Concrete frost damage and concrete allow the critical strength of frozen 1, concrete frost damage: According to the concrete age and frost conditions, can be divided into concrete frost damage and concrete early frost damage two categories. â‘ Frozen concrete, refers to the hardened concrete, after the use of investment, after years of freezing and thawing, the concrete to some of the performance suffered damage reduced or destroyed. The test uses multiple freeze-thaw cycles as a measure of strength or modulus of elasticity. Used to assess the useful life of the project structure. â‘¡ Early frost damage of concrete means that the concrete after pouring is in the stage of condensation, hardening or curing. Before being put into use, the concrete is frozen or frozen and thawed to be frozen due to the negative temperature attack, so as to reduce a series of performance, To design and usage requirements. The test uses one or more freezing methods. As a critical strength assessment index. 2, the critical strength of frozen concrete: newly poured concrete reached a certain initial value before freezing, was frozen, when the restoration of positive temperature curing concrete strength can continue to grow, and then after 28 d after the standardization of the intensity Loss does not exceed 5%. At this time, the initial intensity before freezing is called the critical strength of frozen soil. Portland cement or ordinary portland cement prepared concrete allows the critical strength of the frozen to 30% of the design strength grade; slag Portland cement prepared concrete allows the critical strength of the frozen to 40% of the design strength grade â‘ winter pouring The concrete water-cement ratio shall not exceed 0.6. Because the critical strength value is tested on the premise of the water-cement ratio is not greater than 0.6, so when the concrete construction in winter, when the water-cement ratio is greater than o.6, the strength loss will exceed 5%, less than the design Claim. â‘¡ The design strength grade here refers to the design strength grade of the construction mix ratio, not the design strength grade marked on the design drawing. (This article has Asian Fluid Network members Yao country fluid equipment editor release, please indicate Asia Fluid Network, to promote business consulting hot like :, or add QQ :)
Custom Switchable Film
The color of the smart color changing film can be customized, red, blue, black, gray, green, etc. The dimming film can be divided into roll material and sheet material. There are two sizes of sheets, 165*105mm and 297*210mm (A4 size). The switchable dimming film can be switched according to the width of the division, there are 1m, 1.2m, 1.8m, 2m, can be customized. We have done a variety of projects, such as villa balcony window (to prevent no one peeping), office meeting room (can do projection wall or partition door), floor door (sliding door, automatic door can be matched), shopping mall window, museum 3D exhibition hall, sightseeing elevator glass, car windows and license plates and so on. You can trust us. We have rich experience. Our products have been tested for tens of thousands of times. The probation period is more than ten years. All kinds of certificates are complete. TQX has been continuously developing high-tech products, and 2D and 3D fields have been penetrated.
Custom Switchable Film,Self-adhesive Film For Glass Door,Laminated Glass Smart Film,Magic Film For Glass,PDLC Smart Glass Film,Custom Smart Film For Building
Tianqixun Technology , https://www.tqxdisplay.com