Concrete Technology - Civil Lead

Prestressed Concrete – Definition | Method | Advantages | Disadvantages

What is Prestressed Concrete? Concrete can withstand a great amount of compressive stress but it has a very low tensile strength. Because of low tensile strength, concrete gets cracks when subjected to maximum load. As the name indicates prestressed concrete is a form of concrete in which internal stresses are introduced before its application so that …

Nominal Mix Concrete Vs Design Mix Concrete

by Civil Lead

Concrete Concrete is made up of mixing cement, sand, aggregate, admixtures and water. The strength, workability and durability of concrete depend on mixing proportions of its ingredients. Normally there are two types of methods which are used for proportioning different ingredients Nominal Mix Design Mix Selection of type of concrete mix depends on the requirement …

Specific gravity of Cement – Definition | Importance | Test Procedure

by Civil Lead

Specific Gravity of Cement As we know that the specific gravity of ordinary portland cement is between 3.1 to 3.15 g/cc and for portland pozzolana cement and portland blast furnace cement it is near to 2.90 ( As per Portland Cement Association -PCA 1998) What is specific gravity? The specific gravity of any substance may …

Soundness Test of Cement By Le-Chatelier Apparatus

by Civil Lead

Soundness Test of Cement Certain cement shows expansion after setting and causes disruption of hardened mass. The testing of the soundness of cement is to ensure that the cement does not show any appreciable expansion after setting. Unsoundness of cement is due to excess of lime, magnesia and proportion of sulphate. There is Le-Chatelier test to …

14 Types of Cement and Their Uses

by Civil Lead

Types of Cement Cement is a building material which is used in the construction industry. Cement sets well underwater and hardens quickly and attain strength. Cement contains hydraulic properties to great extent and acquires more strength on the setting. In actual cement is a Calcareous substance which is used in mortar or concrete for construction. …

What is Curing of Concrete?- Purpose, Importance, Curing Period & Methods

by Civil Lead

What is Curing of Concrete? Curing is the process of maintaining the moisture of freshly placed concrete to complete the hydration process and to ensure proper hardening, attaining desirable strength and durability. Curing keeps the concrete surface moist and reduces the shrinkage. Curing should be started at the earliest. It has to be started when …

Difference Between 33, 43 and 53 Grade Cement

by Civil Lead

Ordinary Portland cement has 3 grades that are 33-grade, 43-grade, 53-grade. As per the Bureau of Indian Standard, these grades are differentiated by their compressive strengths and these strengths are expressed in megapascal (Mpa) that is N/mm2. Compressive strength is a ratio of load per unit area. The load is calculated in newton (N) and the …