Mohamed Heikal

Mohamed Heikal
Benha University · Department of Chemistry

Ph. D.
Vice Dean of Faculty of Science for Education and Student Affairs, Benha University

About

156
Publications
44,616
Reads
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2,823
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Introduction
Prof. Dr. Mohamed Heikal Professor of Inorganic Chemistry and Building Materials at Chemistry Department, Faculty of Science, Benha University. Dr. Mohamed Heikal interested in Chemistry and Technology of Cements especially the cements containing industrial by-products, Physico-chemical and microstructure of blended and pozzolanic cements
Additional affiliations
September 2013 - present
Imam Muhammad bin Saud Islamic University
Position
  • Professor (Full)
Description
  • Inorganic Chemistry
September 2013 - December 2014
Imam Muhammad bin Saud Islamic University
Position
  • Professor (Full)
October 2008 - present
Benha University
Position
  • Professor (Full)
Description
  • Professor of Inorganic Chemistry
Education
March 1993 - August 1996
Zagazig University
Field of study
  • Cement Chemistry
October 1990 - January 1992
Zagazig University
Field of study
  • Cement Chemistry
September 1984 - May 1988
Zagazig University
Field of study
  • Special Chemistry

Publications

Publications (156)
Article
Full-text available
The aim of the present work is to study the characteristics of alkali activated Egyptian slag (GBFS) mixed with different contents of Na2O and SiO2. The rate of the kinetic of activation of GBFS has been studied by electrical conductivity, FTIR, DTA/TGA, XRD and SEM techniques. Electrical conductivity of alkali activated slag systems depends mainly...
Article
Full-text available
The work aims to study the effect of substitution of nano-silica (NS) on the behavior of composite cement pastes containing ordinary Portland cement (OPC) and blast-furnace slag (GBFS) exposed to elevated temperature up to 1000 °C. The composite cements are composed of different amount of NS up to 6 mass% as well as 30–60 mass% GBFS. The behavior o...
Article
Full-text available
This article aims to study the physico-mechanical and fire resistance of cement pastes containing Al2O3 nano-particles. The results show that the water of consistency increases as well as the initial and final setting times accelerated with NA content up to 6 mass%, indicating that NA enhances the hydration reaction of OPC cement phases. The compre...
Article
Full-text available
This manuscript aims to investigate the effect of hydration characteristics, textural properties and fire resistance of cement pastes containing Fe2O3 nano-particles (NF). NF prepared from C2FeO4.2H2O at 300 and 500 °C at heating rate 5 °C min−1 for 2 h soaking time. TEM shows the crystal size of NF was 10–20 nm, with surface area of 50.51 m2 g−1....
Article
Full-text available
The beneficial use of alkali-activation/sintering process in the fabrication of open-celled cellular materials and lead solidification/stabilization (S/S) is the biggest challenge of the present work. Waste glass (WG), red-clay brick waste (RCBW), and lead-bearing-sludge (LBS) were used as silicate-rich-wastes in the foaming process. Porous materia...
Article
Full-text available
This work focuses on the individual impact of nano- and ultrafine micro magnesia (N–MgO and UM-MgO, respectively) on the early performance of high volume fly ash (FA)-blended-cement mortar (CM). N–MgO and UM-MgO were synthesized using a thermal treatment of lightweight hydromagnesite at 550 and 1100 °C, respectively. Different contents of MgOs (1,...
Article
Full-text available
The objective of the study is to produce a more durable binder by preparing different mixes from Blastfurnace-slag (GBFS), By-pass cement dust (CKPD), and/or micro-silica (MS). Conductivity, compressive strength (CS), bulk density (BD), total porosity (TP), combined water (Wn), combined slag, total sulfate (TS) and total chloride (TC) contents used...
Article
Full-text available
The work aimed to study the impact of nano-Fe2O3 on the characteristics and durability resistance against SO4²⁻ or Cl⁻ anions attack. Nano-Fe2O3 prepared from the heating of Fe(CH3COO)2OH at 300 °C (NFI) and 450 °C (NFII) at soaking time 2hrs. The prepared nano-Fe2O3 showed the accumulation of hematite and fine-ferrihydrite crystals having grain si...
