Materials for Buildings and Structures, Volume 6
Construction fabrics are experiencing degradation phenomena as a result long term motion of the atmospheric parts. the certainty of the delivery features in concrete is a key factor to mitigate the deleterious consequences.
traditional cement-based fabrics be afflicted by a scarcity of ductility. besides the fact that, smooth cement compositions, fiber fabrics and additions enable to engineer new items adjusted to the purpose.
those and a number of other key subject matters for contemporary civil engineering are mentioned during this publication.
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Extra info for Materials for Buildings and Structures, Volume 6
The number of potential combinations, for this case would be costly. The Taguchi method reduces the number of tests to be performed, by the use of preset orthogonal arrays, without the loss of relevant information. Interactions among factors can be identified through the application of this method. Table 1 illustrates factors and levels selected. Table 2 shows the experimental plan devised. Table 1 – Factors and levels (% in weight) FACTORS Type of Additives Resin resin content Level 1 Polyester No 17% Level 2 Epoxy 25% 20% Type of sand Clean sand Foundry sand Postcure No Yes The selected array was L16 [7-11].
All the specimens were demolded after 24 hours and submerged in lime-saturated water, until the age of 28 days. The age of 24 hours, just after demolding, was taken as the reference point for the shrinkage measurements. h. The evolutions of the average deformations during the period of curing are shown in Figure 3. As expected, all three concretes experience some swelling under water. More importantly, the swelling appears to be slightly lower in the concretes with SRA. 06 0 7 14 Time (age in days) 21 Figure 3.
6000 5000 4000 3000 2000 6000 5000 4000 3000 2000 1000 1000 25% No % of Charge Figure 4 –Effects of the % of charge and type of sand on flexural toughness Clean Foundry Type of Sand 46 Interaction Plot Effect: % of Charge * Type of Sand Dependent: Max. Load [N] With 95% Confidence error bars. Means of Max. mm] With 95% Confidence error bars. 7000 6000 5000 25% 4000 No 3000 2000 1000 Clean Foundry Type of Sand Clean Foundry Type of Sand Figure 5 – Interaction of the type of sand/% of resin on maximum load and flexural toughness • • • • • • 4 The analysis of the results show that: epoxy concrete has higher strength and flexural toughness strength and than polyester concrete the % of charge (calcium carbonate) is the variable that affects the most the mechanical properties.