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.

Rocks are continuously affected by dry–wet cycles, which leads to intensified weathering and deterioration of the mechanical properties and often triggers engineering disasters. This study analysed the changes in the mechanical properties and microstructure of sandstone under dry–wet cycles. Based on the box dimension theory and the associated dimensions, the fractal dimension and correlation dimension were developed through digital images and time-series parameters to analyse the microstructural features and acoustic emission (AE) in MATLAB. The degree of microstructure damage under different dry–wet cycles was determined, and the relationship between the microstructure characteristics, fracture development trend, fractal dimension, and correlation dimension was established. The uniaxial compressive strength , elastic modulus , p-wave velocity, and resistivity of the sandstone decayed in distinct stages as the number of dry–wet cycles increased. The degree of microstructure damage was observed to be directly proportional to the fractal dimension. The physical and mechanical properties of the sandstone exhibited a significant relationship with the fractal dimension; it could be used to quantitatively describe the parametric characteristics of the sandstone. The change law of AE energy is consistent with the damage process of sandstone. Based on the analysis of the correlation dimension and sandstone microscale failure, its variation characteristics could be used to quantitatively evaluate the trend of sandstone fracture development and microstructural characteristics . The research results provide a reference for further exploration of the deterioration mechanism and engineering application of the sandstone during dry–wet cycles. • Changes in p-wave velocity, resistivity, uniaxial compressive strength, and elastic modulus of the sandstone under dry-wet cycles are studied. • Fractal dimension is used to quantify the degree of microstructure damage. • Degree of microstructure damage was observed to be directly proportional to the fractal dimension. • Acoustic emission technology is used to study the damage characteristics of the sandstone under dry-wet cycles. • Complexity of sandstone failure can be described by correlation dimensions. 

Quantification and acoustic emission characteristics of sandstone damage evolution under dry–wet cycles

Effect of nano-reinforcing phase on the early hydration of cement paste: A review

Fracture properties of concrete exposed to different sulfate solutions under drying-wetting cycles

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

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