Showing papers in "Journal of Sustainable Cement-Based Materials in 2019"
TL;DR: In this article, the most commercialized construction material, concrete, plays an indispensable role in the performance of many industrial, commercial, military, and residential structures and hence, the evoluti...
Abstract: Concrete being the most-commercialized construction material, plays an indispensable role in the performance of many industrial, commercial, military, and residential structures. Hence, the evoluti...
59 citations
TL;DR: Alkali-activated materials are a low-CO2 alternative for Portland cement in construction as mentioned in this paper, however, one major issue in their use is the poor or varying functionality of the currently available materials.
Abstract: Alkali-activated materials are a low-CO2 alternative for Portland cement in construction. However, one major issue in their use is the poor or varying functionality of the currently available comme...
49 citations
TL;DR: Wang et al. as mentioned in this paper reviewed the current research on nanotechnology application in RAC, including nanoengineering and nanoscience, and found that nanoengineering has helped RAC achieve dense microstructure, improved mechanical properties and durability.
Abstract: As a very promising sustainable construction material, recycled aggregate concrete (RAC) has become a hot research topic and attracted wide attention. Although many investigations have been conducted, it is still a great challenge to product RAC with satisfactory and stable performance for practical engineering application. In recent years, nanotechnology has been introduced to RAC research and displayed distinct advantages over many traditional methods. This article is devoted to reviewing the current research on nanotechnology application in RAC, including nanoengineering and nanoscience. The corresponding results involving microstructure characteristics, mechanical properties, workability, and durability were summarized and discussed. It has been found that nanoscience has promoted better understanding of microstructure and various internal mechanism of RAC, while nanoengineering has helped RAC achieve dense microstructure, improved mechanical properties and durability. However, further efforts are req...
45 citations
TL;DR: In this article, non-biodegradable aggregate prepared from low density polyethylene (LDPE) plastic was used as partial replacement for sand in cement mortar, and various volumetric fractions of 0, 5, 10, 20, 30, 40, 50, 60, 80, 90, 120, 120 were used.
Abstract: Non-biodegradable aggregate prepared from low density polyethylene (LDPE) plastic was used as partial replacement for sand in cement mortar. Various volumetric fractions of 0, 5, 10, 20, 30, 40, 50...
39 citations
TL;DR: In this article, the compressive strength of fly ash was investigated in an alkali-activated low-calcium fly ash system, where the ratio of the total reactive silica to sodium ratio in the activated system was equal to 4.72 and lower.
Abstract: The compressive strength achieved in alkali-activated low-calcium fly ash depends on the total reactive oxide ratios in the activated system, the reactive alumina content in fly ash and the initial molarity of NaOH. The total reactive silica in the system is the reactive silica contributed by the fly ash and soluble silica from the alkaline solution. A minimum molarity of NaOH is required to ensure complete dissolution of the glassy phase present in fly ash. The maximum compressive strength depends on the amorphous reaction product content formed, which is determined by the reactive alumina content in the fly ash. The highest compressive strength is achieved for the ratio of the total reactive silica to sodium ratio in the activated system equal to 4.72 and lower. More Na is incorporated in the reaction product on increasing the Na2O content relative to the reactive oxides.
29 citations
TL;DR: In this article, a growing need in the construction industry to improve transfer and durability aspects of Portland pozzolana cement was identified, and Ureolytic bacteria have recently emerged as potential micro-organisms w...
Abstract: There is a growing need in the construction industry to improve transfer and durability aspects of Portland pozzolana cement. Ureolytic bacteria have recently emerged as potential micro-organisms w...
26 citations
TL;DR: In this article, the authors evaluated 2-year durability performance of geopolymer cement (GC) mortar derived from a blend of low calcium fly ash and calcium aluminate cement in hydrochloric and sulfuric acid.
Abstract: The present work evaluates 2-year durability performance of geopolymer cement (GC) mortar derived from a blend of low calcium fly ash and calcium aluminate cement in hydrochloric and sulfuric acid ...
25 citations
TL;DR: In this article, the effect of seawater as mixing water of fly ash mortars on compressive strength and chloride binding ability of the fly ash matrix was investigated. And the results showed an increase in compressive and chloride bounding ability.
Abstract: This paper presents the effect of seawater as mixing water of fly ash mortars on compressive strength and chloride binding ability of fly ash matrix. Results show increase in compressive strength a...
25 citations
TL;DR: In this article, a fly ash geopolymer was used as a fire resistant coating of wood for fire resistant construction of a bridge made from carbon fiber (CF) and fly ash.
