Cover to reinforced concrete is the minimum thickness of concrete provided over the reinforcement steel, measured from the exposed concrete surface to the closest reinforced steel surface. Concrete is needed to cover and protect steel reinforcement within its body. The concrete cover is often subjected to impact, wear, and access…
Different Types of Cover Block/Spacers at Construction Site
Cover blocks or spacers are divided based on the materials utilized in their manufacturing process. These are given below for various spacers: Metal Spacers Plastic Spacers Concrete Block Spacers Wood Spacers Metal Spacers Metal spacers are commonly used and are interchangeable with slab bar supports. They provide good anchorage or…
Methods of Testing Self Compacting Concrete Workability
There are three basic properties of self-compacting concrete (SCC) namely flowability, passing ability (free from blocking due to presence of reinforcement), and resistance to segregation (stability/homogeneity). Therefore, it is very essential to carry out field trials or mock trials to assess these attributes. Unfortunately, so far not a single test…
What is Plastic Cracking of Concrete? Its Occurrence, Causes, and Preventive Measures
Plastic cracking of concrete occurs when the concrete has just laid and finished is exposed to warm drying wind, and then develops cracking over the surface of the fresh concrete. The main causes of cracking can be attributable to the following. Poor workmanship and negligence. Defects and errors in construction…
What Causes Cracks in Concrete Basement Floors?
Cracks in the concrete basement floor can be a reason for panic for homeowners. Most concrete basement floor cracks are normal and do not need to be repaired. However, some cracks in the concrete basement floor can let in water, moisture, and dangerous soil gasses. Is It Normal For Concrete…
Types of Concrete Mixers
What is Concrete Mixer? Concrete mixers are machines that mix cement, aggregates, and water together to produce the concrete mechanically. A good concrete mixture shouldn’t only uniformly mix the concrete ingredients, but should also discharge the concrete mix without disturbing it’s uniformly. This can be judge by the uniform consistency…
Methods for Mixing of Concrete and Their Procedure
Mixing of concrete is determined as the “complete blending of the concrete materials or ingredients which are required for the production of a homogeneous concrete”. Mixing can differ from hand to machine mixing of concrete mix, with machine mixing being the most common. However, no successful mixture can be achieved…
Methods of Batching of Concrete
Batching is the process of measuring materials or ingredients to prepare concrete mix or mortar mix is known as batching of concrete or mortar. The batching of concrete ingredients or mortar material is the same as preparations of a dish in cookery according to a recipe wherein different ingredients depending…
What is Alccofine? Its Application and Advantages
Alccofine is a new generation, micro-fine material of particle size much finer than other hydraulic materials like cement, fly ash, ground granulated blast furnace slag (GGBS), silica fume, etc. being manufactured in India. Alccofine has special attributes to enhance the performance of concrete in the fresh stage & hardened stage…
What is Drying Shrinkage? Its Occurrence, Causes, and Preventive Measures
Drying shrinkage occurs when water begins evaporating from the exposed surface and the moisture differential along the depth of the slab causes strain which induces tensile stresses. The driving force for drying shrinkage is the evaporation of water from the hydrated cement paste which is exposed to air with a…
