formwork or a sheet of Styrofoam is then placed in the bridge gap to retain the polymer concrete base. (Figure 8)A suitable primer is then applied before the polymer concrete is poured. The polymer concrete cures naturally at ambient temperature. It cures in approximately 1 hour @ 15C. The perforated angles are then anchored on both sides and the bridge plate is placed over the joint gap. (Figure 9)After all the above works are done and verified to be in compliance with all requirements, the PU material is then poured, trowelled and levelled precisely to match the level of the connecting road surface. (Figure 10 & 11)
A lab study to develop polyurethane concrete for bridge deck pavement
Published in International Journal of Pavement Engineering, 2022
Zhiqiang Jiang, Chenhao Tang, Jian Yang, Yujing You, Zhongda Lv
Polymer concrete is known to exhibit viscoelastic properties, which are largely dependent on temperature. In the real field, temperature varies throughout the day. At some part of the day the pavement experiences contraction due to low temperature and some part of the day the pavement experiences expansion due to high temperature. To evaluate thermally induced strains and resulting stresses, the coefficient of thermal contraction value was determined. The coefficient of thermal contraction values calculated in the range of −30°C to −10°C, −10°C to 10°C, and 10°C to 30°C were 25.0 ± 3.8*10−6 /°C, 26.4 ± 3.4 *10−6 /°C, 33.5 ± 2.8 *10−6 /°C respectively (Figure 6). The average coefficient value in the whole range of −30°C to 30°C was 28.2*10−6 /°C. The values were bigger than that of epoxy asphalt concrete (17.4*10−6 /°C) (Chen et al.2013), and smaller than that of SMA concrete (35–40*10−6 /°C) (Teguedi et al.2017) and asphalt concrete (26.4–37 *10−6 /°C) (Islam and Tarefder 2015, Hossain et al.2016).
Plastic hinge integration methods for cyclic analysis of polymer concrete-filled fiber reinforced polymer tube beams
Published in Mechanics of Advanced Materials and Structures, 2020
Vahid Toufigh, Hamid Saadatmanesh, Ali Arzeytoon
Applying polymer concrete (PC) is growing very rapidly in many constructions. The strength and durability of polymer concrete is much higher compared with that of cement-based materials. The fast curing time of this product is another important effective factor in many construction applications. Only a few minutes or hours is sufficient for curing polymer concrete while it takes a few days or weeks concerning cement-based materials. Several researches have been performed on the basic material characteristics of PC in comparison to those of ordinary portland cement concrete [12]–[16]. According to the results, presented in the literature, polymer concrete is relatively stronger in compression and tension, comparing to those of portland cement concrete. Moreover, it is fully cured only up to three days [17–18]. The objectives of this study are to study the cyclic behavior of confined polymer concrete beam/pile with sleeve fiber carbon and confinement effectiveness of FRP tubes for specimens of different polymer concrete strength.
Behavior of polymer concrete beam/pile confined with CFRP sleeves
Published in Mechanics of Advanced Materials and Structures, 2019
Vahid Toufigh, Vahab Toufigh, Hamid Saadatmanesh, Saeed Ahmari, Ehsan Kabiri
Ordinary Portland cement concrete (OPCC) is one of the most popular construction materials regarding many desirable properties. The main drawbacks of OPCC are long curing period, low tensile and flexural strength, cracking due to shrinkage and degradation. Different approaches have been used to address these issues; however, there is no single solution. One of the approaches is to replace water–cement content with epoxy resin leading to introduce a composite material known as polymer concrete (PC) [1]. Several researches have been performed to investigate the basic material characteristics of PC, which reveal that it has relatively high durability, low permeability and superior resistance to chemical substances in corrosive environment in comparison to OPCC [2]–[6]. Investigations also demonstrate that PC is relatively stronger in compression and tension than OPCC and it takes only up to three days to be fully cured [7], [8].