Chemical Durability Investigation of Magnesium Phosphosilicate Cement

2006 ◽  
Vol 302-303 ◽  
pp. 275-281 ◽  
Author(s):  
Zhu Ding ◽  
Zong Jin Li ◽  
Feng Xing
Keyword(s):  
Portland Cement ◽  
High Performance ◽  
Sea Water ◽  
High Strength ◽  
Chemical Durability ◽  
Test Results ◽  
Chemical Corrosion ◽  
The Sustainable Development ◽  
Parallel Tests ◽  
Chemical Corrosion Resistance

The magnesium phosphosilicate cement (MPSC) is a novel inorganic binder, it sets quickly and has very high strength. Also, it is a promising material for the sustainable development. In the present study, the durability of MPSC were investigated, including deicer scaling resistance under freezing-thawing cycles, chemical corrosion resistance in sodium sulfate and magnesium sulfate solutions, and wet-dry resistance in fresh and natural sea water. For comparison, Portland cement samples were also prepared for parallel tests. Test results showed that the chemical durability of MPSC is superior that of Portland cement. The causes of the high performance may be attributed to the low water demand and a reasonable microstructure of hardened paste matrix.

scholarly journals Study on the influence of test solution concentration on the chemical corrosion resistance of ceramic tiles

2020 ◽  
Vol 185 ◽  
pp. 04042
Author(s):  
Tao Tian ◽  
Shanyu Liu ◽  
Rong Wang ◽  
Ying Lei ◽  
Changlin Zheng
Keyword(s):  
Chemical Resistance ◽  
Solution Concentration ◽  
Test Solution ◽  
Test Results ◽  
Ceramic Tiles ◽  
Acid Base ◽  
Chemical Corrosion ◽  
Base Solution ◽  
Improvement Measures ◽  
Chemical Corrosion Resistance

Chemical resistance is one of the important evaluation factors of ceramic tiles. This article describes the method for determining the chemical resistance of ceramic tiles, and discusses the influence of acid-base solution concentration on the test results during the experiment, and proposes corresponding improvement measures.

Study on the Compressive Strength and Mixing of Ultra-High Performance Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 825-828
Author(s):  
Su Li Feng ◽  
Peng Zhao
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Strength Properties ◽  
Test Method ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Ultra High Performance Concrete ◽  
Mixture Ratio

The test in order to obtain liquidity, higher intensity ultra-high performance concrete(UHPC), in the course of preparation, high intensity quartz sand to replace the ordinary sand,reasonable mixture ratio control low water-cement ratio,the incorporation of part of the test piece ofsteel fibers, produced eight specimens . In the ordinary molding and the standard conservation 28d thecase, the ultra-high-performance concrete compressive strength of more than 170MPa.Thepreparation of the test method and test results will provide the basis for further study of the law of themechanical properties of ultra high strength properties of concrete.

scholarly journals Natural Silkworm Cocoon Composites with High Strength and Stiffness Constructed in Confined Cocooning Space

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1214 ◽  
Author(s):  
Lan Cheng ◽  
Xiaoling Tong ◽  
Zhi Li ◽  
Zulan Liu ◽  
Huiming Huang ◽  
...  
Keyword(s):  
High Performance ◽  
High Strength ◽  
Homogeneous Layer ◽  
Dense Layer ◽  
Test Results ◽  
Young’S Moduli ◽  
Layer Structures ◽  
Potential Applications ◽  
Silkworm Cocoon ◽  
Strength And Stiffness

In this study, using round paper tubes (PTs) and rectangular cardboard boxes (CBs) as external constraints to control the size of the cocooning space, we fabricated a series of modified silkworm cocoons (PT cocoons and CB cocoons). Their microstructures, morphologies, compositions, and mechanical properties were characterized and compared with normal silkworm cocoons. These two kinds of modified silkworm cocoons exhibit dense and homogeneous layer structures. Tensile test results indicate that above a size limit of cocooning space, their tensile strengths, Young’s moduli, and strain energy densities increase with the decrease in cocooning space. Especially in comparison with the normal cocoons, the tensile strength and Young’s modulus of the PT-14 cocoon increase by 44% and 100%, respectively. Meanwhile, PT cocoons and CB cocoons, except PT-12, also possess better peeling resistance than normal cocoons. Owing to the dense structure and low porosity, the modified cocoons form robust fiber networks that result in high strength and toughness. This study provides a green and efficient method to fabricate mechanically enhanced silkworm cocoons with special shapes and dense layer structures. The method can be easily subjected to further modification processes and has potential applications in the production of high-performance green cocoon composites and biomimetic materials.

