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Showing papers on "Mortar published in 2015"


Journal ArticleDOI
TL;DR: In this article, the transport properties of cement mortar with graphene nanoplatelet (GNP) were investigated experimentally in the presence of a low cost carbon-based nano-sheet, which was added to mortar at contents of 0, 2.5, 5.0 and 7.5%.

228 citations


Journal ArticleDOI
TL;DR: In this article, high compressive and flexural tensile strength of alkali activated fly ash geopolymer mortars were presented, where NaOH was used as alkali medium that provides high pH value.

223 citations


Journal ArticleDOI
TL;DR: In this article, a short dispersion route using Pluronic F-127 as a novel dispersing agent was used to develop carbon nanotube (CNT) reinforced cement composites.

218 citations


Journal ArticleDOI
TL;DR: In this article, the properties of mortars containing FRCA have been studied, including fresh properties, mechanical properties and interfacial transition zone (ITZ) microstructure.

207 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of adding graphene oxide (GO) to cement on its microstructure and mechanical strength was investigated, and it was shown that the addition of GO increases the viscosity, decreases the fluidity and shortens the setting time of the mortar.

200 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of carbon dioxide treatment of recycled concrete aggregate (RCA) on the performance of RCA and RCA mortar was investigated, and the results indicated that carbonation increased the apparent density, and reduced both water absorption and the crushing value of the RCA.

197 citations


Journal ArticleDOI
TL;DR: In this paper, the rheological properties of fresh, cement-based mortars modified with superabsorbent polymers (SAPs) were investigated for 90min by continuous flow rheometry.

187 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present an overview of the previous studies carried out on the use of high volume Class F FA as a partial replacement of cement in traditional paste/mortar/concrete mixtures based on Portland cement.
Abstract: Disposal of fly ash (FA) resulting from the combustion of coal-fired electric power stations is one of the major environmental challenges. This challenge continues to increase with increasing the amount of FA and decreasing the capacity of landfill space. Therefore, studies have been carried out to re-use high-volumes of fly ash (HVFA) as cement replacement in building materials. This paper presents an overview of the previous studies carried out on the use of high volume Class F FA as a partial replacement of cement in traditional paste/mortar/concrete mixtures based on Portland cement (PC). Fresh properties, mechanical properties, abrasion resistance, thermal properties, drying shrinkage, porosity, water absorption, sorptivity, chemical resistance, carbonation resistance and electrical resistivity of paste/mortar/concrete mixtures containing HVFA (⩾45%) as cement replacement have been reviewed. Furthermore, additives used to improve some properties of HVFA system have been reviewed.

181 citations


Journal ArticleDOI
TL;DR: In this paper, the use of recycled nylon fibers as tensile reinforcement of cementitious mortars was investigated, with the aim of assessing the resistance of such materials to chemical attacks, evaluating the workability of fresh mortar and the possible impacts of contaminants released by waste fishing nets into the environment.

154 citations


Journal ArticleDOI
TL;DR: In this paper, an experimental study on the tensile behaviour of reinforced concrete and masonry structures was presented, where various clamping methods and testing setups have been experimented and their effect on the results is discussed.
Abstract: Textile reinforcements applied with inorganic matrices are currently receiving great attention for strengthening reinforced concrete and masonry structures, especially when preservation criteria need to be fulfilled for safeguarding cultural heritage. As the development of mortar-based reinforcements is still at an early stage, their mechanical properties need to be investigated and standardized testing methodologies have to be defined. The paper presents an experimental study on the tensile behaviour of strengthening systems comprising two different textiles and five mortar matrices. Various clamping methods and testing setups have been experimented and their effect on the results is discussed. Monotonic and cyclic tests have been carried out to derive strength and stiffness, crack pattern, failure mode, and response stages under tension, which have been related to the mechanical properties and the layout of the matrix and the textile.

