STABILIZING SELF-LEVELLING CONCRETE WITH POLYSACCHARIDE ADDITIVES
One of the high-performance concretes made possible by superplasticizers is self-levelling concrete(SLC).A distinct property of SLC is its very low(plastic)viscosity.This allows for a very fast and large flow so that the concrete becomes self-levelling.The low viscosity introduces the problem of instability of the concrete leading to segregation and bleeding.Stabilization of the concrete is necessary but should not impede the flow properties by increasing the viscosity.A new starch-based stabilizing agent has been developed which provides such a rheology to the concrete that bleeding and segregation is effectively prevented without affecting significantly the ability to flow.The mechanism of action of the stabilizer allows for its use in combination with any type of superplasticizer with a preference for the melamine and polycarboxylate-ether types.The stabilizer allows for a more robust concrete as it prevents failing due to small deviations in the mix design.Therefore,both the workability and the ease of production of SLC are increased by the stabilizing agent.
Jacob Terpstra
AVEBE Industrial Specialties The Netherlands
国际会议
长沙
英文
207-213
2005-05-26（万方平台首次上网日期，不代表论文的发表时间）