Материал: Russian Journal of Building Construction and Architecture

The least original aggregate phases are in composition № 3: the content of Ca3SiO5 drops by 1.66 times, the content of Ca2SiO4 α-Ca2SiO4 by 1.47 times, which indicates a more complete cement hydration. In the composition № 3 there is a 23 % increase in the content of the crystal phase compared to the composition № 2.

An increase in the compression strength limit of the investigated compositions particularly during the first days of hardening is due to that in the specific surface of the cement powder samples and a drop in the average size of the cement particles. In order to determine the nature of cement hydration of the investigated samples a test was conducted to identify the kinetics of heat emission of the cement paste by means of the thermal calorimetry method (Fig. 5).

Temperature, ° C

Length of hydration, hours

Fig. 5. Kinetics of heat emission of the cement paste.

Numbers of the compositions correspond to those in Table 1

Fig. 5 shows that hydromechanochemical cement activation increases the hydration temperature by 20––25 °С accompanied with a 4––5 hour shift of the temperature maximum to the left, which makes cement hydration more intense. As Relamix Т-2 is introduced, the hydration of the cement paste slows down in the first hours (composition № 2) accompanied by a 2 hour shift of the temperature maximum.

Conclusions

1.Hydromechanical activation of cement in pulsed rotary equipment with the superplasticizer Relamix T-2 causes a dramatiс increase in the compression strength limit of concrete particularly in the first days of hardening.

2.The specific surface of the cement samples and aggregate minerals obtained following hydromechanochemical activation increases by 29 % compared to the control composition,

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the average size decreases, the amount of cement particles and aggregate minerals sized less than 20 mkm increases by 1.34 times.

3.The frost resistance of heavy concrete obtained by means of hydromechanochemical activation of cement increases by a few steps (to grade F600), which is due to a 39 % decrease in the total porosity, a 74.8 % decrease in the proportion of the open capillary pores and a 53 % increase in the proportion of the closed pores. The sulfate resistance coefficient of the cement and sand solution increases by 40 %, which indicates an increase in the strength of a cement compostion obtained by means of the method including hydromechanochemical activation of cement.

4.The phase composition of the cement stone obtained following hydromechanochemical activation is characterized by a high content of the ettringite (Ca6Al2(SO4)3(OH)12∙26H2O) and a low content of the original phases of the Portland cement.

5.Obtaining rapid-hardening concrete by means of the method including hydromelchanochemical activation of cement in pulsed rotary equipment allows one to reduce resource and energy costs due to shorter hardening times in timbering of concrete foundations in monolith construction or shorter thermal treatment of concrete structures at ferroconcrete plants.

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DOI 10.25987/VSTU.2019.3.43.005

UDC 691.32

M. L. K. Khouadjia1,C. Belebchouche2, L. BensacI-Chibane3

CHARACTERIZATION OF RECOVERY FILLER FROM HOT-MIX ASPHALT PLANTS AND ITS EFFECT ON THE WORKABILITY AND COMPRESSIVE STRENGTH OF CONCRETE

University of Constantine 11, 2, 3

Constantine, Algeria

1D. Sc. in Civil Engineering. Assoc. Prof., tel. (213)559-333-376, e-mail: lyes.khouadjia@umc.edu.dz

2D. Sc. in Civil Engineering. Assoc. Prof., tel. (213)661-456-371, e-mail: belebchouche.cherif@gmail.com 3PhD in Civil Engineering. Assoc. Prof., tel. (213)550-323-867, e-mail: chibanelamria@gmail.com

Statement of the problem. The production of building materials in Algeria and the rest of the world is accompanied by the production of waste that can potentially pollute the environment. While there is an urgent need for recycling in developing countries, many waste products are not being recycled yet. Among these materials is recovery filler (RF), an abundant byproduct in the manufacturing of road bitumen mix. The principal objective of this study is to validate the use of recovery filler (RF) in ordinary concrete.

Results. The slump and compressive strength of concrete both before and after freeze-thaw cycles were examined. Recovery filler (RF) was scanned using scanning electron microscopy (SEM) to develop an advanced characterization of RF from HMA plants using two software packages: Aphelion Lab 4.4 and Astra 1.6.

Conclusions. The results showed that it is possible to obtain good workability and compressive strength when replacing cement with a 10% of recovery filler from hot-mix asphalt plants providing that superplasticizer is used.

Keywords: recovery filler, road bitumen mix, concrete slump, compressive strength, freeze-thaw cycles, Aphelion Lab 4.4, Astra 1.6.

Introduction. Currently, concrete is the most common material used in the construction industry. Due to the environmental and economic challenges that arise from its use, it is necessary to carry out research on the reuse and recycling of materials. Important types of waste and unused materials that have been used to improve the behavior and durability of concrete and asphalt concrete include dune and river sands, filler, fly ash, slag, metakaolin, pozzolan, silica fume and shungite [1––6].

© Khouadjia M. L. K.,Belebchouche C., BensacI-Chibane L., 2019

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