High strength and high durability fiber ceramsite concrete

Abstract

The invention provides high strength and high durability fiber ceramsite concrete, the concrete is prepared from the following components: 432 to 486 kg / m<3> of cement, 44 to 108 kg / m<3> of coal ash,0 to 54 kg / m<3> of mineral powder, 551 to 620 kg / m<3> of ceramsite, 141 to 162 kg / m<3> of water, 707 to 750 kg / m<3> of river sand, 0.8 to 1.2 kg / m<3> of polypropylene fiber, 4.32 to 5.4 kg / m<3> of water reducing agent. The concrete provided by the invention has better anti-crack property, bearing, stability and durability, the compressive strength after being tested for 7 days is 40.1 MP, the compressive strength after being tested for 28 days is 59.5 MP, chloride ion penetration resistance grade is Q-III, freezing and thawing cycle in clear water is 200 times, the freezing and thawing cycle in 3% sodium chloride salt solution is 175 times.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-strength and high-durability fiber ceramsite concrete. Background technique [0002] In the northern part of my country, the winter time is long, and the winter temperature has been continuously below zero degrees Celsius, even around minus 20 degrees for a long time. Icing forms a back-and-forth freeze-thaw cycle, which has caused certain damage to the structure of the building. Due to the long-term freeze-thaw cycle of the buildings in the northern severe cold region, some buildings can only operate for about 30 years, and some even fail to reach It has been out of use for 20 years. For the safety of traffic in snowy environment, sprinkle salt to melt ice and snow has become the main way of snow removal on road bridges, however, the penetration of deicing salt and the re-checking effect of freeze-thaw are more likely to cause spalling of concrete and cause safety acciden...

AI Technical Summary

Problems solved by technology

[0002] In the northern part of my country, the winter time is long, and the winter temperature has been continuously below zero degrees Celsius, even around minus 20 degrees for a long time. Icing forms a back-and-forth freeze-thaw cycle, which has caused certain damage to the structure of the building. Due to the long-term freeze-thaw cycle of the buildings in the northern severe cold region, some buildings can only operate for about 30 years, and some even fail to reach It has been out of use for 20 years

For the safety of traffic in snowy environment, sprinkle salt to melt ice and snow has become the main way of snow removal on road bridges, however, the penetration of deicing salt and the re-checking effect of freeze-thaw are more likely to cause spalling of concrete and cause safety accidents. Structural failure caused by durability problems such as fusion and chloride ion penetration has caused huge economic losses and even major safety accidents

Moreover, with the continuous development of society, more requirements are put forward for the structure, which makes ordinary concrete heavy, poor crack resistance, low durability and other problems seriously restrict the development of society