【Daily Question】【Civil Engineering Version 20180602】

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Which of the following statements regarding the construction of waterproof mortar waterproof layers is correct? ( ) A. Mortar-based waterproofing involves the use of cement slurry and cement mortar (referred to as waterproof mortar) in a specific mixture, which is applied in layers over time; these layers are pressed together to create a solid, sealed waterproof structure. B. The waterproof layer on the back side of the substrate uses a five-layer structure, while the waterproof layer on the front side of the substrate uses a four-layer structure. C. Each layer of the waterproof layer should be applied continuously; it is not necessary for the plain lime layer and the mortar layer to be completed on the same day. D. Kneading the mixture ensures that the cement mortar and plain lime mix thoroughly and bond firmly, thereby protecting the plain lime layer while also providing waterproofing. If it is difficult to knead the mixture, water can be added to dilute it. Answer: A 【Explanation】Mortar-based waterproofing relies on the use of cement slurry and cement mortar (known as waterproof mortar) in a specific mixture, which is applied in layers and pressed together to seal all capillary pores, thus creating a multi-layered waterproof structure. For the waterproof layer of the waterproof mortar, a four-layer system is used for the waterproofing of the backside substrate (\"two binders and two mortars\”), while a four-layer system is also employed for the waterproofing of the frontside substrate (\"three binders and two mortars\”). Each layer of the waterproofing layer should be constructed continuously, and the plain lime layer and the mortar layer should be completed on the same day. Kneading the mixture ensures that the cement mortar and the plain mortar penetrate each other and bond firmly, thereby protecting the plain mortar layer while also providing waterproofing. It is strictly prohibited to add water during this kneading process, as this can cause cracks, flaking, or sanding in the waterproof layer.