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Mindaugas Daukšys

Bio: Mindaugas Daukšys is an academic researcher from Kaunas University of Technology. The author has contributed to research in topics: Properties of concrete & Aggregate (composite). The author has an hindex of 6, co-authored 46 publications receiving 180 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the effect of crumb rubber on the strength of concrete has been examined and the authors have shown that the change in the strength with crumbed rubber waste additives can be forecasted from exponential equations.
Abstract: This article describes the observed and examined effect of crumb rubber on the strength (compressive, bending and splitting tensile) of concrete The tests have shown that the change in the strength of concrete with crumb rubber waste additives can be forecasted from exponential equations These relationships enable to foresee the regularities of strength properties when a certain amount of crumb rubber of a certain size fraction is added to concrete The obtained exponential equations show that concrete compressive, flexural and splitting tensile strengths decrease with increasing crumbed rubber additive amount The testing has also shown that the addition of a small amount of crumbed rubber slightly increases (7%) the tensile splitting strength The reason is better adhesion of the cement stone with rubber particles compared to the adhesion of sand, which was replaced by crumbed rubber With higher content of crumbed rubber additive in the concrete, the tensile splitting strength decreases due

54 citations

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TL;DR: In this paper, the relationship between the point thermal bridges resulting from aluminum fasteners, which are used for installation facades cladding, and the thermal properties of materials that are used in external walls layers and dimension of layers is analyzed.
Abstract: In the design of high-energy performance buildings with ventilated facade systems, the evaluation of point thermal bridges is complicated and is often ignored in practice. This paper analyzes the relationship between the point thermal bridges resulting from aluminum fasteners, which are used for installation facades cladding, and the thermal properties of materials that are used in external walls layers and dimension of layers. Research has shown that the influence of the point thermal bridges on the U-value of the entire wall may achieve an average of up to 30% regarding thermal properties of materials of the external wall layers and the dimension of layers. With the increase in thermal conductivity of the bearing layer material and the thickness of the thermal insulation layer, the point thermal transmittance χ-value increased. For this reason, the U-value of the entire wall may increase by up to 35%. With the increase of the thickness of the bearing layer and thermal conductivity value of thermal insulation layer, the point thermal transmittance χ-value decreased by up to 28%. A simplified methodology is presented for the evaluation of point thermal bridges based on the thermal and geometrical properties of external wall layers.

34 citations

Journal ArticleDOI
TL;DR: In this article, rubber waste was used as replacement of fine aggregate in concrete mixes, which affects mechanical properties and durability of concrete: freeze-thaw resistance, water absorption by immersion, and sulphate resistance.

23 citations

Journal Article
TL;DR: In this paper, hydrosodalite was used as a hydraulic additive for hardened cement paste, and the influence of this additive on the hydration and other properties of the system was determined.
Abstract: A synthetic zeolite – hydrosodalite was used as a hydraulic additive for hardened cement paste, and the influence of this additive on the hydration and other properties of the system was determined Hydraulic activity of zeolite has been examined, X-ray diffraction, DTA and IR analysis of the hardened cement paste with zeolite additive have been carried out The results have shown that the additive has a high hydraulic activity (the content of bound CaO – 370 mg/g) The addition of hydrosodalite reduces the content of Ca(OH)2 in hardened cement paste which transforms into calcium zeolite – gismundite The density of the hardened cement paste with the addition of hydrosodalite after 3, 7 and 28 days of curing decreases by about 11% This predetermines a decrease in the compressive strength of the hardened cement paste The compressive strength after 3 days of curing decreases by about 70%, after 7 days of curing – by 66%, and after 28 days of curing – by about 65%

