Influences of nano-particles on dynamic strength of ultra-high performance concrete

Microstructure and compressive properties of silicon carbide reinforced geopolymer

“…One can see that in our work, the optimized process and concentration of GP/SiC p , led to a significant improvement of compressive strength (~155 MPa) which is comparable to that of the steel fiber reinforced geopolymer [35]. This value is close to the level of human bone [28] and reaches the level of superhigh strength concrete [27].…”

“…Typically, the compressive strength of a MK based geopolymer can attain above 70 MPa, which is comparable to the normal concrete [23][24][25][26]. In order to extend the applications of geopolymers, such as ultrahigh-performance-concrete (over 120 MPa) [27] and human bone replacement (over 160 MPa) [28], the compressive strength of geopolymers and their composites are required to be further improved.…”

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

“…Nano-concrete is a construction material that uses nanoparticles with a size of less than 500 nm [161]. Low electrical resistivity [162], self-sensing [163], self-monitoring capability [164], self-cleaning [165], self-healing [166], high ductility [167], self-control of cracks [168], reduction of shrinkage [169], thermal conductivity [170], and high mechanical performance (Table 3) [164,185] Nano-SiO 2 and nano-Fe 2 O 3 Improved compressive strength (3% opt dosage for nano-Fe 2 O 3 and 10% for nano-SiO 2 ) Fan et al [189] Synthetic nano-ZrO 2 Development in mechanical properties as a results of the pore filling and bridging action Li et al [190] Nano-alumina There is no clear trend for the increase of compressive strength (5% opt dosage at 7 days and no opt dosage for 28 days) Li et al [162] Carbon nanotubes (CNTs) Using treated or untreated CNTs in cement paste causes a noticeable improvement in compressive sensitivity Mann [191] Carbon nanotube Improved compressive and flexural strengths Sobolev et al [192] SiO 2 nanoparticles Improved compressive and flexural strengths Sadrmomtazi et al [193] Nano-SiO 2 Improved compressive (7% opt dosage) Nazari et al [186] Al 2 O 3 nanoparticles Improved flexural strength (1% opt dosage) Nazari et al [187] TiO 2 nanoparticles Improved tensile splitting and flexural strengths of concrete along with a reduction in setting time (1% opt dosage) Givi et al [194] SiO 2 nanoparticles Mechanical properties of mixtures containing SiO 2 particles with average particle size of 15 nm are higher than those containing 80 nm particle size Morsy et al [195] Nano-metakaolin Tensile and compressive strength increased (1.5% opt dosage for 80 nm nanoparticles and 1.0% opt for 15 nm) Morsy et al [196] Carbon nanotubes and nano-clays Addition of 6% nano metakaolin increased compressive strength of mortar containing carbon nanotube (0.02% opt dosage) Shekari et al [197] Nano [198] Nano-SiO 2 particles An increase in compressive strength (mixture containing 10% ground ceramic powder and 1% nanoparticle have the highest compressive strength) Morsy et al …”

Effect of Nano‐CaCO3 on the Mechanical Properties and Durability of Concrete Incorporating Fly Ash

“…e F value is a major pointer reflecting the significance of factors. For a certain factor, the significance can be evaluated by comparing the F value with predetermined significance criteria: F 0.01 (2,8) and F 0.05 (2,8). A factor F value > F 0.01 (2, 8) indicates a major impact; F 0.05 (2,8) (2,8) indicates a minor impact.…”

“…Moreover, fly ash possesses pozzolanic activity that reacts with calcium hydroxide (CH) during cement hydration, forming additional hydration products such as calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H) [4]. Most previous studies [5][6][7][8][9][10] have shown that these hydration products of the pozzolanic reaction can effectively improve the density of concrete, leading to higher strength and better durability. For instance, the resulting reduced permeability of concrete can inhibit damage to the concrete through the alkali-aggregate reaction.…”