scholarly journals Preparation and Freeze-Thaw Resistance of Geopolymer-Based Natural Plant Fiber Composites

2021 ◽  
Author(s):  
Jianli Tan ◽  
Yuantian Huang ◽  
Leping Liu ◽  
Shujuan Yu ◽  
Guangjian Zheng
Keyword(s):  
Water Glass ◽  
Bending Strength ◽  
Orthogonal Experiment ◽  
Fiber Composites ◽  
Fiber Content ◽  
Plant Fiber ◽  
Natural Plant ◽  
Freeze Thaw ◽  
Binder Ratio ◽  
Water Binder Ratio

Slag, alkaline activator solution and straw fibers were used to manufacture geopolymer-based natural plant fiber composites. In this study, three influences of water glass modulus, fiber content and water-binder ratio on bending strength were studied by orthogonal experiment and single factor analysis. The results indicate that the order of the factors affecting the bending strength is: water-binder ratio > fiber content > water glass modulus. When the water-binder ratio is 0.4, the fiber content is 12%, and the water glass modulus is 1.9, the bending strength of composite is up to 9.1MPa, which exceeds the standard requirements (9MPa) for qualified products specified in the standard (GB/T 24312-2009). The SEM and appearance of specimens indicate that the geopolymer-based natural plant fiber composites have good freeze-thaw resistance.

Preparation and Performances of Geopolymer-Based Plant Fiber Composites

2018 ◽  
Vol 281 ◽  
pp. 266-271 ◽  
Author(s):  
Shi Ju Wei ◽  
Jian Li Tan ◽  
Wan Li Lu ◽  
Le Ping Liu ◽  
Shu Juan Yu ◽  
...  
Keyword(s):  
Water Glass ◽  
Bending Strength ◽  
Influence Factors ◽  
Fiber Composites ◽  
Fiber Content ◽  
National Standard ◽  
Liquid Ratio ◽  
Plant Fiber ◽  
Plant Fibers ◽  
Influence Of Water

Geopolymer-based plant fiber composites were fabricated with metakaolin, alkaline sodium silicate and plant fibers. In this paper, orthogonal test and single factor analysis were used to study the influence of water glass modulus, solid liquid ratio and fiber content on bending strength. The results show that sequence of influence factors for bending strength was: solid to liquid ratio > fiber content > water glass modulus. When the water glass modulus is 1.7, the fiber content is 8% and the solid to liquid ratio is 1:1.4, the bending strength is up to 10.44MPa, which exceeds the Standard requirements (9MPa) specified by the China National Standard (GB/T 24312-2009). The micro-morphology of SEM indicates that the mix of plant fiber can enhance the toughness of geopolymer.

scholarly journals Optimization of Preparation of Foamed Concrete Based on Orthogonal Experiment and Range Analysis

2021 ◽  
Vol 8 ◽  
Author(s):  
Menglong Cong ◽  
Shanshan Zhang ◽  
Dandan Sun ◽  
Kunpeng Zhou
Keyword(s):  
Thermal Conductivity ◽  
Water Glass ◽  
Orthogonal Experiment ◽  
Glass Content ◽  
Range Analysis ◽  
Geopolymer Matrix ◽  
Binder Ratio ◽  
Concrete Blocks ◽  
Foamed Concrete ◽  
Water Binder Ratio

For the purpose of reducing the energy consumption and construction cost of buildings, the preparation process of geopolymer based foamed concrete, which is a novel material of the wall and roof of building, had been studied in detail. Water glass and sodium hydroxide were used as the alkali activator to excite the mixture consists of slag, fly ash and Kaolin to form the geopolymer matrix, and finally the foams generated using the physical foaming method were filled into the geopolymer matrix to produce geopolymer-based foamed concrete blocks. In the preparation process, firstly one of the four parameters of foam content, water-binder ratio, water glass content, and water glass modulus had been changed separately to study the influence of a single factor on the compressive strength, dry density, thermal conductivity and specific strength of foamed concrete blocks. The experimental results show that the above four factors have different degrees of influence on the concerned performances. Next, some representative combinations of these factors were constructed by orthogonal experiment method, and the influence degree of each combination on the concerned performances was determined by means of range analysis. According to the results of analysis, the most important influencing factor in terms of thermal conductivity was the water-binder ratio, followed by foam content, water glass modulus and water glass content. When the foam content is 1.58%, the water-binder ratio is 0.45, the water glass content is 30%, and the water glass modulus is 1.2, the thermal conductivity of the prepared geopolymer foam concrete reaches 0.044 W/(m·K), which satisfies the expected requirements for heating in severe cold areas.

scholarly journals Natural Plant Fiber Composites-Constituent Properties and Challenges in Numerical Modeling and Simulations

