Polymer self-adhesive waterproof membrane
The construction quality of waterproof engineering directly affects the use of buildings, even the structural safety. With the development of construction technology, the construction quality and environmental protection requirements for building waterproofing are becoming higher and higher. It is necessary to select more excellent waterproofing materials and adopt advanced construction techniques to ensure the waterproofing effect and structural safety of the building.
Self-adhesive waterproof membrane is a new type of waterproof material. Compared with similar materials, it has the advantages of simple construction, good waterproof performance, and environmental protection. With the gradual popularization and application of self-adhesive waterproof membranes, continuous exploration and improvement in the construction. Summarizing this construction technology, we have formed a self-adhesive waterproof membrane construction method.
2 Construction method features
Compared with ordinary waterproof materials, self-adhesive waterproof membrane has the following characteristics:
2.1 Cold construction at room temperature, no hot melt required. As long as the separation paper is peeled off during construction, it can be directly paved, which is extremely convenient for construction and can effectively shorten the construction period;
2.2 With high tear strength, it can effectively resist the damage to the waterproof system caused by the stress of cracking and deformation of the base;
2.3 Very high resistance to penetration and impact;
2.4 Excellent adhesion guarantees the continuity and sealing of the lap seam of the coiled material;
2.5 High and low temperature resistance, anti-aging, long service life.
2.6 In terms of construction method, this construction method has the following characteristics:
2.6.1 The construction process is complete and simple, with strong operability and low labor intensity;
2.6.2 The construction speed is fast and the work efficiency is high, which can ensure the construction period;
2.6.3 The construction quality is easily guaranteed and can meet the higher waterproof requirements.
3 Scope of application
Polymer self-adhesive waterproof membrane can be applied to general industrial and civil buildings and other waterproof projects that have high requirements for waterproof performance.
It can be used for waterproofing and dampproofing of various parts of underground buildings (including basement floor, elevator shaft, basement exterior wall, basement roof, etc.) as well as roof, podium, balcony (terrace) and toilet.
4 Process principle
The polymer self-adhesive waterproof membrane is based on elastomeric asphalt such as SBS as the base material, polyester tire base as the carcass, polyethylene film and aluminum foil as the surface material or no film (double-sided self-adhesive), using anti-sticking isolation Layer of self-adhesive waterproof membrane. The waterproof coiled material has super strong bonding strength, and the special rubber self-adhesive layer can ensure the bonding and sealing of the coiled material and the base layer, the coiled material and the coiled material, and form an integral sealed waterproof layer. It has good resistance to acid and alkali corrosion and other chemical media. The surface of the self-adhesive membrane has HDPE, which has high tear strength, meets the requirements of puncture resistance, and can effectively resist the damage to the waterproof system caused by the stress caused by the cracking and deformation of the base layer.
5 Process flow and operation points
5.1 Basic level requirements:
5.1.1 The waterproof base layer must be flat and firm, without protruding sharp corners, pits and surface sanding phenomenon, the surface should be clean and dry, and the corners should be rounded with a radius of 50mm according to the requirements.
5.1.2 The water content of the base layer should be free of bright water drops.
5.1.3 Before construction of the waterproof layer, dust, sand, gravel, debris, oil stains and mortar protrusions on the base layer must be removed.
5.2 Construction preparation:
5.2.1 Construction tools for cleaning waterproof base: shovel, broom, dust blower (or vacuum cleaner), hand hammer, steel chisel, rag, etc.
5.2.2 Construction tools for roll paving: scissors, tape measure, spring box, roller brush, rubber roller, etc.
5.2.3 The temperature during construction should be above 5 ℃, and it is not suitable for construction in a particularly humid and unventilated environment. The construction site should have good ventilation conditions.
5.3 Process flow:
Surface cleaning and repairing of the base layer → Brushing the supporting base treatment agent → paste the node parts → positioning, elastic reference line → spread self-adhesive rubber waterproof membrane → rolling, exhausting → closing treatment and lap joint → organization acceptance → protection Layer construction.
5.4 Operation points:
5.4.1 The overall laying order of the coiled material is: high-span first, then low-span; the same height, first far and then near; the same elevation, starting from high to low.
5.4.2 Priming: After the base surface is cleaned and accepted, pass the special base treatment agent evenly on the surface of the base layer. The brushing should be carried out in one direction, with uniform thickness, no bottom leakage or accumulation, and let it dry until touch Not sticky.