Abstract: This paper presents an innovative application of fly ash geopolymer as fire resistant coating of timber. Sodium (Na) and potassium (K) activated fly ash geopolymer coatings with carbon fiber (CF) a...
22 citations
TL;DR: In this paper, the feasibility of using waste ceramic powder as a partial replacement of cement and/or sand in cement pastes and mortars was evaluated using a preliminary feasibility study.
Abstract: This article presents the results of a preliminary study assessing the feasibility of using waste ceramic powder as a partial replacement of cement and/or sand in cement pastes and mortars. Two dif...
20 citations
TL;DR: In this paper, an environmentally sustainable material as wheat straw deriving from Apulia region, Southern Italy, was added to cement mortars and characterized by thermal, acoustic, and mechanical properties.
Abstract: In the present research, an environmentally sustainable material as wheat straw deriving from Apulia region, Southern Italy, was added to cement mortars and characterized by thermal, acoustic, mech...
TL;DR: A theoretical prediction of calcium and aluminate ion concentrations of calcium aluminate cement (CAC) system on dissolution and nucleation behavior, induction time (tind), inte....
Abstract: This study presents a theoretical prediction of calcium and aluminate ion concentrations of calcium aluminate cement (CAC) system on dissolution and nucleation behavior, induction time (tind), inte...
TL;DR: In this paper, the development of innovative and multifunctional mortars with low environmental impact for indoor applications acting as passive systems to moderate extremes of humidity and extreme extremes of temperature.
Abstract: The article focuses on the development of innovative and multifunctional mortars with low environmental impact for indoor applications acting as passive systems to moderate extremes of humidity and...
TL;DR: In this article, the effect of metakaolin (MK) and slag as supplementary cementitious materials in concrete was investigated, and the measurements of compressive strength, rapid c...
Abstract: In this article, the effect of metakaolin (MK) and slag as supplementary cementitious materials in the concrete was investigated. For this purpose, the measurements of compressive strength, rapid c...
TL;DR: In this paper, the effects of restrained drying shrinkage on early-age cracking on concrete bridge decks is investigated. But the authors focus on the early age of bridge deck cracking and not the early deterioration of bridges.
Abstract: Early-age cracking on concrete bridge decks is a major concern because it leads to premature deterioration of bridges. This study experimentally investigates the effects of restrained drying shrink...
TL;DR: In this paper, the dry-wet-cycled sulfate resistance and hydration products of steam-cured and standardcured steel-slag mortars were investigated.
Abstract: In this investigation, the dry–wet-cycled sulfate resistance and hydration products of steam-cured and standard-cured steel-slag mortars were investigated. Strength loss, porosity change, and micro...
TL;DR: In this paper, the nano to micro scale morphology of calcium silicate hydrate (C-S-H) in cement paste with water/cement ratio similar to high performance concrete was characterized by field emission transmission.
Abstract: The nano to micro scale morphology of calcium silicate hydrate (C-S-H) in cement paste with water/cement ratio similar to high performance concrete was characterized by field emission transmission ...
TL;DR: In this paper, the use of pozzolans, metakaolin, and silica fume (SF) from local mine waste to improve acid resistance of rehabilitation shotc...
Abstract: This study aims to investigate the use of pozzolans–fly ash (FA), metakaolin (MK), and silica fume (SF)—which can be sourced from local mine waste to improve acid resistance of rehabilitation shotc...
TL;DR: In this paper, different standards to evaluate the resistance of concretes to the external sulfate atta- ture are proposed to evaluate concrete resistance to external sulfates.
Abstract: Usually the regulation defines the concentration of sulfates to consider aggressive soil or water. There are different standards to evaluate the resistance of concretes to the external sulfate atta...
TL;DR: In this article, the deterioration of concrete structures caused by external sulfate attack was found in many residential concrete foundations in Japan, and they constructed concrete foundations constructed on sulfate-bearin...
Abstract: Deterioration of concrete structures caused by external sulfate attack was found in many residential concrete foundations in Japan. In residential concrete foundations constructed on sulfate-bearin...
TL;DR: In this article, the electromagnetic radiation (EMR) response of Portland Pozzolana cement paste samples and samples with addition of fly ash under impact was presented. A peak EMR voltage ranging from 66 to...
Abstract: This paper presents the electromagnetic radiation (EMR) response of Portland Pozzolana cement paste samples and samples with addition of fly ash under impact. A peak EMR voltage ranging from 66 to ...