Showing papers on "Mortar published in 2018"
TL;DR: In this paper, the tensile strength and elongation of the UHP-ECC achieved were 20 MPa and 8.7% respectively, which combines the strain-hardening and multiple crack characteristics and the high strength of mortar matrix.
322 citations
TL;DR: In this paper, the effect of RCA to concrete and a treatment method utilized to improve the properties of the RCA by reducing the amount of the adhered mortar, and therefore improving the mechanical properties and durability of RAC.
294 citations
TL;DR: In this paper, the properties of the geopolymer mortars including fresh performance (workability, setting time, and temperature of fresh mortar), physical properties, mechanical properties (compressive strength, tensile strength, elastic properties, flexural performance, bonding behavior, and fracture behavior), durability properties (acid resistance, resistance to elevated temperature, frost resistance, water absorption, and shrinkage properties) and microstructure analysis.
Abstract: Geopolymer mortar refers to the mortar manufactured with sand and geopolymer, which is composed by the base materials containing affluent aluminium and silicon that was activated by adopting alkaline solution to serve as a binder. The investigation of the properties and application of the geopolymer mortar has attracted more and more attention of the researchers and cement based industries because of its sustainability advantages. This study reviews the properties of the geopolymer mortars including fresh performance (workability, setting time, and temperature of fresh mortar), physical properties, mechanical properties (compressive strength, tensile strength, elastic properties, flexural performance, bonding behavior, and fracture behavior), durability properties (acid resistance, resistance to elevated temperature, frost resistance, water absorption, and shrinkage properties) and microstructure analysis. This study also reviews the properties of different types of geopolymer mortars prepared using various source materials as base materials. The current study results indicate that the geopolymer mortar has exhibited significant feasibility and application prospect to be used as an environmental friendly building material, which may be an appropriate replacement to the traditional cement mortar in the future.
242 citations
TL;DR: It is suggested that biochar from food waste and mixed wood saw dust has the potential to be successfully deployed as additive in cement mortar, which would also promote waste recycling, and sequester high volume carbon in civil infrastructure.
180 citations
TL;DR: In this article, the effect of fresh biochar and biochar saturated with carbon dioxide a priori on the setting time, mechanical strength and permeability of cement mortar was evaluated, and the experimental results suggested that biochar addition can impart ductility to mortar under flexure, although flexural strength was not significantly influenced.
Abstract: Biochar is widely considered as effective way of sequestering carbon dioxide. The possibility of using it to enhance the mechanical strength and reduce permeability of cement mortar is explored in this study. The effect of fresh biochar and biochar saturated with carbon dioxide a priori on the setting time, mechanical strength and permeability of cement mortar was evaluated. The biochar was prepared from mixed wood saw dust at 300 °C and added to mortar during mixing at 2% by weight of cement. It was found that addition of fresh biochar and saturated biochar reduce initial setting time and significantly improve early compressive strength of mortar. The experimental results suggested that biochar addition can impart ductility to mortar under flexure, although flexural strength was not significantly influenced. Water penetration and sorptivity of mortar was significantly reduced due to addition of biochar, which indicate higher impermeability in biochar added mortar. However, it is found that addition of fresh biochar offers significantly higher mechanical strength and improved permeability compared to biochar saturated with carbon dioxide. These results suggest that biochar has the potential to be successfully deployed as a carbon sequestering admixture in concrete constructions that also provides a way to waste recycling.
168 citations
TL;DR: In this paper, the authors examined if fast-dissolving solid synthetic sodium metasilicate could be replaced by a combination of sodium hydroxide and slow dissolving silica derived from rice husk ash or microsilica in the preparation of one-part alkali-activated blast furnace slag mortar.
148 citations
TL;DR: In this article, important durability characteristics of concrete, including the chloride ion penetration, electrical resistivity, water penetration, water absorption, the pore size distribution, the carbonation, the sulfate resistance, frost resistance, shrinkage, and thermal properties were explored.
143 citations
TL;DR: In this paper, the intrinsic properties of recycled coarse aggregates (RC) associated with bonded mortar were modified with two different pretreatment techniques viz-a-viz HCl pretreatment and Na2SO4 pretreatment, while maintaining a fixed aggregate-to-solution ratio of 1:4.5.
134 citations
TL;DR: In view of the significance of chopped basalt fibers (CBF) for mortar strengthening, the present study elaborates the application of CBF for mortar design as discussed by the authors, the CBF manufacturing, the engineering properties and relevant advantages of its application are elaborated in the study.
122 citations
TL;DR: In this article, the workability, compressive and flexural strength, and fire resistance of an alkali activated cement (AAC) mortar with waste soda-lime-silica glass was investigated.
118 citations
TL;DR: In this paper, the authors explored the effect of pre-soaked biochar on strength and permeability of cement mortar, subject to moist curing and air curing respectively, and found that the internal curing efficiency was higher compared to other mixes, which suggests that it can be a potential curing material for cement mortar.
