Published in 2023

Improvement of mechanical and physical properties of normal concrete using mulberry extract as an admixture

Authors: Hersh F. Mahmood, Hooshang Dabbagh, Azad A. Mohammed

Journal: Asian Journal of Civil Engineering

Published in 2022

Investigation of metakaolin and steel fiber addition on some mechanical and durability properties of roller compacted concrete

Authors: Masood Abu-Bakr, Hersh F. Mahmood, Azad A. Mohammed

Journal: Case Studies in Construction Materials

Published in 2022

Energy-Performance Concrete Roof Slabs in Hot Climates Using Air Ventilation and False Ceiling with Baffles Shape: A Numerical and Modeling Study

Authors: -

Journal: Journal of Studies in Science and Engineering

Published in 2022

Influence of Using Different Types of Fibers on The Mechanical Properties of Roller Compacted Concrete A Review

Authors: -

Journal: The Journal of Duhok University

Published in 2022

Fresh, Mechanical, and Durability Properties of Concrete Contains Natural Material as an Admixture, an Overview

Authors: -

Journal: Journal of Studies in Science and Engineering

Published in 2022

Investigation of Strengthening Reinforced Concrete Beam-Column Connection Wrapped with Fiber-reinforced Polymer

Authors: -

Journal: Journal of Studies in Science and Engineering

Published in 2022

Seismic Performance of I-shaped Beam-column Joint with Cubical and Triangular Slit Dampers Based on Finite Element Analysis

Authors: -

Journal: Journal of Studies in Science and Engineering

Published in 2021

Comparative study on using chemical and natural admixtures (grape and mulberry extracts) for concrete

Authors: Hersh F. Mahmood, Hooshang Dabbagh, Azad A. Mohammed

Journal: Case Studies in Construction Materials

Published in 2020

[PDF] from uod.ac NATURAL ADMIXTURE AS AN ALTERNATIVE FOR CHEMICAL ADMIXTURE IN CONCRETE TECHNOLOGY: A REVIEW

Authors: Hersh F Mahmood.Hooshang Dabbagh,Azad A Mohammed

Journal: journal of Duhok University

Description:

The use of chemical admixtures in concrete is a common practice in modern construction. Although chemical admixtures improve the properties of concrete but also create leaching problem and they are responsible for environmental pollution. The Impact of chemical admixture on environmental can occur when chemical admixtures are exposed to the environment or when dumping concrete granulate containing admixtures after the demolition of a structure or when concrete granulate is used as gravel replacement in construction and as the concrete admixtures are very readily soluble in water, hence create an environmental problem due to leaching. This paper presents a critical review of several natural materials used in concrete as an admixture that influences the mechanical and durability properties of concrete. This kind of admixtures can be considered as an eco-friendly one with regard the impact on the environment and of low cost compared with the chemical admixture

Published in 2020

Effect of Chemical Activators on the Compressive Strength of Cement-Slag Mortar

Authors: Hersh F Mahmmod

Journal: IOP Conference Series: Materials Science and Engineering

Description:

The reaction of ground granulated blast furnace slag (GGBFS) with water is slower compared to the hydration of ordinary Portland cement. This led researchers to concentrate on increasing the hydration rate of the GGBFS. Previous studies were done by (SCA) showed that GGBFS can be used with activators or a certain amount of Portland cement. Also, they found that alkali hydroxides and GGBFS can be reacted alone without any calcium hydroxide obtained from Portland cement hydration to obtain a strong cement paste in applications. This experimental study conducted by the TS EN 196-1 standard, with the ratio (79:21)% slag to cement and 0%, 1%, 2%, 3% and 4% levels of activators (CaCO3, Ca (OH) 2, Na2SO4, K2SO4 and CaSO4.2H2O); results indicates that with above ratio slag can be used with activator of (Na2SO4, K2SO4 and CaSO4.2H2O) ,greater compressive strength of 5-6 MPa was obtained at 2 and 7-day curing ages when K2SO4 was used as an activator at the dosages of 3% and 4%, while the activator (CaSO4.2H2O ) can improve all ages, and there was not a clear difference among control mixture without activator and slag-mortars activated by CaCO3 and Ca (OH).