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DIFFERENTIAL THERMAL RESEARCH OF THE OBTAINED SUPER- AND HYPERPLASTICIZERS

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Ўзбекистон кимё журнали

Ўзбекистон кимё журнали

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Background. The main directions of improving the performance of cement composites are improved manufacturability, increased strength and durability. In the modern building materials science more preference is given to the development of plasticizing additives for concrete mixtures and concrete, allowing solving several technological problems. Purpose. Study of differential thermal analysis of obtained plasticizers. Methodology. Data of differential thermal analysis was recorded on the derivatograph system Paulik - Paulik - Erdei at rate of 10 g / min with sample’s weight 0.114 - 0.173 g, sensitivity of galvanometers T- 900, TG-200 DTA-1/10 DTG-1/20. Recording was carried out under atmospheric conditions. Holder was performed with corundum crucible, diameter of 10 mm, without cover. We used Al2O3 as reference. Originality. In the study of differential - thermal analysis of obtained plasticizers, changes in the temperature interval at thermal processing of wet concrete mixtures were identified. Findings. At a curve of differential thermal analysis of superplasticizer SDJ-1, 4 endo-effects in the following ranges: 403-423 K; 481-493 K; 546-559 K and 618-653 K were detected, which show the chemi- cal and phase transitions of polymers. The first three endo-effects usually show removal of weakly or strong- ly bound water molecules, the beginning of the melting and decomposition of polymers. The observed exo- effects in the temperature ranges: 546-559 K; 603-618 K; 668-793 K; 833-893 K; 1023-1063 K and 1068- 1113 K show stitching, increased crystallinity and oxidation of the superplasticizer SDJ-1. 2 endoeffects are observed in the following intervals at the curves of differential thermal analysis of hyperplasticizer: 313-363 K; 421-531 K, which show the removal of weakly or strongly bound water molecules, the beginning of melt- ing and the decomposition of polymers. Exo-effects in other temperature ranges indicate stitching, increased crystallinity and oxidation of hyper-plasticizer. -mechanism of action of superplasticizers was investigated; -phase changes in hyperplasticizers were studied by thermogravimetry.

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# дифференциальный термический ана# термогравиметрия# эндо- и экзо- эффекты.# differensial termik tahlil# termogravimetriya# endo- va ekzoeffektlar.# differential thermal analysis# thermogravimetry# endo- and exoeffects.  Highlight

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https://eroi.uz/11.0030/A0220-0051

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References

Khayat K.H., Hwang S.D. Effect of High-Range Water-Reducing Admixture Type on Performance of Self-Consolidating Concrete// ACI-Special Publication 239, 2006, pp. 185-199.

Koizumi K., Umemura Y., Tsuyiiki N. Effects of Chemical Admixtures on the Silicate Structure of Hydrated Portland Cement// Proceedings of the 12th International Congress on the Chemistry of Cement. - Montreal, 2007. P. 64-71.

Koizumi, K. Effects of Chemical Admixtures on the Silicate Structure of Hydrated Portland Cement // Proceedings of the 12th International Congress on the Chemistry of Cement. - Montreal, 2007.P. 64-71.

Haehnel C., Lombois-Burger H., Guillot at alias L. Interaction Between Ce¬ments and Super plasticizers// Proceedings of the 12th International Congress on the Chemistry of Cement. - Montreal, 2007. - P. 111-125.

Chen Y.L., You W.L. The Composite Effect of Mineral Additives to the Performances of Concrete// Proceedings of the 12th International Congress on the Chemi¬stry of Cement. - Montreal, 2007. - P. 289-301.

Gamaliy E.A. Kompleksnye modifikatory na osnove efirov polikarboksilatov i aktivnyh mineralnyh dobavok dlya tyazhologo konstructsionnogo betona: dis. ... kand. teh. nauk: 05.23.05 / Gamaliy E.A.- Chelyabinsk, 2009. -217 s.

Savitskaya T.A. Vliyaniye vodorastvorimyh polimerov na ustoychivost I reologicheskiye svoystva suspenziy voloknistogo aktivirovannogo uglya// Kolloidnyy zhurnal. - 2006. - Т. 68. –No. 1. - S. 93 - 99.

Rahimbaev Sh.M. Reologicheskiye svoystva penotsementnyh system s dobavkoy anionnogo penoobrazovatelya // Vestn., dokl.: nauch. - teoret. zhurn.- 2003.-Ch.4.-S.6-14.

Pustovgar A.P. Effektivnost primeneniya sovremennyh superplastifikatorov v suhih stroitelnyh smesyah // 4-ya Mezhdunarodnaya nauchno-tehnicheskaya konferentsiya «MixBULD». 2002. -S.123-126.

Karimov M. U., Vafaev O.Sh., Djalilov A. T. Study of the IR spectra obtained superplasticizer and its influence on the physico-chemical and physico-mechanical properties of the cement compositions// Journal “European applied science” –Germany. –No.8. -2015. -p.77-81

Karimov M.U., Djalilov A.T., Samigov N.A., Nurkulov F.N., Zokirov J. Synthesis and application of plasticizing additives for cement//“Modern Problems of Polymer Science” Programm and abstract book of 9 th Saint – Petersburg Young Scientists Conference, November 11-14, 2013, Saint – Petersburg, p. 41

Karimov M.U., Djalilov A.T., Samigov N.A. Zokirov J.S. A study of the synthesis of hyperplasticizer and its influence on the properties of cement systems// “Modern Problems of Polymer Science” Programm and abstract book of 11 th Saint – Petersburg Young Scientists Conference, November 9-12, 2015, Saint – Petersburg