Article
Full-text available
The present work aims to investigate the influence of clay nanoparticles (CNP) on the mechanical, physical and microstructure cement pastes composites. The cement paste composites were formulated by adding 20-60 mass% fly ash (FA), fine blast furnace slag (FBFS) and/or 6 mass% clay nanoparticles. The physico-chemical properties of the cement paste...
Article
Full-text available
In this paper, the corrosion of C-steel in OPC-fly ash-composite cement pastes (OPC-FA-CCP) was examined with different fly ash (FA) contents (0, 10, 25 and 50 mass%) and immersion times in the absence and presence of spinach extract as a green-corrosion inhibitor. The effect of replacing FA in cement composition on its physical, chemical, mechanic...
Article
Full-text available
The impact of silica-nano-particles (SNP) onto the physicochemical and microscopic characteristics of composite-cements containing 40-60 mass% fly-ash (FA), and/or granulated-slag (GS) were studied. The physico-mechanical and microscopic-characteristics of the composite cement-pastes were enhanced by the replacement of 4 mass% SNP, especially the e...
Article
Full-text available
The impact of silica-nano-particles (SNP) on the hydration characteristics of composite cement containing flyash (FA) and/or fine granulated slag (FGS) was investigated. The physico-chemical characteristics of different composite-pastes are studied in the presence of 4mass% SNP and 40% FA and/or FGS with the existence of 1mass% polycarboxylate supe...
Article
Full-text available
A cleaner production of one-part alkali activated cement (AAC) was implemented by mixing chemically treated concrete waste (CTC) with slag. The treatment process was conducted by the addition of NaOH to concrete waste (CoW) at NaOH to CoW weight ratios of 0.2, 0.1, and 0.05 (namely, CTC-1. CTC-2, and CTC-3, respectively), followed by mixing with wa...
Article
Full-text available
In the present work, sustainable use of cement kiln dust (CKD) and feldspar (FS) in the production of pozzolanic materials with different reactivity and whiteness were investigated. The proposed method includes thermal treatment of CKD and FS at 1000 °C in the presence of sodium hydroxide to convert crystalline- FS/CKD -structure to amorphous one....
Article
Full-text available
The present work demonstrates the utilization of three important industrial by-products; fly ash (FA), ground blast-furnace slag (GBFS), and lead-bearing sludge (LS) in preparing geopolymer as a replacement for cement binder. The feasibility of preparing high-performance geopolymers by mixing various ratios of industrial by-product fractions (FA, G...
Article
Full-text available
In the present work, sustainable use of cement kiln dust (CKD) and feldspar (FS) in the production of pozzolanic materials with different reactivity and whiteness were investigated. The proposed method includes thermal treatment of CKD and FS at 1000 �C in the presence of sodium hydroxide to convert crystalline- FS/CKD -structure to amorphous one....
Article
Full-text available
The motivation behind this work is to evaluate the impact of nano-magnesium calcite (NMC) waste on the performance of cement mortar (CM) and its resistivity to sulfate attack. The addition of urea and urease enzyme to ground water resulted in the removal of Ca2+ and Mg2+ as NMC precipitate (byproductof treatment process). As a beneficial recycling...
Article
Full-text available
The motivation behind this work is to evaluate the impact of nano-magnesium calcite (NMC) waste on the performance of cement mortar (CM) and its resistivity to sulfate attack. The addition of urea and urease enzyme to ground water resulted in the removal of Ca2+ and Mg2+ as NMC precipitate (byproduct of treatment process). As a beneficial recycling...
Article
Full-text available
This work highlights a simplistic route for synthesizing zinc oxide nanoparticles via a direct chelating reaction achieved by adding zinc nitrate to dicarboxylic acids namely malonic, succinic and tartaric followed by slow evaporation to form the subsequent complexes. The resulting complexes were thermally treated at 450oC for 2h to acquire the ZnO...