134 citations


Journal ArticleDOI
TL;DR: In this paper, the carbonation resistance of mortar and concrete is measured by the ratio between water added during production and the amount of reactive CaO present in the binder (w/CaO active).
Abstract: When cement with mineral additions is employed, the carbonation resistance of mortar and concrete may be decreased. In this study, mortars containing mineral additions are exposed both to accelerated carbonation (1% and 4% CO2) and to natural carbonation. Additionally, concrete mixtures produced with different cements, water-to-cement ratios and paste volumes are exposed to natural carbonation. The comparison of the carbonation coefficients determined in the different exposure conditions indicates that mortar and concrete containing slag and microsilica underperform in the accelerated carbonation test compared to field conditions. The carbonation resistance in mortar and concrete is mainly governed by the CO2 buffer capacity per volume of cement paste. It can be expressed by the ratio between water added during production and the amount of reactive CaO present in the binder (w/CaOreactive) resulting in a novel parameter to assess carbonation resistance of mortar and concrete containing mineral additions.

Journal ArticleDOI
TL;DR: In this article, the effect of nano-silica addition on mechanical, durability and microstructure characteristics of paste, mortar and concrete is summarized and the future trend/potential and implication of nano silica in cement-based materials is discussed.
Abstract: The research nowadays is mainly focusing on the basic science of cementitious material at nano/atomic level. Further, researchers are continuing to improve the durability and sustainability of concrete and have realized significant increment in mechanical properties of cementitious materials by incorporating nano-silica. The review paper summarizes the effect of nano-silica addition on mechanical, durability and microstructure characteristics of paste, mortar and concrete. It provides the current development of application of nano-silica in paste, mortar and concrete. Finally, the future trend/potential and implication of nano-silica in cement-based materials is discussed.

Journal ArticleDOI
TL;DR: In this article, the properties of cement-based mortars with vermiculite and silica fume were investigated at ambient and elevated temperatures, and the results indicated that expanded vermiculate aggregate is a good fire resistant material.

Journal ArticleDOI
TL;DR: In this paper, the uniaxial compressive strength, splitting tensile strength and water absorption ratio of microbial mortars treated with three different calcium sources (CaCl2, Ca(CH3COO)2 and Ca(NO3)2) were investigated.

Journal ArticleDOI
TL;DR: In this article, the analysis of the bond between a cement-based fiber reinforced strengthening material and the concrete substrate is presented and discussed, and a comparison between experimental results and theoretical predictions of bond-slip law PBO-FRCM-to-concrete is made and discussed.
Abstract: The paper is devoted to the analysis, both experimental and theoretically, of the bond between a cement based fiber reinforced strengthening material and the concrete substrate. Results of tests on concrete specimens strengthened with the PBO-FRCM system, made by PBO (short of Polypara-phenilene-benzo-bisthiazole) fiber meshes embedded into a cementitious mortar (FRCM, Fabric Reinforced Cementitious Mortar), are presented and discussed. Tests were carried out varying both the bond length, the amount of the strengthening system and the service temperature. Obtained results furnish useful information (i) to determine the loss of bond between the PBO-FRCM system and the concrete, (ii) to define the failure modes and (iii) to evaluate both the influence of environmental conditions (service temperature) and mechanical and geometrical parameters on the loss of bond PBO-FRCM-to-concrete. Test results were, then, utilized to calibrate a local bond-slip relation. A comparison between experimental results and theoretical predictions of the bond-slip law PBO-FRCM-to-concrete is, finally, presented and discussed.

Journal ArticleDOI
TL;DR: In this article, the authors analyzed the maximum feasible replacement ratio of natural sand by recycled sand from masonry waste for mortar production and found that 50% can be achieved in mortar for indoor use, although specific studies to increase the workable life and decrease the shrinkage should be carried out before use.

Journal ArticleDOI
TL;DR: In this article, experimental investigations of aerogel-incorporated mortar (AIM) with up to 80 VOLUME 7, 2019 were conducted using a reduced ultra-high performance concrete (UHPC) recipe.

