In order to adjust to the pumping, the collapse of concrete will be reasonably huge, both benefits and negative aspects, the collapse of the concrete high-rise building pumping problem, nonetheless, the collapse will certainly likewise have a lot of issues, bean sprouts incorporated with sensible experience and numerous collected data, and every person to review the following points:
Versatility of concrete admixture to seal
1. Whether the stability of cement ore directly influences the security of mineral parts, hence impacting the flexibility of admixture in concrete to seal.
2. Cement production procedure, such as vertical kiln and rotary kiln, exactly how to manage the emergency cooling down actions in the cooling system, the temperature level of gypsum grinding, and so on, causing the modification of mineral parts, crystal stage state and gypsum morphology in concrete, therefore influencing the versatility of admixture to seal.
3. Adsorption admixture capability in concrete: C3A gt; C4AF gt; C3S gt; C2S, cement hydration rate is closely related to the mineral components.
4. Cement stored for an amount of time, the temperature level decline, improve the concrete admixture heat adaptability, and f-CaO after absorbing water in the air right into Ca (OH) 2, soak up carbon dioxide in the air into CaCO3, to make sure that Mwo decrease, additionally makes the concrete and boost, brand-new concrete collapse slow, concrete setup time prolonged.
5. The water need of common Portland cement is somewhat higher than that of slag concrete, which has great water retention, however the collapse loss is quickly.
6. Concrete with high C 3 A web content has quick collapse, yet excellent water retention.
7. Hydrophilic admixture in cement has great water retention, while volcanic ash cement has inadequate water retention and is easy to bleed water.
8. The level of temperature level and humidity directly impact the versatility of admixture to cement.
The proportion of sand and rock in the mix ratio and the percentage of each group of materials additionally impact the versatility of concrete admixture to cement.
Causes and treatment techniques of water drainage and partition in pumping concrete
1. root cause of formation
1). When the cement excellence is huge; low C3A content in the concrete is easy to produce; cement typical consistency is very easy to drain; volcanic ash Rose city cement is easy to drain; cement combined with nonhydrophilic crossbreed product is simple to drain pipes.
2). Concrete dosage is tiny and easy to drain water.
3). Reduced grade cement than high grade cement concrete easy to hemorrhage (the very same quantity).
4). Prep work of the same quality of concrete, high quality cement than reduced grade cement concrete is simpler to shed water.
5). Concrete with low toughness quality is prone to bleeding (normally).
6). Small sand rate is easy to show up bleeding water, segregation.
7). System water intake is very easy to hemorrhage, partition.
8). Continuous-grain quality crushed rock is much less effective than that of single-grain quality gravel.
9). Concrete admixture water retention, enlarging, inadequate air absorption of concrete is easy to appear water.
10). Concrete with excess admixture is prone to bleeding.
2. regards to negotiation
1). The essential technique is to lower the system of water usage.
2). Raise the sand price, and select a practical sand rate.
3). Enhance the quantity of cement or usage grade II fly ash.
4). Constant rated gravel was utilized, and the needle sheet web content was managed.
5). Enhance the efficiency of the admixture, so that it has much better water retention, thickening performance, the admixture dosage is reasonable, not overmixing.
The reasons and treatment methods of the phenomenon of realizing the bottom piece in pumping concrete
1. cause of development
1). Serious bleeding price
2). Big amount of cement is used
3). Huge admixture content
4). Sand rate is little
5). The admixture has high water decrease price, high bleeding rate, water retention, thickening and gas diversion result is poor
2. regards to negotiation
1). Reduce water intake per unit
2). Raise the sand price properly
3). Include an appropriate amount of admixture, such as fly ash, instead of some cement
4). Reduce the quantity of admixture appropriately
5). Boost the performance of air diversion, enlarging and water retention of concrete admixture
Reasons and treatment methods of pumping concrete collapse troubles
1. reason
1). admixture and cement versatility is bad
2). Adxture dose is not enough, slow coagulation, collapse result is bad
3). Weather condition temperature is high, and the admixture loses its activity at high temperature
4). The collapse degree of the machine is as well little, the device water intake is too small, resulting in the solubility of gypsum during concrete hydration, and plaster is the structure that slows down the concrete hydration warmth, cement hydration warmth in concrete is high, concrete collapse loss is quick
5). The sychronisation between the website and the mixing terminal is bad, and the pressure and traffic time is as well long, leading to tiny concrete collapse throughout putting
2. terms of settlement
1). Change the concrete admixture formula to make it adjust to the cement. Prior to building, make sure to do concrete admixture and concrete adaptability examination.
2). Readjust the concrete mix proportion, enhance the sand price and water usage, and readjust the first collapse degree of concrete to more than 500 px.
3). Include some fly ash as opposed to some concrete.
4). When the temperature is high, the admixture quantity is increased appropriately.
5). Protect against water evaporation as well quick, bubble overflow as well quickly.
6). Improve the water retention and cooling gadget of concrete transportation automobiles.
Causes and therapy techniques of pumping concrete pipeline barring
1. cause
1). Concrete and workability is poor, partition, concrete slim scattered.
2). Concrete mixture collapse degree is tiny.
3). Concrete blend to realize the bottom, concrete.
4). Using single particle dimension rock, rock fragment dimension is too large, the pumping pipeline diameter is tiny.
5). Rock needle tablet computers surpass the standard.
6). The pump truck stress is not nearly enough, or the pipe seal is not stringent, causing slurry leak.
7). Less rubber product, reduced sand rate.
8). Too many corners.
9). The pipe cleansing is unclean, leading to swellings and blocking the delivery of concrete.
10). When blending concrete is not uniform, the cement block is not loose right into cement slurry.
11). The pump pipe is not lubed with mortar before pumping.
2. terms of settlement
1). Check the sealing of the pipeline and the performance of the pump vehicle in good working condition.
2). Reasonable pipe format to lessen curves, especially 90 level curves.
3). Prior to pumping, the pipe must be lubricated with mortar.
4). Inspect whether the rock bit dimension meets the pumping needs, whether the size of the filter product of the sand bin is damaged, and whether the material is in good condition at the pump inlet.
5). Inspect the concrete into the pump and workability, whether the sand rate is appropriate, whether there is concrete pile, whether the mix is hemorrhaging, base, setting and other phenomena, if there is a corresponding change in time.
6). Check whether the initial collapse of concrete is 500 px. If the pipeline blocking is triggered by the rapid collapse, the issue of concrete collapse should be addressed initially (refer to the problem of collapse loss).
7). For skyscrapers, it is often a layer of framework after the pumping will certainly not get rid of the original connected pipe, however continue to attach the next pumping pouring, so a layer of framework putting to finish the pump pipeline cleaning completely, otherwise the formation of concrete in the wall of the pipeline, the following pumping will certainly bring the danger of obstructing the pump.
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