After many tests, it seems that ANY combination of hard aggregates in my castings produces holes here and there which I try to prevent as much as possible.
what is the best mix ratio from cement/sand ( no hard aggregates) for thin castings such as bowls and planters?
I know that...
On one of my project's structural member, the Site Engineer In charge cut the rebar with gas torch cutter.
The Quality manager immediately ordered the work to be stopped and issued NCR.
What is the reason that rebars need to be cut with a rebar cutting machine and not gas torch cutter ?
How GGBS is Made inside Steel manufacturing Factory
On our planet, Iron is not found in pure state, we call it as ore. Iron Ores are often oxidized and mixed with Silicates (sand). During manufacturing of steel these ores are heated above 1600 degree centigrade in the furnace, there are many...
Concrete is the most abundant man-made material in the world; it is the backbone of modern society. But cement, the critical ingredient that gives concrete its strength, is responsible for up to 7% of the world's carbon dioxide emissions.
CarbonCure manufactures a bolt-on technology that...
10 Precautions to be taken during placing of Concrete
Following precautions should be taken during placing of concrete.
1. The formwork or the surface which is to receive the fresh concrete should be properly cleaned, prepared and well watered.
2. It is desirable to deposit concrete as...
The Compressive Strength of Cubic Concrete Specimens
Compressive strength of concrete: Out of many test applied to the concrete, this is the utmost important which gives an idea about all the characteristics of concrete. By this single test one judge that whether Concreting has been done...
Slump Test for Concrete
Ref : IS 1199
Purpose : To find out the workability of fresh concrete
Salient features of apparatus:
Top diameter - 100 mm
Bottom diameter - 200 mm
Height - 300 mm
Thickness - 1.6 mm
Diameter - 16 mm
Length - 600 mm...
Compressive strength test for concrete
Ref : IS 516
Purpose : To find out the compressive strength of concrete
Salient features of apparatus:
Compression testing machine
Remove the cubes from water after curing period
Concrete is a composite material that essentially consists of a binding medium embedded with Fine-Aggregate (typically sand) and Coarse Aggregate (typically gravel) with or without chemical and mineral admixture.
Concrete is neither as strong nor as tough as steel, so why is it the most widely...
Special Types of concrete you can produce at your construction project
When it comes to a concrete, all might thought its just a mixture of cement, sand and aggregates. there is lot in the concrete that we can do, addition in ingredients and material properties gives concrete a different...
Concrete is a material which is a basic for any project.
I will be helping you out by sharing my experience with all of you (You too can help me in learning new tech's in this field by sharing your experience through doing post on forum).
After reading all posts you will be in position to say...
Standard deviation is a measure of the variation of concrete strength of a set of data from its mean.
If the strength results are away from the mean, the deviation will be higher and vice a versa.
Its a statistical measure for Re-designing the mix base on results achieved.
In initial mix...
This is a common question, asked by many.
We all have seen, Almost everyone working at project site, do insist to keep on curing by pouring water, wrapping concrete surface with hessian cloths etc.
Do the poured water really increase the strength of concrete?
What if, i dont cure concrete...
Concrete mix designing is a vital part of any construction activity.
Why we do mix design when proportions for material are listed in IS codes for various grades?
The listed mixes have more cement content than required and have fix properties like workability, retention time etc.
In order to...
Specification for concrete work of high rise building
Concrete shall be transported and placed by approved methods that ensure segregation or loss of material will not occur.
Concrete drop during vertical placement shall not exceed 2.5m. For heights greater than 2.5m, the Contractor shall pour...
Rebound hammer test specifications are given in IS 13311 part 2 1992.
Every one know about it and knows how to do rebound hammer test, many had gone through the IS codes, posts on blogs and some interview questions.
One of my friend ask me, how i should do the rebound hammer test, as per IS...
Properties of Cement Concrete
Properties of concrete are influenced by many factors mainly due to mix proportion of cement, sand, aggregates and water. Ratio of these materials control the various concrete properties which are discussed below.
Properties of Concrete are
Grades (M20, M25, M30...
If You really Ask me, then let me tell you.
The number of cement bags per cum of conrete depends on Your Concrete Mix Design.
Mix Designing is done to achieve a specific characteristic of Concrete like compressive strength, durability etc.
Characteristic of concrete depends on design of...
Hello to All,
I came across the new inventions which are going on in construction Industry.
Creating a concrete which repairs itself.
Concrete is porous material (porosity depends on mix design), so if not protected will start degrading over period of time.
To protect the concrete we...