Construction of I-Building, I-Process, and High Performance Composite Insulation Materials in Shaped Roof Projects Wang Yadong (Department of Civil Engineering, Harbin University, Harbin 150000, China) Shanghai Jinqiu California Garden is a large-scale residential community invested by Hong Kong Far East Development Co., Ltd. Its largest architectural feature is the introduction of California villas in the United States, using a unique form of romantic roof (round arched roof). However, this has brought a lot of trouble to the construction of the roof insulation layer, and put forward higher requirements for the thermal performance, durability and economical efficiency of the insulation material.
1 The project is divided into 4 phases. The scheme adopted for roof insulation is: 10cm thick ordinary concrete + 2cm thick mortar + 5cm thick perlite insulation board + 2.5cm thick mortar. The disadvantages of this program are: poor durability of insulation materials; complex construction procedures; construction speed is too slow; thermal insulation coefficient of insulation materials is relatively small (only 0.75m2.K/W), failing to reach the “New Wall of Shanghai†The Provisional Regulations on the Thermal Engineering Design for Energy-Saving Residential Buildings in the Pilot Area of ​​the Materials Regulations for the Thermal Performance of Roof Insulation Materials (The specification requires that the thermal insulation coefficient of the roof insulation material is not less than 0.91, phantom).
2 The test and development of high-performance composite roof insulation materials and the new achievements in polymer insulation materials and concrete technology, especially considering that ceramsite concrete has the advantages of light weight, heat preservation, durability, and good nailability, we have found that Molecular insulation material board ten high-performance ceramic concrete technology line can achieve the specifications of the roof insulation materials, technical requirements, and can increase the construction schedule, and achieve good economic benefits.
2.1 Test raw materials and their properties 2.1.1 Polymer heat-insulating material plates: Customized according to the characteristics of special-shaped roofs, dimensions and roofing engineering requirements for thermal insulation coefficient of thermal insulation layer in a chemical plant. This material has a density of 20 kg/m3, a thermal conductivity of 0.04 lW/(mK), a water absorption of 3%, good water resistance, and a certain degree of plasticity and strength.
2.1.2 Ceramsite: clay ceramsite produced in Changzhou. The cylinder compressive strength is 4.3MPa, the bulk density is 525kg/m3, the apparent density of the particles is SSakg/m3, the porosity is 41%, and the water absorption rate is 8.2%. 2.1.3 Fine Aggregate (A material): To improve economy Sex, and implement the relevant policies of the Shanghai Municipal Government on the comprehensive utilization of industrial waste, choose an industrial waste residue instead of clay sand. This kind of waste slag is not ideal except that the particle size distribution is not ideal, and other properties all meet the requirements for light and fine aggregates in the Technical Regulations for Light-weight Aggregate Concrete (JGJ51-90).
2.1.4 Cement: Shanghai cement plant produces 425 slag Portland cement.
2.1.5 Admixture (B material): A fine industrial waste powder. The proper amount of incorporation can improve the construction performance and durability of ceramsite concrete, and in particular it can increase the consistency of concrete mixes.
wire.
2.1.7 Special fiber (C material): The proper amount of incorporation can significantly increase the tensile strength of the ceramsite concrete and prevent the occurrence of cracks in the structural catastrophic parts.
2.1.8 Superplasticizer (D material): An air-entraining type naphthalene superplasticizer.
2.2 Development of high-performance composite thermal insulation materials 2.2.1 Composition of high-performance composite thermal insulation layer Refer to the “Provisional Regulations for Thermal Engineering Design of Energy-Saving Residential Buildings in the Pilot Area of ​​New-Type Wall Materials in Shanghai†to stipulate the thermal performance of roof insulation materials, and then The requirements of the construction unit and the properties of the materials we have selected put forward the high-performance composite thermal insulation material composition plan as follows: 5cm thick polymer material insulation board + 3.5cm thick high-performance ceramic ceramsite, in which the preparation of high-performance ceramic ceramsite is The essential.
The technical requirements for the preparation of high-performance ceramsite concrete for ceramsite concrete 28d compressive strength of CL15 grade, dry density not more than 1250kg/m3, ceramsite concrete roof can not crack, special-shaped adobe concrete construction does not use template.
Formulation of High-Performance Ceramsite Coagulation Jinqiu California Garden adopts a “round-arched†roofing type. This type of roofing has a large gradient, a structural change, and a thin layer of ceramsite concrete. Requirements, put forward new requirements for blending ratio juice. The above-mentioned goals cannot be achieved for ceramsite concrete (ES-1) designed in accordance with JG51-90. For this purpose, we use the results of modern high-performance concrete and fiber concrete technology for optimal design and Repeated trials were carried out to prepare two sets of high-performance ceramsite concrete code-named ES-2 and ES-3 (used for structural mutation sites) to meet the engineering requirements.
In order to test and evaluate the designed construction plan and the developed high-performance composite roof insulation material, a pilot study of the prototype project was conducted. The size and shape of the model project are exactly the same as those of the actual house type. After the roof structure of the sample project is cast and cured to the specified age, the insulation layer is tested on the structural layer. The content of the experimental study is divided into three parts: a. Comprehensive analysis of the operability of the construction program, work efficiency, and the impact on the project quality, etc., and improve and perfect it.
The construction of the roof insulation layer was completed according to the on-site construction conditions and the relevant properties were determined.
From the technical and economic aspects of the new and old roof insulation program to conduct a comparative study.
According to the actual construction operation sequence, the construction scheme was designed. Through the research on the problems encountered in the field construction, and considering the influence of the construction process on the performance of the insulation material, the scheme was supplemented and improved. The final adoption scheme was as follows: using special materials and Special process and high-efficiency idle fixed insulation board, insulation board staggered joint arrangement, can prevent cracking and adding ceram concrete speed; add cold drawn steel wire on the insulation board, and make the cold drawing steel wire from the insulation board up 3cm, fixed Cold-drawing steel mesh to form a whole with the insulation board can improve the construction quality; pre-wetting the ceramic particles strictly according to the specifications, strictly controlling the sand rate and the amount of admixture, pouring according to the specifications and the mixing ratio developed by us. Ceramsite concrete; sprinkled water for 48 days after curing for 14 days. 2.3.2 Comparative study of new and old roof insulation solutions The new roof insulation plan was: 10cm thick ordinary concrete (1st floor) + 5cm thick polymer insulation board (2nd floor) +3.5cm thick high performance ceramic concrete (3rd floor). The durability of new and old insulation solutions has been confirmed by practice and research. Therefore, the thermal performance and economic performance of these two insulation solutions are mainly compared and studied.
3.1 The project adopts a new insulation program, which has achieved good technical and economic results for the roof insulation project of Shanghai Jinqiu California Garden Phase II.
3.2 The preparation of ceramsite concrete that meets the needs of the project is the key to the implementation of the new insulation program. To this end, the relevant achievements and conclusions of high-performance concrete must be referenced.
3.3 The inspection, improvement and evaluation of the construction process and insulation material preparation scheme through the sample project is a very effective research method for the application of housing construction.
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