scholarly journals Performance Parameter Analysis of Magnesia Based Cement Products – A Review

2021 ◽  
Vol 1197 (1) ◽  
pp. 012078
Author(s):  
J Supriya ◽  
Ashwin Raut
Keyword(s):  
Chloride Ion ◽  
Cementitious Materials ◽  
Parameter Analysis ◽  
Raw Material ◽  
Flexural Behavior ◽  
Ion Diffusion ◽  
Diverse Range ◽  
Degree Of Hydration ◽  
Strength And Durability ◽  
The Impact

Abstract Magnesium oxide (MgO) based cements finds its way active in current researches where diverse range of applications and characteristics such as production process, reactivity and physical properties are essentially focus with the perception of individual expansion objectives. In general, relativity between distinctive MgO characteristics is examined in conjunction with the impact of MgO embodiment on the resources of cementitious materials is further considered. MgO is a key to develop the construction industry thereby mechanical strength and durability performance of cement paste, adhesive and concrete composites impose of MgO needs to be explored. Subsequently, this research paper explicitly defines the investigation of MgO cement composites in terms of compressive and flexural behavior, toughness, tensile and durability performances, flexibility, water susceptibility, porosity, carbonation, chloride ion diffusion, shrinkage and degree of hydration. In this regard, to application of magnesia-based cement products is influenced by various factors such as raw material, composition, performance. The review provides a detailed information of current research available related to magnesia-based cement products based on its properties.

scholarly journals The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials

2017 ◽  
Vol 15 (8) ◽  
pp. 426-439 ◽  
Author(s):  
Akira Hatanaka ◽  
Yogarajah Elakneswaran ◽  
Kiyofumi Kurumisawa ◽  
Toyoharu Nawa
Keyword(s):  
Chloride Ion ◽  
Cementitious Materials ◽  
Ion Diffusion ◽  
The Impact ◽  
Chloride Ion Diffusion

scholarly journals Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 915
Author(s):  
Xiaoqiang Qi ◽  
Sulei Zhang ◽  
Tengteng Wang ◽  
Siyao Guo ◽  
Rui Ren
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Cement Mortar ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Chloride Ion Penetration ◽  
Cement Mortars ◽  
Strength And Durability ◽  
Durability Performance

Graphene’s outstanding properties make it a potential material for reinforced cementitious composites. However, its shortcomings, such as easy agglomeration and poor dispersion, severely restrict its application in cementitious materials. In this paper, a highly dispersible graphene (TiO2-RGO) with better dispersibility compared with graphene oxide (GO) is obtained through improvement of the graphene preparation method. In this study, both GO and TiO2-RGO can improve the pore size distribution of cement mortars. According to the results of the mercury intrusion porosity (MIP) test, the porosity of cement mortar mixed with GO and TiO2-RGO was reduced by 26% and 40%, respectively, relative to ordinary cement mortar specimens. However, the TiO2-RGO cement mortars showed better pore size distribution and porosity than GO cement mortars. Comparative tests on the strength and durability of ordinary cement mortars, GO cement mortars, and TiO2-RGO cement mortars were conducted, and it was found that with the same amount of TiO2-RGO and GO, the TiO2-RGO cement mortars have nearly twice the strength of GO cement mortars. In addition, it has far higher durability, such as impermeability and chloride ion penetration resistance, than GO cement mortars. These results indicate that TiO2-RGO prepared by titanium dioxide (TiO2) intercalation can better improve the strength and durability performance of cement mortars compared to GO.

Testing for the Influence of the Degree of Water Saturation of Concrete upon Chloride Diffusivity

2013 ◽  
Vol 405-408 ◽  
pp. 2639-2643
Author(s):  
Van Tuan Le ◽  
Yong Lai Zheng ◽  
Shu Xin Deng
Keyword(s):  
Diffusion Coefficient ◽  
Water Saturation ◽  
Chloride Ion ◽  
Test Method ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Ion Diffusion ◽  
Chloride Diffusivity ◽  
Water Saturated ◽  
The Impact

In order to estimate the impact of the degree of water saturation of concrete to chloride ion diffusion coefficient, the experimental setup allows to measure chloride diffusion coefficient through nonsaturated concrete specimens with controlled degree of water saturated. The different degrees of water saturation of concrete specimens were obtained, by using saturated solutions of NaCl and KCl controlling the relative humidity, then applied Rapid Cloride Permeability Test method to measure the cloride diffusion coefficient. The test results show that chloride diffusion coefficient depends strongly on the degree of water saturation of concrete. Beside, this relationship shows the non-linear relationship, in which, chloride diffusion coefficient reachs the maximum value in fully saturated concrete specimens.

scholarly journals Magnesia (MgO) Production and Characterization, and Its Influence on the Performance of Cementitious Materials: A Review

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4752
Author(s):  
Nobre José ◽  
Hawreen Ahmed ◽  
Bravo Miguel ◽  
Evangelista Luís ◽  
de Jorge
Keyword(s):  
Mechanical Strength ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Hydration Degree ◽  
Ion Migration ◽  
Cement Pastes ◽  
Calcination Temperatures ◽  
Chloride Ion Penetration ◽  
Strength And Durability

