The Basic Principles Of Concrete
social act. Từ Cambridge English Corpus The actual explanation (in contrast to bare description) of situations rests in the powers and liabilities of your concrete
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Once the aggregates, drinking water, along with the cement are combined, the mixture remains in the fluid affliction for approximately 4 to six hours which permits transporting, placing and ending in its final area, then the mixture starts to harden. All portland cements are hydraulic cements that established and harden by way of a chemical reaction with drinking water. In the course of this reaction, called hydration, crystals radiate outwards from cement grains and mesh with other adjacent crystals or adheres to adjacent aggregates.
该例句来自Hansard存档。包含以下议会许可信息开放议会许可v3.0 Will this sort of projections actually deliver the only real justification for concreting over our eco-friendly spaces? 来自 Hansard archive
該例句來自Hansard存檔。包含以下議會許可信息開放議會許可v3.0 Doubtless it can be time to illustrate these abstract concerns with a concrete
This could lead on into a waste of scarce Uncooked supplies including slag and fly ash. The intention of other study routines is the efficient utilization of cement and reactive resources like slag and fly ash in concrete determined by a modified mix layout solution.[139]
Yet another popular effect for flooring and table tops is polished concrete exactly where the concrete is polished optically flat with diamond abrasives and sealed with polymers or other sealants.
Supplemental popular curing techniques incorporate damp burlap and plastic sheeting covering the clean concrete.
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We've a basic notion of what we wish, but nothing concrete at this time. 我們對需要甚麽有個大致的想法，可是具體的東西目前還沒有想好。 反義詞
Drinking water operates through the voids in the pavement on the soil underneath. Air entrainment Hancock Concrete Contractor admixtures in many cases are Employed in freeze-thaw climates to attenuate the potential for frost harm. Pervious concrete also permits rainwater to filter as a result of Concrete Contractor In Sioux Falls roads and parking loads, to recharge aquifers, as an alternative to contributing to runoff and flooding.[91]
In pre-tensioned concrete, the prestressing is realized by utilizing steel or polymer tendons or bars which are subjected into a tensile pressure ahead of casting, or for post-tensioned concrete, right after casting.
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