Your blog category
Color variation in Concrete Cause Variation in mix proportion Curing condition Materials Characteristics of form face vibration release agent leakage of water from formwork Prevention Ensure uniformity of all relevant factor Prevent leakage from formwork Remedy Apply surface coating
Blow holes in form faces of concrete Cause Air and water are trapped against formwork. Inadequate compaction Unsuitable mix design unsuitable release agent Prevention Improve vibration change mix design use the appropriate release agent use absorbent formwork Remedy Fill with polymer modified fine mortar
Scope:- Specifies the method for determining the initial surface absorption of oven-dried specimens and of concrete that cannot be oven dried. Test for determining the initial surface absorption of concrete initial surface absorption The rate of flow of water into concrete per unit area after a stated interval from the start of the test and …
BS 1881-104 Part 104: Method for determination of Vebe time Read More »
Voids in Concrete Cause Honeycombing Inadequate compaction Grout loss Preventions Improve compaction Reduce maximum size of aggregates prevent leakage of grout Remedy Cutout and make Good Inject resin
These test methods cover the determination of the various stages and rates of film formation in the drying or curing of organic coatings under laboratory-controlled conditions of air temperature, (low, ambient, and/or elevated) and/or humidity. Procedures for assessing drying under prevailing conditions of temperature and humidity in the shop and field are also described. Substrate, …
ASTM D1640/D1640M :- Drying, Curing, or Film Formation of Organic Coatings Read More »
Pencil hardness:-Resistance of the surface of a paint film to marking, or the formation of some other defect, as a result of the action of a pencil, with a lead of specified dimensions, shape, and hardness, which is pushed across the surface Principle:- A pencil lead with a defined geometry is pushed over the paint …
ISO 15184 : Determination of film hardness by pencil test Read More »
Adhesive is hygroscopic in nature and therefore can easily absorb moisture from the air hence it requires protection from dampness and humidity as it can lose strength and form lumps. In most construction projects godowns are constructed at the site for storage of a few days requirements of Adhesive. The wall must be plastered and …
This part of BS 8204 gives recommendations for constituent materials, design, work on-site, inspection, and testing of concrete bases that are to receive in situ wearing screeds of the following types: a) concrete (see BS 8204-2); b) polymer modified cement (see BS 8204-3); c) terrazzo (see BS 8204-4); d) mastic asphalt (see BS 8204-5); e) …
The success of a waterproofing application depends on, among other things, the type, smoothness, and cleanliness of the concrete surface being coated. Adhesion Inhibitors Form release agents, such as oil, grease, wax, and silicones, will transfer from the forms to the surface of the concrete during casting. These will cause poor adhesion of waterproofing systems. …
Preparation of Concrete Surfaces before Waterproofing System Read More »
Control Joints:- Control Joints are used to bear the movement of concrete when concrete shrinks during curing. A joint of 3 to 5 mm is generally cut with the help of a diamond concrete saw blade called Saw cut. The depth of the cut must be 1/4 times the full depth of the slab. …
What is the difference between Control and Expansion Joint ? Read More »
