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Open Access

ISSN 2689-5846

© 2021 by the authors; CC BY 4.0 licence

Recent Progress in Materials , Volume 3 , Issue 4 (2021)

Pages: 218

Published: February 2022

(This book is a printed edition that was published in  Recent Progress in Materials)

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Cover Story: This paper studies the durability of alkali-activated materials made with blastfurnace slag. The slag is basic and amorphous, adequate for alkali activation (CaO/SiO2 = 1.41 and Al2O3/SiO2 = 0.34). Melilite is its main constituent, in an isomorphous solid solution with gehlenite (end-member). The Na2SiO3+NaOH-activated, slag materials showed the greatest resilience to frost, thermal/moisture and salt cycling. They remained intact and showed the greatest strengths after cycling, and an unaltered microstructure including Ca-Al-silicates (hydrogarnet-gehlenite cements). The NaOH and the Na2SiO3-activated materials were slightly damaged displaying efflorescence and microcracks.View this paper

Volume 3,Issue 4

Open Access Original Research

Cradle-to-Grave Life-Cycle Assessment of Cellulosic Fiberboard

Received: 24 August 2021;  Published: 21 December 2021;  doi: 10.21926/rpm.2104049

Abstract

According to the United Nations Environment Programme (UNEP), the construction and operation of buildings accounted for nearly 38% of total global energy-related CO₂ emissions in 2019. The construction sector has been striving to use more low-carbon footprint building products to mitigate climate change and enhance environmentally preferable purchasing. Over the last several decades, there has been substantial growth in engineered wood products fo [...]

Open Access Research Article

Life Cycle Assessment of North American Laminated Strand Lumber (LSL) Production

Received: 18 June 2021;  Published: 15 December 2021;  doi: 10.21926/rpm.2104048

Abstract

Raw materials for buildings and construction account for more than 35% of global primary energy use and nearly 40% of energy-related CO₂ emissions. The Intergovernmental Panel on Climate Change (IPCC) emphasized the drastic reduction in GHG emissions and thus, wood products with very low or negative carbon footprint

Open Access Original Research

Pozzolanic and Cementing Activity of Raw and Pyro-Processed Saudi Arabian Red Mud (RM) Waste

Received: 28 September 2021;  Published: 29 November 2021;  doi: 10.21926/rpm.2104047

Abstract

This paper investigates the composition, properties and reactivity of a red mud waste generated in Saudi Arabia with a view to find alternative materials to replace construction binders of high environmental impact. The phase transformation triggered by the sintering of the RM up to 1000°C is determined with thermal and X-Ray Diffraction analyses. Reactivity is investigated with chemic [...]

Open Access Original Research

Assessment of Mineral Gain in White Spot Lesions Using CPP-ACP and CPP-ACFP in Different Clinical Protocols: A Proof of Concept Study

Received: 28 September 2021;  Published: 26 November 2021;  doi: 10.21926/rpm.2104046

Abstract

Subsurface remineralization can be promoted by the topical application of nanoparticles of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP). To assess changes in enamel white spot lesions, an in situ proof-of-concept investigation was performed using 5 subjects (all of whom were healthy young adults) with a cross-over study design. Custom orthodontic brackets were attached to the buccal surfaces of the maxillary second premolar and first molar teeth. Each bracket had a rec [...]

Open Access Research Article

Meat Waste Valorization through Protein Hydrolysis using Different Types of Proteases

Received: 12 May 2021;  Published: 08 November 2021;  doi: 10.21926/rpm.2104045

Abstract

Five different commercial proteases (Alcalase 2.4L, Flavourzyme 1000L, Neutrase, Protamex, and PTN) were evaluated for the simultaneous recovery of protein and lipids through hydrolysis. The hydrolysis reaction was monitored using the pH-stat procedure, in which samples were collected after 240 min of hydrolysis using each enzyme. The samples were analyzed for the degree of hydrolysis, protein hydrolysate, collagen, lipids, and fatty acids. A clear relationship was observed between t [...]

Open Access Short Review

Reverse Mode Polymer Dispersed Liquid Crystal-based Smart Windows: A Progress Report

Received: 17 August 2021;  Published: 01 November 2021;  doi: 10.21926/rpm.2104044

Abstract

The reverse mode polymer dispersed liquid crystal (PDLC) is an emerging smart window technology. Unlike traditional PDLCs, a reverse mode PDLC can be transparent and opaque in the absence and presence of an external electric field. This report provides a brief introduction to several reverse modes PDLC smart window technologies, focusing on polymer-stabilized liquid crystals (PSLCs). The systems based on electrohydrodynamic instability (EHDI) of liquid cr [...]

Open Access Original Research

Quantum Chemistry Estimation of Adhesion Strength of Hydroxyapatite with Titanium Substrate

Received: 12 May 2021;  Published: 27 October 2021;  doi: 10.21926/rpm.2104043

Abstract

One of the ways to improve the fusion of an implant with bone tissue is through the use of biocompatible coatings, in particular, hydroxyapatite (HAp). It is important to assess the strength of the HAp adhesion to the implant. The measure of the strength of the bond of the coating with the substrate is the energy of this bond. Using density functional theory and molecular dynamics, the reaction path, reaction products, oscillation frequency, activation energy and bond energy between [...]

Open Access Research Article

Efficient Debye Function Interpolation Formulae: Sample Applications to Diamond

Received: 17 June 2021;  Published: 22 November 2021;  doi: 10.21926/rpm.2104042

Abstract

The well-known classical heat capacity model developed by Debye proposed an approximate description of the temperature-dependence of heat capacities of solids in terms of a characteristic integral, the T-dependent values of which are parameterized by the Debye temperature, ${\Theta _D}$. However, numerous tests of this simple model have shown t [...]

Open Access Original Research

Durability of Alkali-Activated Materials Made with a High-Calcium, Basic Slag

Received: 09 June 2021;  Published: 13 October 2021;  doi: 10.21926/rpm.2104041

Abstract

Alkali activated (AA) materials have been investigated for decades as an alternative to Portland cement (PC) products. Most consist of a silicate waste activated with alkalis, which leads to lower green-house gas emissions and a substantial drop in the use of unrenewable material resources. This paper studies the durability of AA materials made with a ground granulated blast furnace slag (GGBS) from Dublin, activated with sodium hydroxide (NaOH), and sodium s [...]

Open Access Original Research

Hydration and Microwave Curing Temperature Interactions of Repair Mortars

Received: 24 June 2021;  Published: 09 October 2021;  doi: 10.21926/rpm.2104040

Abstract

Microwave curing of repair patches provides an energy efficient technique for rapid concrete repair. It has serious economic potential due to time and energy saving especially for repairs in cold weather which can cause work stoppages. However, the high temperatures resulting from the combination of microwave exposure and accelerated hydration of cementitious repair materials need to be investigated to prevent potential durability problems in concrete patch repairs. This paper investigates the t [...]
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