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*Lapko K.N., Cand. Chem. Sc., Associate Professor; Apanasevich N.S., junior researcher trainee; Shulga T.N.,
engineer; Kudlash A.N., senior lecturer; Galeeva N.N., Reseacher; Belarusian State University, Minsk, Belarus
DRY BUILDING MIXTURES BASED ON SOLID PHOSPHATE BINDERS FOR THERMOSTABLE FUNCTIONAL MATERIALS
Abstract
In order to improve the preparation method of thermostable composite materials based on phosphate
binders the possibility of using of solid magnesium phosphate Mg(H 2PO4)2·4H2O and solid calcium phosphate
Ca(H2PO4)2·H2O as binders was studied. In present communication we report on studying of mechanical properties
and thermal stability of phosphate composites. The thermal treatment of the composites based on solid
phosphate binders up to 1000 oC leads to the 3 times successive increase of the composites strength. Thermal
behavior of phosphate matrix demonstrates its good performance for designing of thermostable composite
materials.
Key words: thermostable composite material; solid phosphate binder; dry building mixture; microwave
treatment.
1.
Introduction
The beams with depth of 400 mm were loaded in four point bending test by 2 jacks located 0.8 m from the
midspan. The total camber of the UHPC beam before the test was about 120 mm, the deflection was 310 mm and
when loads were removed, the remaining plastic deflection of just 15 mm was measured (Fig.1).
Fig. 1. Deflection of the pretensioned UHPC beam under testing load, unloaded UHPC beam with camber due to
prestressing is nearby
Comparison of prestressed concrete, UHPC and steel beams for the span of 12 m is shown in the
Table 1 as follows. The beams with depth of 400 mm were loaded in four point bending test by 2 jacks
located 0.8 m from the midspan. The total camber of the UHPC beam before the test was about 120
mm, the deflection was 310 mm and when loads were removed, the remaining plastic deflection of just
15 mm was measured.
Table 1. Comparison of beam basic properties related to different materials
Material of beam
PC (prestressed
concrete)
UHPC
Steel
Depth, mm
Max. load, kN
Max.
deflection, mm
Weight, t
Cost, %
750
2x170
110 mm
4,9 t
100
400
360
2x170
2x170
310 mm
700 mm
2,7 t
1,8 t
160
300
Among another applications tested by Skanska were UHPC columns for anti-noise barriers and lost
permanent UHPC formwork for the bridge deck… [1].
7. Conclusions
В работе получены и исследованы термостойкие композиционные материалы на основе твердых
фосфатных связующих. Показано, что характер термического поведения исходной фосфатной композиции
свидетельствует о перспективности её использования в качестве термостойкой матрицы для получения
композиционных материалов.
References // Литература
1.
2.
3.
4.
Ambroise J. Properties of metakaolin blended cements. Рaris, 2012.
Ambroise J., Maximilien S., Pera J. Properties of metakaolin blended cements// Advanced Cement Based
Materials. 1994. Vol. 1. N 4. P. 161–168.
Ding J.T., Li Z.J. Effects of metakaolin and silica fume on properties of concrete// ACI Materials Journal.
2002. Vol. 99. N 4. P. 393–398.
Siddique R., Klaus J. Influence of metakaolin on the properties of mortar and concrete (a review)// Applied
Clay Science. 2009. Vol. 43. N 3–4. Р. 392–400.