第1个回答 2010-06-12
Pumping concrete pump is driven along in the pipeline transportation and construction, therefore, request except meet design strength and durability, and also to meet the performance of concrete mixing process of pipelines and the requirements for good pumped. Pumping agent has water, retarder, strengthen, early, non-toxic, odourless, non-combustible. Therefore, more and more widely. With the industrial technology progress, people of concrete for pumping agent requirement is: (1) water. Because the pumping concrete freeflowing collapsbillity, should use water high jianshuiji, can reduce concrete water-cement ratio, improve the intensity, on condition that required strength of cement, reduce cost saving. Adding water pumping agent, the rate of l5 % ~ 30%,
In the same intensity collapsbillity and circumstance, save cement l2 % above. (2) collapsbillity and small losses. In the same proportions, with water-cement ratio condition and pumping agent can make concrete collapsbillity 80mm increases. (3) has certain retarding action. Can both retain collapsbillity losses small, can reduce the early hydration heat release.the peaks, delay, avoid to produce the temperature cracks. (4) no, less water, segregation by shedding. Ensure the pump can be carried out smoothly, pump. (5) reduce concrete internal friction. Water is not easy flow. And lactation.
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第2个回答 2010-06-06
Outline
Pumping concrete pump is driven along the pipeline transportation and placement, and therefore, required to meet the design requirements in addition to the strength, durability and other properties, but also to meet the pipeline on the concrete mixture during the request, that good pumpability. Pumping agent with less water, slow setting, enhanced early strength characteristics, and non-toxic, odorless, nonflammable. Therefore, more and more widely applied. With the concrete industry technology advances, people are pumping agent requirements are: (1) reduction of water rates to be big. For pumping concrete fluidity, slump, water should be used by the high rate of water-reducing agent, can reduce the concrete water-cement ratio, strength, strength to meet the required conditions, the conservation of cement and reduce costs. Incorporation of appropriate pumping agent, water reducing rate of up to l5% ~ 30%,
Slump and strength in the same circumstances, save more than l2% of cement consumption. (2) slump loss. In the same proportion, with the water-cement ratio conditions, the mixing amount of pumping agent can increase concrete slump more than 80mm. (3) have some retarding effect. Slump loss not only to maintain a small, early stage can reduce the heat of hydration of cement, delayed exothermic peak, to avoid temperature cracks. (4) is not segregation, less bleeding, better water retention. Pumping can ensure smooth, not blocking the pump. (5) reduce the internal friction of concrete. That is, no bleeding and easy flow.本回答被提问者采纳
第3个回答 2010-06-06
Pumping concrete pump is driven along in the pipeline transportation and construction, therefore, request except meet design strength and durability, and also to meet the performance of concrete mixing process of pipelines and the requirements for good pumped. Pumping agent has water, retarder, strengthen, early, non-toxic, odourless, non-combustible. Therefore, more and more widely. With the industrial technology progress, people of concrete for pumping agent requirement is: (1) water. Because the pumping concrete freeflowing collapsbillity, should use water high jianshuiji, can reduce concrete water-cement ratio, improve the intensity, on condition that required strength of cement, reduce cost saving. Adding water pumping agent, the rate of l5 % ~ 30%,
In the same intensity collapsbillity and circumstance, save cement l2 % above. (2) collapsbillity and small losses. In the same proportions, with water-cement ratio condition and pumping agent can make concrete collapsbillity 80mm increases. (3) has certain retarding action. Can both retain collapsbillity losses small, can reduce the early hydration heat release.the peaks, delay, avoid to produce the temperature cracks. (4) no, less water, segregation by shedding. Ensure the pump can be carried out smoothly, pump. (5) reduce concrete internal friction. Water is not easy flow. And lactation