Challenges and opportunities of utilizing municipal solid waste as alternative building materials for sustainable development goals: A review

Research on different types of fiber reinforced concrete in recent years: An overview

Siliceous fly ash (FA) is the main additive to currently produced concretes. The utilization of this industrial waste carries an evident pro-ecological factor. In addition, such actions have a positive effect on the structure and mechanical parameters of mature concrete. Unfortunately, the problem of using FA as a Portland cement replacement is that it significantly reduces the performance of concretes in the early stages of their curing. This limits the possibility of using this type of concrete, e.g., in prefabrication, where it is required to obtain high-strength composites after short periods of curing. In order to minimize these negative effects, this research was undertaken to increase the early strength of concretes with FA through the application of a specifically formulated chemical nano-admixture (NA) in the form of seeds of the C-S-H phase. The NA was used to accelerate the strength growth in concretes. Therefore, this paper presents results of tests of modified concretes both with the addition of FA and with innovative NA. The analyses were carried out based on the results of the macroscopic and microstructural tests in five time periods, i.e., after 4, 8, 12, 24 and 72 h. The results of tests carried out with the use of NA clearly indicate the possibility of using FA in a wide range of management areas in sustainable concrete prefabrication.

Application of the C-S-H Phase Nucleating Agents to Improve the Performance of Sustainable Concrete Composites Containing Fly Ash for Use in the Precast Concrete Industry.

Investigation of microstructural damage in air-entrained recycled concrete under a freeze–thaw environment

Estimating the compressive strength of eco-friendly concrete incorporating recycled coarse aggregate using neuro-fuzzy approach

Effect of fly ash on mechanical properties and microstructure of cellulose fiber-reinforced concrete under sulfate dry–wet cycle attack

This work studied the compressive behavior and microstructure of cement-based recycled concrete (CE-RC), low-volume fly ash (FA) recycled concrete (LFA-RC), and high-volume FA recycled concrete (HF...

Compressive behavior and microstructural analysis of low and high volume fly ash concrete containing recycled concrete aggregate

To evaluate the performance of green-concrete road material in cold regions of northern China, concrete was prepared with 0%, 50%, and 100% air-entrained coarse recycled concrete aggregate (CRCA) to replace coarse natural aggregate (CNA). Low-volume and high-volume fly ash (FA; LFA- and HFA-) were also used to replace some cement. The mass loss, residual compressive strength, relative dynamic modulus of elasticity (RDME), and concrete microstructure were measured after being subjected to certain freeze–thaw (F–T) cycles. Results indicated that an appropriate amount of CRCA can help optimize the pore distribution of concrete, and improved the frost resistance of concrete. FA can improve the workability of concrete and enhance the bonding performance of aggregate–mortar interfacial transition zone. Additionally, the LFA-based concrete showed excellent improvement in the resistance to F–T environment. However, the HFA had an adverse effect on strength of pore structure and weakened frost resistance of concrete. When the CRCA replacement was 50% and the FA content was 20%, the RDME and residual compressive strength of the concrete showed the least reduction after F–T test.

Performance evaluation of green-concrete pavement material containing selected C&D waste and FA in cold regions

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Papers

Effect of fly ash on mechanical properties and microstructure of cellulose fiber-reinforced concrete under sulfate dry–wet cycle attack

Compressive behavior and microstructural analysis of low and high volume fly ash concrete containing recycled concrete aggregate

Performance evaluation of green-concrete pavement material containing selected C&D waste and FA in cold regions