Self-healing cementitious materials containing a microencapsulated healing agent are appealing due to their great application potential in improving the serviceability and durability of concrete structures. In this study, poly(phenol-formaldehyde) (PF) microcapsules that aim to provide a self-healing function for cementitious materials were prepared by an in situ polymerization reaction. Size g...

Pavement damage occurs in cold-region concrete exposed to high concentrations of calcium chloride (CaCl2). The is caused by a combination conventional freeze-thaw and the formation deleterious phase known as oxychloride from reaction between CaCl2 hydroxide concrete. Much research has focused on mitigation cement pastes, but not due oxychloride. In this study, synergistic roles air supplementar...

Cementitious composite is one of the most widely used construction materials in the world because its abundant resources, strong adaptability and mature production process [1]. Despite cementitious matrices present good compression strength, they are brittle and usually break when suffer some strain caused by tensile effort. Aiming to overpass this problem some fibers can be used as reinforceme...

It is well known that supplementary cementitious materials (SCMs) have obvious effects on the properties of concrete. In order to understand relationship between and ultrahigh strength concrete (UHSC), compositions UHSC were designed by simple-centroid design method. The investigated. was found incorporation silica fume (SF) improved flowability UHSC, but it decreased time acceleration period, ...

This paper presents an approach to predicting the intrinsic self-healing in concrete using a hybrid genetic algorithm-artificial neural network (GA-ANN). A genetic algorithm was implemented in the network as a stochastic optimizing tool for the initial optimal weights and biases. This approach can assist the network in achieving a global optimum and avoid the possibility of the network getting ...

The causes and mechanisms of corrosion of reinforcing bars in concrete are described in terms of the practical issues as well as the electrochemistry. The parameters affecting corrosion are (i) the ingress of aggressive species, such as chlorides, which break down the protective film on the reinforcing bar and (ii) the amount of those species necessary to do so. The former is largely controlled...

This study focuses on the effect of the amount of silica fume addition and volume fraction of steel fiber on the engineering properties of cementitious materials. Test variables include dosage of silica fume (5% and 10%), water/cement ratio (0.35 and 0.55) and steel fiber dosage (0.5%, 1.0% and 2.0%). The experimental results included: compressive strength, direct tensile strength, splitting te...

The increasing demand on the resistance of civil engineering structures under accidental loadings has led to an evolution in research, shifting the focus from a structural design level towards solutions on material level. The development of new high performance cementitious composites has opened new possibilities concerning building materials. However, the available data on the dynamical behavi...