Study On The Interaction Of Foam-in-place Thermal Insulation With Masonry And Its Pouring Height

In our country, the building energy consumption is higher than developed country, themain reason is that the buildings’ envelope and the operating conditions of heating system ispoor. Therefore, The significance of building’s energy conservation is very important and theheat preservation of exterior wall is the keypoint. In China the mature and widely used heatpreservation technique is the outside heat preservation techniques to exterior walls. However,the durability of this heat preservation form has serious problem. It can’t ensure the25yearsservice life under the normal use and maintenance. The construction of traditional cavity wallis complicated and the construction period is long. During the construction process, the heatpreservation cavity can’t be fully filled. The foam-in-place cavity wall is that the cavity isfilled with foam-in-place thermal insulation mortar after buildinging the interior and exteriorwall. With this technique, we can ignore the filling gaps. The construction will be economical,simple, speedy. Compareed with traditional cavity wall, foam-in-place thermal insulationmortar has good compressive strength and plays an important part in coordinating the internaland external wall work together. Morever., it also has beneficial effects on seismic capabilityand shear behaviors of the wall. During the construction process, the foam-in-place thermalinsulation mortar produces lateral compression on the wall. Accoeding to this, the pouringtime and pouring height of foam-in-place thermal insulation mortar need to be intensiveresearched. In order to research the interaction between foam-in-place thermal insulationmortar and masonry, a series of experiments were carried out and the test result of thefoam-in-place thermal insulation mortar and taditional thermal insulation material werecompared and analysed. In order to research the pouring time and pouring height, the mainfactors which affect the level shear behaviors of the wall such as steel ties and mortar jiontwere researched. The pouring height with different mortar strength or different curing timewas theoretically analysed. The main work are as follows:In order to research the interaction of foam-in-place thermal insulation mortar withmasonry,so the writer carried out a series of related experimentswere, included compressionexperiments,shear properties experiments and bond properties experiments.The averagecompression strength of foam-in-place thermal insulation mortar is2.65times higher than theEPS board and1.39times higher than the XPS board. The shearing force of foam-in-placethermal insulation is above5%than the civity wall, it has beneficial effects on the seismiccapacity of masonry.In order to research impacts of the plastics steel ties and mortar joint to hoizontal shearcapacity of wall, a series of related experiments were carried out, included pull tests ofplastics steel ties, shear test of of mortar joint.The result of test show that although the plastic change the force performance of steel ties, the force performance of the plastics steel ties isgood, the U-shape one has better mechanical performance than L-shape; that hoizontal shearcapacity of specimens made with sintered porous brick is higher than specimens made withnormal blocks，the reason is” pin key” can enhance the shear capacity of specimens; theshear capacity of vertical specimens made with normal blocks is higher than that ofspecimens made with sintered porous brick, the reason is the mortar in groove can enhancethe shear capacity of vertical specimens.In order to consider the pouring height and casting time of foam-in-place thermalinsulation mortar, fristly determine the destruction form of external wall with differentnumbers of plastics steel ties,then carry out comparative analysis between load and structureresistance. The results show that when the layout space of plastics steel ties is800×400, thestrength grade of mortar is M5, conserve two days can cast one floor,four days can cast twofloor, seven days can cast three floor,15days can cast four floor,28days can cast five floor,the strength grade of mortar reach M2.5can cast four floor, reach M5can cast five floor,reach M7.5can cast nine floor, reach M10can cast ten floor; when the layout space of plasticssteel ties is800×300, the strength grade of mortar is M5, conserve one days can cast onefloor,three days can cast two floor, six days can cast three floor,15days can cast five floor,28days can cast six floor, the strength grade of mortar reach M2.5can cast five floor, reach M5can cast six floor, reach M7.5can cast ten floor, reach M10can cast twelve floor; when thelayout space of plastics steel ties is600×400, the strength grade of mortar is M5, conserveone days can cast one floor, four days can cast two floor, seven days can cast three floor,15days can cast four floor,28days can cast five floor, the strength grade of mortar reach M2.5can cast four floor, reach M5can cast five floor, reach M7.5can cast nine floor, reach M10can cast ten floor.