Рубрика: High-Performance Construction Materials

Testing of SCC Introduction The properties that differentiate SCC from conventional concrete are those of the fresh concrete. The required workability for casting concrete depends on the type of construction, selected placement and consolidation methods, complexity of the formwork, and structural design details that affect the degree of congestion of the reinforcement. Table 2.3 Test properties and […]

Constituents and mixing proportions

The basic ingredients used to make SCC, such as cement, supplementary cementing materials, aggregates, chemical admixtures, are the same as those used in making conventional concrete. However, SCC mix constituents and their proportions are to be carefully selected so as to achieve a concrete with lower rheological shear stress and viscosity that would remain homogenous […]

Self-Consolidating Concrete

2.4.1 Introduction Self-consolidating concrete (SCC) is highly flowable, nonsegregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation. It has also been described as self-compacting concrete, self-placing concrete, and self-leveling concrete, which are subsets of SCC [135]. SCC was initially developed to ensure proper consolidation in applications […]

Corrosion in Chloride Solutions

It is well known that chlorides cause the corrosion of steels in concrete, while high concentration of calcium chloride also deteriorates concrete very quickly. Hydrated monochloroaluminate (C3A. CaCl2.xH2O) is always identified in calcium chloride attacked cement concrete. However, it cannot be regarded as the main cause of deterioration because this salt forms in cement pastes, […]

Alkali-aggregate reaction

The expansion and cracking of concrete caused by alkali-aggregate reaction was first studied in the early 1930’s. There are two types of alkali-aggregate reaction, which can lead to cracking of concrete: (a) alkali-silica reaction (ASR) and (b) alkali-carbonate reaction (ACR). ASC is a chemical reaction within concrete between specific siliceous constituents, which sometimes occur in […]