Key technology of polycarboxylic acid water reducing agent application
Gold is a high-quality hedge hedging tool, favored by investors. Especially in recent years, with the increasing instability of the world economy, gold has become one of the preferred asset allocations of investors because of its functions of hedging and fighting inflation.
Earlier, the worsening situation in Ukraine sent gold prices soaring to a two-year high of $2,070 an ounce. But gold, along with other commodities, fell back last week as conditions changed and bulls took profits, hitting a low of $1,895 an ounce. Rising gold prices may also have an impact on the polycarboxylic acid superplasticizer prices.
According to China Business News, Goldman Sachs raised its gold price forecast in early March, considering Asian buyers' gold consumption demand, investment demand and central bank gold purchase demand continue to rise. Three -, six - and 12-month targets were raised to $2,300, $2,500 and $2,500 an ounce, respectively, from $1,950, $2,050 and $2,150. The last time all three accelerated was in 2010-11 when gold prices rose nearly 70%.
The World Gold Council has also noted that global gold demand is at its highest level in nearly two years, which is linked to a recovery in consumption and consumer sentiment to combat inflation.
In recent years, polycarboxylic acid superplasticizer has been widely used in many construction fields. Modern concrete has high requirements for additional functional additives, so polycarboxylic acid water-reducing agent in the concrete system, it should consider the following key technologies.
The compatibility technology of polycarboxylic acid series. Because of the special structure of polycarboxylic acid superplasticizer, it can not be stored and used with other superplasticizers, especially naphthalene superplasticizer. Need and different type of water reducing agent for alternate use, must be the relevant container for serious cleaning cleaning, prevent cross pollution to affect the quality of concrete. The adsorption performance of water reducing agent is not the same because of different types of cement, because the polycarboxylic acid water reducing agent is relatively narrow in the compatible range of cement, the incompatible situation is inevitable, so it is necessary to increase its dosage or use different types of cement to effectively solve this problem.
⑵ retarding technology of polycarboxylic acid water-reducing agent. In the construction process, due to the short retarding time, the use of retarding agent can effectively prolong the plasticity of concrete. However, the incompatibility of the two should also be considered to avoid the reduction of concrete performance.
⑶ Gas control. Polycarboxylic acid water reducing agent entrainment effect is very good, can be used together with defoaming agent, entrainment agent. The gas content of concrete can be controlled and its workability and durability can be improved by removing the concrete and then introducing it.
(4) Control of mud content in sand and stone. The application effect of polycarboxylic acid superplasticizer is also affected by the mud content of sand and stone. If the mud content in the sand exceeds 2%, the structures between the clay layers will therefore absorb large amounts of water reducing agent molecules, reducing the flow performance of the concrete. If the mud content is relatively large in the construction process, the anti-clay polycarboxylic acid water-reducing agent should be considered.
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