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We Build Your Vision
Our services encompass plan designs, construction maps, and building projects. We specialize in active surveying, water supply systems, and electrical works.
Services
Founded in 1357, Rahim Sultani Construction Company initially operated under the name of Consultation Office Surveying and Engineering Rahimi. Since 1381, we have rebranded and expanded our expertise in various architectural and construction domains.
Modern Tools & Equipment
Equipped for Success: 25+ Advanced Machines and Half a Century of Construction Mastery.
Years of Experience in the Field
Crafting Landmarks of Trust: 50+ Years of Unmatched Construction Excellence.
Ready to Break Ground on Your Next Project?
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Projects
Projects
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Methodology
Methodology
Survey and Site Assessment:
Our technical team will conduct a survey of the given site at the commencement and completion of work. Benchmarks will be established to ensure the area is cleaned and grubbed.
Prepare Bill of Quantity and Cost Estimation:
After a technical study of the SOW and a site visit, a team will conduct a market survey to determine the market prices for materials and services required for the project. This ensures that the price assessment is competitive and reasonable.
Security of Staff, Equipment, Tools, and Machinery:
Every possible measure will be adopted to ensure the security of staff, machinery, and equipment at our own risk and cost. Our staff will coordinate with local authorities to obtain daily security and law and order information, enabling us to plan security measures accordingly.
Mobilization of Staff, Equipment, Tools, and Machinery:
Mobilization will occur after site assessment and arrangement of a secure and safe place for coordination and storage.
Site Cleaning for Construction Work:
The site will be cleaned to avoid any disturbance to the construction process. The work site perimeter will be cleaned and grubbed. Unskilled labor equipped with picks and shovels will perform the cleaning, with light machinery used if necessary.
Supply of Construction Materials, Equipment:
All equipment, materials, and articles incorporated into the work will be new and of the most suitable grade for the intended purpose, according to the specifications and codes outlined in the contract.
Our engineering team will conduct a proper site assessment for project implementation and collect all necessary measurements and data from the site.
Excavation:
The excavation will be done along the profile with the specified width and depth. The bottom level of the excavation for the foundation of reinforced concrete will be properly leveled. The foundation excavation will extend an adequate distance from both sides to allow for placing and removing forms. Surface water will be directed away from the excavation to prevent erosion and undermining the foundation by constructing diversion ditches.
Grading:
Grading will be done after excavation of the foundation. The sub-grade will be compacted soil at 95%.
Placing of Concrete:
For placing and working with concrete, the following specifications will be considered: The concrete strength will be 3000 psi for construction and walls. I've made some corrections and improvements to your text for clarity and consistency. Here's the revised version:
Ingredients of Concrete:
Concrete is composed of coarse aggregate, cement, and water. Cement acts as the binding material. Rock chips are used as coarse aggregate, while sand is used as fine aggregate. Clean water is used to mix all the ingredients to form hardened concrete. The quality of concrete depends on the quality of its ingredients.
After producing fresh concrete, a slump test should be performed immediately after collecting the sample but not later than 10 minutes after completion of mixing. Molding of test cylinders/cubes should commence within 20 minutes after completion of mixing. The strength requirement of concrete is given in the table below:
Strength (standard deviation not exceeding: 2.1 MN/m² (3000 PSI)). Minimum three samples will be required for testing from each batch.
Rock chips are the main constituents of concrete and occupy the bulk volume of concrete.
The desired qualities of aggregates are:
- Aggregate shall be of the desired size.
- All aggregate must be clean and free from foreign particles.
- All aggregate must be hard and have the desired strength.
- Aggregate must be well graded.
The desired qualities of sand are:
- Sand as fine aggregate must be clean and free from foreign particles.
- Sand must be well graded.
- Fineness modulus of sand should be the desired value.
Cement is the binding material for the ingredients of concrete. Ordinary Portland cement is used in Afghanistan, and Pakistan-made cement has given good results and is widely used. Cement is generally tested before use, and the tests include:
- Fineness
- Setting time
- Compressive strength
Water for mixing concrete should be free from impurities and clean.
The ratio of cement, sand, and aggregate is expressed by volume. The strength of concrete depends on this ratio. Common ratios are 1:3:6, 1:2:4, and 1:1:5. For high strength, a 30 cm width (volume 1.25 ft. of 0.035375 m) is considered. Due to the bulking of sand, the volume of sand should be adjusted accordingly. For 25% bulking of sand, the volume of sand to be considered would be 1.25 times the original volume.
The strength of concrete depends on the water-cement ratio, calculated based on the weight of water and cement. The amount of water should be such that the fresh concrete is workable, and the hardened concrete can withstand the desired loads. Excess water decreases the strength of concrete.
For example, if the water-cement ratio is 0.55, then water will be 0.55 * 50 kg = 27.5 liters.
– For smaller quantities, mixing will be done by hand. For larger quantities, a mixing machine may be used.
– The mixture should be homogeneous.
– 5-10% of the total volume of water should be added to the turning drum before cement, sand, and aggregate are applied.
After mixing, the concrete should be carried to the specified site as quickly as possible. All mixed concrete should be placed in its final position within 45 minutes. Mixed concrete should be placed at a height of 1 meter. Excess water should not be added while placing or vibrating the concrete.
Concrete should be compacted by means of vibration. This can be done by poking concrete with rods or using a vibrator. All vibration should be completed before the initial setting time. In the absence of a vibrator, a 16 mm diameter rod can be used as a vibrator.
Curing increases the strength of concrete. Cement contains chemicals that require hydrolysis for a chemical reaction to form a rock-like substance. This reaction takes place over 21 to 28 days, so curing of concrete is required for 28 days. Curing is done by spreading water on the concrete surface or covering it with wet sacks to prevent evaporation. It generally starts after 16 to 24 hours of casting.
Concrete is produced from cement, coarse aggregates, fine aggregates, and water. The quality of concrete depends on many factors, including:
- Properties of the ingredients
- Proportion of ingredients
- Water-cement ratio
- Mixing, carrying, placing, compacting, and curing
Reinforcing Rods/Reinforcement:
Concrete can resist compression but not tension. For this reason, reinforcing rods are provided in concrete to sustain tension. The reinforcement material includes high-strength steel wire, mild steel, and high-strength plastic fibers.
The following should be considered while checking reinforcement:
- Appropriate diameter of reinforcement
- All rods must be clean and rust-free
- All rods should be straight
- Appropriate bends in rods are placed at the proper locations
- Length of lapping of rods is provided as per requirement
- Rods are placed according to the drawing
- For maintaining clear cover, chair/space bars are provided
- Actual size of rods is used
- Rods should be uniform in size
- Rods should have the desired tensile strength
Team
Team
Eng. Saifurahman Rahimi
President
Eng. Abdul Rahman Rahimi
Vice President
Mahammad Nader Gharawal
Consultant
Abdul Rahman
Administrative Manager
Posts
Posts
Post Number 10
April 15, 2025
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July 5, 2021
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July 5, 2021
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