Study on performance improvement of ultra-high performance concrete by vibration mixing

Zheng, Yangzezhi; Zhou, Yang; Huang, Xiaoming; Min, Yaochun; Luo, Haoyuan; Chen, Yuan; Li, Weihuan

doi:10.1016/j.conbuildmat.2022.126823

Cited by 17 publications

(9 citation statements)

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“…The slump of fresh UHPC with both normal mixing and vibration mixing was 290 mm. Similar to UHPC without fiber [31], vibration mixing had little effect on the workability of UHPC. The main reason may be that this test used a polycarboxylic acid SP with a solid content of 40%, which made the fresh UHPC have better workability.…”

Section: Mechanical Test Resultsmentioning

confidence: 87%

“…The preparation principle of UHPC is the MAA theory and the maximum density theory [34,35], where Portland cement, river sand, silica fume, fly ash, SP and fibers are mixed together in tightly packed and maximum density theory. Based on the previous research results [31], the specific mixing mass ratio is: binder: sand: water: SP: fibers = 1240:992:200:14:195, where binder equals to the sum of the Portland cement, silica fume and Fly ash, which means that B/S = 1240/992 = 1.25, and W/B = 200/1240 = 0.16.…”

Section: Specimen Preparationmentioning

confidence: 97%

“…The same proportion of raw materials of UHPC will be mixed by DT60ZBW twin-shaft vibratory mixer [31,36]. The power for the machine is selected appropriately, where 3 kw is used in vibration input power and the mixing input power is 5.5 kw.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…Vibration mixing has been proven to have a positive effect on the mechanical properties of UHPC [31]. The vibration action maximizes the UHPC slurry movement action through the conversion from electrical energy to mechanical energy and finally to concrete internal energy.…”

Section: Mechanismsmentioning

confidence: 99%

“…Vibration mixing technology has been proven to have a positive effect on the static mechanical properties of fiber-free concrete [31]. The mixing motion of conventional mixers consists of circular, axial and radial movements.…”

Section: Introductionmentioning

confidence: 99%

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Effect of a Novel Vibration Mixing on the Fiber Distribution and Mechanical Properties of Ultra-High Performance Concrete

et al. 2022

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A novel double-axis vibration mixing technology is presented to further enhance the performance of ultra-high performance concrete (UHPC). It improves the problem of inefficient zone in concrete mixing and enhances the homogeneity of concrete through the coupling of vibration and velocity fields during mixing. The X-CT scan results demonstrate that this novel technology improves the fiber distribution coefficient from 0.512 to 0.581. Moreover, the standard deviation of fiber orientation is reduced, the proportion of invalid fibers is decreased, and the pore space distribution is more uniform. The mechanical experimental results show that the new vibration mixing technology improves the mechanical properties of UHPC, and the percentage of early strength improvement is more significant; the impact compressive strength and the toughness of UHPC are also strengthened. The vibration mixing technology is expected to achieve the reduction of raw materials dosage with the same mechanical properties to reduce the cost and carbon emission.

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Section: Mechanical Test Resultsmentioning

confidence: 87%