Conclusions

 Construction temperature and relation of crack in concrete the above carry on preliminary discussion of theory and practice, though the academia has different theories to origin cause of formation and computing technology of the concrete crack, but to concrete prevention and improving the measure suggestion to relatively unify , application in practice result fine too at the same time, concrete to is it observe , compare more more by us to want in constructing, analyse more , summarize more after going wrong , combine many kinds of prevention and deal with the measure, the crack of the concrete can be avoided. 

2. Quality control of waterproof concrete construction

Combined with experience, from form work design, fabrication and installation, assembing reinforoement, 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.

  The factors of influening waterproof- concrete quality are very many 

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 concrete covibration beat with a stick, construction joint practice, concrete curing and dismantle model and beingready 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.

 3.Method being under construction

2.1 Fabrication and Installation

According to the concrett 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 pilotage passage along bolt leakage.

2.2 Assembing reinforoement

   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) when binding a reinforced bar, the iron wire head responds to inner bending.

4) 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