Laboratory studies of Miocene limestone in Sri Lanka

Jayawardena, U. de S.

doi:10.1144/qjegh2016-106

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…The authors claimed that the presence of these minerals could over a period of time cause strength failure. In the study by Pang et al (2010) and Jayawardena (2017), the LA performance of 25% and 33-38%, respectively, of limestone showed that the strength depends on the content of calcite mineral. Both authors claimed that limestone may not be suitable for surface layer of road pavement.…”

Section: Secondary and Accessory Mineralsmentioning

confidence: 98%

Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

Adomako

Engelsen

Thorstensen

et al. 2021

Bull Eng Geol Environ

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Rock aggregates constitute the enormous volume of inert construction material used around the globe. The petrologic description as igneous, sedimentary, and metamorphic types establishes the intrinsic formation pattern of the parent rock. The engineering properties of these rocks vary due to the differences in the transformation process (e.g. hydrothermal deposits) and weathering effect. The two most common mechanical tests used to investigate the performance of aggregates are the Los Angeles (LA) and micro-Deval (MD) tests. This study reviewed the geological parameters (including mineralogy, grain and crystal size, grain shape, and porosity) and the relationship to Los Angeles and micro-Deval tests. It was found that high content of primary minerals in rocks (e.g. quartz and feldspar) is a significant parameter for performance evaluation. Traces of secondary and accessory minerals also affect the performance of rocks, although in many cases it is based on the percentage. Furthermore, some studies showed that the effect of mineralogic composition on mechanical strength is not sufficient to draw final conclusions of mechanical performance; therefore, the impact of other textural characteristics should be considered. The disposition of grain size and crystal size (e.g. as result of lithification) showed that rocks composed of fine-grain textural composition of ≤ 1 mm enhanced fragmentation and wear resistance than medium and coarse grained (≥ 1 mm). The effect of grain shape was based on convex and concave shapes and flat and elongated apexes of tested samples. The equidimensional form descriptor of rocks somehow improved resistance to impact from LA than highly flat and elongated particles. Lastly, the distribution of pore space investigated by means of the saturation method mostly showed moderate (R = 0.50) to strong (R = 0.90) and positive correlations to LA and MD tests.

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Section: Secondary and Accessory Mineralsmentioning

confidence: 98%

Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

Adomako

Engelsen

Thorstensen

et al. 2021

Bull Eng Geol Environ

View full text Add to dashboard Cite

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“…Miocene limestone, widely distributed sedimentary rock in Sri Lanka is a highly porous and permeable rock and not a strong rock. But some highly consolidated and compacted parts are strong [8].…”

Section: Resultsmentioning

confidence: 99%

A Study on the Soundness of Parent Rocks in Sri Lanka

Jayawardena¹

2018

TCEIA

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Studies on the engineering properties of different rock types provide a prior knowledge on the quality of such rock types as well as potential locations of suitable sources for the industry. The property "soundness" of a material measures the tendency to split into pieces similar to physical weathering during expansion and contraction processes within it. This soundness varies according to the type of minerals in a rock and its' origin. If rocks are using for aggregates for concrete or other applications the estimation of their soundness is necessary. With the aim of that, fresh rock samples of different rock types were collected from quarries and exposed rocks in different locali-ties in Sri Lanka to study the variation of soundness property in different rock aggregates. Samples were tested in the geotechnical engineering laboratory using sodium sulfate solution according to the Standard Method ASTM C88-99a. The rock types were Chranockite/charnockitic gneiss, garnet/hornblende/biotite gneiss, Microcline/Granitic gneiss, Garnet/biotite gneiss, Marble, Hornblende biotite gneiss, Quartzite, pegmatite, pink granite and Miocene limestone. Accordingly charnockite/ charnockitic gneiss shows the lowest loss of weight percentage as the highly sound rock for aggregates. Miocene limestone is the highly unfavorable rock.

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Recycled aggregates derived from excavation materials—mechanical performance and identification of weak minerals

Adomako

Engelsen

Danner

et al. 2022

Bull Eng Geol Environ

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The present study investigates the mechanical performance of recycled aggregates derived from excavation materials (REM). REM is blended with different quantities of recycled phyllite materials (RPM) and is investigated by Los Angeles (LA) and micro-Deval (MD) tests. X-ray diffraction (XRD) and acid solubility test are performed on the pulverized fractions < 1.6 mm obtained from the LA and MD tests to assess the respective degree of fragmentation and wear of mineral components. The results of the materials in unblended conditions showed considerable difference between MD performance while similar performance was found for LA. Furthermore, about 40% of RPM was sufficient to blend with REM without disturbing the required performance for blended mixtures. Mechanically weak minerals, i.e., phyllosilicates in RPM, significantly influenced the MD performance in blended and unblended varieties, and limestone minerals seem to disintegrate when mixed with amphibolite -which has the potential to dissolve in acidic environments.

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Laboratory studies of Miocene limestone in Sri Lanka

Cited by 6 publications

References 3 publications

Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

A Study on the Soundness of Parent Rocks in Sri Lanka

Recycled aggregates derived from excavation materials—mechanical performance and identification of weak minerals

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