5.4.3 Bounce line and trial laying: paste the control line on the base coat according to the actual lap area, strictly follow the trial control line and the actual bonding of the coiled material to ensure that the lap width of the coil is 6-7cm (roll There are signs on the wood). According to the characteristics of the site, determine the density of the elastic thread, so as to ensure that the coil is pasted straight, and the pasting phenomenon will not occur due to the cumulative error. The roll material should be laid in trial first, and the shape should be cut according to the requirements before the actual gluing can be started.
5.4.4 Node processing:
188.8.131.52 Closing treatment of the parapet wall part: when making cement mortar, the negative corner of the junction between the wall and the roof should be smeared into a small round corner with a radius of about 50mm. After the base surface meets the requirements, first apply a polyurethane waterproof layer, and evenly apply Immediately afterwards, a layer of carcass reinforcement (glass fiber cloth) is applied, and then a second polyurethane waterproof layer is applied, which is firmly bonded to the base surface, and is also convenient for the construction of self-adhesive coiled material.
184.108.40.206 Treatment of Yin-Yang corner and nozzle area: Yin-Yang corner must be made into 50mm rounded corners with mortar, additional waterproof additional layer is added, and glass fiber cloth is provided in the additional layer. At the junction of the nozzle and the base surface, after the leveling layer is wiped out, the groove is reserved, the sealing material is embedded, and then the rust and polish are added around the pipe. A waterproof additional layer is provided within 500mm around the nozzle part, and glass fiber is added Cloth together to ensure a comprehensive waterproof effect.
5.4.5 Large area paving rolls:
Large-area self-adhesive coiled materials are mainly divided into two types: the pavement method and the roll-laying method. In actual construction, the construction personnel can determine the paste method according to the site environment, temperature and other conditions, but the basic exhaust, compaction, prevention Wrinkle requirements are still the same.
220.127.116.11 Basic requirements: When sticking the roll material, you should always align with the baseline to avoid deviations that are difficult to correct. When laying the coiled material, the coiled material shall not be forcibly stretched. After pasting, immediately use the pressure roller to roll from the middle of the coil to both sides to expel the air, so that the coil is firmly adhered to the base layer. Do not remove the separator paper at the overlapping part of the back of the coil prematurely, so as not to pollute the adhesive layer or Sticky by mistake.
18.104.22.168 Pulling and spreading method: lay the roll material in full width with the reference line, lift the roll material (along with separator paper) from one end, fold in half along the long center line of the roll material sheet, and gently cut the edge of the separator paper with a paper knife Open, take care not to scratch the roll, carefully tear the separator paper from the back of the roll for a short length of about 500mm, and the two men work together to peel off the separator paper and align it with the reference line for sticking and positioning. First roll the half-length roll in place, pull the peeled release paper evenly and pull it back slowly, slowly pull out the remaining half-length release paper, and pay attention to the integrity of the pulled release paper when spreading If you find any tears or breaks, you should stop the spreading immediately, and clean up the torn separator paper, and then continue spreading.
22.214.171.124 Rolling and spreading method: that is, peeling off the release paper and spreading the roll material at the same time. There is no need to open the entire coil during construction, insert a steel tube into the paper core tube in the center of the coil, and then lift the end of the steel tube to the beginning of the position to be laid by two people, and display the coil forward About 500mm, another person peels off this part of the roll of separator paper and rolls it onto the used packaging paper core. Align the strip of peeled release paper with the baseline that has been sprung gently, and then compact it. After the initial end is laid, one person slowly lifts the peeling paper and rolls it onto the above paper core tube, and moves forward. The two people carrying the roll are along the baseline
Roll the roll forward. Note that the moving speed of the two people who carry the coil must be the same and coordinated. The roll should not be too slack; after paving a roll, use a long handle to brush, starting from the beginning, completely remove the air under the roll, and then use a large pressure roller or a hand-held portable vibrator to press the roll Really, firmly pasted.
126.96.36.199 Paving on the elevation and slope: Since the adhesion between the self-adhesive coil and the base is relatively low, on the elevation or slope, the coil is prone to slippage. When sticking on a large slope, it is advisable to use a hand-held gasoline torch to properly heat the adhesive on the bottom of the coil before sticking, venting, or rolling.
188.8.131.52 After exhausting and compacting the large-area coil, use a small hand-held roller to roll the overlapped part, roll it outward from the inner edge of the overlap, discharge the air, and stick it firmly.