Journal ArticleDOI
TL;DR: In this article, the effect of chemical as well as mechanical treatment approaches in reducing the mortar attached to aggregate has been compared, and six series of concrete mixtures were prepared using natural aggregate, recycled aggregates, recycled aggregate treated with HCl and H2SO4, and recycled aggregate obtained after scrubbing treatment, and heating and scrubbing.
Abstract: With the rise in the adoption of recycled aggregate for construction, investigation on ways to improve its quality has been wide spread. The major factor that affects the quality of recycled aggregate is the large amount of cement mortar that remains on the surface of the recycled aggregate. This attached mortar results in higher porosity, higher water absorption rates, and thus a weaker interfacial zone between new cement mortar and aggregates, weakening the strength and mechanical performance of concrete made from recycled aggregate. This paper attempts to compare the effect of chemical as well as mechanical treatment approaches in reducing the mortar attached to aggregate. Six series of concrete mixtures are prepared using natural aggregate, recycled aggregate, recycled aggregate treated with HCl and H2SO4, recycled aggregate obtained after scrubbing treatment, and heating and scrubbing treatment. The physical and mechanical properties of these aggregates, and their strength and performance of ...

Journal ArticleDOI
TL;DR: In this paper, the durability properties of self-compacting mortar (SCM) incorporating nano-SiO 2, nano-Fe 2 O 3 and nano-CuO were experimentally compared with that of plain mortar.

Journal ArticleDOI
TL;DR: In this paper, the current state of knowledge on the durability of concrete and mortar made from the above mentioned pozzolans associated with AAB is reviewed and a few potential studies have been suggested for the future research.

Journal ArticleDOI
TL;DR: In this paper, the workability, mechanical and microstructure properties of mortar containing four kinds of nanoparticles were evaluated, and these four kinds were nano-Al 2 O 3, nano-SiO 2, nano-TiO 2 and nano-ZnO respectively.

Journal ArticleDOI
TL;DR: In this article, the effects of adding various concentrations, sources and compositions of ground red clay brick waste (RCBW) on the properties of fresh and hardened pastes and mortars of alkali-activated slag were investigated.

Journal ArticleDOI
TL;DR: In this paper, the performance of a two-stage approach of using limestone powder (LP) pre-coated crumb rubber and silica fume (SF) to enhance the rubberized cement mortar was investigated.

Journal ArticleDOI
TL;DR: In this article, the results of diagonal compression tests were collected to compare the in-plane behavior of unreinforced masonry and of masonry strengthen with a GFRP reinforced mortar coating.

Journal ArticleDOI
TL;DR: In this paper, an experimental study was conducted to evaluate the properties in the fresh (fluidity and flowability) and hardened properties (bulk density, porosity/water absorption, flexural and compressive strength and elastic modulus) of self-compacting mortars (SCMs) with the partial and total substitution of sand (S) by seashells (Sh) crushed at different ratio (Sh/S = 0, 10, 20, 50% and 100%) by weight.

Journal ArticleDOI
TL;DR: In this paper, an experimental study of the effects of cement type, ground granulated blast furnace slag (GGBFS) fineness, curing age, and use of shrinkage reducing admixture (SRA) on the drying shrinkage property and microstructure in mortar is presented.

Journal ArticleDOI
TL;DR: In this article, a graphite-modified phase change material (GM-MPCM) was incorporated into the cement mortar to develop a type of cement mortar with both high heat storage efficiency and considerable mechanical strength.

Journal ArticleDOI
TL;DR: In this article, the potential of blended lime-cement mortars to substitute natural hydraulic lime mortars as repair mortars in restoration works was analyzed, since the availability of hydraulic lime is limited in many countries, unlike cement.

Journal ArticleDOI
TL;DR: In this article, the removal of elemental aluminium, sulphate and harmful organics from two types of MSWI ash samples, the sand sized (0.1-2mm) fraction of bottom ash from a grate furnace (SF), and boiler and fly ash from the fluidized bed incinerator (BFA), were done to use as fine aggregates in preparation of cement mortar.

Journal ArticleDOI
P. Gomathi1, A. Sivakumar1
TL;DR: In this paper, the authors investigated the mechanical performance of concrete incorporating fly ash based light weight aggregates and found that the composite strength of concrete was improved when the ratio of volume of coarse aggregate to volume of cement mortar is lower.