What Is Road Surface Marking? Road surface markings are any type of device or material applied to a road surface to convey official information, often done using road marking machines. They can also be used in other vehicle facilities such as marking parking spots or designating areas for specific uses. What Is Used To Mark […]
What Is Tar And Chip Paving? Tar and chip paving is a type of surface treatment for roads, driveways and other areas to create an attractive and durable surface. It involves laying down a layer of hot tar on the prepared foundation then covering it with aggregate chips. This type of pavement is more economical […]
What Is Reflection Cracking In Pavement? Reflection cracking in pavement is a type of cracking that occurs when an existing surface layer or asphalt overlay on the pavement fails. It is caused when the layer below has weakened, due to either poor construction practices or inadequate substructure support. Because of this failure, stress concentrations develop […]
What Is A Concrete Density A concrete density is a measure of the solid mass of a material, such as concrete. It identifies how much mass there is in a certain volume, and is most often expressed in either kilograms per cubic meter (kg/m3) or pounds per cubic foot (lb/ft3). Knowing the concrete density enables […]
What Is Capillary Porosity In Concrete? Capillary porosity in concrete is a measure of the water-carrying capacity of its pores. It relates to the ability of concrete to absorb and transport moisture, as well as to resist the effects of freeze/thaw cycles. This phenomenon is important because capillary porosity determines the capacity for water movement […]
What Is A Base Course In Road Construction? The base course in pavements is a layer of material located under the surface layer, which is made up of the wearing course and sometimes an additional binder course. It serves as the foundation for the surface layer and is placed directly on top of the subgrade […]
What Is Concrete Permeability? Concrete permeability is a measure of how easily water or other liquids can pass through the concrete. It is determined mainly by the amount and type of paste or cement and aggregate used, as well as the porosity of the hardened cement paste. Good concrete permeability requires good workmanship during placement, […]
What Is A Sulfate Attack In Concrete? Sulfate attack on concrete occurs when sulphate ions interact with the cement paste, causing chemical deterioration. This can happen when concrete is exposed to water-soluble Sulfate salts like calcium, magnesium, sodium, or potassium Sulfate. The strength and development of cement is primarily influenced by two silicate phases: tricalcium […]
What Is Chloride Ion Penetration In Concrete? Chloride ion penetration in concrete is the process of chloride ions (salt) entering into the concrete, which can lead to corrosion of embedded steel and other reinforcements in the structure. This happens when chloride ions combine with moisture, air, or carbon dioxide from the atmosphere, forming a solution […]
What Is Alkali-Silica Reaction In Concrete? Alkali-silica reaction (ASR) is an expansive chemical reaction occurring in concrete between alkalis present in the cement and silica present in the aggregates. This reaction results in a gel-like substance, referred to as “ASR gel”, which absorbs water from the environment, swells, and exerts pressure on both hardened and […]