1. Concept of concrete

1.1 What is fresh concrete?

Fresh concrete is ready-mixed concrete, or commercial concrete. This is a mixture of sand aggregate, cement, water and additives in standard proportions with different strength characteristics.

(Hình minh họa, nguồn: Sưu tầm Internet)

Fresh concrete products are applied to industrial projects, high-rise buildings and even residential buildings, possessing many outstanding advantages compared to conventional manual mixing. Because automatic production by machinery and aggregate management from the input stage helps control quality, further shortening construction time and material gathering space.

Currently, the application of fresh concrete is increasingly widespread, it can be used to make foundations, roofs, and become the main material to build reinforced concrete houses.

1.2 What is hand mixed concrete?

Manually mixed concrete, also known as hand-mixed concrete, is concrete that is mixed right at the construction site. The ingredients sand, stone, water, cement... are mixed in specific proportions to get the desired consistency. 

This method requires workers to be careful and meticulous to mix the correct ratio of materials, otherwise it will affect the quality of concrete.

(Hình minh họa, nguồn: Sưu tầm Internet)

2. Advantages and disadvantages of fresh concrete compared to manually mixed concrete

2.1. Advantages of fresh, ready-mixed concrete compared to hand-mixed concrete​

• Construction is faster and does not take much time. Because handmade concrete requires both the process of transporting materials and mixing concrete, it takes quite a bit of time.
• Does not take up space for gathering materials and mixing concrete, so it is very suitable and becomes a solution for projects with small areas and narrow land areas.
• Save dumping costs because there is no need for mixing labor, labor transporting mixed materials, spilled materials….
• Cleaner, neater and more civilized, ensuring environmental hygiene. There is no need to mix concrete at the construction site so it is very clean and neat.

• Labor is not difficult (not carrying, but pumping with a pump)
• Because it is mixed by machinery and inspected, the quality is more uniform.
• There are not many risks when constructing fresh concrete because the construction method is quite simple, driven by a pump, so there is no need to carry or pull up each bucket of concrete.

• High convenience: If you estimate the cost of building a house poured with fresh concrete, it will be much simpler, without needing to calculate the price of each type of miscellaneous materials such as soil, sand, stone, gravel, cement..., we can You can determine the cost from the beginning, just choose the manufacturer and place your order.
• Fresh concrete when poured will reduce noise, especially when it rains.
• Suitable for all construction terrains.
• When constructing a house in rainy weather or during the rainy season, fresh concrete is easier to preserve than hand-mixed concrete.
• By mixing additional additives, it allows the creation of commercial concrete with outstanding features such as waterproofing, heat insulation, quick bonding... so when used for pouring, it will be very convenient.

2.2. Disadvantages of fresh concrete

• Because it is pre-mixed, it is difficult to check the quality of fresh concrete and the ingredients in the concrete, especially when the homeowner does not have experience and does not verify fresh concrete. Many times, in order to make a profit, contractors use unsafe materials such as fragile rocks or sand containing many impurities... which can deceive the homeowner.
• Or use the method of mixing concrete from factories - this concrete should have been used immediately after leaving the factory. If left for a long time, the quality will greatly decrease, if not well preserved. also not up to the quality required to mix fresh concrete, this method also helps to "save" a lot for the supplying contractor.
• So should you pour it with fresh concrete? There are many dangerous ways to cheat. Some places even use cement that is too "dirty", adding a few additives to increase adhesion, and there is... fresh concrete.
• Another form of fraud is for the contractor or concrete truck driver to shake hands with the concrete mixing plant staff to lower their prices; in this way, they will pocket from 100,000 - 300,000 VND/m3 of fresh concrete.

• Although the cost of fresh concrete is low, if poured in a small area, it takes time; And the price is quite similar, not much difference.
• Because when constructing fresh concrete, it will cost money to buy a pump to carry the concrete up.

3. Compare the costs of pouring fresh concrete versus hand-mixed concrete

We compare 1m3 of fresh concrete and self-mixed concrete (same type of pc 40 cement aggregate and 1×2 stone; yellow sand). So if the area is 100m2, how much does it cost to pour concrete?

In addition, the price of fresh concrete Grade 350 is 900,000 VND/m³, Grade 400 is 955,000 VND/m³; Mark 450 is 1,010,000 VND/m³ and Mark 500 is 1,055,000 VND/m³.

We have 1m³ of concrete = 10 m² of construction, so 100 m² = 10m³ of concrete

When pouring concrete, we usually use concrete grade 200; Thus, a roof with an area of ​​100m² will cost concrete = 1,250,000 x 10 = 12,500,000 VND (fresh concrete) and for hand-mixed concrete the price is 1,067,000 x 10 = 10,670,000 VND.

From the above analysis, it is concluded; The cost of pouring manually mixed concrete for 100m² is about 2 million VND less than fresh concrete. The unit price above is just to illustrate for you to understand, the market price may vary slightly because the current unit price may be different. However, as we see above as well as current reality, concrete will cost more than hand-made concrete.

4. Notes when using fresh concrete

Even though there are good technical specifications, the contract must be clear about quality standards; Concrete marks and compensation terms in case of problems because it is difficult to control quality; (I do not follow the process of preparing mixing materials).

• Currently, there are many tricks for suppliers to profit by using poor quality materials to produce concrete; or changing the grade of concrete reduces the durability of concrete, leading to cracking; leaks after use.
• When receiving concrete, you must check whether the concrete truck still has lead seals or not; The delivery invoice must comply with the standards signed in the contract and samples must be taken for later testing.

• Consult the market price before ordering commercial concrete and learn about the experience of choosing concrete from those who have used it, then you will know whether to pour with fresh concrete or not.
• Which brand of concrete should be poured? Choose reputable suppliers by referring to families who have used concrete before.
• For small houses, the pouring process is not fast; Much better than mixing concrete by hand.
• Concrete should be cast into 15x15x15cm cubes; so that it will be easier to decide later if used to build a house.
• After pouring concrete, when watering, only go to the beam position; Spread the pineapple bag, rub the scrubber on the concrete.
• You can choose fresh concrete grade 250 instead of grade 200.

5. Introducing a reputable design & construction consulting service provider

The importance of construction units is undeniable because their reputation will ensure the quality and aesthetics of your project. Today, there are many units providing construction design services to meet the increasing construction demand in our country. Therefore, finding a reputable unit is not easy and requires you to spend time researching. During the selection process, you need to research carefully and ensure that the accompanying unit must have high professional qualifications, many years of experience, have a clearly signed contract, transparent costs,... Nowadays, according to feedback from some customers who have contacted Hung Nghiep Phu shows that there are currently many fraudulent units that are construction design consulting companies to scam people for many different purposes. To help customers save time searching, Công ty TNHH Đầu Tư Xây Dựng Hưng Nghiệp Phú is confident that it will be the best choice for you.

Hung Nghiep Phu Construction Investment Co., Ltd. with the mission of bringing the best solutions and services, together with customers to build a prosperous community, Hung Nghiep Phu is gradually asserting its brand through Sincere cooperation, with a team of leaders with ethical capacity, creativity, dedication to the profession, and strategic vision. Hung Nghiep Phu owns a team of skilled and highly qualified staff who will bring customers the best quality projects. 

Hung Nghiep Phu Construction Investment Company Limited - specializes in constructing civil and industrial projects. We look forward to accompanying customers in construction projects as well as legal procedures such as planning diagrams, applying for construction permits, completing processes, applying for fire prevention and fighting certificates, ... If you have any questions or are in need of designing and perfecting the process, please contact us immediately for a free consultation!

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Source: Collected Internet