Search results

In the mix proportion design of HVFAC, the three-dimension model is found by the relation of strength to water-cementitious materials ratio, and ash-cementitious materials ratio(i.e. the dosage of fly ash), and with water-cementitious materials ratio and ash-cementitious materials ratio increasing its strength is decreased by nonlinear way.
And water-cementitious materials as decreasing as possible and suitable using long age latent strength is the technical key of mix proportion design for HVFAC.
Due to the dosage of fly ash in HVFAC is very large, low early age strength is one of shortcomings in practical application under lower total comentitious materials.
Using ground granulated blast-furnace slag (GGBS) instead of cement, the CH content of paste is much higher than that of fly ash cement so that the carbonation resistance of mineral cement materials is obviously higher than that of fly ash cement materials.
C. : Abrasion Resistance of Concrete, Journal of ACI, Vol. 78, No. 5, 1981, pp. 341-352

As a result, the mixture combustion process becomes unstable and explosive, which leads to the destruction of pyrotechnic products with the formation of high-temperature products (debris of product bodies, parts of mixture charges, heated to high temperatures 3000...4000 K) products of combustion of mixtures, etc.), which scatter in different directions and have a fire hazard for surrounding objects (wooden buildings, combustible and lubricating materials, launchers with service personnel and etc.) [8, 10].
Garasymiiuk, Application of gas-aerosol-powder fire-extinguishing mixtures for protection against incendiary mixtures, Scientific Journal Science Rise, 2(22) (2016) 11–14
Improvement of a discharge nozzle damping attachment to suppress fires of class D, Eastern-European Journal of Enterprise Technogies, 5 (95) (2018) 68–76
Fire and explosion hazard of substances and materials.
Vashchenko, Increasing the fire safety of pyrotechnic nitrate-metal mixtures in conditions of external thermal effects, International Scientific Journal “Intenauka”, Kyiv, (2020) № 5/5799

PP fiber shows the major play an important role to improve the ductility of composites members containing cementitious materials [13-17].
Materials and Experimental Cement The Ordinary Portland (53 grade) cement was used and its properties of cement are represented in Table 1.
International Journal of Engineering Science Invention, Vol. 2, No.2 (2013), 24-31 [2] Megat Johari, M.A., Brooks, J.J., Kabir, S. and Rivard, P., “Influence of supplementary cementitious materials on engineering properties of high strength concrete”, Construction and Building Materials, Vol.2, No.5, (2011), 2639–2648
“An experimental study on optimum usage of GGBS for the compressive strength of concrete, Cement and Concrete Composites, vol. 29, No. 6, (2007), 505-514 https://doi.org/10.1016/j.cemconcomp.2007.01.001 [8] Soroushian, P., Khan, A., and Hsu, J.W., “Mechanical Properties of Concrete Materials Reinforced with Polypropylene or Polyethylene Fibres”, ACI Materials Journal, Vol. 89, No.2, (1992), 535-540
“Mechanical Properties and Durability of Polypropylene Fibre Reinforced High-Volume Fly Ash Concrete for Shotcrete applications”, ACI Materials Journal, Vol. 91, No.5, (1994), 478-486

Plant fiber concrete in the cement base material (cement, mortar or concrete) to join the natural plant fiber, to form a new type of concrete, its advantages can improve the performance of concrete, concrete to reduce costs, save energy.
Through the development and application of such materials, we can offer a wealth of plant fibers opened up a new area of application, raising the level of comprehensive utilization of plant fiber; decrease the serious damage caused due to improper waste resource treatment.
Low prices, select material conveniently reduces the cost of fiber reinforced concrete, green environmentally friendly, renewable green building requirements now.
Straw fibers are a selects material conveniently, green environmental protection, renewable resources, which has obvious advantages compared with other traditional fiber, it provides a choice to reduce concrete costs.
Journal of Jilin Architecture and Civil Engineering Institute, 2005(1):1-2

The SiO2 particles with average size of 20-30 nm in diameter were supplied by School of Materials Science and Engineering of ECUST.
As a result, amorphous alloys possessed high corrosion resistance characteristics compared to crystalline material counterparts.
Materials Science and Engineering A 198, 145 (1995)
Corrosion Science 45, 485 (2003)
International Journal of Minerals, Metallurgy and Materials 16, 444 (2009) [5] M.

The high speed milling experiments had also been done with other materials on different machining tool, the result was the same. 1.0 0.8 0.6 0.4 0.2 0 1.6 3.2 4.8 6.4 8.0 9.6 11.2 12.8 cutting length (m) Cutting force (KN) L=13mm L=15mm L=19mm Fig.1 Effect of extended length on cutting force Cutting vibration.
Acknowledgment The research was supported by Guangdong Science &Technology Plan (2003A1040307), Guangzhou Science &Technology Plan (2003Z1-D9031) and Guangxi Science &Technology Plan(0330005-10) References [1] H.Schulz, St.Hock.
Materials and Design,2000,21,395-402 [4] Y.N.Hu, C.Y.Wang, J.L.Wang, Z.Qin.
Materials Science Forum; 471-472 (2004)p374-379 [5] T.Miyaguchi, M.Masuda, E.Takeoka, H.Iwabe.
Journal of International Societies for Precision Engineering and Nanotechnology. 2001,25,145-154 [6] S.Smith, W.R.Winfough, J.Halley.

Concrete is a porous material.
It is generally accepted that the flexural behavior of a RC member depends on the stress-strain relationship of the materials used.
Concrete is a porous material.
Polak, Influence of freezing-and-thawing damage on behavior of reinforced concrete elements, ACI Materials Journal, 104(4), (2007):369-378
Qian, Effect of freeze-thaw cycles on the stress-strain curves of unconfined and confined concrete, Materials and Structures, in press

This is why measuring the stresses in bulk materials with coarse grains is difficult.
Thus, the DEM is suitable for strain measurement of bulk materials such as coarse grains and welded parts.
Additionaly, this method is characterized by residual stress evaluation of bulk materials.
Shobu: Quantum Beam Science, Vol. 4, No. 3 (2020), p. 1
Ledbetter: British Journal of Non-Destructive Testing, Vol. 23 (1981), p. 286

Acknowledgments The authors are grateful for the supports of National Natural Science Foundation of China (No.50878098, No.50908103).
According to different environmental conditions, different cover thickness and materials should be specified.
References [1] GrardB., MarchandJ.Influence of cracking on the diffusion properties of cement-based materials Part I: Influence of continuous cracks on the steady-state regime[J].
Journal of Materials in Civil Engineering, 2003, 15(1): 183-191
International Journal of Solids and Structures, 2007,44(18):5848-5874

Fig. 3 (a) and (b) shows that no grain can be found in the as-received and batch_1 material.
Acknowledgement The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under Contract No.
Chan, et al., Modeling of grain size effect on micro deformation behavior in micro-forming of pure copper, Materials Science and Engineering A, 527(2010) 6638-6648
Hu, State of the art in micro forming, International Journal of Machine Tools and Manufacture, 46 (2006) 1172-1179
[5] ASTM, 1989, Annual Book of ASTM Standards: Metallography, nondestructive testing, Press: American Society for Testing & Materials, 121-155