MEKKI Maza

Bouzid Maroua , Bouzid Mira, //////////////////////////////////////////

Amélioration des caractéristiques rhéologique du mortier auto nivelant par ajout combiné du sable de verre et du sable fin de Boussaâda.

BOUKHALFA Khalissa , BOUZID Nadjet, //////////////////////////////////////////

Effet de la cohésion des granulats fin sur la rhéologie et les propretés mécanique du mortier

Brinis Elmehdi , Redjem Elhassen

Effet du sable fin de Boussaada sur le Mortier auto-nivelant à base du sable de “Djamaa”

Mekkaoui Smail

Effet combine du sable de verre et de la poudre de marbre sur mortier auto-nivelant

Beddar Abdelhamid , Nadji Abd Errahmane

Effet des caractéristiques des granulats fins sur les proprités du mortier Auto-plaçant

Benseghir Wahiba , Saidane Werida

Effet du mélange de sable de differente nature (sable concassé et sable de dune) sur les caractéristiques d’un béton Auto-plaçant

Boujemaa yamina , Djilani souaad

Micro-Béton à base de sable mixte (sable de dune et sable concassé) avec poudre de marbre et adjuvant

Radjai oussama , Bourezg djamel

Effet combine des fumées de silice et des fines de verre sur les propriétés du mortier à base de sable de dune

The search for an alternative to cement has become an environmental and strategic necessity to reduce the effects of global warming and preserve the energy capacity of energy-importing and energy-exporting countries alike. Geopolymer materials are classified as green materials and may be the alternative solution proposed at the present time due to their advantages. The results of research and studies have shown that these geopolymer materials possess superior mechanical and physical properties, including high early strength, good chemical resistance, low shrinkage, and good thermal resistance. The rise in temperatures in recent years and the global warming scenario has led to an increase in demand for heat-insulating materials, especially in the construction sector. This review includes, based on previous research, previous knowledge of more about the basics of these geopolymer materials the raw materials that go into preparing these compounds and the factors affecting their properties. The good thermal performance of these compounds is considered important and vital to exploit in the production of efficient insulating materials, and it may be a sustainable solution in re-exploiting mineral waste in order to preserve natural resources

Citation

Mekki MAZA , ,(2023-12-18), A bibliographic study on geopolymers and the valorization of mining waste,The 1st Scientific Days on Materials and Their Applications (SDMA’2023),(SDMA’2023),,Université de Biskra, Algérie

Comprehending the mechanical characteristics of concrete is paramount for its efficient deployment in construction. This investigation endeavors to predict these properties utilizing equivalent mortar, furthering previous inquiries on the topic. Literature suggests a viable approach to create concrete through a method employing both natural and crushed aggregates. This technique considers the corresponding mortar, amalgamated with crushed (SC) and dune sand (SD), as a novel mortar. Implementing this method could curtail the consumption of natural resources while conserving the mechanical attributes in both fresh (flow) and hardened states (strength and durability). This approach aims to anticipate the mechanical performance of concretes formulated from equivalent mortar data. Five mixtures were constituted to discern the optimal blend from a binary amalgamation of crushed coarse aggregates (30% fraction 3/8 and 70% fraction of 8/15) sized 3.8mm and 8.15mm, alongside five mixed sand percentages: (30% SC+70% SD), (40% SC+60% SD), (50% SC+50% SD), (60% SC+40% SD), and (70% SC+30% SD). The application of super plasticizer was investigated, and the compressive strength function of coarse aggregate was ascertained at intervals of 7, 14, and 28 days. The mechanical strength was determined at the 28-day mark. The empirical study indicates that density attains its zenith when a 40% mortar is incorporated into the concrete matrix. Conversely, with a 50% SC composition within the mixed sand, the mechanical strengths achieve acceptable values with moderate CS dosages. Specification tests reveal that incorporating 50% to 70% mortar into the concrete matrix can yield highquality concrete.

