Volume 24, No. 2 (2018)

COMPRESSIVE STRENGTH BEHAVIOUR OF CONCRETE PRODUCED USING OKIGWE RED LUMP STONE AS COARSE AGGREGATE

CHIOMA TEMITOPE GLORIA AWODIJI(1*), CHINEDU PAUL EZEGO(1), DAVIS OGBONNA ONWUKA(1), STANLEY EMEKA IWUOHA(1)

This study was carried out in order to ascertain if the Okigwe red lump stone, found in South-eastern Nigeria, could be used as coarse aggregate in making structural concrete. The maximum compressive strength values, obtained at 28 days for red lump stone concrete were 13.72 N/mm2 at w/c ratio of 0.53 for mix ratio 1:2:4 and 8.74 N/mm2 for mix ratio 1:3:6, at w/c ratio of 0.55. These values were not up to 20 N/mm2 which is the ACI 318 (1995) recommendation for structural concrete. Therefore, Okigwe red lump stone must not be used in making structural concrete using mixes 1:2:4 and 1:3:6.

EVALUATION OF THE HEATING SYSTEM FROM AN INJECTION MOLDING MACHINE

LUMINITA BIBIRE(1), NARCIS BARSAN(1*)

Injection is an economical process characterised through an increased productivity that leads, in the majority of cases, to finite pieces. The process of injection includes two distinctive phases, firstly, when the melting occurs, followed by the homogenisation and the creation of pressure; the process takes place in the plasticizing unity; coming next being the second phase that consists in the forming of the producs, in the cavity of the matrix. Regarding the main factors, the purpose of this paper was insuring a thermic regime as uniform as possible in order to obtain an appropriate plastifying process. To do this, with the help of a thermovision camera type Fluke Ti20, the thermic regime has been studied in the area of the plastifying cylinder, following the balancing of the heating resistances.

PERFORMANCE OF WIRELESS MEASUREMENT SYSTEM FOR SOIL PROPERTIES MONITORING

TSVETELINA GEORGIEVA(1*), NADEZHDA PASKOVA(1), GERGANA KUNCHEVA(1), PLAMEN DASKALOV(1)

A developed wireless microprocessor system based on ATmega328P microcontroller and Arduino sensors for measurement of soil properties is described in the paper. The accuracy of the proposed system is analized during the measurement of basic soil parameters – electrical conductivity and acidity. The system has been experimentally tested with soil samples from eight soil types and soil solution. The results for the soil parameters obtained with the wireless measurement system are compared with a reference measuring instrument. The presented wireless system for soil parameters monitoring shows good measurement accuracy sufficient for engineering research.

A PROJECT MANAGEMENT UTILITY FOR AGRICULTURAL FACILITIES AND PUBLIC HEALTH

TILEMACHOS KOLIOPOULOS(1*), KRYSTYNA CIARKOWSKA(2), JACEK ANTONKIEWICZ(3), SOKRATIS THEOCHARATOS(4), CRINA RADU(5), ION CRISTEA(6), PANAGIOTIS KOULOUMPIS(7)

This research study analyses the project management of agricultural facilities that protect agricultural food and public health from associated toxic hazardous landfill emissions and risks. Project management is presented by the development of a geoinformatics utility so as to improve operational management not only in food production minimizing the consumption of resources but also to improve the bio capacity development of the services and products through effective constructions minimizing risks for public health. Useful results are presented based on geoinformatics utility that develops sanitary drawings in sustainable designs minimizing risks and indoor pollution hazardous emissions in working spaces minimizing health risks.

TREATMENT OF WASTEWATER FROM SWINE AND POULTRY SLAUGHTERHOUSES

MIRELA SUCEVEANU(1), IULIAN SUCEVEANU(2), LUMINIŢA GROSU(1), IRINA-CLAUDIA ALEXA(1*)

The meat processing industry produces large volumes of slaughterhouse wastewater (SWW). For this reason, water and wastewater treatment has become crucial for the continuing development of the society. The present study reveals the water pollution degree from poultry and the swine slaughterhouses from Bacau (Romania). The possibility of reducing the quantity of pollutants by the active sludge treatment method is also presented. The efficiency of this treatment processes was evaluated through the following parameters: biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total suspended solids (TSS), turbidity, both before and after the active sludge treatment.

A COMPARATIVE STUDY BETWEEN WATER-GAP AND AIR-GAP DISTILLATION MEMBRANES FOR REMOVAL OF SALTS FROM SALINE WATER BY DESALINATION METHOD

LAURENTIU TATARU(1*), VALENTIN NEDEFF(1,2), NARCIS BARSAN(1), MIRELA PANAINTE-LEHADUS(1), EMILIAN MOSNEGUTU(1), DANA CHITIMUS(1), FLORINA FABIAN(1)

The water deficit for consumption in various daily activities is more pronounced especially in countries where rainfall is low or in those areas where water demand is higher than available resources. This paper is a comparison between the airgap and water-gap distillation method. The results of the study have shown that the water-based distillation method can be more efficient, as the volume of permeate obtained is higher in relation to the increase in the flow temperature.The results obtained as well as the comparison of the advantages related to the two membrane distillation processes will be presented in the present paper.