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What is the pH of concrete Quora

What is the pH of concrete Quora

What is the pH of concrete? - Quora

pH is a very necessary factor for estimation the quality of concrete. pH 7 indicates basic And =7 indictates neutral Concrete have a basic pH of about 13, the pH values at exposed surfaces soon fall as reactions occur between ...

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What is the great of concrete? - Quora

Concrete is a composite material composed of coarse aggregate bonded together with a fluid cement that hardens over time. Most concretes used are lime-based concretes such as Portland cement concrete or concretes made with other hydraulic cements,...

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What is concrete and what are the advantages of ... - Quora

Concrete is building material mostly used now a days for construction activities, it is used to get desired strength from structure made of it. As it is easy to design and produce concrete of desire strength by using its ingredients like aggregate...

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Can muriatic acid crack concrete? - Quora

Jan 25, 2021  We don’t call it that here. Hydrochloric acid. Anyway, HCl can certainly dissolve concrete. We do that on a daily basis in our lab to enable us to determine sulphate contents and cement contents. (Clearly, we do not use HCl to digest concrete for ...

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When rebar rusts and breaks the concrete, what force is ...

As to the “why” of the question. new concrete has a very alkaline pH. Typically quoted as being 12 to 13 pH units. As carbon dioxide enters the concrete from the air, reactions take place that drastically lower that pH, and leave it around 8 pH units. At 12 - 13, a hard and impermeable “passive” layer forms that prevents corrosion.

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How water content affect strength of concrete? - Quora

How water content affect strength of concrete? It is well known that the strength of concrete depends on the water/cement ratio. The more water one has for a fixed amount of cement, the further apart will be the cement particles. That is a similar...

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What are the different types of shrinkage which occur in ...

Shrinkage of concrete can be classified into the following categories: 1. Plastic Shrinkage: Plastic shrinkage takes place, soon after the concrete is placed in the form work, while the concrete is still in plastic stage. The cement paste at this stage un-goes a volumetric contraction. ... The pH value reduces from 12 to 8. This reduction in pH ...

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When rebar rusts and breaks the concrete, what force is ...

As to the “why” of the question. new concrete has a very alkaline pH. Typically quoted as being 12 to 13 pH units. As carbon dioxide enters the concrete from the air, reactions take place that drastically lower that pH, and leave it around 8 pH units. At 12 - 13, a hard and impermeable “passive” layer forms that prevents corrosion.

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Types and Causes of Concrete Deterioration

humidity of the concrete, and the pH and temperature. 3 Types and Causes of Concrete Deterioration Fig. 4. Deicing salts are a major cause of corrosion of reinforcing steel in concrete. (55807) Table 2. Maximum Chloride Ion Content of Concrete (ACI 318) Maximum Type of Member Cl-*

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Durability of Concrete Types of Durability and Factors ...

Feb 14, 2017  Durability is defined as the capability of concrete to resist weathering action, chemical attack and abrasion while maintaining its desired engineering properties. It normally refers to the duration or life span of trouble-free performance. Different concretes require different degrees of durability depending on the exposure environment and properties desired.

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PhD in Stupidity - Quora

Ayaan Shaikh. Student. . June 9. Hey everyone!! 🎊🎊🎊🎉🎉🎉We’ve crossed the 1K mark on this space. 🎉🎉🎉🎊🎊🎊. Thanks to all of you for following this space and posting on it. Cheers! Ayaan Shaikh.

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What is the difference between fine aggregate and coarse ...

Oct 01, 2020  The strength of concrete depends on the total surface area of aggregates, which has to be coated by cement and the voids in between the aggregate particles, which, again has to be filled with cement. As average particle size decreases, the surface area increases for an unit of concrete, leading to more cement required for coating the surface.

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Water for Construction - GharExpert

It also increases the strength of cement concrete with the same quantity of cement. Note: - pH Value: A method of expressing differences in the acidity or alkalinity of a solution. A figure of 7 is regarded as neutral; figures below this indicate the decree of acidity and above alkalinity.

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Concrete cover - Wikipedia

The carbon steel of rebars is protected from oxidation by atmospheric oxygen by the high pH of concrete interstitial water. Iron bar surface is passivated as long as the pH value is higher than 10.5. Fresh cement water has a pH of about 13.5 while evolved cement water pH ~ 12.5 is controlled by the dissolution of calcium hydroxide (portlandite).

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What is the meaning of corroborate? - English words

Oct 26, 2019  The word ‘Corroborate’ is a verb. It came from the Latin word ‘corroboratus’ means strengthened, and is a perfect passive participle of ‘corroboro’ means ‘I support’. So the meaning of ‘Corroborate’ would be to strengthen the facts with other evidences or to make more certain. It has also the meaning to prove a statement or ...

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If the initial pH for HCL is 2, after adding 10g of NaCl ...

The pH of a solution of HCl in water can be calculated easily. Since HCl is a strong acid, its molecules will dissociate completely in H+ and Cl- ions, as long as the amount of HCl molecules is not too large (say, 1 mole per liter water). If you solve 0,20 moles of HCl in 1,0 L water, you’ll get 0,20 moles of H+ in 1,0 L. pH

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What is the most important untapped resource on the planet ...

