An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

Skutnik, Zdzisław; Sobolewski, Mariusz; Koda, Eugeniusz

doi:10.3390/ma13245624

Cited by 21 publications

(14 citation statements)

References 49 publications

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“…Additionally, it is seen that the mix containing type 2 treated RCA and with 5% RHA has a permeability, closer to the control mix containing NA (only a 6% increase in RCA2-30/5, when compared to NA0). Meanwhile all the values obtained were less than 50 mm, which means, according to DIN 1045 [81] standards all the concrete mixes can be considered watertight [80]. Hence in conclusion of the outcomes from previous tests, RCA2-30/5 concrete exhibits superior durability properties due to the densified structure of concrete compared to other RAC mixes.…”

Section: Water Permeability Testmentioning

confidence: 85%

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Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates, respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of pozzolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.

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Section: Water Permeability Testmentioning

confidence: 85%

“…From previous studies, it is seen that penetration depths increase for increasing replacements of cement by of RHA in concrete [78][79][80]. The average values for water penetration depths at 90 days, measured to the nearest mm are presented in Fig.…”

Section: Water Permeability Testmentioning

confidence: 86%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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“…According to the conclusions of Grygierek's work, scientists' predictions of global warming should be considered in the design process of buildings for thermal isolation thicknesses [58]. As a result, a designed building with a lower primary energy demand will reduce the consumption of natural resources and reduce CO 2 emissions into the atmosphere [59][60][61].…”

Section: Discussionmentioning

confidence: 99%

Design of Passive Building Foundations in the Polish Climatic Conditions

et al. 2021

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A Passive House (PH) system is not only an opportunity but also a necessity for the further development of sustainable eco-buildings. Construction of the foundation in energy-efficient houses is the key to maintaining low energy losses. The appropriate selection of building materials requires considering the thermal conditions of the environment, including its location and the zero isotherms in the ground. The main objective of this work is to analyze the possibilities of designing foundations for PHs in Poland, according to the current methodological data. In order to realize the basic aims, the work was divided into the following materials and methods: (I) literature review; (II) database of PH in Central Europe; (III) method of depth of ground freezing determination; (IV) selection of the joint of slab-on-ground foundation and external wall to analysis; (V) description and validation of the heat-transfer model. The result of the research work is: (i) analysis of the foundation under the conditions of freezing of the ground in Poland; (ii) description and validation of the heat-transfer model. The research has revealed that in the Polish climate zone, the most efficient solution for passive buildings is to build them on a foundation slab. The foundation of a building below the latest specified ground frost depths in Poland is inefficient in terms of, for example, thermal insulation, economics, and the idea of PH.

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“…Finally, according to the assumption of water flow through a system for being continuous and laminar, Darcy’s law was applied. Darcy’s coefficient of permeability was determined using Equation (1) [ 14 ]: K = QL/AΔP where Q is the water flow rate through the specimen (m 3 /s), K is Darcy’s coefficient of permeability (m/s), A is the cross-section of the sample (m 2 ), ΔP is the difference in pressure due to the water height (Pa), and L length of the sample (m). In this manner, the obtained results allowed the following analysis.…”

Section: Healing Efficiency Of Aligned Tubular Fibers Full Of Healing Agentmentioning

confidence: 99%

Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

Soro

Wang

et al. 2021

Materials

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From the perspective of improving the self-healing method in construction, a tubular healing fiber was adopted as a container to improve the encapsulation capacity, which was available using a micro-capsule as a container. Knowing the direction of the stresses to which structure members are subjected, this research investigated the influence of aligning tubular healing fibers parallel to intended stress into a cementitious composite to increase the self-healing capability. For that, a healing agent was encapsulated into a tubular healing fiber made with polyvinylidene of fluoride resin (PVDF). Then, the healing fiber was combined with steel fibers to align both fibers together parallel to the direction of an intended splitting tensile stress when subjected to a magnetic field in a cylindrical cementitious composite. The alignment method and the key point through which the alignment of the healing fibers could efficiently improve autonomic self-healing were investigated. Since the magnetic field is known to be able to drag steel to an expected direction, steel fibers were combined with the healing fibers to form a hybrid fiber that aligned both fibers together. The required mixture workability was investigated to avoid the sinking of the healing fibers into the mixture. The healing efficiency, according to the orientation of the healing fibers in the composite matrix, was evaluated through a permeability test and a repetitive splitting tensile test. The aligned healing fibers performed better than the randomly distributed healing fibers. However, according to the healing efficiency with aligned healing fibers, it was deduced that the observed decreasing effect of the container’s alignment on the specimen’s mechanical properties was low enough to be neglected.

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An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

Cited by 21 publications

References 49 publications

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Design of Passive Building Foundations in the Polish Climatic Conditions

Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

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