By Mohamed, A.M.O.
Read Online or Download Reclaiming the Desert: Towards a Sustainable Environment in Arid Lands: Proceedings of the Third Joint UAE-Japan Symposium on Sustainable GCC Environment and Water Resources (EWR2006), 30 January - 1 February 2006, Abu Dhabi, UAE. PDF
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Additional resources for Reclaiming the Desert: Towards a Sustainable Environment in Arid Lands: Proceedings of the Third Joint UAE-Japan Symposium on Sustainable GCC Environment and Water Resources (EWR2006), 30 January - 1 February 2006, Abu Dhabi, UAE.
Example text
This fast-curing property contributes to shortening construction period. (2) Salt tolerance In accordance with JSTM C 7401 “Concrete chemical resistance test by immersion in liquid solution,” a test sample (5 cm ϫ 10 cmH) was immersed in a transparent container filled with artificial seawater for 12 months. Fig. 5 shows the result. Like that of ordinary concrete, the compressive strength of modified-sulfur concrete showed no decrease from the start of immersion to an immersion period of 12 months.
To further evaluate whether the sulfur was lost due to gas formation or combination with other existing heavy metals to form metal sulfide forms, loss of sulfur weight as a function of temperature was studied as shown in Figure 9. 25% at 80°C and 1% at 100°C after seven days indicating that the possible increase in voids at 80 and 100°C could be attributed to sulfur gas formation. Furthermore, to evaluate the size of the voids from the results of SEM, we have utilized image analysis software. The results are shown in Figure 10 in terms of the cumulative percentage of voids for SPC at different temperatures.
The strength of sulfur concrete is often greater than that of PCC and the stiffness can be modified by suitable admixtures. It also shows excellent resistance to attack by acidic and saline solutions. While SPC could be prepared by hotmixing unmodified sulfur and aggregate, durability of the resulting product was a problem. Solid sulfur can exist in two crystal forms with different densities. Failure to stabilize the sulfur will result in a transformation to a crystalline sulfur structure with poor strength characteristics and can result in a volume change of the material.