WHAT IS BLEEDING IN CONCRETE AND HOW IT AFFECTS CONCRETE?

Bleeding in Concrete

Bleeding of Concrete Bleeding is one form of segregation, where water comes out to the surface of the concrete, being lowest specific gravity among all the ingredients of concrete. Bleeding can be easily identified in the field by the appearance of a thin layer of water in the top surface of freshly mixed concrete. Effects … Read more

HOW TO AVOID SEGREGATION OF CONCRETE?

Avoiding Segregation in Concrete

The danger caused by segregation is difficult to repair and very costly. Therefore necessary precautions should be taken to avoid segregation. Precautions to Take The concrete mix should be properly designed with optimum quantity of water to make a cohesive mix. Such concrete will not exhibit any tendency for segregation. Field quality control must be … Read more

WHAT ARE THE EFFECTS ON CONCRETE DUE TO SEGREGATION?

Segregation in Concrete

Following are the effects on concrete due to segregation. Effects on Concrete A segregated concrete is very weak in strength Due to segregation after placing, the concrete in the lower part of a pour of any significant depth can be stronger than that in the upper part. Segregated concrete does not give a homogeneous mass … Read more

WHAT CAUSES SEGREGATION OF CONCRETE IN FIELD?

Segregation of Concrete

Segregation usually implies separation of: (a) coarse aggregate from fine aggregate, (b) paste from coarse aggregate, or water from the mix and the ingredients of the fresh concrete no longer remain uniformly distributed. The points given below are the primary causes of segregation of concrete in field. Causes of Segregation on Site Poorly graded aggregate … Read more

WHAT IS SEGREGATION OF CONCRETE AND WHY IT HAPPENS?

Theory Behind Segregation of Concrete

What is Segregation? Wordweb dictionary defines the term “segregation” as – Separation or isolation of one thing from another and place in a group apart from others. In concrete technology, segregation can be of two types. Firstly the coarse aggregate may separate from the main mass of concrete in its plastic state. Secondly, the grout … Read more

WHAT ARE THE FACTORS AFFECTING WORKABILITY OF CONCRETE?

Factors Affecting Workability

Factors Affecting Workability of Concrete A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Workability is a property of freshly mixed concrete, and a concrete is a mixture of cement, aggregate, water & admixture. Due to this all the properties of concrete, whether in fresh … Read more

WHAT IS WORKABILITY OF CONCRETE & WHAT IS ITS IMPORTANCE AND SIGNIFICANCE?

Workability of Concrete

Before knowing the term workability let us look at some of the definitions given by scientists and researchers. Definitions of Workability of Concrete According to Granville “it is that property of the concrete which determines the amount of useful internal work necessary to produce full compaction.” Powers defined it as “that property of plastic concrete … Read more