Citation

Mekki MAZA , MAZA Mekki, , (2023-10-05), Predicting Mechanical Properties of Concrete Using Equivalent Mortar: A Comparative Study, Annales de Chimie - Science des Matériaux, Vol:47, Issue:5, pages:265-271, Journal homepage: http://iieta.org/journals/acsm

Sludge valorization, also called sludge management, is an important field in the treatment of wastewater and solid waste worldwide. Sludge is the solid byproduct generated during the treatment of wastewater in sewage treatment plants. They often contain organic matter, mineral elements and other contaminants, making them potentially harmful to the environment if not properly managed. However, there are many ways to value sludge and use it beneficially rather than simply disposing of it. Here are some of the sludge recovery methods: Composting, Agricultural use, Energy production, Biogas production and Production of construction materials. Using sludge to make bricks has many environmental benefits, including reducing waste, reducing demand for natural resources, decreasing greenhouse gas emissions, and creating sustainable building products. However, it is essential to comply with local and national environmental regulations and implement strict quality controls to ensure the safety and quality of bricks made from sludge.

Citation

Mekki MAZA , ,(2023-09-28), Improving sludge management and transforming waste into sustainable resources,3rd International Conference on Innovative Academic Studies,Konya, Turkey

Geopolymers belong to the aluminosilicate family, essentially composed of a raw material that may be natural, a co-product or an industrial by-product such as blast-furnace slag, fly ash and metakaolin, or another material that essentially contains silica (SiO2) and alumina (Al2O3) and an alkaline solution. The use of geopolymers as cementitious materials is currently growing due to their excellent properties and efficiencies, such as low CO2 emission, high compressive strength, low permeability, enhanced durability, thermal resistance and excellent stability in acidic and alkaline environments. Geopolymers are obtained by alkaline activation, often based on sodium or potassium silicate. Many studies have shown that aluminosilicate materials are activated depending on the type of material used. Alkali-activated mortars were found to have higher compressive strength than cement mortars. Alkali-activated materials represent one of the alternatives available that could replace PC in terms of economy, ecology, mechanical performance and durability. Heat treatment has an influence on the reactivity of materials, and studies show that mortars based on uncalcined (raw) materials give lower strengths than control mortars based on 100% cement. Calcination changes the structure of the material to become amorphous, which improves the compressive strength of mortars, so thermal analysis has a positive influence on the compressive strength of mortars. The mechanical activation of materials containing a percentage of silica and/or alumina consists in increasing grain fineness (specific surface area) through advanced grinding. Heat treatment of raw materials shows significant effects on the mechanical behavior of synthesis product were this later enhance mechanical strength, But it considering more expensive then mechanical activation which more economical. However chemical activation has an interesting effect on the development of compressive strength, but is expensive and difficult to process in an aggressive environment.

Citation

Mekki MAZA , ,(2023-09-28), DIFFERENT TYPES OF ACTIVATION OF SUPPLEMENTARY CEMENTING MATERIALS,3rd International Conference on Innovative Academic Studies,Konya, Turkey

The use of sewage sludge ash, also known as sewage sludge incineration ash (SSIA), as a construction material has gained attention in recent years. This study aims to investigate the effect of SSIA on the durability of equivalent mortar exposed to high temperatures. The exposure of mortar cont5aining SSIA to high temperatures can have various effects on its durability. Some of the potential effects include a reduction in mechanical strength, degradation of the microstructure, weight loss, and the formation of new mineral phases. However, these effects can vary depending on the composition of the SSIA and other components of the mortar, as well as the specific conditions of high-temperature exposure. Further experimental studies are needed to provide more accurate evaluations of the impact of SSIA on the durability of equivalent mortar exposed to high temperatures.

Citation

Mekki MAZA , ,(2023-09-26), Assessing the Durability of Mortar Incorporating Sewage Sludge Ash under High-Temperature Exposure,3rd International Conference on Innovative Academic Studies,Konya/Turkey.

This study examines the effect of aluminum (Al) waste additions on the mechanical performance of mortars at high temperatures. The tested mortars have been formulated with different proportions (0%, 2.5%, 5%, 7.5%, and 10%) by weight of sand after being exposed to five temperatures (50 °C, 150 °C, 200 °C, 400 °C, and 600 °C) without imposed load during heating. Workability, setting time of cement, air content, density, mass loss of mortar, thermal conductivity, porosity and mechanicals strength have been examined. The test results indicate a considerable decrease in workability and strength density of the mortar with the addition of Al. This composite has a well thermal conductivity result with 2.5Al and environmentally friendly than ordinary mortar. Further, the experimental data obtained have suggested that the compressive and the flexural tensile strength have been significantly reduced by 90 % in the mortar samples incorporating 10% Al after being exposed to the high temperature of 600 °C. Moreover, the mechanical strength of that mortar has been quite high at the age of 28 days at elevated temperatures in comparison with that measured at 20 °C. The strength of the mortar with Al can be sufficient for some applications where a lightweight, low-strength mortar is required. The use of Al in the production of low-strength concrete can contribute to more sustainable construction.

