Report on Load Resistant Capacity when Promoting Curing PC Beam Specimens Affected by Alkali Silica Reaction

Abstract:

In this paper, ｍade a PC beam specimen using ASR reactivity aggregate made in Chinese Zhejiang Ministry and made them do an accelerated curing and the influence by which swell of ASR reactivity aggregate gives it to a PC beam specimen was evaluate. Moreover the PC beam specimen which degraded by swell was classified every degradation grade, a loading test was put into effect and the load carrying capacity was inspected. As a result, I got the following conclusion. ①The thing which classifies the degradation grade into 3 stages (incubation period, acceleration period and degradation period) from the accelerated curing results of the test piece performed in advance. In the incubation period, it was confirmed that the compressive strength and the modulus of static elastic tend to increase more than before accelerated curing. ②Expansion of PC beam specimen was inflated from the upper edge part with less influence of prestress, Moreover as the expansion stabilized, the tendency of the lower edge portion which is highly affected by the prestress to expansion could be confirmed from the strain behavior by monitoring.In addition, with expansion of the lower edge part the prestress amount of the PC steel material placed inside the PC beam specimen (The lower edge position) is increasing and as the prestress amount stabilizes the tendency of expansion of the lower edge part is stabilized can also be confirmed. ③When accelerated curing was further promoted, the expansion of the upper edge and lower edge turned to a decreasing trend, and it was confirmed that stabilize tendency at about 25 to 35% of the maximum expansion. ④The P-δ curve up to fracture was measured for PC beam specimen before accelerated curing and ② to ③. As a result, it was not possible to confirm a large difference at the P-δ curve before accelerated curing and ②, but a significant decrease in load bearing capacity was confirmed at ④.

• Periodical: Solid State Phenomena (Volume 272)
• Pages: 127-134
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.272.127
• Online since: February 2018
• Authors: Munenobu Murasaka*, Motoyuki Suzuki
• Keywords: Accelerated Curing, Alkali-Silica Reaction, Destructive Testing (P-δ Curve), Monitoring Measurement, PC Beam Specimen, Remains Prestress

References

[1] Shigeru Matsumoto et al: Long-term chase inspection result report of surface protector for alkali aggregate reaction, Repair of concrete structure reinforcement upgrade Symposium paper, Vol. 2, pp.29-34, (2002).

[2] Midori Onosato et al: Physical property confirmation test of reinforced concrete member where alkali aggregate reaction occurred and member test, Concrete engineering annual paper, Vol. 29, No. 1, pp.1311-1316, (2007).