Self-Compacting High-Strength Expanded Clay Concrete of B50-B65 Classes — a New Generation of Expanded Clay Concretes for Structures of High-Rise Building

The results of studies of the influence of expanded clay aggregate varieties (sand of fractions of 0–5 mm and gravel of fractions of 5–10 mm) of grades according to bulk density M250–M1000 and strength P35–P350 on the average density, compressive strength and initial modulus of elasticity of lightweight concrete of classes B16–B65 with average density grades D1300–D2000. The work was carried out in order to obtain high-strength lightweight expanded clay concrete of classes B50–B65 from highly mobile and self-compacting mixtures using light aggregates available for the construction industry. For the preparation of light concretes, Portland cement CEM 0 52.5 N, organo-mineral modifier MB10-50C, natural sand with Mk=2.5, expanded clay sand and gravel from three different manufacturers with a bulk density of 221–910 kg/m³ and a strength of 0.6–8.9 MPa were used. It has been established that with similar volumetric dosages of the components of concrete mixtures, the nature of the influence of the properties (density and strength) of expanded clay filler on the characteristics of lightweight concrete is similar. The introduction of heavy natural sand into the composition of concrete mixes instead of light expanded clay enhances the effect of increasing the strength and density of concrete. The minimum value of the strength of expanded clay filler, which ensures the compressive strength of concrete corresponding to class B50 with a grade of average density D1600, must correspond to grade P150. With an increase in the strength of expanded clay filler to a level corresponding to the P300 grade, the concrete strength increases to values corresponding to the B65 class with a D2000 average density grade. Self-compacting and highly mobile lightweight concretes of medium density grades D1600–D2000, compressive strength classes B50–B65 with the following characteristics were obtained, respectively: compressive strength (cubic strength) 60.3–74.5 MPa, axial compression strength (prismatic strength) 53.7–73.5 MPa, initial modulus of elasticity 21.2–25.8 GPa, which go beyond the classification range of light concretes provided for by the Code of Rules of SP 63.13330.2018.

S.S. KAPRIELOV¹, Doctor of Sciences (Engineering), Academician of the RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.V. SHEINFELD¹, Doctor of Sciences (Engineering), RAASN Advisor (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.M. SELYUTIN², Engineer, (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Scientific Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev JSC “Research Center of Construction” (6, bldg. 5. 2nd Institutskaya Street, Moscow 109428, Russian Federation)
² LLC “Master Concrete Enterprise” (31, Saratovskaya Street, 109518, Moscow, Russian Federation)

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