Frequently Asked Questions 1
After the hot melt coil is spread and pasted, empty drum is produced
1. Cause analysis:
(1) The base is wet, and the asphalt cementing material is poorly bonded to the base;
(2) Due to the influence of personnel moving around or other processes, the surface of the screed layer is stained with mud and water, and the base is poorly bonded;
(3) The paving and pasting of vertical wall rolls are difficult to operate, and hot operation is easy to cause inaccurate and lax paving and pasting.
2. Solution:
(1) The water table shall be lowered to not less than 500mm below the cushion. A 1:2.5 cement mortar screed layer should be applied on the cushion to create a good surface of the base, while preventing moisture from the base due to the rise of capillary water;
(2) Keep the screed surface dry and clean. If necessary, scrub and air dry should be taken before laying and pasting the coil;
(3) One to two days before spreading the coil, spray or brush 1 to 2 lines of cold bottom oil to ensure that the coil is bonded to the surface of the base.
Frequently Asked Questions 2
Shrinkage and deformation of the coil
1. Cause analysis:
(1) Improper coil storage, the body water, resulting in water evaporation in the heating process, the body shrinkage;
(2) When the hot-melt coil with SLATE is constructed, the short side lap is not treated with rock compression, resulting in small lap stripping strength;
(3) the coil is not rolled in advance during construction, and the stress of the coil is too large;
(4) In the construction process, brutal construction, force to "kick" and "pull" the coil, so that the coil force is too large to elongate the coil.
2. Solution:
(1) Coil construction can be rolled in advance to release stress;
(2) It is forbidden to carry out damaged construction on the completed waterproof layer;
(3) Check whether the coil is wet before construction. If it is wet, dry it after rolling.
Frequently Asked Questions 3
Wet roll does not bond well
1. Cause analysis:
(1) the cement mortar is too thin to adhere to the base; The base is not coated with cement mortar;
(2) too dry cement mortar;
(3) The hydration reaction of cement at low temperature is not complete;
(4) There are sundries and floating ash on the lap edge, and the bonding force is not enough;
(5) the base overdry absorption of water in cement, cement hydration reaction is not complete;
(6) Walking on the surface of the coil too early.
2. Solution:
(1) sufficient wetting of the base;
(2) The base should be smooth, clean, no uneven;
(3) the construction should be on the surface of the coil and the base at the same time coated with cement mortar (3mm-5mm);
(4) Coil construction temperature should be between 5-35 degrees Celsius.
Frequently Asked Questions 4
Polyurethane waterproof coating foaming
1. Cause analysis:
(1) The weather is too wet or rainy. Moist base surface;
(2) when using the low boiling point diluent added, diluent rapid volatilization prone to bubbles or small holes;
(3) hot weather, high base temperature;
(4) porous porous base;
(5) Single component products: the first coating is too thick;
(6) Two-component products: avoid the introduction of a large number of bubbles due to high speed stirring; If the ratio is wrong, there will be bubbles.
2. Solution:
(1) pay attention to coating protection on rainy days;
(2) Carefully add diluent, or contact relevant technical personnel to adjust diluent type;
(3) multiple brushing, pay attention to a coating thickness, and sub-vertical brushing;
(4) Construction in the ambient temperature between 5-35 degrees Celsius.
Frequently Asked Questions 5
JS polymer cement waterproof coating cracking
1. Cause analysis:
(1) the base is too dry or improperly handled; The construction environment temperature is too high, which leads to the material surface cracking; Powder using conventional cement, affect the material film;
(2) The ratio of liquid material and powder material is incorrect; Too much water added to liquid material; No curing film formation;
2. Solution:
(1) Qualified powder for construction application;
(2) Strictly abide by the correct ratio of liquid and powder;
(3) Construction at ambient temperature between 5-35 degrees Celsius.
Frequently Asked Questions 6
Non - curing rubber asphalt waterproof coating is not firmly bonded to the base
1. Cause analysis:
(1) wet base;
(2) loose base, sand;
(3) The base is not cleaned, dust, debris.
2. Solution:
(1) construction should be carried out under the condition of dry base;
(2) grinding and shot blasting at the base;
(3) Clean the base, remove floating ash and sundries on the surface of the base.