Influence of Mixture Composition and Type of Cementitious Materials on Enhancing the Fresh Properties and Stability of Self-Consolidating Rubberized Concrete

2016 ◽  
Vol 28 (1) ◽  
pp. 04015075 ◽  
Author(s):  
Mohamed K. Ismail ◽  
Assem A. A. Hassan
Keyword(s):  
Cementitious Materials ◽  
Mixture Composition ◽  
Rubberized Concrete ◽  
Fresh Properties

scholarly journals Ultra-High Early Strength Cementitious Grout Suitable for Additive Manufacturing Applications Fabricated by Using Graphene Oxide and Viscosity Modifying Agents

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2900
Author(s):  
Alyaa Mohammed ◽  
Nihad Tareq Khshain Al-Saadi
Keyword(s):  
Graphene Oxide ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Design Method ◽  
Three Dimensional ◽  
Cementitious Materials ◽  
Fresh Properties ◽  
Manufacturing Applications ◽  
Mechanical Strengths ◽  
The Impact

One of the considerable challenges in the design of cementitious mixtures for additive manufacturing/three-dimensional (3D) printing applications is achieving both suitable fresh properties and significant mechanical strengths. This paper presents the use of graphene oxide (GO) as a promising nano reinforcement material with the potential to improve the printing feasibility and quality of a 3D printed cementitious matrix. Additionally, in this study, a viscosity modifying agent (VMA) was employed as a chemical additive to attain the required consistency and flow. The printed mixture was fabricated using various cementitious materials and waste materials. This study investigated the impact of GO and VMA on the enhancement of the 3D printing of cementitious composites through several tests. A flow test was conducted using the flow table test. The results showed a high fluidity and practical consistency, which are essential for nozzle pumping and accurateness in printed shapes. Furthermore, the bleeding test showed minimal bleeding up to hardening, and a considerable self-cleaning ability was noted during handling when conducting examinations of fresh properties. For hardened properties, the mechanical strengths were exceptionally high, especially at early ages, which is crucial for the stability of sequence layers of printed composites. The tensile strengths were 3.77, 10.5, 13.35, and 18.83 MPa at 1, 3, 7, and 28 days, respectively, and the compressive strengths were 25.1, 68.4, 85.6, and 125.4 MPa at 1, 3, 7, and 28 days, respectively. The test results showed the effectiveness of the fabricated cementitious mixture design method for meeting the requirements for 3D concrete printing applications.

scholarly journals Influence of Concrete Mixture Composition on Acid Resistance of Concrete: A Review

2021 ◽  
Author(s):  
Chinnu Mariam Ninan ◽  
K P Ramaswamy ◽  
R Sajeeb
Keyword(s):  
Acid Resistance ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Concrete Mixture ◽  
Mixture Composition ◽  
Soluble Salts ◽  
Acid Attack ◽  
Related Factors ◽  
Binder Ratio ◽  
Water Binder Ratio

Cementitious materials are highly susceptible to rapid and severe degradation by a wide range of acids that are found immensely in ground water, sewage systems, industrial effluents, acid rain etc. which may cause microstructure deterioration. The factors influencing acid attack is generally categorised as material related factors and test related factors. Material related factors can be either related to acid solution or concrete mixture composition. Composition of concrete mixture greatly impacts the acid resistance of concrete. Factors related to composition of concrete mixture are type of cement, type and proportion of binders, water binder ratio, aggregate binder ratio and mineralogical nature of the aggregates. Even though the type of cement influences acid attack, the magnitude of variation is negligible. Consumption of calcium hydroxide and refinement of pore structure makes the use of supplementary cementitious materials favourable for acid resistance. Decrease in water binder ratio and increase in aggregate binder ratio reduces the porosity of concrete and thereby improves the acid resistance of concrete. Calcareous aggregates are preferred for concretes exposed to acids having less soluble salts and not preferred for acids forming soluble salts. This paper highlights the influence of composition of concrete mixture on acid resistance of concrete. A proper formulation of concrete is expected to enhance its acid resistance.

