READABILITY TEST OF RFID TEMPERATURE SENSOR EMBEDDED IN FRESH CONCRETE
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Concrete maturity technology is used to predict the strength of concrete being cured and make an informed decision for stripping the formworks. However, the current concrete maturity method uses temperature sensors that require an extensive wiring, which is not often acceptable on construction site due to harsh working environment. Radio Frequency Identification (RFID) technology provides a solution for the wiring issue because of its ability of sending data wirelessly. An RFID tag integrated with a temperature sensor and placed within fresh concrete may be able to read temperatures of concrete and transmit them to an RFID reader wirelessly in realtime. It may then enable construction professionals to use concrete maturity technology to make an informed decision for stripping the formworks without having to worry about wiring issues on construction site. However, the previous research indicated that the RFID signal gets dispersed in liquid medium. One may speculate then how well RFID signals can travel through fresh concrete with high water content. Would water content of fresh concrete affect the readability of RFID tags? Would the tag's burying depth within fresh concrete affect its readability? This paper presents the results of our investigation on the readability of RFID tags placed in fresh concrete in the early stage of the curing process. Santrauka Betono stiprejimo technologija taikoma apdorojamo betono stiprumui prognozuoti priimant sprendima, kada galima nuimti klojinius. Vadovaujantis betono stiprejimo kontroles metodu, naudojami temperatros jutikliai, prijungiami laidais, kuriuos ne visada patogu naudoti sunkiomis statybos aikteles salygomis. Laidu galima atsisakyti taikant radijo danio nustatymo (RDN) technologija, nes ji leidia siusti duomenis be laidu. RND siustuvas, pritvirtintas prie temperatros jutiklio ir idetas i vieia betona, gali matuoti betono temperatra ir perduoti jos reikmes i RND imtuva be jokiu laidu. Remiantis tokia informacija galima spresti, kada nuimti klojinius nesukeliant rpesiu su jutikliu laidais. Taiau ankstesni tyrimai parode, kad skystoje aplinkoje RDN signalas isklaidomas. Galima tik speti, kaip is signalas sklis vieio betono aplinkoje. Ar tokiame betone esantis vanduo leis skaityti RND siustuvu informacija? Ar siustuvo gylis vieiame betone komplikuos jo informacijos skaitymo galimybe? iame straipsnyje apraomi RND siustuvu informacijos tyrimo rezultatai, gauti idejus siustuvus ankstyvuoju vieio betono stiprejimo laikotarpiu.
