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Effect of Additives/Admixtures on the Properties of Concretes and Cementitious...
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Effect of Additives/Admixtures on the Properties of Concretes and Cementitious Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 1862

Special Issue Editors

Dr. Mengjun Chen

E-Mail Website
Guest Editor
Geotechnical and Structural Engineering Research Center, School of Qilu Transportation, Xinglong Mountain Campus, Shandong University, No. 12550, East Second Ring Road, Jinan 250002, China
Interests: low-carbon cementitious materials; functional admixtures for cement-based/solid waste-based materials; new materials for tunnelling and underground construction
Dr. Jiwen Bai

E-Mail Website
Guest Editor Assistant
Geotechnical and Structural Engineering Research Center, School of Civil Engineering, Civil Engineering Building, Qianfoshan Campus, Shandong University, No. 17923, Jingshi Road, Jinan 250061, China
Interests: development of grouting materials and the mechanism of reinforcement diffusion; investigation of cementitious materials derived from solid waste and their practical implementation

Special Issue Information

Dear Colleagues,

In today's cement and concrete industry, chemical admixtures have become one of the essential components of cement-based materials. The addition of a certain amount of chemical admixture to cement concrete can improve the defects of the cementitious material itself or improve the performance of the cementitious material.

There is a wide range of chemical admixtures in cement concrete, such as water-reducing agents, retarders, early strength agents, accelerators, quick setting agents, air-entraining agents, etc. However, regardless of the admixture added to achieve a particular effect, the addition of admixture will affect the cement hydration process. With the high performance of cement and concrete and the wide application of various chemical admixtures and mineral admixtures, the systematic study of the effect of various admixtures on cement hydration is of great theoretical and engineering significance in terms of understanding the interaction between different chemical admixtures and cement and regulating the hydration process of cement.

This Special Issue will bring together the latest developments in the field of concrete admixtures. Articles in this Special Issue will cover a variety of topics including, but not limited to, the preparation of new concrete admixtures, alkali-activated material admixtures, and high-performance composite admixtures.

Dr. Mengjun Chen
Dr. Jiwen Bai
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • concrete admixtures
  • chemical admixture
  • cement hydration
  • cementitious materials
  • solid waste utilization
  • property modulation

Published Papers (3 papers)