15 citations

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TL;DR: The results of experimental investigation of plasticising, air-entraining and viscosity-modifying admixtures with different chemical composition influence on rheological properties and dilatancy of cement slurries are presented in this paper.
Abstract: The results of experimental investigation of plasticising, air‐entraining and viscosity‐modifying admixtures with different chemical composition influence on rheological properties and dilatancy of cement slurries are presented in the article. Rheological properties of cement slurries were tested by a rotation viscometer with coaxial cylinder, at different gradients of velocity. Dilatancy of cement slurries was determined by the distortion of the rheological curve and index of dilatancy D was calculated according to proposed methods. The results of investigation show that the properties of liquid disperse medium of structural system influence slightly the dilatancy of cement slurries. Plasticising admixtures with a different chemical composition slightly increases but air‐entraining and viscosity‐modifying admixtures slightly reduces the dilatancy of cement slurries.

15 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provide a fundamental insight into the integrated applications of rubberized concrete composite materials to improve construction methods, including applications to enhance environmental sustainability of concrete structures in the construction industry.

210 citations

Journal ArticleDOI
TL;DR: In this article, the effects of rubber sand on workability, setting time, bleeding, density, strength, impact energy, impact load, toughness, ductility, shrinkage, abrasion resistance, freeze/thaw resistance, fire resistance, thermal insulation, carbonation resistance, corrosion resistance, water absorption, porosity, chloride ion penetration, resistance to aggressive environmental, energy absorption, sound absorption, electrical resistance and cracking resistance of rubberised mortar/concrete were reviewed.
Abstract: Currently, the need to incorporate recycled materials such as rubber in building products is becoming more important than ever before. The use of waste rubber in mortar/concrete mixtures creates landfill avoidance and decreases the depletion of virgin raw materials. Waste rubber can be used as a part of fine aggregate, coarse aggregate or both aggregates. It can be used as an additive to Portland cement (PC). This paper presents an overview of the previous researches carried out on the use of waste rubber as partially or fully natural fine aggregate replacement in traditional mortar/concrete mixtures based on PC. The effects of rubber sand on workability, setting time, bleeding, density, strength, impact energy, impact load, toughness, ductility, shrinkage, abrasion resistance, freeze/thaw resistance, fire resistance, thermal insulation, carbonation resistance, corrosion resistance, water absorption, porosity, chloride ion penetration, resistance to aggressive environmental, energy absorption, sound absorption, electrical resistance and cracking resistance of rubberised mortar/concrete were reviewed.

145 citations

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TL;DR: In this article, the authors investigated the durability of rubberized concrete and concrete samples with NaOH-solution treated rubber particles and found that the added rubber particles improved the freeze-thaw resistance of concrete.

122 citations

Journal ArticleDOI
TL;DR: In this paper, the combined effects of compressive strength and hydration development of blended cements which contain fly ash were investigated in order to determine the characteristics of Portland cement and fly ash.

121 citations

Journal ArticleDOI
TL;DR: The use of crumb rubber in concrete has been practiced for some years as discussed by the authors and it is an effective environmental approach to use to reduce the amount of scrap tyres in landfills around the world.
Abstract: The use of crumb rubber in concrete has been practiced for some years. It is an effective environmental approach to use to reduce the amount of scrap tyres in landfills around the world. However, there are concerns about the mechanical properties of crumb rubber concrete (CRC) and its associated applications. The main purpose of this study is to provide a closer look at different mechanical properties of fibre reinforced polymer (FRP) confined and unconfined CRC with high rubber content. In this study, six concrete mixtures having 0%, 10%, 20%, 30%, 40%, and 50% rubber content replacement of sand volume were produced. Different mechanical properties including compressive strength, tensile strength, modulus of elasticity, unit weight, impact resistance, water absorption, temperature effect, stress-strain behaviour, and FRP-confinement effect were measured. The results indicated that the use of FRP to confine rubberized concrete effectively negates the decrease in strength, and retains the advantages of increased ductility that arise from rubberized concrete. In addition, increasing concrete rubber content from zero to 50% increased its impact resistance by approximately 3.5 times. This indicates promising potential for structural applications, particularly in seismic zones.

113 citations