Fresh Properties of Cementitious Materials Containing Rice Husk Ash for Construction 3D Printing

2020 ◽  
Vol 32 (8) ◽  
pp. 04020195 ◽  
Author(s):  
Shravan Muthukrishnan ◽  
Harn Wei Kua ◽  
Ling Na Yu ◽  
Jacky K. H. Chung
Keyword(s):  
3D Printing ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Cementitious Materials ◽  
Fresh Properties

scholarly journals A Review on the Application of Nanocellulose in Cementitious Materials

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2476
Author(s):  
Aofei Guo ◽  
Zhihui Sun ◽  
Noppadon Sathitsuksanoh ◽  
Hu Feng
Keyword(s):  
Mechanical Properties ◽  
Global Warming ◽  
Energy Consumption ◽  
Environmental Issues ◽  
Cementitious Materials ◽  
Research Progress ◽  
Future Research ◽  
Cellulose Nanofibril ◽  
Fresh Properties ◽  
Matrix Type

The development of the concrete industry is always accompanied by some environmental issues such as global warming and energy consumption. Under this circumstance, the application of nanocellulose in cementitious materials is attracting more and more attention in recent years not only because of its renewability and sustainability but also because of its unique properties. To trace the research progress and provide some guidance for future research, the application of nanocellulose to cementitious materials is reviewed. Specifically, the effects of cellulose nanocrystal (CNC), cellulose nanofibril (CNF), bacterial cellulose (BC), and cellulose filament (CF) on the physical and fresh properties, hydration, mechanical properties, microstructure, rheology, shrinkage, and durability of cementitious materials are summarized. It can be seen that the type, dosage, and dispersion of nanocellulose, and even the cementitious matrix type can lead to different results. Moreover, in this review, some unexplored topics are highlighted and remain to be further studied. Lastly, the major challenge of nanocellulose dispersion, related to the effectiveness of nanocellulose in cementitious materials, is examined in detail.

scholarly journals Utilization of Waste Polysilicon Sludge in Concrete

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 251 ◽  
Author(s):  
Abdul Qudoos ◽  
In Kyu Jeon ◽  
Seong Soo Kim ◽  
Jeong Bae Lee ◽  
Hong Gi Kim
Keyword(s):  
Construction Industry ◽  
Cementitious Materials ◽  
Chloride Penetration ◽  
Supplementary Cementitious Materials ◽  
Fresh Properties ◽  
Environmental Threats ◽  
Environmental Threat ◽  
Granulated Blast Furnace Slag ◽  
Carbon Dioxide Co2 ◽  
Furnace Slag

Increasing use of cement in the construction industry is causing an alarming increase in carbon dioxide (CO2) emissions, which is a serious environmental threat, it can be reduced by the addition of supplementary cementitious materials (SCMs). The commonly used SCMs like ground granulated blast furnace slag (GGBS), metakaolin (MK) and fly ash (FA) have been successfully used to replace the cement partially or completely. Polysilicon sludge obtained from the photovoltaic industry is also a type of waste material that can be used as SCM because it has high content of reactive SiO2. This study investigates the effects of replacing cement with polysilicon sludge in concrete. Different concrete specimens were made by replacing varying proportions of cement with polysilicon sludge and their properties, such as, fresh properties, compressive strength, heat release, chloride penetration, freeze/thaw resistance and microstructural investigations were determined. The results demonstrate that the polysilicon sludge can be used effectively to replace cement, and environmental threats associated with its disposal can be reduced.

Effect of polycarboxylate superplasticisers on the fresh properties of cementitious materials mixed with seawater

2021 ◽  
Vol 289 ◽  
pp. 123143
Author(s):  
Jun Ren ◽  
Xianfeng Wang ◽  
Shengye Xu ◽  
Yunhui Fang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Cementitious Materials ◽  
Fresh Properties

scholarly journals Feasibility Study of SBR-Modified Cementitious Mixtures for Use as 3D Additive Construction Materials

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1321 ◽  
Author(s):  
Kim ◽  
Yeon ◽  
Lee ◽  
Yeon
Keyword(s):  
Three Dimensional ◽  
Construction Materials ◽  
Cementitious Materials ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Test Results ◽  
Fresh Properties ◽  
New Class ◽  
Open Time ◽  
Styrene Butadiene

The primary purpose of this study was to investigate the feasibility of applying polymeric cementitious materials to three-dimensional additive construction (3DAC). Specifically, styrene–butadiene rubber (SBR) latex was employed as an admixture to produce SBR-modified cementitious mixtures, and their fresh properties were experimentally investigated to determine the feasibility of their use in the 3DAC process. The SBR/cement ratio was controlled based on four main materials (i.e., cement, sand, silica fume, and fly ash) in order to determine the optimal fresh properties. The test results revealed that the SBR-modified cementitious mixtures showed excellent flowability, extrudability, buildability, and open time, all of which are required for 3DAC materials. The optimal flow of the SBR-modified cementitious mixtures was 70% ± 1%, which is appropriate for 3DAC applications. According to the experiment results, the SBR-modified cementitious mixtures were sufficiently competitive to serve as a new class of materials for 3D additive construction.

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