184.108.40.206 Seam sticking and sealing:
Coil lap sealing: the short side lap joint of the coil, the coil end, the pipe wrap, and the special-shaped part should be sealed with a special sealing paste for self-adhesive rubber asphalt waterproof coil. The sealing width of the overlapping edge is not less than 10cm.
220.127.116.11 When the waterproof layer is made of two layers, the overlapping edge of the second layer should be staggered from the first layer to avoid overlapping of the joints and prevent local water leakage.
5.4.6 Fixed and closed head:
The ends of the four sides of the coil material end into the groove (trapezoidal groove 20mm deep × 40mm ~ 60mm high), the metal bead nails are firm, and sealed with a special edge-sealing paste.
18.104.22.168 The short-side joints of two adjacent rows of coils should be staggered by more than 300mm from each other, so as not to overlap the multilayer joints and make the coils stick unevenly. The waterproof area is very large, and when it is necessary to construct in stages, there are many temporary endings in the intermediate process, and special sealing paste should be used for temporary closure.
22.214.171.124 After the roll material is pasted, measures should be taken to temporarily cover it to reduce the chance of direct exposure to the roll material and damage. The peeled off silicone insulation paper is reversed on the roll material, and this protective paper can also be used as a separation layer between the waterproof layer and the protective layer and continue to be retained.
126.96.36.199 After pasting, it may appear slight surface wrinkles and blisters when exposed to the sun. This is normal and will not affect its waterproof performance, and will disappear once concealed.
188.8.131.52 The waterproof layer should be concealed as soon as possible, and should not be exposed for a long time. Normally, it should be concealed within 24 hours after the waterproof layer is completed. If there is a water shut-off test, the concealment time should start from the end of the water shut-off test.
The characteristic of polymer self-adhesive waterproof membrane is full bonding with the base layer, even if there is local damage, it will not pass water, so it is important to ensure the quality of full bonding. Because the characteristic of the coiled material is self-adhesive, the "advanced" bonding phenomenon is easy to occur during the operation, that is, the coiled separator paper is already bonded when it is opened on the base surface, and it often shows uneven spreading and blistering. To this end, the following matters must be paid special attention:
5.5.1 When sticking rolls, pay attention to the alignment with the reference line at any time to avoid deviations that are difficult to correct. When the roll material is pasted, the roll material must not be forcibly stretched. After pasting, the roller is then rolled from the middle of the coil to both sides to expel air, so that the coil is firmly adhered to the base layer. Do not peel off the separator paper at the overlapping part on the back of the coil prematurely, so as not to contaminate the adhesive layer or stick it by mistake. It should be removed before the back web is pasted.
5.5.2 The base layer must be cleaned. If the base surface is not strong, it will cause the phenomenon of pulling up the attachments on the surface of the coil and the base layer, so the base layer must be firm and clean.
5.6 Measures to deal with common problems:
5.6.1 Bubbles, hollow drums:
Because the base layer is wet, the leveling layer is not dry, and the moisture content is too large, the coating film is swollen and bubbles are formed. Treatment method: First cut off all the bulging parts to expose the base layer and discharge moisture. After the base layer is dry, repair it according to the construction method of the waterproof layer.
The phenomenon that the edge of the waterproof layer or the end of the waterproof layer peels off with the base layer is mainly because the base layer is not treated well, is not clean or dry, and the sealing treatment at the end is not good. Care should be taken during construction. Drainage should be done during detailed construction to prevent construction with water. Construction should not be carried out on rainy days. The base layer should be kept dry. For the waterproof layer that has warped edges, the peeled edge should be separated first Clean it, and then select the primer with strong adhesion according to the material of the base layer to scratch the base layer, and then make a waterproof layer.
After the construction of the waterproof layer and before curing, without protection, it was damaged or scratched by the construction of other processes. For those with serious damage, the damaged part should be divided (a little larger), the base layer should be exposed and cleaned up, and then the waterproof layer should be made up in layers according to the construction requirements and sequence.
The outer packaging of the coil shall indicate the manufacturer's name, trademark, product mark, production date, batch number, storage and transportation icon mark, etc.
The coiled material should have a roll core and be packed in sticky tape or paper or box.
Coiled material should be stored in a dry and ventilated environment to prevent sun and rain. Coils of different types and specifications should be stacked separately. The coiled material should be laid flat, and the stacking height should not exceed 5 layers.
Note: Copyright belongs to Shandong Huiyuan Building Materials Group Co., Ltd., declined to reprint! !