Guniting or shortcrete is mortar or very thin concrete deposited by jetting it with high velocity on to a prepared surface. Shortcrete has wide application in different construction, such as thin over head vertical or horizontal surface. Types of Guniting or shortcreting Dry Mix Process Wet Mix process Dry mix process :- The mixture of …
These test methods cover procedures for assessing the adhesion of relatively ductile coating films to metallic substrates by applying and removing pressure-sensitive tape over cuts made in the film. Terminology Adhesion—the molecular attraction and mechanical bonds between a coating and its substrate. Batch—as it pertains to tape, a unique production run during manufacturing. Blemish, —an …
ASTM D3359 :- Standard Test Methods for Rating Adhesion by Tape Test Read More »
Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser This test method covers the determination of the resistance of organic coatings to abrasion produced by the Taber Abraser on coatings applied to a plane, rigid surface, such as a metal panel. Summary of Test Method The organic coating is applied at …
ASTM D 4060 :- Standard Test Method for Abrasion Resistance of Organic Coatings Read More »
This test method covers a procedure for evaluating the pull-off strength (commonly referred to as adhesion) of a coating system from metal substrates. Pull-off strength of coatings from concrete is described in Test Method D7234. The test determines either the greatest perpendicular force (in tension) that a surface area can bear before a plug of …
ASTM D 4541 :- Standard Test Method for Pull-Off Strength of Coatings Read More »
This European Standard specifies a method for the determination of the tensile adhesion strength of cementitious ceramic tile adhesives. • Test conditions :- (23 ± 2) °C and (50 ± 5) % relative humidity • Test materials :- Condition all test materials to be tested for at least 24 h under standard conditions. Type of …
BS EN 1348 : Determination of tensile adhesion strength for Cementitious adhesives Read More »
Standard Test Methods for Sampling and Testing Modified Bituminous Sheet Material These test methods cover procedures for sampling and testing prefabricated, reinforced, polymer-modified bituminous sheet materials designed for single- or multiple-ply application in roofing and waterproofing membranes. Significance and Use These test methods are used for sampling and testing modified bitumen sheet materials. Property requirements, …
ASTM D 5147 : Sampling and Testing Modified Bituminous Sheet Material Read More »
Screeding :- It is a mixture of cement, fine sand and water with some admixture.The purpose of screed is to level the undulated surface. Types of screed Bonded screed Unbonded screed Floating screed 1. Bonded screed :- This type of screed is bonded onto the substrate by applying bonding agent or slurry bonding to the concrete …
Difference between Bonded screed ,unbonded screed and floating screed Read More »
Bore packing :- The process of fixing plumbing pipes by cutting core into the RCC slab or wall is called Bore packing. Procedure of Bore packing The inner side of the core cutting should be hacked and remove all the dust and loose particles from the surface. Epoxy bonding agent shall be applied over the hacked …
What is Bore packing & Procedure of Bore packing ? Read More »
Spalling of concrete When few parts of the concrete debond from the structure due to reinforcement rusting is called spalling of concrete. Reason of spalling of concrete :- Rusting Chemical attack Penetration of carbon dioxide in structure Chlorides attacks Decrease in ph value of concrete Freeze thaw Polluted environment Stages involves in spalling of concrete …
What is spalling of concrete : Its causes and repair Read More »
Hacking :- Hacking is the process of creating indents marks on the concrete surface of controlled size , to help good bonding for the mortar coming in contact with it. Why hacking is important Hacking create a bonding bridge between surface and upcoming mortar. It help to increase tensile adhesion strength of the mortar. Hacking …