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Research

24 pages, 10851 KiB  
Article
Influence of TiO2 Nanoparticles on the Physical, Mechanical, and Structural Characteristics of Cementitious Composites with Recycled Aggregates
by Carmen Teodora Florean, Horațiu Vermeșan, Timea Gabor, Bogdan Viorel Neamțu, Gyorgy Thalmaier, Andreea Hegyi, Alexandra Csapai and Adrian-Victor Lăzărescu
Materials 2024, 17(9), 2014; https://0-doi-org.brum.beds.ac.uk/10.3390/ma17092014 - 25 Apr 2024
Viewed by 235
Abstract
The aim of this study is to analyze the effect of the addition of TiO2 nanoparticles (NTs) on the physical and mechanical properties, as well as the microstructural changes, of cementitious composites containing partially substituted natural aggregates (NAs) with aggregates derived from [...] Read more.
The aim of this study is to analyze the effect of the addition of TiO2 nanoparticles (NTs) on the physical and mechanical properties, as well as the microstructural changes, of cementitious composites containing partially substituted natural aggregates (NAs) with aggregates derived from the following four recycled materials: glass (RGA), brick (RGB), blast-furnace slag (GBA), and recycled textolite waste with WEEE (waste from electrical and electronic equipment) as the primary source (RTA), in line with sustainable construction practices. The research methodology included the following phases: selection and characterization of raw materials, formulation design, experimental preparation and testing of specimens using standardized methods specific to cementitious composite mortars (including determination of apparent density in the hardened state, mechanical strength in compression, flexure, and abrasion, and water absorption by capillarity), and structural analysis using specialized techniques (scanning electron microscopy (SEM) images and energy dispersive X-ray spectroscopy (EDS)). The analysis and interpretation of the results focused primarily on identifying the effects of NT addition on the composites. Results show a decrease in density resulting from replacing NAs with recycled aggregates, particularly in the case of RGB and RTA. Conversely, the introduction of TiO2 nanoparticles resulted in a slight increase in density, ranging from 0.2% for RTA to 7.4% for samples containing NAs. Additionally, the introduction of TiO2 contributes to improved compressive strength, especially in samples containing RTA, while flexural strength benefits from a 3–4% TiO2 addition in all composites. The compressive strength ranged from 35.19 to 70.13 N/mm2, while the flexural strength ranged from 8.4 to 10.47 N/mm2. The abrasion loss varied between 2.4% and 5.71%, and the water absorption coefficient varied between 0.03 and 0.37 kg/m2m0.5, the variations being influenced by both the nature of the aggregates and the amount of NTs added. Scanning electron microscopy (SEM) images and energy dispersive X-ray spectroscopy (EDS) analysis showed that TiO2 nanoparticles are uniformly distributed in the cementitious composites, mainly forming CSH gel. TiO2 nanoparticles act as nucleating agents during early hydration, as confirmed by EDS spectra after curing. Full article
(This article belongs to the Special Issue Effect of Additives/Admixtures on the Properties of Concretes and Cementitious Composites)
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11 pages, 4780 KiB  
Article
Experimental Study of the Moisture Resistance of Cement Mortar Using Pozzolan Materials and Calcium Stearate
by Jang Hyun Park and Chang Bok Yoon
Materials 2024, 17(5), 1014; https://0-doi-org.brum.beds.ac.uk/10.3390/ma17051014 - 22 Feb 2024
Viewed by 645
Abstract
Nanosilica and diatomite are pozzolanic resources rich in SiO2. In this study, the purpose of this study was to improve the moisture resistance of the specimen by producing a mixed material using pozzolanic materials and calcium stearate and adding it to [...] Read more.
Nanosilica and diatomite are pozzolanic resources rich in SiO2. In this study, the purpose of this study was to improve the moisture resistance of the specimen by producing a mixed material using pozzolanic materials and calcium stearate and adding it to cement mortar while stirring. The results showed that the hydration reaction was not activated when calcium stearate adhered to the fine particles of nanosilica; it existed simply in the form of a filler inside the specimen. Diatomite, due to its atypical particles and porosity, may have greater water tightness than nanosilica because of the pozzolanic reaction in particles to which calcium stearate is not attached. Full article
(This article belongs to the Special Issue Effect of Additives/Admixtures on the Properties of Concretes and Cementitious Composites)
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19 pages, 5067 KiB  
Article
Analysis of Durability of Watertight Concretes Modified with the Addition of Fly Ash
by Janina Adamus and Bogdan Langier
Materials 2023, 16(17), 5742; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16175742 - 22 Aug 2023
Cited by 1 | Viewed by 669
Abstract
The growing demand for watertight concrete structures is conducive to the development of research in this area, but their results are rarely published. In order to partially fill this gap, the authors of the publication present the results of research into the effect [...] Read more.
The growing demand for watertight concrete structures is conducive to the development of research in this area, but their results are rarely published. In order to partially fill this gap, the authors of the publication present the results of research into the effect of fly ash addition on the watertightness of concrete. Prior to the tests, a recipe for a concrete mix with the addition of a sealing admixture modified with fly ash was developed. The following properties were analyzed: consistency of the concrete mix, air content in the concrete mix, compressive strength of concrete, depth of penetration of water under pressure, and frost resistance of concrete for F150 level. The work meets the expectations of the construction industry with respect to the production of concrete structures resistant not only to the penetration of water into concrete but also resistant to aggressive substances dissolved in water that accelerate the destruction of concrete and corrosion of reinforcement bars. Based on the test results, it was found that the addition of fly ash to the concrete mix enhances the positive impact of the applied sealing admixture, increasing the tightness of the concrete. It reduces the depth of penetration of water under pressure and therefore increases the frost resistance of concrete. Full article
(This article belongs to the Special Issue Effect of Additives/Admixtures on the Properties of Concretes and Cementitious Composites)
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