TL;DR: In this paper, the authors explored the influence of biochar, prepared from mixed wood saw dust, on strength, elastic modulus, drying shrinkage and permeability of cement mortar.
TL;DR: In this paper, marble powder is used as a substitute of river sand in cement mortars to reduce the burden on landfills and therefore help the marble stone industry to be more sustainable.
TL;DR: In this article, the feasibility of utilizing waste generated from cutting and finishing of granite blocks as a replacement of fine aggregate in mortar mixes was investigated and it was observed that water requirement reduces by 7 and 3% at 30 and 40% by volume replacement respectively in blended mortars.
TL;DR: In this paper, the thermal properties of slag paste, mortar and concrete using seawater and sea sand exposed to elevated temperature were investigated, including temperature gradient, visual observation, mass loss, thermal strain and mechanical properties.
TL;DR: The use of local aluminosilicates to serve the local engineering applications could resolve the issue of unpredicted properties of the geopolymer caused by the wide variance in aluminosailicates reactivity as mentioned in this paper.
TL;DR: In this paper, the sustainability of incorporating pulp and paper waste sludge into concrete-based mortars was analyzed, and the results showed that for use in wall and ceiling mortar coatings, the level of incorporation should not exceed 10%, because higher levels yield lower values of mechanical strength resistance, incompatible with market requirements.
TL;DR: In this paper, a review summary of the earlier investigations which concentrated on using HVS (≥45%) as a part of cement in conventional paste, mortar and concrete mixtures is presented.
TL;DR: In this article, the effect of silica fume (SF) and basalt fibers (BF) on the mechanical properties and microstructure of magnesium phosphate cement (MPC) mortar was evaluated.
TL;DR: In this article, the feasibility of using granite sludge, produced during the manufacturing processes of ornamental stones, as a cement replacement in mortar and production of concrete blocks by assessing their physical, mechanical and durability performance was determined.
TL;DR: In this article, the effect of filler type and filler-bitumen ratio (FB ratio) on the air void, permeability, adhesion performance and raveling resistance was investigated.
TL;DR: In this paper, the authors used natural hemp fiber reinforced concrete mortars with different ratios (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 28, 30, 31, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 46, 48, 49, 50, 51, 54, 56, 57, 60, 59, 62, 63, 63
TL;DR: In this paper, a dynamic thermo-mechanical analysis test with various frequencies (0.1 Hz-2.0 Hz) and temperatures (−30 °C−30 ǫC) is undertaken on mortars with different CRT replacement ratios (0, 20, 40, 60, 80, and 100%).
TL;DR: In this article, the setting time and 7-day properties of geopolymer mortar were investigated considering several parameters such as curing temperature, sodium hydroxide solution molarity, alkaline solution to binder ratio and binder type.
TL;DR: In this article, the feasibility of incorporating sugarcane bagasse ash (SBA) from the sugar and ethanol industry as a filler material in the production of self-compacting concrete (SCC) was assessed.
TL;DR: In this paper, the use of bottom ash (BA) as pozzolanic material is discussed and the results showed that BA with a proper fineness could be used as a pozzolainic material according to ASTM C618.
TL;DR: In this article, the authors explored mechanical, electrical and self-sensing properties of carbon fiber reinforced mortars through the addition of short carbon fibers, at different dosages (2, 3, 4% by weight of cement).
Abstract: This paper is aimed at exploring mechanical, electrical and self-sensing properties of cement-based mortars through the addition of short carbon fibers , at different dosages (2%, 3%, 4% by weight of cement). Compression and bending tests on carbon fiber reinforced mortars (CFRM) were performed. The addition of carbon fibers showed to enhance the mortars’ flexural strength by increasing the fibers content, while no improvement was found in the compressive strength . Electrical resistivity of the CFRM, at different days of curing, was evaluated by AC impedance measurements, using two stainless steel wire meshes as electrodes. The electrical resistivity decreased with time, until reaching a constant value after about 60 days of curing. Carbon fibers were able to drastically reduce the mortar resistivity, up to values below 150 Ω cm. The effect of fibers dosage on the ability of the mortar to change its electrical resistivity when subjected to different stress states was also studied. The specimens were gradually loaded up to 50–60% of the maximum compressive strength, carrying out two loading/unloading cycles, while resistivity was measured using a conductivity meter. Depending on the fibers dosage and stress state within the material, CFRM resistivity changed with significant variations.
TL;DR: In this article, the authors applied this method to the use of marble dust (MD) in mortar and found that adding MD as paste replacement could substantially improve the carbonation and water resistances, reduce the shrinkage strain and rate, and at the same time reduce the cement content by up to 33%.
TL;DR: In this article, the strength development and durability of a fly ash mortar with calcium carbide residue (CCR) as additive cured at ambient temperature were investigated, and the results showed that the incorporation of CCR has an effect on the strength of the mortar.
TL;DR: In this article, the effects of high volume waste ceramic powder (WCP) inclusion on the mechanical and microstructure properties of alkali activated mortars (AAMs) exposed to elevated temperatures were reported.