Construction of concrete is important stages determine the quality of work , and monitoring the article below to know more about construction methods are being applied .
Mixing concrete by machine located at the site : [ / highlight ]Concrete for all structural works are mixed with concrete mixer 500lit placed at the scene .
Aggregate ( cement , sand , stone ) to the right by design – graded building contractors , inspection , Party A submitted for approval . Time enough for the material to be mixed well (about 2.5 minutes with mixer 500lit )
The order fill material into the mixer : First pour 15-20 % of water , then pour cement and aggregates at the same time , and gradually and continually pour rest of the water . When using additive blending the additives must follow the instructions of additive manufacturing .
In order to avoid mixing the concrete mixture into the mixing drum stick , just after 2 hours of work should flow into large aggregates and mixing tank of water and a rotary batch mixer for about 5 minutes , then sand and cement cement into the mix next time regulations .
Transporting materials : [ / highlight ]Concrete mixer pouring in spot will be transported by vertical hoists and winches , horizontal transport by carts , wheelbarrows .
The transporter must ensure that no segregation of concrete , sealed to ensure no water loss during transport cement .
Road transport must be convenient flat .
Before pouring concrete : check the shape , dimensions , clearances of formwork . Check reinforcement, exchanges , floor work . Preparing plywood for floor work .
The height of free fall of concrete shall not exceed 1.5 m – 2 m concrete to avoid segregation .
When pouring concrete in the order given , pour from far to near , from the inside out , starting from the lower front seat , poured in layers , then layer dress her class .
Use a table to the floor dress , vibrator for columns , beams and walls .
Thickness of concrete comply £ 16 TCVN4453 : 1995 to match the radius of effect of the dress .
Concrete must be poured continuously arbitrary constant , in each structural joints must be arranged in the position of cutting forces and bending moments small .
When it rains to shielding , no rain to fall on concrete . In the case of continuously poured concrete over the time limit specified in Table 18 TCVN 4453:1995 .
Concrete foundations were poured onto the pad just clean the hard earth .
Pouring concrete columns less than 5m in height and wall height less than 3m is poured continuously .
Column next smaller size 40cm , small wall thickness and hon15cm any column but have overlapping reinforced belt is poured continuously in each stage height of 1.5 m .
Column higher than 5m and 3m high wall should be divided into several stages , but must ensure that the location and structure of logical circuits suspension .
Concrete beams and slab are carried out simultaneously , the beam size larger than 80cm can be poured separately but must be arranged partial suspension of logical circuits .
Dam is concrete to make the concrete mixture is dense , not inside the pores , the outer surface is not porous , and stick to concrete reinforcement . Requirements of the dress is to dress carefully , and make sure not miss time , if the dress is not enough time , the concrete was not compacted , not hollow , hole . Conversely , if the dress is too long , concrete will loose out , big stones will settle down , will float to the top cement mortar , concrete will not be uniform .
For the floor , floor , roof , use the table to dress dress , dress right side when pulled slowly , the range of 5 – 10cm overlap . Dress in period 1 spot for 30 – 50s .
For columns , beams , use vibrator for compaction , each layer of concrete depth at about 30 – 50cm vibrator , vibrator moving distance not exceeding 1.5 effective radius of dress . Time dress for 20 – 40s . Attention during dress avoid distorting reinforcement .
concrete maintenance [/ highlight]Maintenance of concrete work that is done to provide adequate water for the hydration process of cement solidification process and hardening of concrete . In average conditions thuong.Ngay after 4 hours if the sun pouring have conducted surface covered to avoid ‘ white surface ‘ very concrete impact strength temperature of 15oC or higher, the first 7 days have frequent watering to keep moist , about 3 hours watering 1 time , 2 times at night at least , the day after watering 3 times a day . Irrigation water spraying ( spraying artificial rain ) , not watered directly to the new concrete surface solidification . Water used for maintenance , must satisfy the technical requirements as water mixing concrete . With the roof deck can be by building maintenance , water pump 1 for maintenance . During maintenance , not to white dry concrete surface .
Corporation Management Consultant CMC Professional Building design and construction of villas in Nha Trang application of quality management system ISO 9001:2008 ensure you bring a project like that , to ensure you are satisfied with us.
According to CMC synthesis