Citation

Mekki MAZA , , (2023-09-09), Effect of Aluminum Waste on Mortar Thermo-Mechanical Behavior, Praise Worthy Prize, Vol:14, Issue:5, pages:415-424, Praise Worthy Prize

In the construction field, the current research is oriented to the recovery of materials in general, is especially local materials to fight both the soaring prices that knows the way and at the same time ensured the balance nature by solving the problem of pollution that allows the survival of several species that are the major links to the balance of nature. The objective of our work is to lighten the micro-concrete by adding different percentages of polystyrene, and to improve the fluidity and the mechanical strength of the micro-concrete by the incorporation of adjuvant. The results obtained from this research confirm that the rate of 30% of polystyrene gives the most alleviation, 1.5% of adjuvant gives good fluidity and increases the mechanical strength.

Citation

Mekki MAZA , ,(2023-08-24), Micro concrete admixed with white cement with polystyrene,cukurova,11 th INTERNATIONAL SCIENTIFIC RESEARCHES CONFERENCE,ADANA, TURKEY

In this work we studied a mortar called polyster mortar with white cement. The choice of compositions gives low mortar densities. To remedy this lightness which will influence the mechanical behavior of this mortar, we have incorporated a superplasticizer. Preliminary tests on the dosage and workability led us to vary the dosages of the adjuvant and the rate of polystyrene beads to be introduced into the mortar for the formulations, each batch is prepared in the same way. In fact, the rate of polystene is variable. The purpose of our work is to vary the rate of polystrene and the dosage of superplasticizer in order to obtain the optimum variant.

Citation

Mekki MAZA , ,(2023-01-29), ECO-MORTARS PROPERTIES FORMULATED BY POLYSTYRENE AND MIXED SAND,, V. INTERNATIONAL ANKARA MULTIDISCIPLINARY STUDIES CONGRESS,Ankara, Türkiye.

In recent years, due to the modern lifestyle, industrial and technological progress has led to a significant increase in the quantity and quality of waste. Waste accumulation problem every year is all over the world. The use of materials from waste in buildings compensates for the lack of natural resources, solves the problem of waste management and provides an alternative technique for protection of the environment. In Algeria, the Ministry of Environment demonstrated that the recycling market is estimated at 23 billion Algerian dinars (about 260 million USD). In this vision, policy makers aspire to establish a real industry for recovery and recycling of waste through the development of several sectors such as plastics, aluminum paper and cardboard, metals, glass, wood, etc. This review assesses Aluminum waste (Al) in concrete as a substitute for aggregates and cement. The physical, mechanical and environmental properties of the materials obtained by substitution of raw materials by Al waste were examined and compared to reference materials. Mining waste in cementitious materials offers good compressive strengths, while the porosity of the concrete and/or mortar is a factor influencing its toxicity.

Citation

Mekki MAZA , ,(2023-01-27), RECOVERY OF ALUMINUM WASTES IN BUILDING MATERIALS: A REVIEW,, V. INTERNATIONAL ANKARA MULTIDISCIPLINARY STUDIES CONGRESS,Ankara, Türkiye.

geopolymer paste by alkaline solution (alkali + water glass) were investigated. (e e4ect of the combination of GP and BW on the porosity and absorption of the prepared geopolymer paste was monitored and evaluated by both laboratory and analytical methods. In this paper, three mortars were made with two sources of geopolymer containing 100% BW and 100% GP and blended with 90% GP and 10% BW replacements by mass. (e compressive strength, porosity, and absorption of alkali-activated mortar were concurrently examined. Furthermore, the laboratory results obtained were estimated by the general full factorial design method. Finally, the analysis of variance was performed using the test results to analyze the importance of the e4ect factors and their interactions on the selected responses. (e results concluded that mortar activated combined with 10% BW and 90% GP could be utilized in the industry of construction with minimum pollution problems and environment-friendly building materials, with the e4ect variables signi:cantly a4ecting the responses.

