With the continuous improvement of engineering quality, environmental protection requirements and civilized construction requirements, the shortcomings and limitations of mixing mortar on the construction site have become more and more prominent, and the dry-mixed mortar has gained more and more advantages due to its technical performance and social benefits. People's favor.
2.1 The disadvantages and limitations of traditional mortar
2.1.1 It is difficult to meet civilized construction and environmental protection requirements
The first is the storage site for various raw materials (including cement, sand, lime paste, etc.), which will affect the surrounding environment. Secondly, more dust will be formed during the mortar mixing process. As the relevant data show, the construction dust in Guangzhou city accounts for about 22% of the urban dust emission, while the cement use and related total dust emissions account for urban construction dust. The total amount is about 35%. Therefore, the dust emission during the use of cement is the main source of pollution for construction dust. In addition, the mixing equipment of the on-site mixing mortar often exceeds the noise, and the noise disturbance is also a major environmental problem in the city. With the advancement of society and the improvement of people's quality of life, environmental issues have become the focus of attention from all walks of life. The above-mentioned environmental problems appearing at the construction site not only hinder the image of the city, but also affect people's daily work and life. Progress is extremely uncoordinated.
2.1.2 It is difficult to guarantee the construction quality
Dry mortar operation firstly causes abnormal fluctuation of mortar quality due to inaccurate measurement. On-site mixing mortar is often not strictly measured. It is estimated by the workers on site that the mixing ratio cannot be strictly implemented; it is impossible to accurately add trace amounts of admixture; The amount of water added; the uniformity of the mixing is difficult to control, and the quality of the raw materials fluctuates greatly. For example, the mud content and gradation of the river sand in different sources are quite different. Under this condition, the abnormal fluctuation of the quality of the mortar is repeated. It is inevitable. Secondly, the construction performance of the on-site mixing mortar is poor. Because the existing mortar can not or rarely add admixture, the workability is poor, it is difficult to carry out mechanical construction, the operation is time-consuming and labor-intensive, the ash is much wasteful, and the quality accidents are many, such as the plastering mortar cracking and peeling off. Waterproof mortar leakage. In addition, the existing mixed mortar has a single variety, which cannot meet the different requirements of various new building materials for mortar. For example, the new wall material concrete hollow block, aerated concrete block, lime sand brick, ceramsite concrete hollow block encouraged by the state. , fly ash bricks, etc., and now mixed mortar has long been a limited mix of cement mortar, cement lime mortar, etc., far from adapting to the requirements of new wall materials.
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