2017 ◽  
Vol 09 (04) ◽  
pp. 1750045 ◽  
Author(s):  
Yucheng Zhong ◽  
Umeyr Kureemun ◽  
Le Quan Ngoc Tran ◽  
Heow Pueh Lee
Keyword(s):  
Carbon Fibers ◽  
Renewable Resources ◽  
Natural Fibers ◽  
Fiber Composites ◽  
Future Research ◽  
Plant Fiber ◽  
Plant Fibers ◽  
Natural Plant ◽  
Synthetic Fibers ◽  
Review Reports

Natural fibers are extracted from natural resources such as stems of plants. In contrast to synthetic fibers (e.g., carbon fibers), natural fibers are from renewable resources and are eco-friendlier. Plant fibers are important members of natural fibers. Review papers discussing the microstructures, performances and applications of natural plant fiber composites are available in the literature. However, there are relatively fewer review reports focusing on the modeling of the mechanical properties of plant fiber composites. The microstructures and mechanical behavior of plant fiber composites are briefly introduced by highlighting their characteristics that need to be considered prior to modeling. Numerical works that have already been carried out are discussed and summarized. Unlike synthetic fibers, natural plant fiber composites have not received sufficient attention in terms of numerical simulations. Existing technical challenges in this subject are summarized to provide potential opportunities for future research.

scholarly journals Strength, Permeability, and Freeze-Thaw Durability of Pervious Concrete with Different Aggregate Sizes, Porosities, and Water-Binder Ratios

2018 ◽  
Vol 8 (8) ◽  
pp. 1217 ◽  
Author(s):  
Hanbing Liu ◽  
Guobao Luo ◽  
Haibin Wei ◽  
Han Yu
Keyword(s):  
Compressive Strength ◽  
Mechanical Strength ◽  
Aggregate Size ◽  
Pervious Concrete ◽  
High Porosity ◽  
Range Analysis ◽  
Freeze Thaw ◽  
Binder Ratio ◽  
The Impact ◽  
Water Binder Ratio

Pervious concrete (PC), as an environmental friendly material, can be very important in solving urban problems and mitigating the impact of climate change; i.e., flooding, urban heat island phenomena, and groundwater decline. The objective of this research is to evaluate the strength, permeability, and freeze-thaw durability of PC with different aggregate sizes, porosities, and water-binder ratios. The orthogonal experiment method is employed in the study and nine experiments are conducted. The compressive strength, flexural strength, permeability coefficient, porosity, density, and freeze-thaw durability of PC mixtures are tested. Range analysis and variance analysis are carried out to analyze the collected data and estimate the influence of aggregate size, porosity, and water-binder ratio on PC properties. The results indicate that porosity is the most important factor determining the properties of PC. High porosity results in better permeability, but negatively affects the mechanical strength and freeze-thaw durability. PC of 15% porosity can obtain high compressive strength in excess of 20 MPa and favorable freeze-thaw durability of 80 cycles without sacrificing excessive permeability. Aggregate size also has a significant effect on freeze-thaw durability and mechanical strength. Small aggregate size is advantageous for PC properties. PC with 4.75–9.5 mm coarse aggregate presents excellent freeze-thaw durability. The influence of the water-binder ratio on PC properties is not as significant as that of aggregate size and porosity. An optimal mix ratio is required to trade-off between permeability, mechanical strength, and freeze-thaw durability.

Study on the Workability of High Performance Concrete Mixture with Compound Mineral Admixtures

2013 ◽  
Vol 671-674 ◽  
pp. 1839-1843
Author(s):  
Yuan Gang Wang ◽  
Chao Wan ◽  
Kai Jian Huang ◽  
Gao Qin Zhang ◽  
Ya Feng Hu
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Orthogonal Experiment ◽  
Steel Slag ◽  
Mineral Admixtures ◽  
Impact Factors ◽  
Slag Powder ◽  
Granulated Blast Furnace Slag ◽  
Binder Ratio ◽  
Water Binder Ratio

Several compound mineral admixtures, such as steel slag powder, granulated blast furnace slag powder and silica fume, are mixed with proper proportion to improve the workability of High Performance Concrete（HPC）. Through the orthogonal experiment, workability of HPC is analyzed on water-binder ratio, sand ratio, the amount of superplasticizer and the amount of compound mineral admixtures. Results show that: workability of HPC was significantly effected by the amount of naphthalene sulphonate water-reducing admixture and water-binder ratio, the amount of compound mineral admixtures and sand ratio are impact factors on the workability in a certain extent.

scholarly journals Mechanical Properties and Fracture Behavior of Crumb Rubber Basalt Fiber Concrete Based on Acoustic Emission Technology

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3513 ◽  
Author(s):  
Hanbing Liu ◽  
Wenjun Li ◽  
Guobao Luo ◽  
Shiqi Liu ◽  
Xiang Lyu
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Fracture Behavior ◽  
Basalt Fiber ◽  
Crumb Rubber ◽  
Fiber Content ◽  
Replacement Rate ◽  
Fiber Concrete ◽  
Binder Ratio ◽  
Water Binder Ratio

