Properties and Microstructure of Concrete Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 December 2023) | Viewed by 1732

Special Issue Editor


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Guest Editor
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Interests: tunnel engineering; structural engineering; materials engineering

Special Issue Information

Dear Colleagues,

Cement concrete, as the most widely used building material in the world, has been widely adopted in buildings, highways, bridges, and airports and plays a very important role in each, owing to its advantages of low price and high strength durability. Based on the special operating environments and high-performance requirements, cement-based materials can be categorized either as shotcrete, engineered cementitious composite (ECC), or ultra-high-performance concrete (UHPC). Shotcrete is the single-shell rock support lining in tunnels, and its performance is crucial. In harsh environments, the deterioration of shotcrete and the interface between shotcrete and the surrounding rock have been subject to intense research interest in recent years. Although ECC and UHPC, as the complete theoretical design systems of concrete, have been developed over 30 years, the damage mechanisms of ECC and UHPC under a variety of aggressive environments are still unclear. Moreover, tremendous modification methods are being developed by researchers to enhance their durability. In recent years, applying nano-structured materials in cement has been recognized as an efficient way to improve the performance of concretes. Nano-modification will be the most prominent method of concrete modification in the future.

Prof. Dr. Shengai Cui
Guest Editor

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Keywords

  • cementitious materials
  • durability
  • damage mechanism
  • modification
  • nano-materials

Published Papers (1 paper)

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Research

20 pages, 4259 KiB  
Article
Impact of Partial Replacement of Cement with a Blend of Marble and Granite Waste Powder on Mortar
by Daniel Mulat Nega, Begashaw Worku Yifru, Woubishet Zewdu Taffese, Yalew Kassa Ayele and Mitiku Damtie Yehualaw
Appl. Sci. 2023, 13(15), 8998; https://doi.org/10.3390/app13158998 - 06 Aug 2023
Cited by 4 | Viewed by 1281
Abstract
The purpose of this study is to examine the effects of partially replacing cement with a blend of marble waste powder (MWP) and granite waste powder (GWP) in mortar, with the goal of reducing the environmental harm caused by cement. The investigation included [...] Read more.
The purpose of this study is to examine the effects of partially replacing cement with a blend of marble waste powder (MWP) and granite waste powder (GWP) in mortar, with the goal of reducing the environmental harm caused by cement. The investigation included an analysis of the distinctive properties of the two waste powders individually, as well as initial tests with various ratios to determine the optimal combination that yields the highest strength. It was observed that a 50% MWP to 50% GWP blend produced the most substantial strength. Subsequently, the effect of partial replacement of cement with the blend of marble and granite waste powder (MGWP) at various increments of 5%, ranging from 0% to 30%, was evaluated by subjecting the mortar to numerous tests to assess its workability, physical, mechanical, durability, and microstructural properties. The analysis of the employed waste powders confirmed that the GWP can be classified as a natural pozzolan material belonging to Class N. As the proportion of MGWP increased, the workability of the mortar mixes decreased. However, incorporating MGWP up to 15% resulted in enhancements in bulk density, compression strength, and homogeneity, with the best performance observed at a 10% MGWP content. Microstructure analysis confirmed that the addition of MGWP enhanced the bonding of C–S–H and C–H, leading to a denser morphological structure in the mixes, particularly at a 10% MGWP content. The utilization of MGWP not only significantly reduced the carbon footprint associated with cement production but also fostered sustainability. Full article
(This article belongs to the Special Issue Properties and Microstructure of Concrete Materials)
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