Citation

Mekki MAZA , Nadia TEBBAL , Zine El Abidine.Rahmouni@univ-msila.dz, , (2022-12-12), Use of a Full Factorial Design to Study the Relationship between Water Absorption and Porosity of GP and BW Mortar Activated, Advances in Civil Engineering, Vol:2022, Issue:2022, pages:1-10, Hindawi

The combined use of silica fume (SF) and ceramic waste (CW) for the production of mortar is studied. Sand is replaced by 5%, 10%, 15% and 20% of CW while a fixed 5% percentage (% wt of cement) of SF is used. The results show that the best results are obtained by using silica fume and ceramic waste sand with 15% weight of sand and 5% wt of cement. With the addition of sand ceramic waste (SCW), the mortar compressive strength and density increase, while the porosity displays an opposite trend. The experimental analysis is complemented with theoretical considerations on the matrix strength and related improvements in mechanical behavior. It is shown that the agreement between the experimental values and the estimated values is good.

Citation

ZINE EL ABIDINE Rahmouni , Mekki MAZA , Nadia TEBBAL , Messaouda BELOUADAH , , (2022-06-14), On the Combination of Silica Fume and Ceramic Waste for the Sustainable Production of Mortar,, Fluid Dynamics & Materials Processing 2023, 19(5),, Vol:19, Issue:5, pages:1083-1090, Tech Science Press

This paper presents an experimental study on the influence of metal fibers on the mechanical behaviour of mortar with glass sand. Four mortar mixtures with glass filler and metals fibers are manufactured. The specimens were prepared with three percentages of glass sand (0%, 5%, 10%) and 1%, 2% by vol of steel fibers. The Air-Entraining Agent (A-E-A) dosages at the ratios of 0.08% of cement weight were used. The mechanical tests were carried out on the specimens such as the compressive strength, the tensile strength and the porosity. The results showed that the tensile and bending properties of all different mixtures with fibers are significantly higher compared to the reference mortars. A remarkable decrease has been observed in water, density and compressive strength of mortar with chemical admixture. Moreover, the using 1% volume fraction of steel fibers and 10% glass sand, flexural strength of mortar was completely improved.

Citation

ZINE EL ABIDINE Rahmouni , Nadia TEBBAL , Mekki MAZA , Salim ZITOUNI , , (2022-04-08), Combined impact of replacing dune sand with glass sand and metal fibers on mortar properties, Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials, Vol:32, Issue:2, pages:85-90, IIETA

High performance concrete (HPC) has several advantages in building construction that cannot be achieved using conventional concrete in terms of strength durability, resistance to chemical attack, and workability of high performance concrete are high. The introduction of fillers and additives contributed to the improvement of high-performance concrete (HPC), other parameters also influence the performance of these HPCs, coarse aggregate fraction is known to strongly influence both fresh and hardened concrete’s properties. Consequently, selection of both content and particle size distribution for (HPC) mixture is an important issue regarding the predicted performance of concrete. For to make concrete more improvement , the porosity of the granular skeleton as well as the rheology of our HPC, 3/8 fraction of rolled gravel with smooth and rounded surfaces was introduced, in substitution for the crushed gravel of the same fraction , by testing various combinations of fractions 3/8 of rolled gravel and fraction 8/15 of crushed gravel in the present study, and based on previous results obtained the combinations 35,40 and 45% fraction 3/8 of rolled gravel and 65 , 60 and 55% fraction 8/15 of crushed gravel (binary granular system) respectively, gives a minimal porosity . Super plasticizer and four percentages of pozzolan were experimented. Compressive strength function of coarse aggregate was determined at 7, 14 and 28 days. Results have revealed that the mixtures with modified granule size distribution system ,1.5% of superplasticizer and 5% by weight of pozzolan allow an improvement in the compressive strength of 35.1% relative to the control concrete.