Lets address all the problems one by one. 3 bedroom house for everyone- there certainly is enough concrete, wood, and steel to produce enough houses for everyone on earth, in fact in many countries, there are more vacant houses than homeless people like the USA and UK.

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Metakaolin in Concrete: Its Properties, Advantages ...

Oct 02, 2019  01. Use of Metakaolin in concrete accelerates the initial setting time of concrete. 02. It helps in development of the early age strength of concrete which allows the early removal of formwork and thus enhances the production rate. 03. Metakaolin consumes calcium hydroxide thereby preventing the reaction of alkali-silica.

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Best Concrete Cleaners Degreasers - The Concrete Network

Oct 26, 2020  The best degreasers for concrete emulsify, or break down, the oily contamination. The other application for alkaline cleaners is to neutralize concrete surfaces after acid staining or acid cleaning. Alkaline cleaners are the best way to bring the pH of concrete from acidic to alkaline, which is concrete's natural state.

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What are 7 weak acids? - Math Science - Quora

pH is a measure of the concentration of hydrogen ions in a solution. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution. Suppose you had to work out the pH of 0.1 mol dm-3. hydrochloric acid.

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Water for Construction - GharExpert

It also increases the strength of cement concrete with the same quantity of cement. Note: - pH Value: A method of expressing differences in the acidity or alkalinity of a solution. A figure of 7 is regarded as neutral; figures below this indicate the decree of acidity and above alkalinity.

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Is every compound that starts with hydrogen an acid ...

A pH of less than seven is acidic. Pure water has a pH of seven, which is neutral. Water contains both hydrogen ions and hydroxide ions, but water is neutral because the amount of hydrogen and hydroxide ions balance each other. A higher percentage of hydrogen ions in solution results in a lower pH.

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What is the most important untapped resource on the planet ...

Lets address all the problems one by one. 3 bedroom house for everyone- there certainly is enough concrete, wood, and steel to produce enough houses for everyone on earth, in fact in many countries, there are more vacant houses than homeless people like the USA and UK.

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What is the maximum bending moment for the ... - Quora

Therefore the maximum bending moment M in a cantilever beam will take place at the support and will be equal to the force F (if, as usual, you don't take into accoun the self-weight and only a point force applied on the end of the cantilever) multplied by the distance d

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What are the dangers of wading ... - teenagetalk.quora

Jun 12, 2017  The question is - how hot is the sand and how cold is the concrete? Assuming that they are both hot/cold enough to do damage, they are equally dangerous in my opinion. While you would definitely feel the sand searing the skin off your feet, however, the subzero concrete sidewalk might be a little more sinister.

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What is included in a complete set of house plans ... - Quora

Ph : 94899 70193. The ARM Construction, Chennai. CMDA approved 2 BHK Flats in New Perungalathur, Chenni to suit LIG MIG People. Area 740 Sqft to 900 Sqft. Price 26.64* Lakhs to 32.40* Lakhs. * Registration GST Extra, PMAY Scheme subside up to 2.50 Lakhs for 1st time buyer.

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Different Grades of Concrete, Their Strength and Selection ...

Grade of concrete is defined as the minimum strength the concrete must posses after 28 days of construction with proper quality control. Grade of concrete is denoted by prefixing M to the desired strength in MPa. For example, for a grade of concrete with 20 MPa strength, it will be denoted by M20, where M stands for Mix.

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Carbonatation - Wikipedia

Carbonatation is a slow process that occurs in concrete where lime (CaO, or Ca(OH) 2 ()) in the cement reacts with carbon dioxide (CO 2) from the air and forms calcium carbonate.. The water in the pores of Portland cement concrete is normally alkaline with a pH in the range of 12.5 to 13.5. This highly alkaline environment is one in which the steel rebar is passivated and is protected from ...

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97%: An Inconvenient Truth About The Oft-Cited Polling Of ...

Feb 15, 2017  That 97% of all climate scientists accept that climate change is real, large and a threat to the future of humanity. That 97% basically concur with the vast majority of claims made by Vice ...

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What Is Quora Why Should You Care?

Sep 11, 2020  Quora is a top-ranked question and answering community that can form the basis of a successful marketing campaign. This is how to do it. Quora is not only a

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What is a mineral acid which is a weak acid? - Chemistry-Only

Dec 19, 2020  pH is a measure of the concentration of hydrogen ions in a solution. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution. Suppose you had to work out the pH of 0.1 mol dm-3. hydrochloric acid.

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What are some loanwords most English ... - col.quora

Ph.D in Linguistics, UCLA (graduate school) (Graduated 1971) June 3 Mint, pepper, kitchen, cook, church, all borrowed from Latin into Germanic during the late Roman Empire. This was before the name “English” for the North Sea Germanic dialect Anglisc, was even thought of.

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Role of Concrete Curing - Portland Cement Association

Role of Concrete Curing. Curing plays an important role on strength development and durability of concrete. Curing takes place immediately after concrete placing and finishing, and involves maintenance of desired moisture and temperature conditions, both at depth and near the surface, for extended periods of time.

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