How to use polycarboxylate superplasticizer for different kinds of concrete?
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Al-Zawahiri joined al-Qaeda led by Osama bin Laden in 1998. As the organization's "chief strategist", al-Zawahiri is the top planner of most terrorist attacks, including the 1998 bombings of US embassies in Tanzania and Kenya, and the "9 / 11" terrorist attacks that shocked the world in 2001. Al-Zawahiri was appointed leader of al-Qaeda in June 2011 after the death of Osama bin Laden.
Afghan interim government spokesman Mujahed condemned the United States for carrying out drone strikes in Afghanistan.
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According to Gazprom's preliminary estimates, in the first seven months of this year, international natural gas demand decreased by 35 billion cubic meters compared with the same period last year. Among them, the demand for natural gas in the 27 member states of the European Union fell by 31 billion cubic meters during this period.
Because of the turbulent international situation, the supply and prices of many international bulk pce powder are still very uncertain.
Prestressed or precast concrete
Adding polycarboxylate superplasticizer can make the compressive strength of precast concrete reach 40MPa grade at 8h to 18h; the precast concrete mixed with polycarboxylate superplasticizer can get higher early strength under the condition of lower curing temperature and shorter curing time, thus reducing the energy consumption of curing; in addition, it can save cement, reduce vibration energy consumption, reduce noise and improve the turnover rate of the mold.
Shrinkage compensating concrete
When preparing shrinkage compensating concrete, adding a certain amount of polycarboxylate superplasticizer can reduce the water-cement ratio, increase the early shrinkage of concrete and reduce the later shrinkage of concrete, thus saving expansive agent or expansive cement.
Ordinary aggregate concrete
For ordinary aggregate concrete, the addition of polycarboxylate superplasticizer can reduce the pumping pressure and pipe pressure by about 30%; for lightweight aggregate concrete, the addition of polycarboxylate superplasticizer can reduce the pumping pressure and pipe pressure by more than 10%; in addition, the addition of polycarboxylate superplasticizer can reduce the increase of pumping resistance with the increase of pumping speed.
Steel-fiber reinforced concrete
For steel fiber reinforced concrete, the addition of polycarboxylate superplasticizer can reduce the workability loss caused by the addition of steel fiber; of course, compared with the concrete without steel fiber, the amount of polycarboxylate superplasticizer mixed with steel fiber reinforced concrete should be appropriately increased.
Super high strength concrete
Polycarboxylate superplasticizer has good water-reducing dispersion and strengthening effect, so it can be used to prepare ultra-high strength concrete. The study found that the concrete mixed with polycarboxylate superplasticizer (20%), which accounts for 1% to 3% of the weight of the cementitious material, can make the 100-day-old strength as high as 150MPa.
High-alumina cement concrete
In order to ensure the performance of high-alumina cement concrete, the general water-cement ratio is not higher than 0.40 and the cement content is not lower than 400kg/m3, otherwise the strength of concrete, especially in the later stage, will decrease. The reason is that metastable calcium aluminate hydrate is transformed into steady tricalcium aluminate hydrate. If polycarboxylate superplasticizer is added to high alumina cement concrete, the fluidized concrete with good workability can be obtained under the condition of low water-cement ratio, and the later strength of concrete is not affected. That is to say, the 2d compressive strength of high alumina cement superplastic concrete mixed with polycarboxylate superplasticizer is lower than that of standard concrete, while the compressive strength of 180d age is basically the same as that of base concrete, because polycarboxylate superplasticizer has no obvious effect on the hydration rate of high alumina cement.
High-performance concrete with high content of active admixtures such as fly ash, slag, and silica fume
When preparing high-strength concrete with a large amount of fly ash instead of ordinary cement, adding polycarboxylate superplasticizer can improve workability, reduce mixing water consumption by about 20%, and further improve strength. The addition of polycarboxylate superplasticizer into concrete can increase the amount of cement-based substitute materials such as fly ash or slag and reduce the amount of cement without affecting the strength of concrete. therefore, it has outstanding environmental and economic benefits. Similarly, when silica fume is added to cement slurry or concrete, the amount of water needed to achieve the same workability increases with the increase of silica fume content. For this reason, under the condition of a certain amount of silica fume, polycarboxylate superplasticizer can be added to reduce the water consumption of mixing, and polycarboxylate superplasticizer can also be added to increase the amount of silica fume under the condition of a certain amount of water consumption.
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