Factors Affecting Flexural Strength of MDF Cements

Kobayashi, Toshikatsu; Ohama, Yoshihiko; Demura, K.; Ochiai, Kuniyuki

doi:10.4324/9780203477151_factors_affecting_flexural_strength_of_mdf

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“…Also, it was found that the difference in relative strength between 2.5 and 5 phr became greater as the TMPTMA content increased. The obtained result was somewhat different from the previous study by Kobayashi et al, which stated that compressive strength of acrylic PC was highest for 5 phr TMPTMA at −20°C. The reason for this difference is most likely because the former study incorporated only 5% PMMA in MMA monomer, while the current study allowed up to 20% PMMA.…”

Section: Resultscontrasting

confidence: 99%

“…These findings demonstrate that the compressive strength of acrylic PC decreases with the reduced curing temperature, as conventional cement concrete does. In addition, the obtained result was similar to that of the previous studies by Haddad et al and Kobayashi et al, which reported that the compressive strength of acrylic PC is substantially dependent on curing temperature.…”

Section: Resultssupporting

confidence: 91%

“…They have reported that, as the curing temperature dropped from 38°C to −1°C, the flexural, bond, and compressive strengths were reduced by 8.1, 59.4, and 26.7%, respectively. Kobayashi et al stated that acrylic PC using polymethyl methacrylate (PMMA) as a binder and TMPTMA as a crosslinking agent could achieve the 7‐day compressive strength of over 80 MPa solely by modifying the contents of initiator (BPO) and promoter (DMA) at curing temperature of as low as 0°C to −20°C.…”

Section: Introductionmentioning

confidence: 99%

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Effects of TMPTMA and silane on the compressive strength of low‐temperature cured acrylic polymer concrete

Yeon

Cha

Yeon

et al. 2014

J of Applied Polymer Sci

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This study addresses the effects of additives on the compressive strength of low‐temperature cured acrylic polymer concrete (PC). Three curing temperatures (0°C, −10°C, and −20°C) and five ages (6, 12, 24, 72, and 168 h) with two different types of additives [trimethylolpropane trimethacrylate (TMPTMA) and silane] were investigated. As a result, the compressive strength tended to decrease as the curing temperature decreased. The compressive strengths at 24 h were approximately 90% of those at 168 h at both curing temperatures of 0°C and −20°C, indicating that the rate of early age strength development was quite high even at a very low curing temperature range. The results of two‐way variance analysis revealed that silane had a greater impact on the compressive strength than TMPTMA. About 13%–23% strength improvements with a 168‐h compressive strength of over 80 MPa could be obtained at −20°C by adding silane. Furthermore, this study proposed optimum mixture proportions of acrylic PC that generate a working life of 50–70 minutes with a compressive strength of 80 MPa at subzero temperatures. The findings of this study are expected to be effectively used in field applications of acrylic PC, especially in the cold regions during winter season. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40939.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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