Properties of lightweight dry masonry mixtures for winter conditions

Vyacheslav Semenov,D Rudoy,V Murgul

doi:10.1051/e3sconf/201913503026

Abstract

The construction of building envelopes using effective small-piece elements requires the use of lightweight masonry mortars, obtained, as a rule, from dry mixtures. One of the most effective ways to obtain such mortars is the introduction of hollow ceramic microspheres into their composition as a lightweight filler. For the climatic conditions of the Russian Federation, it is relevant to use dry masonry mixtures in the winter version, which gain strength at negative temperatures. The main purpose of this work was the development of optimal compositions of modified dry masonry mixes with hollow ceramic microspheres and antifreeze additives for use in winter conditions. Determination of the main properties of dry mixes and masonry mortars was carried out according to standard methods. X-ray diffraction and scanning electron microscopy were used to research of the microstructure and phase composition of the materials. As a result of this research, the compositions of the lightweight dry masonry mixtures for winter conditions were developed. The main properties of the mortar mixtures and mortars were determined and structure and composition of new phases of cement stone were studied as well.

Highlights

Housing construction, including low-rise construction, is one of the priorities of the construction industry, secured by a series of national projects and programs
A superplasticizer PERAMIN SMF 10, an air-entraining additive (AEA) ASCO 93 and a redispersible polymer powder (RPP) Vinnapas 8034 were used as the modifiers of masonry mortar structure
In case if it is unacceptable to increase the average density of the mortar, it is advisable to use the sodium formate or the complex “sodium nitrite + sodium sulfate” as antifreeze additive

Summary

Introduction

Housing construction, including low-rise construction, is one of the priorities of the construction industry, secured by a series of national projects and programs. The most applicable wall systems include multilayer systems using small-piece elements - blocks of cellular concrete, lightweight concrete with porous aggregates, effective ceramic elements, etc. These systems can be created with or without an additional layer of effective thermal insulation. To ensure the thermal homogeneity of such structures, lightweight masonry mortars (dry mixes) are used, whose properties – medium density, thermal conductivity, strength should be in accordance with the basic material of the wall (Table 1) [1,2].

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Conclusion