Greening of Concrete Industry by Incorporating Gypsum-Based Industrial Wastes as Supplementary Cementitious Materials

Abstract

The paper presents some preliminary results on using a new supplementary Cementitious material based on industrial by-products most of them unrecyclable until recently. The opportunity for using such industrial unrecyclable wastes in construction industry has recently been recognized by researchers as having net benefits for the environment. This strategy has the potential to reduce costs, conserve energy and minimize waste. The concept very much fits into the era of sustainable development. In view of this fact, the effect of curing conditions on the self weight and strength characteristics of an eco-mortar is studied and preliminary encouraging results are presented. The eco-cement, in the form of anhydrous calcium sulphate, is set to replace the ordinary Portland cement in the mix proportion. It is made from industrial wastes and can be entirely recycled after its expiration date. The curing conditions consisted in air curing for 28 days or various time intervals for curing in water until the day of testing. The strength properties at the age of 28 days are investigated in terms of bending tensile strength and compressive strength. The obtained results show that the curing conditions play an important role both on the self weight and on the strength characteristics.

Evaluation of the Load Carrying Capacity of Short RC Columns Strengthened with a Novel Cementitious Material by Using FEA

“…The results were encouraging, especially since the presence of moisture during the curing period of time has significant effects on both strength and elastic properties of Cementitious materials [25,26]. The novel mineral binder proved to be effective in delivering high values for the mechanical properties even in the absence of curing moisture [24]. This is valuable information for cases when the absence of moisture during the curing period of time might be an issue.…”

“…10 Self weight as a function of curing Fig. 11 Variation of self weight for considered conditions [24] mix proportions [24] 348…”

“…Its properties, in conjunction with ordinary Portland cement, have been extensively studied in terms of strength and elastic characteristics [13]. Additionally, the effect of curing conditions was also examined [24] and it was concluded that in terms of the self weight a water curing period of 7 days or 14 days led to better values. That means lighter structures and better behavior under seismic excitations.…”