Surface permeability of natural and engineered porous building materials

Grover, David; Savidge, C.; Townsend, Laura; Rosario, Odanis; Hu, Liang; Rizzo, Donna M.; Dewoolkar, Mandar M.

doi:10.1016/j.conbuildmat.2016.02.193

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…It is therefore necessary to apply a geostatistical approach to the estimation and simulation of values to 'fill the spaces' between known sample points. Through such techniques, geostatistics can be used to assess the heterogeneity and anisotropy of porous masonry (Grover et al 2016).…”

Section: Geostatistics and Permeabilitymentioning

confidence: 99%

Comparative investigation of the spatial distribution of past weathering impacts on sandstone masonry

2019

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Inspection of the deterioration of both natural outcrops and historical built stone facades reveals that patterns of disruption are not uniform, indicating the influence of material and environmental properties. Sandstones have a spatial variability in weathering response. For this reason, geostatistical techniques have been applied to studies of sandstone properties, mineralogical and structural, that influence susceptibility to decay. For this study, a comparative analysis of permeability data acquired from a 'quarry fresh' stone and a weathered sample is undertaken.The depositional processes that resulted in the formation of sandstone also create structures of spatial variation such as laminations or larger bedding planes within the material. Using geostatistical techniques, the permeability variance observed within 'quarry fresh' blocks of sandstone indicates the subsampling of larger geological structures when cut from the quarry face. Once blocks have been emplaced within a building they will be subjected to the increased stress of the urban environment.These conditions result in exacerbated weathering through processes such as salt and chemical weathering. Weathering can alter material properties such as permeability with the creation of a secondary permeability produced by the opening pores and alteration of pore connectivity. Through the application of geostatistics in the analysis of permeability data observed from the weathered block, variography reveals the presence of smaller scale structures. This suggests that alteration of the sandstone's permeability has led to the creation of new weathering structures within the stone, overwriting the initial sedimentary structures. These weathering related structures will affect both the magnitude and spatial distribution of permeability within the weathered block. The interconnected pathways of permeability, created by past weathering, facilitate the migration of moisture and salts in solution through the substrate. This work has demonstrated that through a geostatistical approach with the application of co-kriging, these potential moisture pathways can be identified and visualised. Highlights (3-5, 85 Characters Each) Structures can be observed within the variance of permeability using geostatistics. Observed variogram structures indicate the block is sampling sedimentary features. Alteration of permeability through weathering overwrites sedimentary structures. Co-Kriging is used to model conduits for moisture movement through a weathered block.

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Section: Geostatistics and Permeabilitymentioning

confidence: 99%

Comparative investigation of the spatial distribution of past weathering impacts on sandstone masonry

2019

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“…The higher the porosity, the weaker the physical structure. However, the primary concern about porosity is the penetration of the water [12,13,16,19]. The aqueous (and gaseous) permeability of porous building material is directly related to the durability of the material [16].…”

Section: Fig 1 Evaporation In Porous Building Materialsmentioning

confidence: 99%

“…In accordance with this issue, the use of porous material [2,[4][5][6][7] and the use of coating [1,8] has become the "passive" alternatives to reduce the energy consumption for thermal control. Nevertheless, the majority of researches on building material and coating tend to solely focus on the technical and physical properties of the building material and coating [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. This paper focuses instead on developing a core understanding of the different kinds of porosity and coating across building materials that influence the building performance.…”

Section: Introductionmentioning

confidence: 99%

“…Some researches address how porous materials provide transporting ability that support passive cooling through evaporation, moisture and heat transfer [2,[4][5][6][7][9][10][11] while coating supports the thermal control due to its reflectance toward heat source radiation (sunlight) [1,8]. However, in many context, porosity is also considered as the beginning of degradation and deterioration of building material that become the parameter of its durability [12][13][14][15][16][17]. The porosity of building material is associated with the durability of the material, and coating often becomes the response toward this durability issue.…”

Section: Introductionmentioning

confidence: 99%

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To Coat or Not To Coat: A question on porosity and coating in building material

Saginatari

Yatmo

2018

E3S Web Conf.

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Building material has been one of the aspects in architecture that directly relate with the overall building performance. Nowadays, porous traditional building material, such as bricks, stones, concrete, is still preferred due to its performance of porosity that supports passive cooling and reduces the building’s energy consumption. However, the porosity of building material could also cause many problems, such as damp, fungal and moss growth, that could cause deterioration of the building leading to the practice of coating. This paper questions how the act of coating often seen as a way of keeping the building in perfect condition with disregard to the building material’s porosity. It investigates how the different mechanism of porosity in building material in turns triggers a different act of coating. Furthermore, this paper argues that the act of coating should consider the performance of porosity to achieve a better building performance, not just regarding the energy efficiency but also the ecological sensibility towards the environment.

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“…The gradual depletion of raw materials for the current, low quality and saving clay resources for the purpose of state strongly encourage the use of low-grade waste even to develop new building materials, to achieve the purpose instead of clay building materials [9][10][11]. To address the shortage of supplies of raw materials, quality improvement, conservation of land resources and improve the economic value of low-grade quartz sand for the purpose of the use of low-grade quartz sand along the Yangtze River to develop new building materials [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Loading Quantity on the Properties of Quartz Sand Powder via Mechanical Ball Milling Method

Wang¹,

Wang²,

Yang³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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Abstract. In order to improve the utilization and added value of the Yangtze river sand, the raw materials for preparing high performance quartz sand insulating brick were investigated, the following conclusions can be obtained through investigating the influence of mechanical milling loading quantity on performance of quartz sand powder. With the increase in milling added material, the average particle size of quartz sand is gradually increased. When the loading quantity is small, the powder particle size distribution is narrow, and when loading quantity is large, the powder particle size distribution is wider. With the increase of milling added material, quartz sand powder high cone decreases, namely quartz sand powder flowability loading quantity increases gradually changed for the better. With the increase of quantity of milling device, tap density of quartz sand powder increases. However, when loading quantity higher than 200g/L ball milling, quartz sand tap density increased considerably larger. Comprehensive consideration the overall process, milling loading quantity was 200g/L preferably, the average particle diameter of quartz sand powder is 11.21um.

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Surface permeability of natural and engineered porous building materials

Cited by 12 publications

References 25 publications

Comparative investigation of the spatial distribution of past weathering impacts on sandstone masonry

Comparative investigation of the spatial distribution of past weathering impacts on sandstone masonry

To Coat or Not To Coat: A question on porosity and coating in building material

Influence of Loading Quantity on the Properties of Quartz Sand Powder via Mechanical Ball Milling Method

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