This paper presents a literature review concerning the characteristics of MgO (magnesium oxide or magnesia) and its application in cementitious materials. It starts with the characterization of MgO in terms of production processes, calcination temperatures, reactivity, and physical properties. Relationships between different MgO characteristics are established. Then, the influence of MgO incorporation on the properties of cementitious materials is investigated. The mechanical strength and durability behaviour of cement pastes, mortars and concrete mixes made with MgO are discussed. The studied properties of MgO–cement mixes include compressive strength, flexural strength, tensile strength, modulus of elasticity, water absorption, porosity, carbonation, chloride ion penetration, shrinkage, expansion, and hydration degree. In addition, microscopic analyses of MgO-cement mixes are also assessed. Summarizing the results of different studies, it is concluded that MgO incorporation in cementitious materials generally decreases the mechanical strength and shrinkage, and increases the porosity, expansion, carbonation and chloride ion migration. However, it should be emphasized that the properties of the specific MgO used (mainly the calcination temperature, the reactivity and the surface area) have a significant influence on the characteristics of the cementitious materials produced.

Quantitative Analysis of Chloride Ion Diffusion in Cementitious Materials Using Al27 NMR Spectroscopy

2015 ◽  
Vol 21 (3) ◽  
pp. 04014047 ◽  
Author(s):  
Amirpasha Peyvandi ◽  
Daniel Holmes ◽  
Anagi M. Balachandra ◽  
Parviz Soroushian
Keyword(s):  
Quantitative Analysis ◽  
Nmr Spectroscopy ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Ion Diffusion ◽  
Chloride Ion Diffusion

Cellular Automata-Based Chloride Ion Diffusion Modelling of Concrete Bridge under Multifactor Coupling Action

2011 ◽  
Vol 368-373 ◽  
pp. 1407-1410
Author(s):  
Jin Song Zhu ◽  
Li Kun He
Keyword(s):  
Cellular Automata ◽  
Chloride Ion ◽  
Concrete Bridge ◽  
Ion Diffusion ◽  
Diffusion Parameters ◽  
Stress States ◽  
As Stress ◽  
Multifactor Coupling ◽  
The Impact ◽  
Chloride Ion Diffusion

In order to accurately simulate the diffusion of chloride ion in the existing concrete bridge and acquire the precise concentration of chloride ion at any time, a Cellular Automata(CA)-based model is proposed. Firstly, the process of chloride ion diffusion is analyzed by the CA method and a nonlinear solution to the Fick’s second law is obtained. Secondly, considering the impact of various factors such as stress states, temporal and spatial variability of diffusion parameters and water-cement ratio on the process of chloride ion diffusion, the model of chloride ion diffusion under multifactor coupling is presented. Finally, a chloride ion penetrating experiment is used to prove the effectiveness and reasonability of this present method. A T-type beam is taken as an illustrative example to analyze the process of chloride ion diffusion.

scholarly journals Bentonite replacing part of cement concrete for resistance to chloride ion attack

2019 ◽  
Vol 136 ◽  
pp. 03011
Author(s):  
Jie Luo ◽  
Chuanchang Li ◽  
Yafei Ma ◽  
Lei Wang
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Ion Diffusion ◽  
Natural Pozzolan ◽  
Cement Production ◽  
Chloride Ion Penetration ◽  
Chloride Migration ◽  
Chloride Ion Diffusion

Bentonite is known as a kind of natural pozzolan that can improve the mechanical properties of cementitious materials and reduce the overall CO2 output of cement production. This study is designed to evaluate the feasibility of using bentonite as a substitute for cement in concrete and analyze the effect of bentonite on resisting chloride ion penetration. The concrete was replaced by equal-quality bentonite for 0%, 5%, 10%, 15% and 20% cement respectively, and the water-cement ratio, fine and coarse aggregate content remained constant. The results indicated that as the bentonite content increased, the compressive strength of the mixes increased first and then decreased. The sample containing 10% bentonite got a higher compressive strength than the other samples. The rapid chloride migration (RCM) tests showed that the samples containing bentonite had better resistance to chloride ion attack than samples without bentonite against chloride, especially the sample containing 10% bentonite. It can be concluded that the concrete with 10% bentonite can improve the resistance to chloride ion diffusion with high compressive strength.

scholarly journals A Review on Application of Formaldehyde in Cement-Based Materials

2021 ◽  
Keyword(s):  
Construction Industry ◽  
Construction Material ◽  
Cementitious Materials ◽  
Flow Strength ◽  
Durability Properties ◽  
Cement Based Materials ◽  
Strength And Durability ◽  
The Impact ◽  
Flooring Materials ◽  
Nose And Throat

Abstract. Formaldehyde is environment contamination, which causes irritation in the eyes, nose, and throat with concentration above 1.0ppm. But still, it is used as a construction material as an admixture and furthermore to make paints, adhesives, pressed wood, and flooring materials, etc. This paper reviews the impact of formaldehyde in the cement on flow, strength, and durability properties. In this most of the researchers studied the water reducing nature of formaldehyde-based cementitious materials (FBCM) because of its repulsive property, that can ensure improved workability and provides good mechanical strength. Finally, the challenges in the application of formaldehyde in cement-based materials are discussed to conclude some future scope in the field of the construction industry to use formaldehyde in cement.

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