How long is the initial setting period of concrete? What is the initial setting time of concrete?

The initial setting of C35 concrete is 45

The initial setting time of all concrete shall not be less than 45 minutes. GBT Standard for Performance Test Methods for Ordinary Concrete Mixtures" Chapter 4.

Condensation time test.

The initial setting of concrete is generally 6 10h, the final setting is 10 14h, the initial setting is generally 12 16h in winter, and the final setting is 16 20h

The initial setting time of concrete depends on the specific temperature situation, the initial setting time is short when the temperature is high, the initial setting time is long when the temperature is low, the initial setting time of concrete is generally 4-10 hours, and the final setting time is 10-15 hours.

The speed of the setting time has a great impact on the construction method and the progress of the project, so the determination of the setting time should be carried out to test whether it meets the requirements of concrete construction. Different retarders, mix ratios, and external temperature will change the initial setting time of cement.

Before measuring the coagulation time, it is necessary to check whether the sliding part of the instrument can slide freely in the bracket, and at the same time check that when the test rod is lowered to the surface of the slurry, the pointer should be the zero point of the calib, otherwise it should be adjusted. Before measuring the setting time, the consistency test rod should be removed and replaced with a test needle, and at the same time, check whether the pointer is zero when the test needle is in contact with the top of the round mold, otherwise it should be adjusted.

Before each measurement, the instrument should first be placed vertically and steady, and it should not be operated in an environment with obvious vibration. After each measurement, the working surface of the instrument should be wiped clean and oiled to prevent rust. The surface of the slide bar should not be bruised or rusted.

The initial setting time of concrete is 1-6 hours, and the final setting time is 3-24 hours. The initial and final setting time of concrete is not fixed, and there is a large time range variation, because the initial and final setting time of concrete is related to admixtures, cement types, ambient temperatures, etc.

For example, ordinary cement for concrete.

The initial setting time is not less than 45 minutes, and the final setting time is usually not more than 10 hours. If the concrete is made of Portland cement.

The initial setting time is not less than 45 minutes, and the final setting time is usually not more than an hour. Under normal circumstances, the initial and final setting time of concrete in summer will be shorter than that in winter.

The use of admixtures in concrete will shorten or delay its initial and final setting time, for example, in a 20-degree environment, the concrete will be initially set in about 5 hours and finally set in about 6 hours. If it is mixed with a high-efficiency retarder, it will initially coagulate in about 12 hours and finally coagulate in about 16 hours.

The concrete configuration should not be left for too long after it has been mixed evenly, for example, in the summer when the construction temperature exceeds 30 degrees, we need to use up the concrete mortar within an hour. If the concrete mortar is placed for too long and solidifies, it will be mixed and poured with water, which will affect the quality of the concrete components. The initial setting of concrete mortar can no longer be poured.

The initial setting time of concrete beams and slabs is 8h 12h, and the initial setting time of large-volume concrete is 12h 15h. Before the initial setting of the concrete of the protective layer of the exposed surface, the covering should be rolled up, and the surface should be rubbed with a trowel at least twice to make it smooth and covered again, and it should be noted that the covering should not directly touch the concrete surface until the concrete is finally set.

Summary. Kiss! Hello, happy to answer your <>

The initial setting time of pro-concrete is 2-3 hours, and the initial setting time of concrete is generally determined according to the cement variety, and there is basically no unified time, but there is a general range of 2-3 hours. If the pre-setting agent is added, the initial setting time can be roughly shortened to half an hour; If a retarder is added, the initial setting time can be extended to 5-10 hours. The specific initial setting time is generally determined by the test, and each batch of cement in each factory must be tested.

Ordinary concrete, generally refers to cement as the main cementitious material, with water, sand, stone, if necessary, mixed with chemical admixtures and mineral admixtures, according to the appropriate proportion, after uniform mixing, dense molding and curing hardening of artificial stone. Concrete is mainly divided into two stages and states: the plastic state before setting and hardening, that is, fresh concrete or concrete mixture; The hard state after hardening, that is, hardening into concrete or concrete.

At present, the strength grade of ordinary concrete in China is divided into 14 grades: C, C20, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75 and C80. Hope mine can help you <>

Do you have any other questions?

What is the initial setting time of concrete?

Kiss! Hello, happy to answer your <>

The initial setting time of pro-concrete is 2-3 hours, and the initial setting time of concrete is generally determined according to the cement variety, and there is basically no unified time, but there is a general range of 2-3 hours. If the pre-setting agent is added, the initial setting time can be roughly shortened to half an hour; If a retarder is added, the initial setting time can be extended to 5-10 hours. The specific initial setting time is generally determined by the test, and each batch of cement in each factory must be tested.

Ordinary concrete, generally refers to cement as the main cementitious material, with water, sand, stone, if necessary, mixed with chemical admixtures and mineral admixtures, according to the appropriate proportion, through the wheel which is evenly stirred, densely formed and cured and hardened into artificial stone. Concrete is mainly divided into two stages and states: the plastic state before setting and hardening, that is, the newly mixed tung burning concrete or concrete mixture; The hard state after hardening, that is, hardening into concrete or concrete.

At present, the strength grade of ordinary concrete in China is divided into 14 grades: C, C20, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75 and C80. Hope mine can help you <>

Do you have any other questions?

Today's weather is 14-2 degrees, C25 is poured this morning, can the woodworking materials be hoisted tomorrow afternoon?

Yes, yes.