In the conference room, although some people were dozing off, Jin Xiaoya listened with great interest. Pen "Fun" Pavilion www.biquge.info

Li Ruoyu continued: "After the final setting of concrete, maintenance measures such as mulching, watering or film moisturizing should be taken in time, and the number of watering should be able to keep the concrete in a wet state, avoiding rapid evaporation of water, rapid temperature changes and external disturbances, and the moisturizing curing time of ready-mixed concrete shall not be less than 14 days." The concrete of the plane structure such as the bottom slab and the floor slab should be covered with appropriate materials and watered for maintenance, and the water should be stored and cured as much as possible when conditions permit; For columns with a large cross-sectional area, it is advisable to wrap a wet sack around a water spray for curing, or wrap a film around itself for curing or apply curing liquid. ”

"The concrete of the wall should be cured with a mold for 3 days, if necessary, the formwork on both sides can be loosened to form a gap of 3-5mm, and a spray pipe is erected on the top of the wall for spray curing, and after the formwork is removed, it should be covered with sacks or straw curtains on both sides of the wall for moisturizing and curing; The exterior wall of the basement should be backfilled as soon as possible. ”

"In addition, it should be noted that the curing of large-volume concrete should be carried out on the basis of moisturizing insulation or heat storage and water storage, and its covering thickness or water storage depth should be determined by pre-thermal calculation, and the wet curing time shall not be less than 14 days; And should be set up concrete temperature measuring hole or buried electric couple, the difference between the concrete center concrete and its surface temperature should be strictly controlled within the range of design requirements, when the design has no specific requirements, the temperature difference should not be greater than 25 °C. ”

"Similarly, impermeable and expanded concrete has extremely high requirements for curing, and water storage or wet sack curing should be used, and the curing time is not less than 14 days. Vertical structures such as basement exterior walls, shear walls, and columns are easy to lose moisture due to curing, and the side mold can be loosened 5-10mm after 24 hours, and then water is often poured from the top, so that water flows into the wet entire structure from the slab joint. Or use the method of hanging wet sacks for maintenance. ”

"Another one to remind the construction unit comrades, that is, the concrete setting time shall not be used as the basis for on-site demoulding, and the strength of the concrete specimen cured under the same conditions on site should be used as the basis for demoulding, and the concrete strength of the side formwork should be able to ensure that its surface and edges and corners are not damaged; The concrete strength of the bed mold and its support when dismantling should meet the design requirements, and when there are no specific requirements, it should meet the provisions of the formwork sub-project of the "Code for Acceptance of Construction Quality of Concrete Structure Engineering". ”

"For the dismantling of the load-bearing formwork, the conventional concrete supplied by our company can ensure that its 28-day strength can reach the design strength under the condition that the average temperature is not lower than 20 °C and normal maintenance, and there is a certain strength surplus. For the dismantling of the load-bearing formwork, the user can keep the specimen on the site for maintenance under the same conditions, and determine the demoulding time according to the structural span and the strength of the site. When the outside temperature is lower than 15 °C, the demoulding time should be extended due to the slow growth of strength. For those who need to dismantle the load-bearing formwork in 7 days or less, please contact our company to use early-strength concrete. ”

"For the removal of non-load-bearing formwork, our company's concrete generally ensures that the removal of non-load-bearing side formwork after 24 hours will not adversely affect the structure. However, when the outside temperature is lower than 15 °C, due to the prolongation of the coagulation time, the strength growth is slow, and the mold removal time should be appropriately extended. When the outside temperature is high, the mold can also be removed in advance according to the actual situation, so as not to damage the corners and appearance of the structure, but not earlier than 20 hours. When the strength grade is above C30 and the volume is large, the influence of heat of hydration should also be considered, and the mold can be removed when the temperature difference between the inside and outside of the structure does not exceed 25 °C. ”

"After the concrete is poured, it is necessary to avoid vibration, in the early stage of concrete hardening, the strength of the concrete is very low, and a small vibration may also cause damage to the inside of the concrete, causing visible cracks in the future, so it must be paid enough attention. During construction, the supporting formwork must have sufficient rigidity and is not easy to deform. The support of the pump pipe should not be able to pull the formwork, so as to avoid the vibration of the first poured part of the solidified concrete. The above process can not be too early, the steel bars and formwork of the floor surface can not be stacked too much, and the workers must be supervised to pay attention to handling gently. Please follow the above instructions and related specifications, if you do not follow the instructions and specifications for use and have a quality accident, our company will not be responsible for it. ”

Jin Xiaoya nodded and said: "That's for sure, if there is a quality problem because of construction, we will definitely not trouble the concrete company, after all, we also hope for long-term cooperation." ”

Speaking of this, Jin Xiaoya's tone aggravated: "Here I want to remind the comrades of our construction unit, now our owner found that there are non-standard behaviors on the construction site, we are for heavy punishment, you must know that our Julong real estate company, in the real estate market in the entire Shanghai City, the reputation is first-class, if because of the problem of which construction unit, resulting in the damage to the reputation of our company, we will increase the fine." Of course, I don't want that to happen, we want a good quality project. Okay, I'll just plug in this little bit, Mr. Li, please continue! ”

Li Ruoyu nodded and said: "Julong Real Estate Company, worthy of being a well-known developer in Shanghai, Miss Jin's words are indeed good!" We run a business not only to make money, but also to assume more social responsibilities. For example, the quality of our construction projects is related to the safety of people's lives and property, and we must not be careless. Think about it, if we spent ten or twenty years of savings to buy a house that is not of good quality, what would we think? Okay, without going into too much detail, I will talk about the last point, that is, the safety and civilization of the site, which is related to our vital interests. ”

"The site must cooperate with our company's on-site takeover, mainly responsible for the reinforcement of the pipeline, the erection of scaffolding, if there are potential safety hazards in the on-site takeover, the laying of the pipeline can be refused before the construction site is not excluded or promised by the construction site. Party A and the pipe should avoid cross-operation caused by potential safety hazards, if Party A's fasteners and steel pipes fall and cause Party B's personnel injury, Party A shall be responsible. Party B shall be responsible for the safety accident caused by Party B. Party B's on-site operators must obey Party A's management. ”

"During the pumping process, any personnel of Party A must stay away from the pipeline to avoid personal injury. It is not allowed to be on the discharge port, and Party B is not responsible for any personal injury. When Party A's personnel are pouring concrete, the operator must protect himself when pulling the hose to avoid the tower crane and the hose swinging and hurting people. In the event of a safety accident or other compensation in Party A's place, Party B shall immediately notify Party B's personnel to be present for identification, and Party B has the right to refuse to deal with it after the expiration date. ”

"If the on-site road does not meet the driving safety requirements of pump trucks and transport vehicles, our company has the right to refuse the supply of concrete. If the construction site forcibly requires our vehicles to walk, the site must make a safety commitment and be responsible for all losses arising therefrom. Finally, the matters not covered in this technical disclosure should be implemented in accordance with the relevant national, industry and local standards, norms and procedures. If you have any objection to this "Ready Mixed Concrete Production and Construction Application Technology Disclosure Minutes", please submit it in writing within 14 days. Thank you! (To be continued.) )