The study focuses on improving the strength characteristics of wood-gypsum composite material by adding lime as a modifying additive. Data on determining strength parameters, such as compressive strength and tensile strength in transverse bending, were obtained in accordance with GOST 23789-2018 "Gypsum Binders. Test Methods" for six beam samples measuring 4×4×16 cm made from wood-gypsum material and wood-gypsum material with lime as a modifying additive. The analysis of the results determined the optimal amount of lime to be added. It was found that the maximum tensile strength in bending is 1.93 MPa, corresponding to a lime content of 17.5%. Additionally, the main reactions occurring during the setting of the gypsum binder with lime in an aqueous medium, leading to structural changes in the material, were identified. To assess structural changes, an analysis was performed using mercury porosimetry, based on measuring the pressure required to force non-wetting mercury liquid into the sample's pores. Key data on pore diameters and their quantitative distribution in the material structure were obtained. The main porosity values of the material were also presented and analyzed. The study concludes the impact of lime as a modifying additive on the strength characteristics and structural changes of wood-gypsum composite material. The findings define the application scope for products made from wood-gypsum composite material with lime as a modifying additive.
gypsum, wood-gypsum composite, lime, finishing material, mercury porometry
1. Bondarenko, V.M. Stroitel'nye otdelochnye materialy s fotokataliticheskimi svoystvami dlya degradacii himicheskih pollyutantov vozduha / V.M. Bondarenko, B.A. Bondarev, A.O. Korneeva.
2. Patent № 2788603 C1 Rossiyskaya Federaciya, MPK C04B 28/14, C04B 18/26. Drevesno-gipsovyy kompozit : № 2022108904 : zayavl. 04.04.2022 : opubl. 23.01.2023 / A. V. Erofeev, T. I. Gorohov.
3. Patent № 2795289 C1 Rossiyskaya Federaciya, MPK C04B 28/14, C04B 18/26. Drevesno-gipsovyy kompozit : № : 2022119149 : zayavl. 13.07.2022 : opubl. 02.05.2023 / A. V. Erofeev, T. I. Gorohov, A. A.
4. Kovalev N.S. Issledovanie ekspluatacionnyh svoystv drevesno-gipsovogo kompozita optimal'nogo sostava // N.S. Kovalev, T.I. Gorohov, A.V. Erofeev, S.I. Gorohov // STROITEL'NYE MATERIALY.
5. Gorokhov, T.I. Implementation of the mathematical planning of an experiment method in selecting optimal composite material based on gypsum binder filled with wood filings / T.I. Gorokhov, A.V. Erofeev.
6. Storodubceva, T.N. Analiz vliyaniya izmeneniya temperatury na drevesnyy polimernyy kompozicionnyy material / T.N. Storodubceva, B.A. Bondarev, A.O. Korneeva // Sovremennye mashiny.
7. Proektirovanie sostava stroitel'nyh kompozitov s uchetom termodinamicheskoy sovmestimosti vysokodispersnyh sistem gornyh porod / A. S. Tutygin, A. M. Ayzenshtadt, V. S. Lesovik [i dr.].
