Dynamic properties of PVA short fiber reinforced low-calcium fly ash - slag geopolymer under an SHPB impact load

2021 ◽  
Vol 44 ◽  
pp. 103220
Author(s):  
Shu-Hua Xiao ◽  
Sheng-Jin Liao ◽  
Gen-Quan Zhong ◽  
Yong-Chang Guo ◽  
Jia-Xiang Lin ◽  
...  
Keyword(s):  
Fly Ash ◽  
Impact Load ◽  
Dynamic Properties ◽  
Short Fiber ◽  
Fiber Reinforced ◽  
Low Calcium

scholarly journals Experimental Study on Axial Compressive Performance of Polyvinyl Alcohol Fibers Reinforced Fly Ash—Slag Geopolymer Composites

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 142
Author(s):  
Shuhua Xiao ◽  
Yongjian Cai ◽  
Yongchang Guo ◽  
Jiaxiang Lin ◽  
Guotao Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Axial Compression ◽  
Short Fiber ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Low Calcium ◽  
The Matrix ◽  
Compressive Performance ◽  
Axial Compressive Strength

Geopolymer concrete (GC) has been gaining attention in research and engineering circles; however, it is a brittle material with poor tensile performance and crack resistance. To address these problems, we introduced fibers into GC. In this study, axial compression and scanning electron microscope (SEM) tests were carried out on polyvinyl alcohol (PVA) short fiber reinforced low-calcium fly ash-slag-based geopolymer concrete (PFRGC). The ratio of PVA short fibers and low-calcium fly ash on the compression behavior of fiber reinforced geopolymer concrete (FRGC) were investigated and discussed. The test results show that PVA fibers play a bridging role in the cracks of the specimen and bear the load together with the matrix, so the addition of PVA fibers delayed the crack propagation of GC under axial compression. However, with the increase of low-calcium fly ash/PVA fibers, the number of unreacted fly ash particles in PFRGCs increases. Too many unreacted fly ash particles make GC more prone to micro-cracks during loading, adversely affecting compressive properties. Therefore, the axial compressive strength, elastic modulus, and Poisson’s ratio of GC decrease with the increasing low-calcium fly ash/PVA fibers.

scholarly journals Mechanical Properties of Short Fiber-Reinforced Geopolymers Made by Casted and 3D Printing Methods: A Comparative Study

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 579 ◽  
Author(s):  
Kinga Korniejenko ◽  
Michał Łach ◽  
Shih-Yu Chou ◽  
Wei-Ting Lin ◽  
An Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
3D Printing ◽  
Casting Process ◽  
Short Fiber ◽  
Fiber Reinforced ◽  
Geopolymer Matrix ◽  
Layer Manufacturing ◽  
Injection Methods ◽  
Class F Fly Ash

The main objective of this article is to develop ceramic-based materials for additive layer manufacturing (3D printing technology) that are suitable for civil engineering applications. This article is focused on fly ash-based fiber-reinforced geopolymer composites. It is based on experimental research, especially research comparing mechanical properties, such as compressive and flexural strength for designed compositions. The comparison includes various composites (short fiber-reinforced geopolymers and plain samples), different times of curing (investigation after 7 and 28 days), and two technologies of manufacturing (casted and injected samples—simulations of the 3D printing process). The geopolymer matrix is based on class F fly ash. The reinforcements were green tow flax and carbon fibers. The achieved results show that the mechanical properties of the new composites made by injection methods (simulations of 3D technology) are comparable with those of the traditional casting process. This article also discusses the influence of fiber on the mechanical properties of the composites. It shows that the addition of short fibers could have a similar influence on both of the technologies.

Mechanical Response of Short Fiber Reinforced Fly Ash Based Geopolymer Composites

2018 ◽  
Vol 12 (6) ◽  
pp. 485
Author(s):  
Antonio Formisano ◽  
Barbara Galzerano ◽  
Massimo Durante ◽  
Ottavio Marino ◽  
Barbara Liguori
Keyword(s):  
Fly Ash ◽  
Mechanical Response ◽  
Short Fiber ◽  
Fiber Reinforced ◽  
Geopolymer Composites

scholarly journals Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 875
Author(s):  
Chenchen Luan ◽  
Qingyuan Wang ◽  
Fuhua Yang ◽  
Kuanyu Zhang ◽  
Nodir Utashev ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Bond Strength ◽  
Prediction Models ◽  
Splitting Tensile Strength ◽  
Geopolymer Concrete ◽  
Structural Factors ◽  
Test Results ◽  
Portland Cement Concrete ◽  
Low Calcium

There have been a few attempts to develop prediction models of splitting tensile strength and reinforcement-concrete bond strength of FAGC (low-calcium fly ash geopolymer concrete), however, no model can be used as a design equation. Therefore, this paper aimed to provide practical prediction models. Using 115 test results for splitting tensile strength and 147 test results for bond strength from experiments and previous literature, considering the effect of size and shape on strength and structural factors on bond strength, this paper developed and verified updated prediction models and the 90% prediction intervals by regression analysis. The models can be used as design equations and applied for estimating the cracking behaviors and calculating the design anchorage length of reinforced FAGC beams. The strength models of PCC (Portland cement concrete) overestimate the splitting tensile strength and reinforcement-concrete bond strength of FAGC, so PCC’s models are not recommended as the design equations.

scholarly journals Effect of Short Fiber Reinforcements on Fracture Performance of Cement-Based Materials: A Systematic Review Approach

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1745
Author(s):  
Waqas Ahmad ◽  
Mehran Khan ◽  
Piotr Smarzewski
Keyword(s):  
Graphical Representation ◽  
Safety Evaluation ◽  
Short Fiber ◽  
Research Trend ◽  
Scientometric Analysis ◽  
Fiber Reinforced ◽  
Factors Affecting ◽  
Fracture Properties ◽  
Cement Based Materials ◽  
Relevant Publication

Fracture characteristics were used to effectively evaluate the performance of fiber-reinforced cementitious composites. The fracture parameters provided the basis for crack stability analysis, service performance, safety evaluation, and protection. Much research has been carried out in the proposed study field over the previous two decades. Therefore, it was required to analyze the research trend from the available bibliometric data. In this study, the scientometric analysis and science mapping techniques were performed along with a comprehensive discussion to identify the relevant publication field, highly used keywords, most active authors, most cited articles, and regions with largest impact on the field of fracture properties of cement-based materials (CBMs). Furthermore, the characteristic of various fibers such as steel, polymeric, inorganic, and carbon fibers are discussed, and the factors affecting the fracture properties of fiber-reinforced CBMs (FRCBMs) are reviewed. In addition, future gaps are identified. The graphical representation based on the scientometric review could be helpful for research scholars from different countries in developing research cooperation, creating joint ventures, and exchanging innovative technologies and ideas.

Development of low-calcium fly ash-based geopolymer mortar using nanosilica and hybrid fibers

2021 ◽  
Author(s):  
Keyu Chen ◽  
Dazhi Wu ◽  
HaiXiang Chen ◽  
Guoqing Zhang ◽  
Ruolan Yao ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hybrid Fibers ◽  
Low Calcium
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