Basalt fiber and crumb rubber, as excellent road material modifiers, have great advantages in improving the mechanical properties and fracture behavior of concrete. Acoustic emission (AE) is a nondestructive testing and real-time monitoring technique used to characterize the fracture behavior of concrete specimens. The object of this paper is to investigate the effects of crumb rubber replacement rate, basalt fiber content and water–binder ratio on the mechanical properties and fracture behavior of crumb rubber basalt fiber concrete (CRBFC) based on orthogonal test. The fracture behavior of a CRBFC specimen under three-point flexural conditions was monitored by AE technology and the relative cumulative hit (RCH) was defined to characterize the internal damage degree of CRBFC. The experimental results showed that, considering the mechanical strength and fracture damage behavior of CRBFC, the optimal crumb rubber replacement rate, basalt fiber content and water–binder ratio are 10%, 2 kg/m3 and 0.46, respectively. In addition, it was found that AE parameters can effectively characterize the fracture behavior of CRBFC. The fracture stages of CRBFC can be divided according to the cumulative AE hits and counts. AE amplitude value can be used as an early warning of CRBFC specimen fracture. Moreover, the fracture mode can be identified by RA and average frequency (AF) values variation during the loading process.

Influence of Curing Age and Water-Binder Ratio on Chloride Permeability under Freeze-Thaw and Load

2013 ◽  
Vol 405-408 ◽  
pp. 2610-2615
Author(s):  
Lei Hong ◽  
Run Min Duo
Keyword(s):  
Diffusion Coefficients ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Diffusion ◽  
Chloride Permeability ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Binder Ratio ◽  
Water Binder Ratio ◽  
Curing Age

The chloride diffusion coefficients of different water-binder ratio high performance concrete (HPC) subjected to different one-way loads，freeze-thaw cycles and different standard curing ages were measured by electro-migration (RCM) tests and the results were analyzed. The test results indicate that with the increase of one-way load, its influence on the chloride permeability of different water-binder ratio HPC rises in the same proportion. The influence of the curing age on the chloride permeability of HPC will decrease with the reduction of the water-binder ratio of HPC. Under the same freeze-thaw cycle conditions, the relationships between chloride diffusion coefficients of different water-binder ratio HPC and curing ages are nearly suitable to power function.

scholarly journals Design Optimization of Rubber-Basalt Fiber- Modified Concrete Mix Ratios Based on a Response Surface Method

2020 ◽  
Vol 10 (19) ◽  
pp. 6753
Author(s):  
Yafeng Gong ◽  
Jiaxiang Song ◽  
Siyuan Lin ◽  
Jianxing Yang ◽  
Yang He ◽  
...  
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Basalt Fiber ◽  
Fiber Content ◽  
Quadratic Term ◽  
Rubber Content ◽  
Surface Method ◽  
Rsm Optimization ◽  
Binder Ratio ◽  
Water Binder Ratio

Rubber aggregates produced from waste rubber materials and environmentally friendly basalt fibers are excellent concrete modification materials, which significantly improve the working performance and mechanical properties of concrete. This paper studied the influences of water-binder ratio, basalt fiber content and rubber content on the properties of rubber-basalt fiber modified concrete (RBFC). Based on the response surface method (RSM), optimization schemes of three preparation parameters were designed. The results showed that all preparation parameters have significant impacts on the slump. The rubber content has a closer relationship with the compressive strength and the quadratic term of the basalt fiber content has a significant impact on the flexural strength. According to the analysis, the optimal mix ratio which possesses reliable accuracy compared with experimental results includes a water-binder ratio of 0.39, a basalt fiber content of 4.56 kg/m3 and a rubber content of 10%,

Orthogonal Test Research on Compressive Strength Size Effect of ECC

2012 ◽  
Vol 538-541 ◽  
pp. 1789-1795
Author(s):  
Ming Ke Deng ◽  
Yun Tao Chang ◽  
Xing Wen Liang
Keyword(s):  
Compressive Strength ◽  
Size Effect ◽  
Failure Process ◽  
Orthogonal Test ◽  
Fiber Content ◽  
Content Increase ◽  
Test Study ◽  
Coefficient Increase ◽  
Binder Ratio ◽  
Water Binder Ratio

Engineered fiber reinforced cementitious composite (ECC) can significantly improve the seismic performance and durability of concrete structures, which has pseudo strain hardening and multiple cracking performances. Through 32 groups of 192 specimens for compressive strength of ECC, the orthogonal test study on the cube compression failure process, and further research on water binder ratio, fiber content by volume, fly ash content and sand binder ratio of 4 kinds of factors on the size effect of ECC cube compressive strength. The test result shows that: PVA fiber content increases, ECC compressive toughness is improved obviously; water binder ratio and fiber content are the main factors which affect the ECC compressive strength and size effect. When water binder ratio decrease, the compressive strength of ECC materials improve and size effect coefficient increase. Fiber content increase, the compressive strength of test block increase and the size effect coefficient increase. Through the bending tests, we know that: the fiber content by volume increases, the ECC flexural strength of the composite increases gradually.

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