Application of Filtration Pressing Technology in the Manufacture of Roofing Products

One of the technological possibilities of filtration pressing of cement-sand compositions with synchronous extraction of squeezed water is investigated. The technology of filtration pressing of compositions containing 20–30% of Portland cement and 70–80% of quartz sand of small fractions with the subsequent addition of water, in an amount of 50–70% of the cement mass, includes processing of samples under the pressure of 5–10 MPa for 2–4 minutes. Through the mold filter, up to 60% of the excess mixing water was removed from the molding mass. The introduction of a micro-filler in the composition when producing cement-sand products using filter-press technology makes it possible to improve significantly the formability of the mixture and the workability under the conditions of pressing, get a more dense structure of the material and increase its durability. It is shown that the filtration pressing technology achieves greater water reduction at relatively moderate pressures from 5 to 10 MPa than when using superplasticizers. Tests of samples of the products obtained have shown that they have a compressive strength (at the age of 28 days) of 100 MPa and more, a bending strength of 20 MPa and more; frost resistance – more than 500 cycles of alternate freezing and thawing; low water absorption (1.5% or less), which can significantly increase the durability of the resulting roofing products.

E.A. SINITSINA¹, assistant, (This email address is being protected from spambots. You need JavaScript enabled to view it.),
I.V. NEDOSEKO¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.M. KHALIKOV¹, Candidate of Sciences (Chemistry) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.N. PUDOVKIN², Candidate of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Ufa State Petroleum Technological University (195, Mendeleeva Street, Ufa, 450080, Russian Federation)
² Kumertau branch of Orenburg State University (3B, 2nd Lane Soviet, Kumertau, 453300, Russian Federation)

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