Cement spring

The tensile strength of Portland cements is limited by the presence of relatively large pores (0.1-1.0 mm). Modern research has produced cements that are substantially free of large pores (macro-defect-free or MDF cements) and have very promising mechanical properties for example, MDF cements can be formed into cement springs.70 d... 

Figure 11.13, (a) Comparison between strength and reliability of cast cement and plastic mixed cement, (b) Cement spring made by extruding plastic cement mix and winding It round a tube. 

Fig. 17.2 Coiled high-strength micro-defect-free (MDF) cement spring in relaxed and extended positions...

Figure 10-162. Typical heat transfer cement/mastic sealing between vessel and heat transfer plates/coils/Temp-Plates using spring-loaded assembly. (Used by permission Cat. TP-108-9, 1994. Paul Mueller Co.)...

K. M. Cowan and T. R. Smith. Application of drilling fluids to cement conversion with blast furnace slag in Canada. In Proceedings Volume, number 93-601. CADE/CAODC Spring Drilling Conf (Calgary, Canada, 4/14- /16) Proc, 1993. 

Hansen, W.C. (1956). The Role of Calcium Sulfate in the Manufacture of Portland Cement, NRMC A Publication No. 63, National Ready Mix Concrete Association, Silver Spring, MD, 9. 

The third stage of passage development was piracy of stream flow into new channels. As water cut deeper into the limestone, new flow routes were developed and the older channels were abandoned. Some of the sediments in the abandoned channels became cemented with calcite or covered with breakdown and organic material. In the caves with active streams, these older channels presently take flow only during spring flood events. 

Visco-elastic or memory fluids Fluids with elastic properties that allow them to spring back after the release of a shear force. Examples include egg-white and rubber cement. 

---