THE INFLUENCE OF THE UNLOADING MODE OF ASPHALT CONCRETE MIXING PLANT HOT BIN ON THE HOMOGENEITY OF SCREENED FRACTIONS

Henrikas Siviievičius

doi:10.3846/16484142.2004.9637967

Abstract

The analysis of hot asphalt concrete mixture production in asphalt concrete mixing plants of intermittent operation according to the traditional technology scheme is presented. The segregation degree of hot mineral materials fractions of 0–5 mm and 5–15 mm sieved in hot bins and the influence of their screening mode on the homogeneity of the flow running to the measuring hopper were identified during the experimental tests carried out in two asphalt concrete mixing plants. To evaluate the degree of segregation and kinetics according to three different methodologies 214 separate samples of hot fractions grouped into three series A, B, C were taken. Statistical characteristics of each series samples grading and coarseness modulus (fraction of 0–5 mm) as well as arbitrary coarseness modulus (fraction of 5–15 mm) were identified. The data analysis proved that the degree of segregation of hot materials sieved in the bin sections is high and the homogeneity of their flows decreases when the range and frequency of quantity fluctuation increases.

Highlights

Asphalt concrete mixtures (ACM) to be laid and compacted setting up the road pavement layers shall ensure rigid concrete of optimal structure and characteristics which would resist the impact of transport and climate factors for a long time
Rokas S. [6] came to a conclusion that during the working shift when the ACM production process is stopped for lack of transport, the change of the mixture composition or the removal of the surplus of hot fractions (H.r), optimal technological parameters misalign, due to which deviations of production quality indices decrease
When investigating separate samples taken from the surface of H.r 0-5 mm and 5-15 mm, the distribution of the grading of materials screened through the technological screens of asphalt concrete mixing plant (ACMP) in bin section plan; i.e. the type and degree of their segregation was identified

Summary

Introduction

Asphalt concrete mixtures (ACM) to be laid and compacted setting up the road pavement layers shall ensure rigid concrete of optimal structure and characteristics which would resist the impact of transport and climate factors for a long time. [6] came to a conclusion that during the working shift when the ACM production process is stopped for lack of transport, the change of the mixture composition or the removal of the surplus of hot fractions (H.r), optimal technological parameters misalign, due to which deviations of production quality indices decrease. These theoretical assumptions were not thoroughly assessed due to complicated experimental tests, which shall be carried out in ACMP. Sivilevièius / TRANSPORT 2004, Vol XIX, No 3, 141147 of the kinetics of their running from bin sections on the homogeneity of doses falling to the measuring hopper

Aims and kinetics of hot screening

Investigation of sample characteristics

Empirical data analysis

Findings

Conclusions