Does the method of solving hydroxypropyl methyl cellulose (HPMC) have those?
HPMC powder and a large number of other powdery material ingredients, mixing fully with a blender, and then adding water to dissolve, HPMC can dissolve at this time, without agglomeration, because each small corner, only a little bit of HPMC powder, water will dissolve immediately. - Putty powder and mortar production enterprises are using this method. [Hydroxypropyl methyl cellulose (HPMC) is used as thickening agent and water retaining agent in putty mortar
Hydroxypropyl methyl cellulose (HPMC) is divided into several, what is the difference of its use?
HPMC can be divided into instant and hot dissolve, instant products, in cold water quickly dispersed, disappeared in the water, at this time the liquid has no viscosity, because HPMC is just dispersed in water, no real dissolution. For about two minutes, the viscosity of the liquid gradually increases, forming a clear, sticky gel. Hot soluble products, in cold water, can be quickly dispersed in hot water, disappear in hot water, when the temperature drops to a certain temperature, viscosity slowly appear, until the formation of transparent viscous colloid
Qingdao metro tunnel construction uses special cement impermeable and waterproof
On the afternoon of May 8, Fan Yanxiang, chief engineer of Qingdao Project Department of China Railway Bureau 19, introduced to Qingdao media reporters the first phase of the subway line to achieve the first section and station through the connection. Located in Nanjing Road, it is one of the sections with the largest traffic volume and human flow in the urban area, as well as one of the most difficult sections for construction. Fan Yanxiang explained that considering the station's location is a bustling urban area, with large traffic flow, dense underground pipelines and high surface settlement control standards, the main structure and air duct of the station on Jiangxi Road are all excavated with a large excavation surface and a depth of about 20 meters.
Gas masonry wall plastering crack control
The aerated block has low strength, high water absorption and large shrinkage deformation, and cracks often appear in the traditional wall masonry and wall plastering process. This quality of common disease, has been plagued by developers and construction enterprises. There are more and more complaints about wall cracks and even leakage. Therefore, analyzing the causes of cracks and seeking measures to control cracks has become the subject of common concern of all parties in the construction industry. Based on the author's many years of field construction practice, this paper discusses some experiences on the control of plastering cracks on the walls of aerated masonry.
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