Influence of iron-containing substances on Properties of aerated concrete

Abstract

The results of the experiments in which the properties of the dispersed system, which consists of a complex pore former, which includes perhydrol and iron oxide, and the hydrophobic surface-active substance that was used, were investigated. as calcium oleate, in the presence of sodium hydroxide and aggregates that were used as unground waste from mining and processing plants. The ease of placement of the concrete mixture was determined on mixtures of different mobility. In the experiments, ground ferrous rocks were used as a filler, and uncrushed ferrous rocks were used as an aggregate. The analysis of the research results allowed us to conclude that the complex foaming agent performs the role of a plasticizing additive. Based on the results of these experiments, it can be concluded that the intensity of the change in the mobility of the concrete mixture depends on its storage conditions. The intensity of the change in the mobility of the concrete mixture decreases with the introduction of a complex pore former. Thus, the introduction of a complex pore former reduces the loss of mobility of the concrete mixture at plus temperature. Under the conditions of the experiment, the optimal content of the complex pore former for the compressive strength of concrete was 10...15% of the mass of cement, which was adopted in further studies. Mathematical processing of the results of these experiments established the mathematical modulus of concrete compressive strength depending on the amount of foaming agent. According to the results of the experiments, the following conclusion can be drawn: an increase in the content of the complex mineral-organic pore former by more than 10% of the mass of the "cement - mineral part of the complex pore former" system practically does not lead to a noticeable change in the density of porous concrete. Therefore, it is advisable to limit the content of the complex mineral-organic pore former to within (10...15) % of the mass of the "cement - mineral part of the complex pore former" system.