Strength, permeation, freeze-thaw resistance, and microstructural properties of self-compacting concrete containing sandstone waste

The paper presents the results from the research on self-compacting concrete with different steel fibre type addition. The reference self-compacting concrete mix with water/binder = 0.33 was prepared, then modified with steel fibres in the amounts of 0–60 kg/m3 and air entrained with polymer microspheres (40 μm diameter). The major objective of the research was to determine the effect of steel fibre and air content on the self-compacting concrete mix properties and hardened concrete frost durability. The tests also included internal cracking and scaling resistance evaluation for concrete specimens subjected to cyclic freeze-thaw process − two beams were frozen in air and two beams were partially submerged in water and then frozen. The scaling resistance was tested using the slab method on the specimens with sawn surface and on the specimens with natural finished surface. Non-air entrained steel fibrereinforced concretes, despite their high strength class (C55/67–C60/75) and medium absorption (4.34–5.11%), showed unsatisfactory resistance to internal cracking and scaling tests. The beams partially submerged in water failed after 100 freeze-thaw cycles, which confirms a significant influence of water uptake from moist environment during freeze-thaw cycles and the acceleration of the damage process. Test results indicate that air entrainment with polymer microspheres is a very effective method and allows obtaining very good air pore structure parameters and frost resistance results. The specimens with top − finished surface exhibited less damage in the scaling resistance tests in relation to the specimens with sawn surface.

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Research of Steel Fiber Self-Compacting Concrete Frost Resistance

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.721 ◽

2012 ◽

Vol 174-177 ◽

pp. 721-725 ◽

Cited By ~ 1

Author(s):

Ming Bao Gao ◽

Yan Ru Zhao ◽

Xiao Yan He

Keyword(s):

Elastic Modulus ◽

Frost Resistance ◽

Steel Fiber ◽

Concrete Specimen ◽

Test Method ◽

Dynamic Elastic Modulus ◽

Self Compacting Concrete ◽

Freeze Thaw ◽

Thaw Cycle ◽

Freeze Thaw Cycle

With the fast freeze-thaw test method, the c50 steel fiber self-compacting concrete was carried out 300 tests of freeze-thaw cycle. In the process of freeze-thaw cycles, it determined by the quality of the concrete specimen, dynamic elastic modulus and strength, and analyzed the steel fibers and their different contents on frost resistance of self-compacting concrete impact. The results showed that: steel fiber self-compacting concrete in freeze-thaw cycle can play constrained role in the quality loss, dynamic elastic modulus and intensity, and can significantly improve the self-compacting concrete frost resistance. Within a certain range, the more steel fiber, the stronger of frost resistance.

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Experiment Study on the Durability of Dry-Mixing Self-Compacting Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.493 ◽

2011 ◽

Vol 250-253 ◽

pp. 493-496 ◽

Cited By ~ 1

Author(s):

Lan Zong ◽

Shi Ping Zhang ◽

Pei Xin Liang

Keyword(s):

Pore Structure ◽

Frost Resistance ◽

Chloride Ions ◽

Experiment Study ◽

Self Compacting Concrete ◽

Freeze Thaw ◽

Coarse Aggregates ◽

Carbonation Resistance ◽

Dry Mixing ◽

Chloride Ions Diffusion

Durability of dry-mixing self-compacting concrete was evaluated through carbonation testing, freeze-thaw testing and chloride ions diffusion testing. The results indicate that carbonation resistance, frost resistance and chloride ions diffusion of durability of dry-mixing self-compacting concrete are excellent, compared with normally vibrated concrete (NVC). Durability of dry-mixing self-compacting concrete shows a better pore structure. Furthermore, the more the content of coarse aggregates is, the poorer the pore structure becomes.

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