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首页> 美国政府科技报告 >Rheologic Properties of Fresh Cement Mixes for Repository Sealing Applications: Effects of Superplasticizers, Mixing Procedures, and Time
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Rheologic Properties of Fresh Cement Mixes for Repository Sealing Applications: Effects of Superplasticizers, Mixing Procedures, and Time

机译：用于储存密封应用的新鲜水泥混合物的流变特性：超塑化剂的影响，混合程序和时间

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As part of the design of optimally durable, hardened cementitious plugging materials for repository borheole plugging, shaft and tunnel sealing, detailed studies of rheological properties have been made. The effects of mixing procedures upon measured rheological properties of fresh cement mixes with and without superplasticizing admixtures condensates of sulfonated naphthalene- and melamine-formaldehyde have been investigated. Coaxial cylindrical viscometer measurements were made, recording shear stress-shear rate relationships and defining yield stress and plastic viscosity. In the absence of admixture, yield stress and plastic viscosity decreased substantially with increasing intensity of mixing, which caused a breakdown of particulate aggregates. However, with admixture present, the rheological properties of already well-dispersed mixes did not change significantly with increasingly intense mixing. The changes of the viscometric functions with time were investigated, and were related to admixture type and concentration, cement type, and volume concentration of cement. The mechanisms of action of the superplasticizers and their use in generating reliable workable low water/cement ratio mixes are discussed. 36 figures, 3 tables. (ERA citation 07:062776)

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