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| ID No : | 946 Edit | Title: | Performance of "Waterless Concrete" |
| Summary / Review : | "Waterless concrete consists of molten elementary sulfur and aggregate. The aggregates in a lunar environment will be lunar rocks and soil. Sulfur is present on the Moon in Troilite soil (FeS) and, by oxidation of the soil, iron and sulfur can be produced. Sulfur concrete specimens were cycled between liquid nitrogen (approx.]91 C) and room temperature (^21 C) to simulate exposure to a lunar environment. Cycled and control specimens were subsequently tested in compression at room temperatures (^21 C) and ^-101 C. Test results showed that due to temperature cycling, the compressive strength of cycled specimens was 20% of those non-cycled. This reduction in strength can be attributed to the large differences in thermal coefficients of expansion of the materials constituting the concrete which promoted cracking. Similar sulfur concrete mixtures were strengthened with short and long glass fibres. The lunar regolith simulant was melted in a 25 cc Pt- Rh crucible in a Sybron Thermoline high temperature MoSi2 furnace at melting temperatures of 1450 to 1600 C for times of 30 min to i hour. Glass fibres and small rods were pulled from the melt. The glass fibres were used to reinforce sulfur concrete plated to improve the flexural strength of the sulfur concrete. Beams strengthened with glass fibres showed to exhibit an increase in the flexural strength by as much as 45%." (Author's abstract) |
| Author(s) : |
Toutanji, H. A.; Grugel, R. N., [Marshall Space Flight Center] |
| Publication Date: | 2009 |
| Category(s) : |
Bases, industry and manufacturing / Resource processing and outputs / Concretes |
| Progress Type: | AT ( A=Analysis only, D=Design, T=Testing, C=Completed or Commercial product ) |
| Web URL : |
http://hdl.handle.net/2060/20090033079
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| PERMANENT code(s) : | L,U |
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(Explanation of the last 3 rows above) |
In the row above, there are up to 4 possibilities: U = URL you can click on to get a copy instantly from another source on the internet, or request it from that source D = Downloadable from PERMANENT (such as because no other URL known...) L = LAN copy, PERMANENT has a digital copy but not downloadable from our website P = Paper copy in the PERMANENT office Typically, only 0 to 3 methods are available. |
| NTRS : | 20090033079 |
| Other Ref # : | M09-0491 |
| Submitted by : | MEP |
| Comments: |
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