Flow coefficient of the aggregates as a parameter characterizing the suitability of non-cohesive soils for earthworks

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Stanisław Majer


Keywords : flow coefficient of aggregates, uniformity coefficient
Abstract
The article presents the results of the flow coefficient of aggregate for 30 sands and aggregates. The introduction of European standards for the assessment of construction aggregates over 20 years ago introduced a number of new testing methods not previously used in Poland. One of them is the flow coefficient of aggregate, popularly called aggregate angularity. The method of determination is given in the standard PN-EN 933-6:2014. This standard defines the method of determining the index for coarse aggregates with grain sizes between 4 and 20 mm and fine aggregates with grain sizes below 2 mm. This test is particularly important when designing mineral-asphalt mixtures. Aggregate angularity, particularly in fine aggregates, is the main factor influencing the workability of mixtures. The flow time through the apparatus depends on the degree of roundness and form of the grain. The study determined the relationship between the flow coefficient of aggregate and CBR in relation to the uniformity coefficient. This indicator is still considered to be one of the main parameters that affect the suitability of non-cohesive soils in earthworks. It was proven that Ecs is more dependent on CBR than CU.

Article Details

How to Cite
Majer, S. (2020). Flow coefficient of the aggregates as a parameter characterizing the suitability of non-cohesive soils for earthworks. Scientific Review Engineering and Environmental Sciences (SREES), 29(3), 298–307. https://doi.org/10.22630/PNIKS.2020.29.3.25
References

AASHTO T 304 (2017). Standard method of test for uncompacted void content of fine aggregate. Washington: American Association of State and Highway Transportation Officials.

AFNOR P18-564 (1990). Determination du coefficient d’écoulement des sables [Determination of the flow coefficient of sands]. Paris: PR Industrie.

Aschenbrener, T. (1994). Implementation of a Fine Aggregate Angularity Test (Final Report CDOT-DTD-R-94-6). Denver: Colorado Department of Transportation.

ASTM C1252 (2017). Standard test methods for uncompacted void content of fine aggregate (as influenced by particle shape, surface texture, and grading). West Conshohocken, PA: American Society for Testing and Materials.

Chmielewski, M. (2008). Badania nad wpływem cech kształtu cząstek gruntów niespoistych na wybrane parametry ściśliwości [The studies on the influence of non-cohesive soil particle shape on the selected compressibility parameters]. Wrocław: Uniwersytet Przyrodniczy we Wrocławiu.

EN 1097-6:2013. Tests for mechanical and physical properties of aggregates. Determination of particle density and water absorption.

Glazer, Z. (1985). Mechanika gruntów [Soil mechanics]. Warszawa: Wydawnictwa Geologiczne.

Hansen, J.B., Lundgren, H., Beuck, O. & Rönfeldt, L. (2013). Hauptprobleme der Bodenmechanik [Problems in soil mechanics]. Berlin: Springer.

ISO/TS 17892-4:2004. Geotechnical investigation and testing. Laboratory testing of soil. Part 4: Determination of particle size distribution.

Judycki, J., Jaskuła, P., Pszczoła, M., Alenowicz, J., Dołżycki, B., Jaczewski, M., Ryś, D. & Stiness, M. (2014b). Katalog typowych konstrukcji podatnych i półsztywnych nawierzchni [Catalogue of typical semi-rigid and flexible pavements]. Warszawa: Generalna Dyrekcja Dróg Krajowych i Autostrad.

Judycki, J., Jaskuła, P., Pszczoła, M., Ryś, D., Jaczewski, M., Alenowicz, J., Dołżycki, B. & Stiness, M. (2014a). Analizy i projektowanie konstrukcji nawierzchni podatnych i półsztywnych [Analyses and design of semirigid and flexible pavements]. Warszawa: Wydawnictwa Komunikacji i Łączności.

Little, D., Button, J., Jayawickrama, P. & Hudson, B. (2003). Quantify shape, angularity and surface texture of aggregates using image analysis and study their effect on performance. Austin: Texas Transportation Institute.

Mamok, B. (2006). Wpływ zagęszczenia i nieregularności kształtu cząstek drobnoziarnistych gruntów niespoistych na wartości kąta tarcia wewnętrznego [The influence of the compaction and shape irregularities of fine- -grained non-cphesive soils on the values of internal friction angle]. Wrocław: Uniwersytet Przyrodniczy we Wrocławiu.

Mitchell, T. (ed.) (2001). Superpave mixture. Design guide. Washington: U.S. Department of Transport, Federal Highway Administration.

Parylak, K. (2000). Charakterystyka kształtu cząstek drobnoziarnistych gruntów niespoistych i jej znaczenie w ocenie wytrzymałości [Characteristics of particle shape of fine- -graded cohesionless soils and its significance in strength assessment]. Zeszyty Naukowe Politechniki Śląskiej, 90, 3-130.

PKN-EN ISO 14688-2:2018. Rozpoznanie i badania geotechniczne. Oznaczanie i klasyfikowanie gruntów. Część 2: Zasady klasyfikowania [Geotechnical investigation and testing. Identification and classification of soil. Part 2: Principles for a classification].

PN-B-04481:1988. Grunty budowlane. Badania próbek gruntu [Construction soils. Testing of soil samples].

PN-EN 1097-6:2013. Badania mechanicznych i fizycznych właściwości kruszyw. Część 6: Oznaczanie gęstości ziarn i nasiąkliwości [Tests for mechanical and physical properties of aggregates. Part 6: Determination of particle density and water absorption].

PN-EN 933-1:2012. Badania geometrycznych właściwości kruszyw. Część 1: Oznaczanie składu ziarnowego. Metoda przesiewania [Tests for geometrical properties of aggregates. Part 1: Determination of particle size distribution. Sieving method].

PN-EN 933-6:2014. Badania geometrycznych właściwości kruszyw. Część 6: Ocena właściwości powierzchni [Tests for geometrical properties of aggregates. Part 6: Assessment of surface characteristics].

PN-EN ISO 17892-4:2017-01. Rozpoznanie i badania geotechniczne. Badania laboratoryjne gruntów. Część 4: Badanie uziarnienia gruntów [Geotechnical investigation and testing. Laboratory testing of soil. Part 4: Determination of particle size distribution].

PN-S-02205:1998. Drogi samochodowe. Roboty ziemne. Wymagania i badania [Car roads. Earthworks. Requirements and tests].

Quiroga, P.N. & Fowler, D.W. (2004). The effects of aggregates characteristics on the performance of Portland cement concrete. Austin: International Center for Aggregates Research, The University of Texas.

Szerakowska, S. (2018). Ocena parametrów kształtu ziaren i ich wpływu na zagęszczalność gruntów niespoistych [Asessment of grain shape parameters and their influence on the compactability of non-cohesive soils]. Białystok: Politechnika Białostocka.

Topal, A. & Sengoz, B. (2005). Determination of fine aggregate angularity in relation with the resistance to rutting of hot-mix asphalt. Construction and Building Materials, 19(2), 155–163. https://doi.org/10.1016/j.conbuildmat.2004.05.004

Zięba, Z. (2013). Wpływ cech kształtu cząstek drobnoziarnistych gruntów niespoistych na ich wodoprzepuszczalność [Influence of particle shape of fine-grained soils on their permeability]. Wrocław: Politechnika Wrocławska.

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