Citation

ZINE EL ABIDINE Rahmouni , Salim ZITOUNI , Mekki MAZA , Nadia TEBBAL , , (2022-02-21), Impact of Rolled and Crushed Aggregate with Natural Pozzolan on the Behavior of HPC, Annales de chimie - Sciences des matériaux, Vol:46, Issue:1, pages:45-52, IIETA

Recycling and recovery of waste are now considered as a solution for the future to protect the environment. The marble processing workshops on the other hand, generate a large amount of waste in the form of powder and small parts. Due to these facts, the aim of this study is to valorize marble waste in the form of powder and crushed aggregates (sand) as additions in cementitious matrix building materials. The characterization of the materials used to formulate mortars based on natural dune sand with marble powder and mortars based on mixed sand (dunes sand and crushed sand) and marble powder was measure. In this sense, several series have been studied, varying the addition rate of the marble powder in order to reduce the porosity of the cement matrix, using crushed marble sand to increase the granular cohesion and using of a reducing water admixture (MEDAPLAST SP40) for more performance mortars. Very appreciable results were observed for a dosage of 15% of marble powder and for the combination of 15% of marble powder with 20% of crushed marble sand. This research recommends recycling 35% of marble waste in the cement matrix that contribute effectively to the preservation of the environment.

Citation

Mekki MAZA , Salim ZITOUNI , Nadia TEBBAL , ZINE EL ABIDINE Rahmouni , , (2021-12-26), Combined Effect of Marble Waste as Powder and Aggregate Form on the Proprieties of the Mortar, Annales de Chimie - Science des Matériaux, Vol:45, Issue:6, pages:467-476, Annales de Chimie

As part of protecting the environment from carbon dioxide emissions, all research aims to reduce the use of cement in concrete with cheaper and energy efficient materials. Geopolymer mortar is an environmentally friendly mortar made from industrial solid waste and by-products such as crystalline slag (CS). This research aims to produce a geopolymer mortar from local materials available in Algeria which are not sufficiently valued at present. The aim of this study is to provide geopolymer mortar at high temperatures, operating with a constant hardening temperature of around 60° C. The alkaline activator used in this study was a combination of sodium silicate (Na2SiO3) and 10 M NaOH solution. In addition, crystalline geopolymer mortars (MCS) as the binder material at a curing temperature of 60 °C, ratios of two mixtures of binder were prepared by substituting the sand with 40% CS and 100% CS. For this purpose, the mortar sample with the highest compressive strength was subjected to temperatures of 200, 400, 600 and 800 °C for exposure times of 10 °C per minute and changes in temperature and changes in the physical and mechanical properties was analyzed. As a result of the experiments, the highest mechanicals values were obtained from the mortar samples with a 40% CS content. Following the high temperature tests, 400 °C and 600 °C were determined as critical temperatures for changes in mechanical properties and changes in physical properties, respectively. However, the geopolymer mortars lost around 60% of strength at 800 °C which is the final temperature.

Citation

Mekki MAZA , Nadia TEBBAL , ZINE EL ABIDINE Rahmouni , , (2021-09-02), Combined effect of high temperatures and crystalline slag on the mechanical behavior of geopolymers mortars, . Materials Today: Proceedings, Vol:49, Issue:4, pages:1051-1055, sciencedirect

This study examines the effect of the additions of silica fume and super plasticizer on the mechanical performance of high performance concretes at high temperatures. The tested concretes are formulated with 5% silica fume and two dosages of super plasticizers in the ratio of (2%, 2.5%) the weight of cement after having been exposed to four maximum temperatures, 200 °C, 400 °C, 600 °C and 900 °C without any imposed load during the heating. The results obtained show that the mechanical resistance at 28 day increases with the degree of temperature compared to that measured at 20 °C. On the contrary, a clear decrease is observed between 600 °C and 900 °C. However, material composition seems to have great influence on the mechanical strength.

Citation

Mekki MAZA , Nadia TEBBAL , ZINE EL ABIDINE Rahmouni , , (2017-09-08), 4) COMBINED EFFECT OF SILICA FUME AND ADDITIVE ON THE BEHAVIOR OF HIGH PERFORMANCE CONCRETES SUBJECTED TO HIGH TEMPERATURES,, Mining Science, Vol:24, Issue:, pages:129-145, mining Science