On Monday, the California Highway Patrol announced that a portion of National Highway 84, also known as Nils Canyon Road, between Sunor and Fremont, has been closed due to a partial road collapse.
The Dublin office of the Center for Health Protection posted a photo of a collapsed road on social media before 7 am, and it is said that the eastbound Niles Canyon Road has been indefinitely closed.
The Center for Health Protection told drivers that on Monday, significant delays are expected on the main road between Interstate 680 and Interstate 238. The road damage has restricted traffic to one lane and is scheduled to be fully closed by 5 pm on Monday.
Part of the road that collapsed into the swollen Alameda Creek runs eastward along the Nils Canyon east of Palomares Road in the unmerged Alameda County.
Shortly after the comprehensive closure, the Center for Health Protection said that Niles Canyon Road would be closed for at least the next few days as California transportation companies evaluate the road’s condition and maintenance plans. Drivers are required to wait and find alternative routes to avoid the road patiently.
There are many types of concrete admixtures, and each type has different effects.
Air-entraining agent: Air-entraining agent can introduce an appropriate amount of stable bubbles during the concrete mixing process, thereby improving the durability of the concrete. It is mainly used in projects with anti-mixing and anti-freezing requirements.
Retarder: Retarder can extend the hardening time and hydration time of the cement contained in concrete, reduce the hydration heat generated in the early stage of concrete, avoid concrete cracking, and prevent construction joints in concrete due to continuous pouring. In addition, it can also maintain good workability of concrete constructed at high temperatures and extend the release time of hydration heat to avoid surface cracks.
Early strength agent: Early strength agent can shorten the setting time of cement contained in concrete. It suits steam curing, prefabricated components, and concrete projects with low temperature and early strength requirements. It can improve the early strength of concrete, speed up construction progress, and shorten the time of concrete Construction and maintenance time.
Water-reducing agent: Water-reducing agent can reduce the amount of cement contained in concrete, has a relatively high water-reducing rate, can effectively reduce the loss of concrete slump, increase the filling and pumpability of concrete, and reduce equipment and Operational effects to maintain the stability of concrete.
In addition, other types of concrete admixtures, such as composite expansion agents, waterproofing agents, and rust inhibitors, are used for different purposes, such as improving the early strength and impermeability of concrete and preventing corrosion of steel bars.
(Concrete)
When selecting concrete admixtures, the correct choice should be made based on the actual construction environment, construction needs, etc., to ensure the best improvement in concrete performance. At the same time, when using concrete admixtures, they need to be evenly mixed with the concrete in the correct proportion to ensure that the admixture can fully exert its effect.
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