Construction process for lowering alkali reversion quality problem of building external wall
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A technology for building exterior walls and quality problems, applied in construction, building structure, covering/lining, etc., can solve problems such as pointing out key points and requirements, and achieve prolonging service life, reducing alkali return phenomenon, and good resistance to alkali return. Effect
Inactive Publication Date: 2019-09-10
GUANGDONG CONSTAR CONSTR GRP CO LTD
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However, this construction method does not point out the main points and requirements for the process of preparing materials such as cement and concrete.
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Embodiment 1
[0024] like Figure 1-2 As shown, a kind of construction technique that the present embodiment provides reduces the quality problem of alkali return of building exterior wall, concrete steps are:
[0025] (1) Construction preparations, preparation of construction materials, including low-alkali cement powder, sand, admixtures and alkali reversion inhibitors, while paying attention to weather conditions, avoiding construction in rainy, windy, low-temperature and other bad weather conditions;
[0026] (2) Cement 2 preparation, when preparing cement 2, strictly control the amount of water added in the mixing process of low-alkali cement powder and sand, add admixture and back-alkali inhibitor, low-alkali cement powder, sand, water, admixture and back-alkali The mass ratio of the inhibitor is 1:3:0.6:0.006:0.01;
[0027] (3) The cement 2 is painted. After the brushing is completed and before the cement 2 is dry, it cannot be in contact with water. When it is used as a ceramic til...
Embodiment 2
[0031] like Figure 1-2 As shown, the construction points of each step in a construction process to reduce the quality problem of building exterior wall alkali return are as follows:
[0032] The water used in steps (2) to (5) has a pH value of 7, which avoids the phenomenon of returning to alkali due to water quality.
[0033] The admixture added in step (2) is a naphthalene-based high-efficiency water reducer, specifically a naphthalenesulfonate formaldehyde condensate (produced by Anyang Shuanghuan Auxiliary Co., Ltd.), in order to prevent the prepared cement 2 from bleeding The alkali reversion inhibitor added is the Mei Ni brand QY9019 powder cement inhibitor produced by Beijing Wotu Building Materials Co., Ltd.
[0034] The concentration of oxalic acid painted in step (4) is lower than 5%, and the phenomenon of missing brushing is avoided. If the concentration of oxalic acid is higher than 5%, it will cause corrosion and other damage to ceramic tiles, external walls and...
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Abstract
The invention relates to the technical field of constructional engineering, and provides a construction process for lowering an alkali reversion quality problem of a building external wall. The construction process comprises the specific steps: (1) construction preparation is conducted, specifically, construction raw materials are prepared and comprise low-alkali cement powder, sand, an additive and an alkali reversion inhibitor, meanwhile the weather situation is concerned, and construction under the severe weather condition is avoided; (2) cement preparation is conducted, specifically, the additive quantity of water in the mixing process of the low-alkali cement powder and the sand is seriously controlled during cement preparation, and the additive and the alkali reversion inhibitor areadded; (3) cement brushing is conducted, specifically, before being dried, cement cannot make contact with the water, and when the cement is constructed by serving as a tile seam filling agent, the water on the surface is volatilized as soon as possible after sponge wiping; (4) oxalic acid brushing is conducted, specifically, oxalic acid is evenly brushed on the surface of the building external wall; and (5) polyurethane brushing is conducted, specifically, after the oxalic acid is air-dried, polyurethane is evenly brushed on the surface of the building external wall. The alkali reversion phenomenon of the external wall is effectively reduced, the phenomenon of large-area falling off of face bricks is eradicated, and the service life of a building is effectively prolonged.
Description
technical field [0001] The invention relates to the technical field of construction engineering, and provides a construction technique for reducing the quality problem of alkali return of building exterior walls. Background technique [0002] There are two main causes of the alkali return of the exterior wall: one is the chemical reaction between the calcium hydroxide in the exterior wall material and the carbon dioxide in the atmosphere to form calcium carbonate and deposit on the surface of the exterior wall material; the other is the oxidation of the hydration product The crystals left on the surface after the water in the calcium solution has evaporated. The phenomenon of alkali return seriously affects the appearance and quality of buildings, causing dissatisfaction among consumers. Therefore, this common problem of building quality has become a hot spot for consumer complaints, and at the same time it has brought economic losses and unnecessary losses to real estate de...
Claims
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