Environmental Aspects of Resource-Saving Cement Technology

Abstract

The article outlines the main problems that the cement industry causes to the environment. Authors propose technological solutions aimed at resource-saving in cement production and environmental protection. The research is devoted to low-energy cement obtained on the basis of waste from processing skarn-magnetite ores. The characteristics of the composition and properties of the technogenic material are given. The authors have justified the feasibility of using skarn-magnetite ore enrichment waste as a part of a cement raw material mixture. The possibility of changing the composition of cement by reducing the energy-intensive alite phase is demonstrated. Technological and heat engineering calculations confirming the reduction of natural mineral raw materials and fuel costs in the production of cement were carried out. The processes of hydration of the developed cements have been investigated. A method for accelerating the hardening of low-base cements due to mechanical activation, the introduction of mineral additives and a modifier is proposed. The research revealed construction and technological advantages of the developed cements, which exhibit increased resistance during operation in an aggressive environment. Physical and mechanical tests of concretes made of low-base cement were carried out. The possibility of reducing the temperature during the heat treatment of concrete is proved. Physical and mechanical tests of concretes made of low-base cement were carried out. The paper presents environmental benefits of the developed cement technology.

Case Study of EPS Aggregate Insulation Material Used in Construction Sites

“…Portland cement, can improve mechanical performance, while the density and thermal conductivity can increase and unacceptable shrinkage occurs with resulting macrocracks. The extensive use of Portland cement increases damage to the environment, while sustainability could be reached by the effective recycling practice of EPS [16], [17]. To avoid such uncertainty, commercial binders are produced and available as dry mixtures in sacks.…”

Experimental Study on the Mechanical Properties of Green Lightweight Cement Composite Modified by Nano Additives

“…However, along with the production of cementitious materials, concerns have been growing with the large consumption of energy and adverse environmental impacts, especially those connected with global warming and climate change. According to the reports [2]- [5], around 7 % of the world's emissions of artificial carbon oxide (CO2) are generated for the manufacture of Portland cement (PC); 67 to 70 % of energy consumption during concrete production is ascribed to PC and almost 14 % of the world's total energy from the industrial sector is consumed. To produce one ton of PC, nearly 0.82 to 1.0 metric tons of CO2 is emitted into the surroundings [6].…”