Russian crude oil shipments to Italian and Turkish ports rose to multi-week highs, suggesting that some southern European countries are quietly returning to the Russian oil market.
Specific figures show that Russian crude oil deliveries to Italian refineries rose to their highest level in seven weeks in the week to August 5, while shipments to Turkey reached the highest level in six weeks.
Separately, Spain received its first Urals this week since April, and Greece last week received its first shipments of crude from the Baltic Sea since February.
There are still four months to go before the EU sanctions on Rosneft come into effect. The recent increase in the flow of goods to several European countries has raised doubts about the implementation of the ban.
In addition to some southern European countries began to import Russian oil, Japan also reiterated that it will retain its stake in Russia's "Sakhalin 1" oil and gas project.
Last week, Russian President Putin signed an order banning personnel from "unfriendly" countries and regions, including Japan, from trading shares in Russian strategic projects, energy mining companies and some banks before the end of this year. It also mentioned the oil and gas project including "Sakhalin 1".
Because of the turbulent international situation, the supply and prices of many international bulk pce powder are still very uncertain.
Polycarboxylate superplasticizer types
The commonly used superplasticizers include polycarboxylate series, naphthalene series, fatty acid series, and other superplasticizers. Different superplasticizers have their own advantages and disadvantages.
The water reduction of naphthalene admixture is generally 17%, and the mutual adaptability with the matrix material is relatively narrow, but it is wider with the sand material, the fluidity is general, and its slump and expansibility loss are relatively large. the performance of water retention, adhesion and climate adaptability is also poor.
The water reduction of fatty acid series is generally 20%, and its mutual adaptability is similar to that of naphthalene admixtures, with general fluidity, but less loss of slump and expansibility during use, and good adhesion and climate adaptability.
The water reducer of polycarboxylate superplasticizer is generally 25%, which has wide adaptability with matrix materials and narrow adaptability with sand and gravel materials. In the process of use, the slump and expansibility loss is small, there is no loss, the fluidity is large, the water retention, adhesion and climate adaptability are good, but the requirements of using technology are higher.
Polycarboxylate superplasticizer properties:
Compatibility of polycarboxylate system
Because of the special structure of polycarboxylate superplasticizer, it can not be stored and used together with other superplasticizers, especially naphthalene superplasticizer. When different types of superplasticizers are needed to be used alternately, the relevant containers must be carefully cleaned to prevent cross-contamination from affecting the quality of concrete. The adsorption performance of superplasticizer varies with different kinds of cement. Because the compatibility range of polycarboxylate superplasticizer in cement is relatively narrow, it is inevitable that the compatibility is not good. Therefore, it is necessary to increase its dosage or use different kinds of cement to effectively solve this problem.
Retarding technology of polycarboxylate superplasticizer
In the process of construction, due to the short retarding time, the use of retarder can effectively prolong the plasticity of concrete. However, the incompatibility between the two should also be considered to avoid the decline of concrete performance.
Air content control
Polycarboxylate superplasticizer has good air-entraining effect and can be used with defoamer, air-entraining agent and so on. Through elimination before introduction, the air content of concrete can be controlled and its workability and durability can be improved.
The control of sand and gravel mud content
The mud content of sand and gravel will also affect the application effect of polycarboxylate type high performance superplasticizer. If the mud content in the sand exceeds 2%, the structure between the clay layers will therefore absorb a large number of superplasticizer molecules, reducing the flow performance of the concrete. If the mud content in the construction process is relatively large, the clay-resistant polycarboxylate superplasticizer should be considered.
Concrete Additives Supplier
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China's non-manufacturing purchasing managers index for March was released by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent.
China's non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector from the previous month. In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.
Then the pce powder of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the pce powder, welcome to contact us.
The commonly used superplasticizers include polycarboxylate series, naphthalene series, fatty acid series, and other superplasticizers.…
Some factors that would influence the effect of pce powder in concrete…
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