Study of the properties in the fresh and hardened state of self-compacting lightweight concrete

Verzegnassi, Emerson; Altheman, Dener; Barbosa, Luísa Andréia Gachet; Lintz, Rosa Cristina Cecche

doi:10.1016/j.matpr.2022.04.403

Cited by 1 publication

(1 citation statement)

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“…The average density of LWSCC over 1200 kg/m 3 usually meets the requirements for use as a structural material [16]. The authors of [18] described the experience of preparing lightweight self-compacting concrete compositions on expanded clay aggregate without segregation or flotation. This paper proposes an effective combination of expanded clay of various fractional compositions (breakstone and sand with an average particle diameter of 9.5 and 4.5 mm, respectively).…”

Section: Introductionmentioning

confidence: 99%

Conditions for the Preparation of Self-Compacting Lightweight Concrete with Hollow Microspheres

Inozemtcev,

Epikhin

2023

Materials

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Producing self-compacting concrete with lightweight aggregates is a difficult task. Mixtures with a high content of expanded aggregate tend to separate. It is possible to evaluate the possibility of producing self-compacting lightweight concrete with low average density. This work presents the results of a study of self-compacting lightweight concrete on hollow microspheres. The ability of a lightweight concrete mixture on hollow microspheres with low density (ρ = 1450 ± 25 kg/m3) to self-compact has been established. The closeness in the values of the spreading diameter before and after shaking on the table Dsp,1 → Dsp,2 confirms this. The dependences (regression equations) of mobility, coefficients of the Ostwald–Weil equation, and density and strength on the W/C ratio and plasticizer concentration for lightweight concrete with a volume content of hollow microspheres of 46.4% have been established. The limits for homogeneity of lightweight concrete mixtures on hollow microspheres are W/C ≤ 0.6 and CPl ≤ 1.0%. The dispersion of quartz sand (varying the Sp/Sf ratio) in an amount of 8.7% in the composition of lightweight concrete does not have a significant effect on the self-compaction criterion and physical and mechanical properties. Changes in the physical and mechanical properties of lightweight concrete on hollow microspheres in the selected range of varying the W/C ratio and plasticizer concentration are in the following ranges: ρ = 1403–1485 kg/m3, Rfl = 3.34–5.90 MPa, Rcom = 29.6–45.7 MPa. The presence of delamination at W/C ≥ 0.6 does not allow one to correctly establish the influence of variable factors.

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Section: Introductionmentioning

confidence: 99%