The bright sunshine shines on the crystal dewdrops, free birds fly in the blue sky, the air is fresh, the birds are singing and the flowers are fragrant. There are clear water, blue sky, red flowers and green grass everywhere. Our world is as clear and beautiful as our souls...
This is what we once had, but suddenly looking back, when we rejoice in the modern civilization that has taken several generations of hard work to build, we find that we have gradually lost our rationality in the expansion of desire. The homes they depended on for survival were destroyed in ruthless plunder, leaving the green gardens in the past now in devastation!
Can you still sit down? Can it still be allowed to develop? No, what truly tests us is not our words, but our actions. The twin swords of environmental protection and energy conservation have been unsheathed, and the battle to defend our homes has begun!
Environmental protection is a passive way for us to make up for the situation, while energy conservation and emission reduction are a proactive way to solve problems. Things that can promote both aspects should naturally be vigorously promoted. Ready-mixed mortar is such a green building material with many advantages.
In the depth of our memory, the streets of the city are construction sites under construction, filled with bags of cement and piles of sand, coupled with a sieve and a mixer, this is the preparation of mortar all materials. The workers first sifted sand on the noisy and chaotic construction site, then used shovels to break open the cement paper bags, poured out the gray cement powder, added it to the sand and gravel next to them, and then poured the sifted sand and cement into the mixer. Add water to mix and mix. Dust spreads around, the machine roars, and workers’ faces and bodies are covered with dust.
Let’s take a look at what on-site mixing of construction mortar brings us.
In terms of materials, ordinary mortar mixed on site uses bagged cement and sand. A large number of cement paper packaging bags consume a lot of energy. If bulk cement is not used but continues to be The use of bagged cement in 2006 alone will waste 21.15 billion yuan in packaging costs, 2.8226 million tons of packaging paper (equivalent to 15.5455 million cubic meters of wood), 3.39 billion kWh of electricity, 710 million tons of water resources, and a comprehensive energy consumption of 8.07 million yuan. tons of standard coal. At the same time, the use of bagged cement is also accompanied by the loss of cement when the packaging is damaged, and if it cannot be used in time, about 20% of the raw materials will be lost in the entire on-site mixing process. The dependence on sand and gravel resources will cause huge damage to the ecological environment.
From a process perspective, the main part of urban pollution is dust pollution, of which construction sites are one of the main sources of pollution. According to statistics, construction dust accounts for 22% of urban dust emissions. At present, on-site concrete mixing is completely prohibited in urban areas, so the dust at the construction site mainly comes from the on-site mixing of mortar and the stacking of mortar raw materials. Mixing mortar on site will produce a huge amount of dust, causing serious air pollution. This will bring serious harm to construction workers and ordinary citizens. If they are exposed to excessive cement dust for a long time, it will lead to a decrease in lung function and even silicosis. In addition to the pollution of urban air, the storage of various raw materials requires space. The messy scene of mixing at the construction site will also have a bad impact on the appearance of a city, and the roar of the machine during the mixing process will also affect the normal daily life of citizens. Work, study and life bring inconvenience.
In the use process, the impact of raw materials on the performance of mortar increases. Mortars for different uses have different requirements for aggregates and cementitious materials. Production at the construction site is limited by conditions and construction schedules, and it is impossible to meet them one by one. The types of mortar products mixed on site are single and cannot meet the increasingly diverse needs of construction projects. The impact of on-site mixing of mortar on project quality
In terms of product quality, the result of on-site preparation of mortar is very unstable quality. Most on-site mixing uses manual measurement, which causes large errors and can easily lead to hidden dangers in project quality. An example is the China Sports Museum located in the Asian Games Village in Beijing, China. It is a supporting project built in conjunction with the Asian Games. It was built in 1990. According to the requirements of general museums, the lifespan of the building is 50-100 years. But the China Sports Museum had to be demolished after only 15 years. The "National Sports Museum House Safety Inspection Report" stated: "The actual wall mortar used by the museum does not match that indicated in the design, and its average strength is far from reaching the strength requirements indicated in the design" and "the foundation has obvious uneven settlement." It is precisely because of the insufficient marking of masonry mortar and the sinking of the foundation that it cannot escape the fate of being "short-lived". Since the shrinkage of non-clay products changes with the continuous evolution of the moisture saturation of the surrounding air, the products expand when the air is humid and shrink when the air is dry. The surface water absorption rates of clay products and non-clay products are also different, and the surface roughness is also different. If you still use unmodified ordinary cement mortar, it will be difficult to avoid the "cracks and seepage" problems that occur in new wall materials. At the same time, hollowing and falling off of the plaster layer often occur, so on-siteIt is easy to fall off the ceramic tiles after mixing the mortar, and the external wall insulation will not achieve the desired energy-saving effect and service life.
It can be seen that the unstable quality of the mortar mixed at the construction site will not only shorten the life of the building, cause the project quality to be substandard, and significantly increase the secondary construction rate, but more importantly, it will also cause The impact on the development of building energy conservation, which is currently being vigorously promoted across the country, is very harmful.
In addition, the on-site removal of piles of packaging, on-site sand screening, and on-site mixing all require manpower and affect the progress of the project. Using on-site mixing of mortar is labor-intensive, takes long hours, and has low production efficiency, which not only delays the progress of the project, but also increases the labor cost of the project.
Since our country is currently in its heyday of construction, the area of housing built every year is as high as 1.6 billion to 2 billion square meters, exceeding the total annual built area of all developed countries. The use of building mortar is inevitable. However, we cannot continue to use mortar in this way. Reducing energy consumption and utilizing energy rationally and effectively is our only way out.
Eliminate noise pollution, reduce dust pollution, restore the appearance of the city, realize industrial waste recycling, improve work efficiency, and ensure project quality...this is what ready-mixed mortar can bring us. The time has come when on-site mixing of mortar has become obsolete. </p
微信扫一扫打赏
