👉OPC Vs PPC cement

🌟PPC:PPC or Portland Puzzolana Cement is a mixture of Puzzolanic material with Argillaceous and Calcareous materials in powdered form. Puzzolana increases the strength of the cement but initial setting time is more than OPC. Puzzolana should be in the range of 10–30%. If more than this range then strength will be reduced. It is useful for most Civil construction works like mass concreting etc. It is economical for projects as less cost of cement than OPC. Gypsum is used for controlling of setting time.

🚧ADVANTAGES OF PPC

1. Higher durability of concrete structure due to less permeability of water.
2. More resistance towards the attack of alkalies, sulfates, chlorides, chemicals.
3. Better workability.
4. Low heat of hydration.
5. Due to high fineness, PPC has better cohesion with aggregates and makes more dense concreteness.
6. Comparative lower Water-Cement ratio provides an added advantage for the further increase of compressive strength of the concrete.
7. Better surface finish.

🌟OPC:OPC or Ordinary Portland Cement is a mixture of Calcareous materials with Argillaceous material in proportional ratio.
Gypsum is used for controlling the setting time. It has less setting time than PPC. It is useful where work to be complete soon. It is costlier than PPC. It is available in various grades such 33, 43 & 53. OPC grade 43 is very useful nowadays.

🚧ADVANTAGES OF OPC

1. Produces highly durable and sound concrete due to very low percentage of alkalis, chlorides, magnesia and free lime in its composition.
2. Almost negligible chloride content results in restraining corrosion of concrete structure in hostile environments.
3. Significant saving in cement consumption while making concrete of grades M15, M20, M25, M35 and pre-cast segments due to high strength.

🖱DIFFERENCE BETWEEN OPC AND PPC

▶️ORDINARY PORTLAND CEMENT (OPC)

1. OPC is produced simply by grinding limestone and secondary materials to a powder. The main raw materials used for manufacturing OPC is calcareous material, argillaceous material, and gypsum.
2. The durability of OPC is lower than PPC.
3. The setting time is of OPC is less than PPC.
4. Costlier than PPC.
5. Mostly used where fast construction is required.
6. The different grades of OPC are:
OPC 33 Grade
OPC 43 Grade
OPC 53 Grade

▶️POZZOLANIC PORTLAND CEMENT (PPC)

1. PPC is a variation of OPC which includes a mixture of a pozzolanic material which is known to increase the strength of concrete. The raw materials used for manufacturing of PPC is OPC, gypsum, pozzolanic materials such as fly ash, rice husk ash, volcanic tuffs and pumicites, clay & shale, etc.
2. Mostly used in mass concreting, plaster and masonry.
3. Durability is high.
4. Setting time is greater than OPC.
5. Curing period is a little higher than OPC.
6. It can be used in all type of construction work.
7. There are no such specific grades of PPC like OPC.
8. Low cost

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የመፅናናት አምላክ

ሀዘን ዉስጥ ያላችሁ ቤተሰቦቻችን ሁሉ እግዜአብሄር ያፅናናቹ ልባችሁን ያበርታዉ::

ኣጆኹም!

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What is a Wall-Beam-Strut Joint?

A structural connection where a beam is supported by a wall with additional bracing provided by struts for stability and load distribution.

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👉Purpose of stirrup

1. It increases the compressive strength of the column (column is compressive member)

2. It can improve the ductility of column

3. Stirrups prevent the buckling of amin reinforcement bar

4. At the time of concreting it prevents the movement of main reinforcement

5. Improve dowel action of column reinforcement

6. In beams stirrups used for lump sum same purpose as in column

7. To provide lateral confinement of longitudinal bars

8. It provide resistance against shear and torsion

9. To hold longitudinal bars during construction

10. It confine the concrete in the core , thus improving ductility and strength

11. It prevents premature buckling of individual bars

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👉ውድ የ ETCONp ቤተሰቦች እንዴት ናችልን

🌟ዛሬ ደሞ ስለ ካራክተርስቲክ እስትሬንግዝ እና ካራክተርስቲክ ሎድ ምንድንነው ኣብረን እንይ

🚧Characteristic Strength - ማለት የኮንክሪት ወይም የብረት ቴስት አድርገን
ለእያንዳንዱ ቴስት ካገኘናቸው ውጤቶች ውስጥ አምስት ፐርሰንቱን ብቻ የሚበልጥ ውጤት ነው Ka - እስትሬንግዝ ማለት፡፡ ወይም ደግሞ 95 ፐርሰንቱ የቴስት ውጤቶች የሚበልጡት ውጤት ነው፡፡

⏺ትንሹ እስትሬንግዝ ነው ማለት ይቻላል፡፡

▶️ፎርሙላውም- [ fc = (mean strength)- 1.64(standard
deviation) ]

🚧Characteristic Load - ማለት ህንፃው በዘመኑ ያጋጥመዋል ተብሎ ከሚታሰበው ውስጥ አምስት ፐርሰንቱ ብቻ የሚበልጡት load ነው፡፡

⏺ፎርሙላውም - [ fk = (mean load) + 1.64(standard
deviation) ]

🖱ካራክተርስቲክ ሎዱንም ሆነ እስትሬንግዙን ስንወስድ በሁለቱም በኩል ህንፃው ሴፍ ነው::

▶️ምክንያቱም እስትሬንግዙን ስንወስድ ህንፃው ትንሽዬ እስትሬንግዝ አለው ብለን ነው የምንወስደው::

🖱ሎድ ስንወስድ ደግሞ ለትልቁ ሎድ ነው የምንወስደው።

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