SVIBOR - Project code: 2-15-029

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 2-15-029

HIDROINSULATING MATERIALS: STRUCTURES, MECHANISMS AND PROPERTIES

Main researcher: MATUSINOVIĆ, TOMISLAV (29886)

Assistants

HODŽIĆ, EMIR (15934)
VRBOS, NEVENKA (43044)

Type of research: applied
Duration from: 01/01/91. to 01/01/95.

Papers on project (total): 19
Papers on project quoted in Current Contents: 3

Institution name: Fakultet kemijskog inženjerstva i tehnologije, Zagreb (125)
Department/Institute: Department of Inorganic Chemical Technology and Nonmetals
Address: Marulićev trg 20
City: 10000 - Zagreb, Croatia

Communication: Phone: 385 (0)1 4552-477; Fax: 385 (0)1 4550-725

Summary: The development of new hydroinsulating rapid setting and hardening materials is based on the correlation of chemical structure of inorganic compounds structures and their properties. From information about the possibility of chemical compaund synthesis and its reactivity, effectiveness of new materials could be predicted. The new hydroinsulating material has been developed. The active parts of the material deeply penetrate the capillary system of the construction objects where they react. The insoluble compounds clog up the capillarie and pores. After this procedure the objects would be permanently protected from water and moisture. In the research of rapid setting and hardening cement materials alkali metal salts as set accelerators of high alumina cement (HAC) have been studied. Along with rapid setting alkali metal salts cause the strength development at early ages. Proper selection of the alkali metal salts and concentration can lead to rapid setting and hardening materials without quality deteriaration. Except for the development of new materials the reearch has been contributed to the better understanding of kinetics and mechanisms of rapid setting and hardening of high alumina cemant in the presence of alkali metal salts. The process obeys a simple first-order reaction rate in the period of six hours after first appearance of the strength. The action of lithium-containing setting accelerators is based on a shortening the induction period, while they have no effect in the rate of hardening.

Keywords: accelerators agents, admixtures, alkali salts, cement pastes, compressive strength, flexural strength, high alumina cement, hydration, hydroinsulating materials, lithium salts, mortars (material), rapid setting materials, rapid hardening materials, setting time, x-ray diffraction.

Research goals: The research has been carried out in order to develop new hydroinsulating materials for protection and maintance of construction objects. The active part of the materials will deeply penetrate the capillary system of the construction objects where they can react. The insoluble compounds will clog up the capillaries and pores and objects would be permanently protected from water and moisture. In research of rapid setting and hardening cement materials, except for the development of new materials, the research will contribute to the better understanding of hydration process and mechanisms of rapid setting of HAC in the presentce of differentanions on the setting time will be investigated as well. The kinetics and mechanisms of hardening process will be studied and matematical description of process will be given. Also, the influence of pH of the media and relationship between the setting time and pH will be determined.

Other information about the project.


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Last update: 10/11/95
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