Article
Full-text available
This study evaluates the synergistic impact of nano-silica (NS) and nano-clay (NC) on the hydration characteristics and microstructure of ordinary Portland cement (OPC) paste. Two main parameters, which strongly affect the physico-chemical and mechanical performance of OPC-pastes, including the hybrid NS and NC mass% (0, 1, 2, 4 and 6 wt% at NS:NC...
Article
Full-text available
An experimental investigation was performed to evaluate the impact of curing conditions on the physico-mechanical properties and firing resistivity of cement mortar (CM) containing reactive magnesium oxide (MgO). Three different curing media including Tap water (TW), normal carbonation (NC) and accelerated carbonation (AC), have been applied. Two M...
Article
Full-text available
This work aims to prepare an eco-friendly binder from alkali-activated aluminosilicate solid industrial wastes. Eco-friendly binders provide a solution to the present ecological problem of producing non-portland-cement binders. Cement kiln dust (CKD) and ground granulated blast-furnace slag (GGBS) by-products were used to prepare the binder from al...
Article
Full-text available
This article aims to study the pozzolanic activity of silica fume by the reaction with Ca(OH)₂ (CH) at room temperature. The pozzolana includes the natural or artificial type containing amorphous alumina or silica structure. It can be added or substituted with OPC in concrete that can react with CH liberated during the hydration of cement forming...
Article
Full-text available
Kaolin is a clay mineral that has a wide application in the industry, depending on its purity. The quality of kaolin mined around the world is depleting especially with depth and rate of mining. Consequently the usability of this mineral is threatened by the presence of some inherent impurities. Beneficiation enhances kaolin applications; hence, it...
Article
Full-text available
The effect of partial replacement of ordinary Portland cement (OPC) with nano-clay (NC) on the performance of physico-chemical, mechanical, hydration characteristics and microstructure of composite cement pastes containing ordinary Portland cement (OPC) and ground blast-furnace slag (GBFS) was studied. Initial and final setting times are accelerate...
Thesis
Blast-Furnace slags BFS are extremely interesting by-products of pig iron manufacture. Two types of slag are obtained; these are air-cooled slag (which is cooled by air and has less hydraulic activity). The granulated blast furnace slag (GBFS) (which is cooled rapidly by excess water and gives its latent hydraulic activity). Therefore, granulated s...
Article
Full-text available
The durability of concrete has been a major concern of civil engineering. Chemical attack caused by aggressive waters is one of the factors causing damage to concrete. The effect of nano-silica (NS) on the durability of composite cement pastes and mortars cements containing granulated blast-furnace slag (GBFS) subjected to seawater attack has been...
Article
Full-text available
GROUNDED blast furnace slag GBFS is one of common supplementary cementitious materials in Portland cement concrete, and is capable of improving the performance of concrete and reducing the costs. There are strong environmental and energy reasons for developing a wide range of pozzolanic cements. The aim of this work is to study the effect of substi...
Conference Paper
Full-text available
This work aims to study the effect of partial substitution of ordinary Portland cement (OPC) by fly ash (FA) on the physico-chemical and mechanical properties of the hardened on the properties of composite cement pastes (CCP). The effect of FA content was studied by the determining chemically combined water, free lime contents, total porosity, gel/s...
Article
Full-text available
This paper aims to study the effect of thermally treatment temperatures on composite cements containing nano-silica (NS) and blast-furnace slag (GBFS). The composite cements are composed of NS from 0, 1 and 4 mass% and GBFS from 0, 25, 50 and 65 mass%. The thermal resistance of composite cement pastes was studied after the specimens subjected to th...
Article
Full-text available
Three mixes were prepared from calcium aluminate cement (CAC) and 20 mass% water-cooled (WCS) slag or air-cooled slag (ACS). The pastes were prepared with the required water of standard consistency, cured under tap water until time of testing (1, 3, 7 and 28 days). The durability of calcium aluminate blended cement was investigated by immersing the...
