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How to add Nanosilica to concrete?
desvl
Colloidal Nanosilica is supplied in liquid form so it should be added to concrete during mixing as any liquid would be added ideally through a dispenser but can be measured out and added with a bucket by simply pouring it into the mix and ensuring it is thoroughly mixed .
Colloidal Nanosilica is supplied in liquid form so it should be added to concrete during mixing as any liquid would be added ideally through a dispenser but can be measured out and added with a bucket by simply pouring it into the mix and ensuring it is thoroughly mixed .
See lessWhy is the risk of efflorescence formation in cement-based materials high in coastal areas?
aviratdhodare
Efflorescence is layer of salts left behind by an evaporating sol'n of salts on masonry surfaces. It is quite usual on plastered walls, ceilings, concrete, cement plastering, and painted walls. Why and how does it occur? It occurs when the dissolved salts in cement, sand, and water in constructionsRead more
Efflorescence is layer of salts left behind by an evaporating sol’n of salts on masonry surfaces. It is quite usual on plastered walls, ceilings, concrete, cement plastering, and painted walls.
Why and how does it occur? It occurs when the dissolved salts in cement, sand, and water in constructions are brought to the surface through leaching. In the second stage, the water evaporates to the atmosphere leaving powdery crystalline salts on the surface.
These salts could be present in cement due to breakdown and aging.
The sand used is of inferior quality containing salts. Though river sands are used in construction, excessive quarrying could lead to poorer quality. Instead of using sand from river or lake beds, adulteration with seashore sand could be the cause.
Water used for curing is impure with dissolved salts in it. Saline water with dissolved salts could turn out to be the culprit.
At the initial stages, the formation of a salt layer on the surface could go unnoticed. However repetitive cycles of evaporation and leaching steadily build-up the salt and the seriousness of the problem is visual. In some cases, growth in fungi could be noticed accompanied by efflorescence leading to unhygienic spaces.
Let us turn our attention to the question of the acceleration of corrosion near the seashores. Galvanic corrosion is the type of corrosion noticed near seashores. Salt in the form of aerosols reaches places located 30 KM inshore.
Salt, water, and the wind are the players that accelerate the corrosion process. Near the seashores, all these prime ingredients are readily available.
See lessWhat are the additives or aggregates needed for 3D printed Concrete?
aviratdhodare
Any material will give you a finished form if it’s the right consistency and is deposited using an effective method. Guessing, I would say industrial grout with sand and latex additive. The project budget, scale and environment will dictate the material formulas and extruder specifications, which arRead more
Any material will give you a finished form if it’s the right consistency and is deposited using an effective method. Guessing, I would say industrial grout with sand and latex additive.
The project budget, scale and environment will dictate the material formulas and extruder specifications, which are probably kept secret by those that are already in the business.
Probably a good business to get into if you know the required science and engineerin
See lesswhat precautions should be taken during the cube test?
aviratdhodare
Precautions for use of concrete compressive testing machine: 1. The operation should be carefully checked and carefully operated according to the steps before starting and operation, and illegal operation is strictly prohibited.2. When operating, it is strictly forbidden to exceed the marking line oRead more
Precautions for use of concrete compressive testing machine:
1. The operation should be carefully checked and carefully operated according to the steps before starting and operation, and illegal operation is strictly prohibited.
See less2. When operating, it is strictly forbidden to exceed the marking line on the vertical column (50mm).
3. It is strictly forbidden to start the motor at high pressure to avoid damaging the electrical appliances.
4. Always check whether the hydraulic oil of the tank is sufficient, and the oil standard shall prevail.
5. Replace the hydraulic oil and clean the tank every half year when using frequently.
The problems faced by a civil engineer during construction?
nikeetasharma
There are many types of problems which are faced by civil engineers during construction, they are:- 1. Environmental problem 2. Climatic condition 3. Geographical topography 4. Health problem 5. Safety problem 6. Manpower problem
There are many types of problems which are faced by civil engineers during construction, they are:-
1. Environmental problem
See less2. Climatic condition
3. Geographical topography
4. Health problem
5. Safety problem
6. Manpower problem
How to adjust mix proportions if we have to work with wet sand?
AdityaBhandakkar
Hi, The maximum amount of water to cement ratio should be determined by the authority having jurisdiction based on the exposure conditions. The targeted water to cement ratio should be selected from the data available on the materials which actually used. but if such data is not available then waterRead more
Hi,
The maximum amount of water to cement ratio should be determined by the authority having jurisdiction based on the exposure conditions. The targeted water to cement ratio should be selected from the data available on the materials which actually used.
but if such data is not available then water to cement the should be selected from IS mix proportion table or ACI Table 6.9.4-a.
See lesswhat is the need to design a mix in concrere
AdityaBhandakkar
Hi, mix producers always work to find the perfect proportions of ingredients to optimize the concrete mixes to give their great concrete strength, durability, enough workability and various desirable properties. It’s very important to optimize the concrete to confirm the lowest expense while maintaiRead more
Hi,
mix producers always work to find the perfect proportions of ingredients to optimize the concrete mixes to give their great concrete strength, durability, enough workability and various desirable properties. It’s very important to optimize the concrete to confirm the lowest expense while maintaining the highest strength of your mix. as every mixing of the concrete mix involves adjustments to the ingredients, making the process very difficult and ineffective.
In this way, mix design is very important to make a project economical, strong and durable.
See lessWhy water is not used to find specific gravity of cement?
nikeetasharma
Specific gravity of any material is defined as the ratio of weight of a volume of a material to the weight of same volume of water at particular temperature. So in this test the quantities are very important. Water is not used in testing of specific gravity of cement because cement reacts with waterRead more
Specific gravity of any material is defined as the ratio of weight of a volume of a material to the weight of same volume of water at particular temperature. So in this test the quantities are very important. Water is not used in testing of specific gravity of cement because cement reacts with water and form compounds. Thus , the quantities measured prior to the commencement of test will not be same after the test. Therefore kerosene which is inert (non-reactive) with cement is used. We should observe here that we calculate the specific gravity of cement with respect to kerosene and convert it with respect to water by using 0.79 (specific gravity of kerosene) in the formula of the same.
See less