Can the standard of C15 for cast in place concrete in private houses be used?

1. It can be used, but the durability of the house is not guaranteed. Generally, C15 concrete can reach the strength of 20 concrete in 28 days, and it generally cannot collapse, so pay attention to health preservation.

2. Cast-in-place concrete, at the construction site.

Concrete poured by formwork. Unlike precast concrete, most buildings are built with cast-in-place concrete.

3. Concrete, referred to as "concrete (tóng)": refers to the cementitious material.

A general term for engineering composites that cement aggregates into a whole. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete, also known as ordinary concrete, is widely used in civil engineering engineering when it is mixed with water (which can contain admixtures and admixtures) in a certain proportion and is mixed to obtain cement concrete.

Whether the collapse is a collapse or not, it mainly depends on the steel bar. Your concrete grade is low. But since it's poured, so be it.

If you choose commercial concrete, the strength can be improved in the later stage. For now, let's get a good job of maintenance. If the room is not large, don't worry too much, but try to keep as few people as possible in the early stage and don't put too many things.

If you want to do insulation or something, try to use some lightweight materials.

The foundation cushion can be used, but the main structure cannot.

Since you are able to calculate the strength of the C15, there is a way to detect its physical strength.

How did you calculate that?

Yes, the specification changed to C15 concrete:

1. The design values of the axial tensile and compressive strength of concrete have changed, and the standard values of the axial tensile strength and compressive strength of concrete have changed. Attention to the technicians, testers, and data clerks on site.

2. The commercial concrete batching plant has to keep up with the pace of specification revision and modify the mix ratio.

3. The constructors have to pay attention to the construction of the cushion, C15 is gone.

4. The cost budget personnel of both parties must also know that the concrete strength grade has been improved, and the cost must be added accordingly.

The concrete strength grade of plain concrete structure should not be lower than C15; The concrete strength grade of reinforced concrete structures should not be lower than C20; When using steel bars with a strength grade of 400MPa and above, the concrete strength grade should not be lower than C25.

The concrete strength grade of the prestressed concrete structure should not be lower than C40 and should not be lower than C30. Reinforced concrete elements subjected to repetitive loads should not have a concrete strength class of less than C30.

Cement can be used to prepare C15 concrete, and C15 concrete cannot be used for pouring reinforced concrete, but can be used as cushion concrete.

Sand, stone, and cement must be tested, and there are experimental units that have been optimized to give a mix ratio of three.

What strength grade of cement is used for C15 concrete is not determined. Even the minimum amount of cement to be used is not fixed (Article 1).

Design Code for Ordinary Concrete Mix Ratio" JGJ55-2011

C15 concrete is concrete with a standard value of 15MPa in compressive strength.

The strength grade of concrete is divided according to the standard value of the compressive strength of the cube specimen. The standard value of the compressive strength of the cube specimen refers to a value in the overall distribution of the compressive strength measured by the standard test method with the standard test method at the age of 28 days for the cube specimen with a side length of 150 mm, and the percentage of strength below the value shall not exceed 5%, that is, the guarantee rate is 95%. The strength grade of concrete is expressed by the number of megapascals of the code C of concrete and the standard value of the compressive strength of the cube specimen.

The strength of concrete reaches 15 megapascals.

Answer: Hello, do you mean the c15 on the memory module, the timing refers to the general number "a-b-c-d", and the corresponding parameters are "cl-trcd-trp-tras", their meanings are: cas latency (referred to as cl value) memory cas delay time, it is one of the important parameters of memory, some brands of memory will print the cl value on the label of the memory module; ras-to-cas delay (trcd), the delay time for the transfer of the memory row address to the column address; ras precharge delay (TRP), the memory line address strobe pulse precharge time; Row Active Delay (Tras) is the gating delay of the memory line address. These are the 4 timing adjustments that gamers are most concerned about, which can be set in the BIOS of most motherboards, and memory module manufacturers also plan to launch low-latency overclocking memory modules that are below the JEDEC certification standard, and at the same frequency setting, the memory module with the lowest "2-2-2-5" sequence sequence can indeed bring higher memory performance than "3-4-4-8", with an amplitude of 3 to 5 percentage points.

C15 refers to the strength grade.

The most important mechanical properties of concrete after hardening refer to the ability of concrete to resist stresses such as compression, tension, bending, and shear. The water-cement ratio, cement variety and dosage, aggregate variety and dosage, as well as mixing, forming and curing all directly affect the strength of concrete. The strength grade of concrete according to the standard compressive strength (the cube with a side length of 150mm is used as the standard specimen, cured for 28 days under standard curing conditions, and the compressive strength of the cube with a 95% guarantee rate measured according to the standard test method) is called the label, which is divided into C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80, C85, C90, C95, There are 19 grades in C100.

The tensile strength of concrete is only 1 10 1 20 of its compressive strength. Improving the ratio of tensile and compressive strength of concrete is an important aspect of concrete modification.

Commercial concrete is commercial concrete, created in 1953 by the famous structural scientist Professor Cai Fangyin, on June 7, 1985, the Chinese Character Reform Committee officially approved"Concrete"with"concrete"Synonymy.

What strength grade of cement is used for C15 concrete is not determined. Even the minimum age of cement is not fixed (Article 1).

Ordinary concrete late brightness mix ratio set grip Dan opening gauge regulations" JGJ55-2011