Flexural strengths and fibre efficiency of steel-fibre-reinforced, roller-compacted, polymer modified concrete

Abstract

A new material suitable for the structural repair of concrete pavements has been developed at Coventry University exhibiting high flexural, shear and bond strengths and high resistance to reflection cracking, demonstrating also unique 'placeability' and 'compactability' properties. This article deals with the standard equivalent flexural strengths evaluated using the identical fibre bridging concept and the size effect. Correlation of flexural strengths for beams of different sizes was achieved and the efficiency of fibre in the mix was scrutinised. It was concluded that the efficiency was much higher in the new steel-fibre reinforced, roller compacted, polymer modified concrete (SFR-RC-PMC) mix than in conventional concrete. The high efficiency revealed by the fibre bridging law is mainly attributed to a lower water to cement ratio. It was also found that the fibre aspect ratio influences significantly the flexural performance of the new material. The very high flexural strength extracted from the SFR-RC-PMC, compared to conventional steel-fibre reinforced concrete is very favourable to worn concrete pavement rehabilitation. Figure 3? Dear EditorThe reason for the sharp drop of flexural strength of mix PAVPMC1.5%-35 shown in Fig.3 is due to the fact that it exhibited lower flexural toughness than the other mixes. The mix contained 1.5% 35mm-length steel fibre by volume. The flexural performance of the same mix under 3PB shown in Fig.4 also exhibited the same tendency.The article has been amended accordingly (p:5, below Figure 3) 2In Table 8, how can we use the fibre bridging law in site applications?The fibre bridging law can serve as an index to evaluate the fibre efficiency for the selection of ingredients during the mix design process in practical (site) applications.For example, mixes SBRPMC1.5%-35 and SBRPMC1.5%-50, in Table 8, are the same (have identical proportions of ingredients), only the former incorporates shorter fibres than the latter. It is apparent from Figure 6 (b) that SBRPMC1.5%-50 is more efficient than SBRPMC1.5%-35 because the fibres of mix -50 provide higher tensile strength than those of -35, for the same crack opening displacement. In this case, the fibre bridging law specified in Table 8, can be used to predict the flexural performance of beams made of the three different mixes.This has been mentioned in the article (p:15, just above the Concluding Remarks) HIGHLIGHTS: Standard equivalent flexural strengths are established for overlay pavement design  SBRPMC1.5%-35 mix is optimal for flexural and bond strengths and workability  Lower w/c is the main reason for superior performance of fibre in the SFR-RC-PMC  The fibre bridging law can be an index of fibre efficiency in a mix design  The fibre bridging law can be used to predict the flexural performance of beams

Effects of Reinforcing Fiber and Microsilica on the Mechanical and Chloride Ion Penetration Properties of Latex‐Modified Fiber‐Reinforced Rapid‐Set Cement Concrete for Pavement Repair

“…Compared with a general concrete pavement, RCCP has a lower water-to-cement (W/C) ratio [2]. A lower W/C ratio has the effect of increasing the strength of concrete, and it may reduce the risk of contraction cracks due to moisture evaporation [2][3][4][5][6]. us, RCCP also has the advantage of increased durability of pavement over the long term [2][3][4][5][6].…”

“…RCC does not require a consistency for compacting, and it must be compacted with an external vibrator, such as a vibration roller or a vibration pressure tamper [2]. Roller-compacted concrete pavement (RCCP) offers a fast, successive construction and use of a wide range of construction equipment; thus, it has higher economic feasibility than other concrete pavements [2][3][4][5][6]. Compared with a general concrete pavement, RCCP has a lower water-to-cement (W/C) ratio [2].…”

“…A roller-compacted concrete (RCC) is a concrete with low fluidity [2][3][4][5][6]. RCC does not require a consistency for compacting, and it must be compacted with an external vibrator, such as a vibration roller or a vibration pressure tamper [2].…”

Silindirle sıkıştırılmış betonun dayanıklılık performansı ve boyutsal kararlılığı: Kapsamlı inceleme

“…içeremeyen karışımlara göre %20 oranında daha az olduğunu tespit etmişlerdir. Bu sonucun, polipropilen lif kullanıldığında SSB karışımının su/çimento oranındaki artıştan meydana geldiğini bildirmişlerdir.Karadelis ve Lin[38], tarafından yapılan çalışmada çelik lif ve polivinil alkol (PVA) lif kullanımının SSB'lerin eğilme dayanımları üzerindeki etkileri araştırılmıştır. Bu bağlamda çelik lif kullanım oranı hacimce %1, 1,5 ve 2 olarak, PVA oranı ise %1,5 olarak belirlenmiştir.…”

A comparison of flexural strengths of polymer (SBR and PVA) modified, roller compacted concrete

“… This brief article aims to reveal the flexural performance, including the equivalent flexural strength of PVA (Polyvinyl Alcohol) modified concrete by comparing it primarily with that of SBR (Styrene Butadiene Rubber) concrete. This data article is directly related to Karadelis and Lin [6] . …”