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凹凸棒石粘土经过挤压辊适当的挤压处理后 ,其内部显微结构被“膨松化”,并形成显微间隙与裂缝 ,从而使水分容易进入其中 ,造成显微结构的水化膨胀 ,以致在弱分散条件下就可在介质中解体分散 ,形成较高粘度 (如二次挤压凹土的粘度可达未挤压凹土的 5~ 10倍 )。凹土经挤压后 ,其水悬液的触变性和依时性也明显增强 ,而流变特性则随凹土挤压程度的加深有从不典型宾汉体向假塑性流体演变的趋势 ,且塑性粘度 (η1)上升 ,动切力 (τ0 )下降。
After the attapulgite clay is squeezed properly by the squeeze roll, its internal microstructure is “bulked” and forms micro-gaps and cracks, so that moisture easily enters into it, resulting in hydration expansion of the microstructure , So that under the condition of weak dispersion, it can be disintegrated and dispersed in the medium to form a higher viscosity (for example, the viscosity of the secondary pressed soils can be as high as 5 to 10 times that of the undecorated soils). When the concave soil is squeezed, the thixotropy and the timeliness of its aqueous suspension are also obviously enhanced, while the rheological properties tend to evolve from the atypical Bingham body to the pseudoplastic fluid with the deepening of the depression. The plastic viscosity (η1) increases, and the dynamic shear force (τ0) decreases.