Article
Full-text available
The aim of the present work is to study the influence of citric acid (CA) as retarder on the properties of prompt cement pastes. The dosages of CA were 0.50, and 0.75, 1.00 and 1.25 mass% of prompt cement. The initial and final setting times, bulk density, compressive strength, total porosity, and hydration kinetics such as free lime, combined wate...
Article
Full-text available
This research aims to produce cementless eco-friendly binding material using alkaline activation of blast-furnace slag (GBFS) and microsilica (MS). The preparation of cementless binding material was conducted with different GBFS-MS mass ratios (100:0; 98:2; 96:4; 92:8) with 0.75:0.50; Na2O:SiO2 mol kg-1of GBFS-MS. The characteristics and durability...
Data
The effect of nano-silica (NS) on the hydration characteristics, thermal expansion and microstructure of cement pastes and mortars was studied. OPC was replaced with NS up to 6.0%. The presence of NS increases the required water of standard consistency and elongated the setting times. The results of chemically combined water, free portlandite, pH,...
Article
Full-text available
The effect of nano-silica (NS) on the hydration characteristics, thermal expansion and microstructure of cement pastes and mortars was studied. OPC was replaced with NS up to 6.0%. The presence of NS increases the required water of standard consistency and elongated the setting times. The results of chemically combined water, free portlandite, pH,...
Article
Full-text available
When a concrete structure is exposed to fire and cooling, some deterioration in its chemical resistivity and mechanical properties takes place. This deterioration can reach a level at which the structure may have to be thoroughly renovated or completely replaced. In this investigation, four types of cement mortars, ground clay bricks (GCB)/sand nam...
Article
Full-text available
This work aimed to investigate the impact of delayed addition time (DAT) of sulphonated naphthalene formaldehyde (SNF) superplasticizer on the durability and fire resistance of SRC–SF composite cement pastes immersed in both 4% MgCl2 or 4% MgSO4 solutions as well as at elevated temperatures up to 800 °C, respectively. The results indicate that, the...
Article
Full-text available
The aim of the present work is to study the effect of active belite on the hydration of nano-C4A3 and C4A by the determination of the hydration products using XRD, DSC techniques and the combined water contents as a function of curing time. The results revealed that the active β-C2S prevents the formation of crystalline ettringite and monosulfate h...
Article
Full-text available
The aim of the present work is to evaluate the effect of nano-silica (NS) on physico-chemical, compressive and flexural strengths of OPC-granulated slag blended cement pastes and mortars. Different mixes were made with various amounts of NS, OPC and granulated blast-furnace slag (GBFS) and hydrated for 3, 7, 28 and 90 days. The hydration behavior w...
Article
Full-text available
When a concrete structure is exposed to fire and cooling, some deterioration in its chemical resistivity and mechanical properties takes place. This deterioration can reach a level at which the structure may have to be thoroughly renovated or completely replaced. In this investigation, four types of cement mortars, ground clay bricks (GCB)/sand nam...
Data
Abstract The aim of the present work is to evaluate the effect of nano-silica (NS) on physicochemical, compressive and flexural strengths of OPC-granulated slag blended cement pastes and mortars. Different mixes were made with various amounts of NS, OPC and granulated blast-furnace slag (GBFS) and hydrated for 3, 7, 28 and 90 days. The hydration be...
Article
Full-text available
The work aimed to evaluate the effect of delayed addition time of SSFP condensate on the physico-mechanical characteristics and durability of 10% micro-silica (MS)-sulphate resisting (SRC) cement pastes immersed in 4% MgCl2 or 4% MgSO4 solutions or at elevated temperatures up to 800 °C. The results show that the compressive strength and bulk densit...
Article
Full-text available
Pozzolanic activity of dealuminated kaolin (DK) and burnt kaolinite clay (BK) was studied using cement kiln dust (CKD) or hydrated lime (CH) as activators. The different solid dry mixtures made of DK–CKD, BK–CKD, DK–CH, BK–CH, SF–CKD and SF–CH were hydrated in the suspension form, while paste hydration was done using DK–BK–CKD mix. Chemically combi...