Deformation properties of wood-cement materials

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Abstract

The results of studies of deformations of wood-cement materials arising under the action of short-term loads are presented. For this purpose, the initial modulus of elasticity and the Poisson’s ratio of wood-cement materials were determined. It is established that the value of the initial modulus of elasticity ranges from 335...495 MPa, depending on the class of wood-cement material in compressive strength B0,35...B1, and the Poisson’s ratio is within 0,154...0,101. It is established that with an increase in the relative volume content of cement c2 from 0,50 to 0,58, the value of the initial modulus of elasticity increases and the shear modulus of the wood-cement material, and the Poisson’s ratio decreases. It was found that for heat-insulating wood-cement material, an increase in the relative volume content of filler (ash) c4 from 0 to 0,1, with constant consumption of binder and organic filler, also allows increasing the value of the initial modulus of elasticity and shear modulus. For wood-cement material with a filler made of wood chips (wool), the value of the initial modulus of elasticity was 134 MPa, and the Poisson’s ratio was 0,062. The coefficient of elasticity of wood-cement material, depending on the class, ranges from 0,60 to 0,75, and the coefficient of plasticity from 0,26 to 0,36. The obtained value of the ultimate compressibility of wood-cement material on average for the class of wood-cement material in terms of compressive strength B0,35, B0,75 and B1 is 2,55 mm/m. It is noted that the obtained values of the initial elastic modulus and Poisson coefficients of wood-cement materials are in good agreement with the data of previously performed work, however, they, as well as the strength of wood-cement materials, turned out to be 20...25 % lower than theoretical ones. It has been established that the conglomerate structure of wood-cement material determines the manifestation of both elastic and plastic properties associated with the formation and accumulation of microcracks, with the plastic properties of the gel component of cement stone. It is concluded that previously obtained analytical dependences can be used to predict creep deformations and shrinkage of wood-cement materials depending on the age of loading.

About the authors

Vyacheslav I. Zaprudnov

BMSTU (Mytishchi branch)

Author for correspondence.
Email: zaprudnov@mgul.ac.ru

Dr. Sci. (Tech.), Professor

Russian Federation, 1, 1st Institutskaya st., 141005, Mytishchi, Moscow reg.

Vladimir V. Nikitin

BMSTU (Mytishchi branch)

Email: nikitinvv@bmstu.ru

Dr. Sci. (Tech.), Associate Professor

Russian Federation, 1, 1st Institutskaya st., 141005, Mytishchi, Moscow reg.

Sergey P. Karpachev

BMSTU (Mytishchi branch)

Email: karpachevs@mail.ru

Dr. Sci. (Tech.), Professor

Russian Federation, 1, 1st Institutskaya st., 141005, Mytishchi, Moscow reg.

Georgiy A. Makhnin

BMSTU

Email: makhninga@student.bmstu.ru

Student

Russian Federation, 5, Block 1, 2nd Baumanskaya st., 105005, Moscow

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