Heat evolution due to cement hydration in foamed concrete

Abstract

Foamed concrete is nowadays considered an attractive building material as a result of flexible production technology and excellent target properties, along with economic benefits. Heat generated in foamed concrete during cement hydration is found to differ significantly from normal-weight concrete. Foamed concrete that is placed in a regular-shaped well-insulated mould experiences significant core temperature rises and, although several documents discussing the thermal effect in foamed concrete have been published, there is still a lack of information revealing the interrelations of foamed concrete parameters and their effect on temperature rise. Laboratory tests were carried out with foamed concrete of variable densities and volumes under semi-adiabatic curing conditions. The observed trends were used as the initial input for a mathematical model of temperature prediction in foamed concrete. The heat evolution process under real production conditions can be controlled by optimising the mix composition. If the thermal energy in foamed concrete is properly employed it can result in considerable improvement of the final product characteristics while production costs decrease.

The Use of Additives to Enhance Properties of Pre- Formed Foamed Concrete

“…With the possibility of producing a wide range of densities (400-1600) kg/m 3 and also of achieving a strength of at least 25 MPa, foamed concrete has the potential to fulfil these requirements and it is now widely used in the construction industry [4], [5]. Furthermore, with foamed concrete, sustainability can be enhanced because no coarse aggregate is required in its manufacturing and there is also the possibility of partially or fully replacing fine aggregate with recycled or secondary materials [6].…”

Influence of chemical additive and reduced initial temperature of structure formation and hardening on parameters of structural strength of cement composites

“…Энергия разрушения как параметр прочности привлекает внимание исследователей фундаментальностью, практической важностью, дает возможность разработать в рамках механики разрушения подходы, позволяющие технологам указать оптимальные пути создания конструкционных бетонов нового поколения и реализовать основную идею разработки композиционных строительных материалов, которая заключается в соединении высокой прочности материала с хорошей трещиностойкостью (вязкостью разрушения) [19][20][21].…”

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

“…Regarding these problems, Jones [11] stated that the heat evolution in foamed concrete is affected by a greater number of parameters than that in normal-weight concrete. Tarasov [15] studied the influence of the density and the volume of the castings and of fine aggregates on the temperature profiles in foamed concrete. However, the effect of hydration heat on the strength development of foamed concrete was not considered, and the experiments were carried out in the laboratory without considering external influencing factors.…”