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2. Quality control of waterproof concrete construction
Combined with experience, from formwork design, fabrication and installation, assembling reinforcement, pouring and curing of concrete and other aspects construction technology of fair-faced concrete is introduced as well as quality control measures and standards in order to reduce engineering cost to acquire satisfied economic and social benefits.
Any links does not pay attention to the water-proof concrete of field loss hinders the water function without exception jointly with degree. Engineering construction in the basement adopts secondary form board fabrication and installation, reinforced bar fabrication and bind, concrete stirring and mixing system and transport, concrete co vibration beat with a stick, construction joint practice, concrete curing and dismantle model and being ready for backfill and so on aspects. These are very critical to quality method to ensure that water-proof concrete self water-proof, and the way of practice has wan out.
2.1 Fabrication and Installation
According to the concrete of closely knit, demand of reason why to form board since the water-proof also concrete have made and have assembled corresponding rise is special, be to require that not leaving out thick fluid, firm closely knit block of wood deformation, water absorption Character should be small and ought to give priority to select and using bamboo slab rubber form board or the steel form. Strict control form board room gap size, necessary exceeding 2 mms uses foam rubber or plastic to squeeze a crack in, porous form board nonutility without exception to board face Be ready for wall post at the same time rotting the prevention and cure job Adopt the cement mortar pouring same, indicia in before the root segment sticking the foam rubber or plastic strip , the bottom puts on a cement mortar , concrete a concrete, first 5 cm ~ 10 cm. Since water-proof, concrete structure wall thickness is mostly more infertile .Be to ensure that component geometry dimension , Chang adopt the inside and outside bolt to pull the measure meeting attention to, responds to on play receive bolt centre interpose stop water iron plate, to prevent water from forming pilot age passage along bolt leakage.
2.2 Assembling reinforcement
Water-proof concrete structure has demanding as follows to the reinforced bar.
1) reinforced bar should adopt twisted steel as far as possible , increases by hold wrap a force composing in reply a water ability
2) reinforced bars connect should try one's best to adopt to solder connection , stop using and being needless to bind connection to the full
3) strict control reinforced bars protective layer thickness.
Minimal thickness of water-proof concrete reinforced bar protective layer is not smaller than 25 mms, the protective layer welcoming water surface especially inadmissibility to disappoint error. The iron wire and reinforced bar that application buries in advance within mortar piece while using mortar heel block as protective layer, are bound solid .When the cavalry puts up the fixed reinforced bar if adopt a reinforced bar, Ying Jia also solders water iron plate or fixation just goes ahead, to strengthen water-proof effect in the heel block. This project uses new materials nylon to have fixed there is an effect's had guarded against reinforced bar protective layer deviation piece big mass common failings.
2.3 The concrete stirring and mixing makes and transports
Since the water-proof concrete requires that higher closely knit, reason why stir and mix system also need to have the fairly good homogeneity , should be ready for burning as follows almost for this purpose
1) Ensures that mixing time, mixing at every time are secondary jump into a expect the general ejection of compact block of wood less than 2 mins.
2) should use the apposition agent , the solution queen who should manufacture certain thickness from apposition agent adds the mixer inner, the dried powder or high concentration solution will add an agent extra not to adds the mixer inner directly ,prevent from mixing is uneven but part concentrates, both lose the apposition agent effect, and affect concrete mass.