Transparent Roller Shutter Door
Material: polycarbonate (PC bulletproof plastic)
Using aluminum profiles for door connection piece, two-layer structure , special design ,embedded into the door sheet. Simple and elegant, strong resistance to stress.
The base is made of aluminum alloy, special design, corrosion-resistant simple and aesthetic.
Mute track is made of aluminum alloy, dual-slot design, the mute material can be embedded into the slot, and creating a quiet environment.
Control system : 24V DC , mute operation, safe and reliable , durable and long life . In the case of obstacles ,doors rebound or stop automatically stop during opening and closing process.
Door opening and closing process, lighting and delaying three minutes automatically ; users can switch to manual option when power failure, uninterruptible power supply . Please contact with our technical department for particular requirements.
Transparent Roller Shutter Door,Transparent Curtain Roller Shutter Door,Commercial Transparent Roller Shutter Door,Polycarbonate Transparent Roller Shutter Door Shenzhen Hongfa Automatic Door Co., Ltd. , http://www.selfrepairinghighspeeddoor.com
The quality of cement is directly related to the extremely durable quality of the building, and it is also the key link of the quality control of the mixing station! Today's cement industry is a mess: Unqualified clinker is the norm. The content of clinker in cement is much lower than the standard value is the norm. "Small cement" can't be called cement at all, but it can only be called abrasive. Cement supervision is seriously missing! Reliance on inspection intensity, setting time and stability are far from enough.
1. Clinker: Standards stipulate that the calcium silicate mineral is not less than 66%, and the mass ratio of calcium oxide to silica is not less than 2.0. Can these indicators of our cement plant often qualify? ! Often only strength tests are performed.
2. Content of clinker in cement: Standard stipulates that ordinary Portland cement clinker + gypsum content should be greater than or equal to 80% and less than 95%. Nowadays, the content of clinker in Liancheng Cement Plant is generally only 65%-70%, not to mention the small cement factories around the capital (in fact, it can only be called a grinding station, or how to obtain the name of the cement plant). It is known that the clinker content of ordinary small cement is only about 50%. Small cement can not be called cement, at best, can be called mixed material!
3. Detection methods: Cement is supervised and managed by the Technical Supervision Bureau, and it is sampled once a year. It is impossible to constrain the cement plant's production. The mandatory items for national inspection standards are strength, setting time and stability, plus some chemical indicators, which are far from enough! It is easy to meet these few indicators with a small hand made cement!
We should strictly test the clinker. We should increase the detection of clinker content during cement acceptance. We should not only measure the strength, setting time and stability. Of course, chemical indicators such as magnesium oxide and sulfur trioxide must not be less!
How to distinguish the cement quality of the mixing station?
How to identify the concrete mixing station cement quality is the key.