2023年发表

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

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

发表期刊: Asian Journal of Civil Engineering

2022年发表

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

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

发表期刊: Case Studies in Construction Materials

2022年发表

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

作者: -

发表期刊: Journal of Studies in Science and Engineering

2022年发表

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

作者: -

发表期刊: The Journal of Duhok University

2022年发表

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

作者: -

发表期刊: Journal of Studies in Science and Engineering

2022年发表

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

作者: -

发表期刊: Journal of Studies in Science and Engineering

2022年发表

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

作者: -

发表期刊: Journal of Studies in Science and Engineering

2021年发表

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

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

发表期刊: Case Studies in Construction Materials

2020年发表

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

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

发表期刊: journal of Duhok University

论文简介:

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

2020年发表

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

作者: Hersh F Mahmmod

发表期刊: IOP Conference Series: Materials Science and Engineering

论文简介:

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).