Confined capping system for compressive strength testing of high performance concrete cylinders

1995 ◽  
Vol 22 (3) ◽  
pp. 617-620 ◽  
Author(s):  
Claude D. Johnson ◽  
S. Ali Mirza
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Concrete Specimen ◽  
Strength Testing ◽  
Test Results ◽  
Testing Procedures ◽  
Testing Method ◽  
Concrete Cylinders

This paper presents a simple, inexpensive confined cap testing method which can be employed in the compressive strength testing of high performance concrete cylinders. An inexpensive customized cylinder capping apparatus and standard concrete laboratory testing equipment are employed. The paper describes the capping apparatus, capping and testing procedures, as well as test results for concrete compressive strengths up to and exceeding 100 MPa. Key words: capping, capping confinement, compressive strength, cylinders, end condition, grinding, high-strength concrete, specimen size, testing.

The Development and Application of High-Performance Ultra-High Strength Stainless Steel Subject to Marine Environment

2014 ◽  
Vol 783-786 ◽  
pp. 867-874 ◽  
Author(s):  
Zhen Bao Liu ◽  
Jian Xiong Liang ◽  
Xiu Li Zhang ◽  
Zhi Yong Yang ◽  
Guo Qiang Sun
Keyword(s):  
Stainless Steel ◽  
High Performance ◽  
Sea Water ◽  
Water Immersion ◽  
High Strength ◽  
Fatigue Properties ◽  
High Tech ◽  
Phase Identification ◽  
Surface Protection ◽  
High Temperature Mechanical Properties

An alloy chemical composition of a new ultra-high strength stainless has been successfully designed through strengthening mechanisms of carbide and intermetallic compounds. The forging round bar with diameter of 200 mm has been manufactured by means of ultra-high purity smelting and the whole process technologies of micro-unit refinement and phase change control. It was revealed that the developed steel assumes tensile strength of 1960MPa, elongation of 13.5%, fracture toughness KICgreater than 90MPa·m1/2, and KISCCgreater 60MPa·m1/2. Based on the microstructural observation and phase identification, it was found that the M2C and the Laves phase were precipitated in the martensitic laths and a small amount of austenite phase was retained in between the Martensitic lath interfaces, which were related to the improved strength and toughness of the developed steel. Furthermore, it was indicated that the steel also presents high fatigue properties and good high-temperature mechanical properties. The corrosion resistance of the steel is equivalent to that of 15-5PH stainless steel but much better than that of the Aermet100 steel under the condition of the marine atmosphere and sea water immersion. This developed steel can be applied in marine corrosive environment without the surface protection and thus can save the expensive maintenance costs and avoid environmental pollution. Based on the promising properties, it was concluded that the developed steel has wide application prospects in the fields of aviation, aerospace, ships, advanced machinery, and advanced machinery manufacturing and other high-tech.

Influence of Metakaolin on Mechanical Properties of High-Performance Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 1904-1909
Author(s):  
Bao Min Wang ◽  
Wei Liu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Equal Mass ◽  
Test Results ◽  
Optimum Temperature ◽  
Compressive Strength Of Concrete ◽  
And Performance

Kaolin is a material with broad sources and a low price. Metakaolin is made from kaolin which is calcined, finely ground at an optimum temperature of 750 being kept constant for 4 hours. High strength and performance concrete can be mixed from metakaolin as a substitute for equal mass cement. The influences of 5%, 10% and 15% metakaolin in substitution of equal cement masses were studied on the mechanical properties of high-performance concrete. The test results showed that the addition of metakaolin improved the cubic compressive strength, splitting tensile strength and flexural strength of HPC, among which the improvement in compressive strength was the most siginificant, and simultaneously, there was also an improvement in concrete toughness in a certain degree. The optimum content of metakaolin is 10% resulting in an increase of the cubic compressive strength of concrete by 8.3% correspondingly.

scholarly journals Mechanical and Static Stab Resistant Properties of Hybrid-Fabric Fibrous Planks: Manufacturing Process of Nonwoven Fabrics Made of Recycled Fibers

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1140 ◽  
Author(s):  
Yu-Chun Chuang ◽  
Limin Bao ◽  
Mei-Chen Lin ◽  
Ching-Wen Lou ◽  
TingAn Lin
Keyword(s):  
High Performance ◽  
High Strength ◽  
Woven Fabrics ◽  
Test Results ◽  
High Modulus ◽  
New Materials ◽  
Nonwoven Fabrics ◽  
Pet Fibers ◽  
Recycled Fibers ◽  
Hybrid Fabric

With the development of technology, fibers and textiles are no longer exclusive for the use of clothing and decoration. Protective products made of high-strength and high-modulus fibers have been commonly used in different fields. When exceeding the service life, the protective products also need to be replaced. This study proposes a highly efficient recycling and manufacturing design to create more added values for the waste materials. With a premise of minimized damage to fibers, the recycled selvage made of high strength PET fibers are reclaimed to yield high performance staple fibers at a low production cost. A large amount of recycled fibers are made into matrices with an attempt to decrease the consumption of new materials, while the combination of diverse plain woven fabrics reinforces hybrid-fabric fibrous planks. First, with the aid of machines, recycled high strength PET fibers are processed into staple fibers. Using a nonwoven process, low melting point polyester (LMPET) fibers and PET staple fibers are made into PET matrices. Next, the matrices and different woven fabrics are combined in order to form hybrid-fabric fibrous planks. The test results indicate that both of the PET matrices and fibrous planks have good mechanical properties. In particular, the fibrous planks yield diverse stab resistances from nonwoven and woven fabrics, and thus have greater stab performance.

Preparation and Verification of Properties of Alkali-Activated Composite

2019 ◽  
Vol 296 ◽  
pp. 209-214 ◽  
Author(s):  
Jana Boháčová ◽  
Lukáš Janalík
Keyword(s):  
Portland Cement ◽  
High Strength Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Strength Parameters ◽  
Strength Concrete ◽  
Principles Of Design ◽  
Alkali Activated

The paper deals to create alkali activated composite based on the recipe of high-strength concrete. The paper includes the review of conditions for high-strength concrete proposing and preparation. Principles of design of high performance concrete based on Portland cement as a binder were described. The experiment was focused on the strength investigation of composites with different ratios of cement to slag, and also the effect of used activator on strength parameters was investigated.

Shear strength of fiber-reinforced high-strength steel ultra-high-performance concrete beams based on refined calculation of compression zone depth considering concrete tension

2019 ◽  
Vol 22 (8) ◽  
pp. 2006-2018 ◽  
Author(s):  
Jianan Qi ◽  
Xiaomeng Ding ◽  
Zhen Wang ◽  
Yuqing Hu
Keyword(s):  
Shear Strength ◽  
High Strength Steel ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Limit State ◽  
High Strength ◽  
Test Results ◽  
Compression Zone ◽  
Ultra High Performance Concrete

This article presents an experimental and theoretical investigation on the shear behavior of fiber-reinforced ultra-high-performance concrete beams reinforced with high-strength steel. The test parameters included the fiber volume fraction, fiber type, and stirrup ratio. The test results indicate that the shear failure in ultra-high-performance concrete beams is not brittle and catastrophic but has ductility characteristics. A moderate quantity of stirrups can significantly improve the shear behavior of ultra-high-performance concrete beams, as reflected in the thorough propagation of cracks in both shear span and pure bending zone. The depth of the compression zone considering concrete tension was derived based on the deformation compatibility and force equilibrium equations for both serviceability limit state and ultimate limit state. The comparison of the proposed method and classical beam theory shows that the concrete tension should not be neglected in the serviceability limit state analysis. After cracking, the concrete tension can be neglected for simplicity when the beam is heavily reinforced and should be considered when the beam is lightly reinforced. Then, a shear strength model was established based on Rankine’s failure criteria, the truss model, and Association Francaise de Génie Civil-Sétra. Finally, the proposed shear strength equation was verified by the test results and compared with other shear strength equations.

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