Mechanically Induced Cracking Behaviour in Fine and Coarse Sand Strain Hardening Cement Based Composites (SHCC) at Different Load Levels

Two of the main activities of RILEM Technical Committee 208-HFC Subcommittee 2 were the preparation and publication of the state-of-the-art report on durability of strain hardening cement-based composites (SHCC), and the performance of comparative laboratory testing on SHCC. In this paper the comparative mechanical tests are reported, as performed in laboratories of five participating institutions. The purpose was to investigate and compare the crack patterns in terms of crack widths and spacing, and subsequently to make recommendations for a suitable test setup and procedure towards characterizing cracking in this class of materials. Such standardized procedures are required for future systematic and objective research towards durability of these materials in their in-service conditions, i.e. their resistance to deterioration processes in the cracked state. Standardized test procedures are also required for durability testing and guidelines for structural design with SHCC, which is the focus of follow-up committee activity in TC 240-FDS.

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“…[1,8,11]), in textile reinforced concrete (e.g. [6]) and ultra-high strength fibre reinforced composites [16].…”

Section: Introductionmentioning

confidence: 99%

Comparative testing of crack formation in strain-hardening cement-based composites (SHCC)

et al. 2015

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“…The results indicate that the ultimate load increases with increasing curing days; for example, when the curing duration is after 3 d, 14 d, and 28 d, the ultimate load of the SHCC-0%RBP is respectively 5.18 kN, 6.22 kN, and 7.70 kN, and the results are 4.9 kN, 6.28 kN, and 6.94 kN for the SHCC-54%RBP. It is noticed that the ultimate displacement generally decreases with increasing curing days, and this is due to the appearance of embrittlement with aging [51]. Compared with the results in Figure 11a-d, the adverse effects of embrittlement on the ultimate displacement of the SHCC-0%RBP is higher than that of the SHCC with RBP; for example, there are only three peaks in the force-displacement curve of SHCC-0%, whereas there are six peaks in the force-displacement curve of SHCC-54% after 28d curing.…”

Section: Flexural Strength Of Shcc When Using Rbp To Replace Cement Bmentioning

confidence: 99%

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Wang

et al. 2020

Materials

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Using eco-friendly recycled brick powder (RBP) derived from waste brick to prepare strain hardening cementitious composites (SHCC) provides a new way of recycling the construction and demolition waste (CDW), and the dosage of cement in SHCC can be decreased. This paper investigated the micro-properties and mechanical properties of SHCC containing RBP by a series of experiments. The results showed that RBP had typical characteristics of supplementary cementitious material (SCM). The addition of RBP increased the SiO2 content and decreased the hydration products in cementitious materials; in this case, the mechanical properties of mortar decreased with increasing RBP replacements, and a linear relationship was observed between them. It was noticed that the adverse effect of RBP on the mechanical properties decreased with increasing PVA fiber content in mortar. For SHCC containing various RBP replacements, the ultimate load increased, and the ultimate displacement decreased with increasing curing days. When using RBP to replace cement by weight, the ultimate displacement increased with the addition of RBP. Meanwhile, there was no significant reduction in the ultimate load of SHCC. When using RBP to replace fly ash (FA) by weight, the incorporation of RBP decreased the ultimate displacement of SHCC, whereas the ultimate load was improved. For example, the ultimate load and displacement of SHCC with 54%RBP were 17.6% higher and 16.4% lower, respectively, than those of SHCC with 54% FA.

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“…Once the specimens were unloaded, crack widths were significantly reduced. Details about the crack widths and spacing in the specimens can be found in Paul and van Zijl (2013b), and a summary given in Table 3 interms of average crack width (ACW), maximum crack width (MCW) and total crack width (TCW) for the respective specimens. …”

Section: Flexural Cracks In Shccmentioning

confidence: 99%

Crack Formation and Chloride Induced Corrosion in Reinforced Strain Hardening Cement-Based Composite (R/SHCC)

Paul

Zijl

2014

ACT

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This paper reports on corrosion of reinforcing steel bars in strain hardening cement-based composites (SHCC) under chloride attack. As part of a continued research project on durability of SHCC, the main focus here is on flexurally induced cracks in reinforced SHCC (R/SHCC) specimens with different cover depths. After unloading from the flexural test, these specimens are subjected to chloride attack, while monitoring steel corrosion. The R/SHCC specimens comprised series manufactured with two different types of sand, reinforced with single and double tensile steel bars with three different cover depths, in order to relate the crack patterns, cover depth and rebar corrosion. Crack widths of below 50 μm are found to allow chloride penetration to the rebar within hours. Corrosion potential and corrosion rate measurements, following a Coulostatic method, are reported. By removal of rebars from a number of specimens after more than a year of chloride exposure, corrosion damage is studied by visual observation, pitting depth measurements and tensile testing of the rebars. Chloride profiles are also determined through XRF in cracked and uncracked regions of the specimens. Relation of corrosion damage calculated from corrosion rate measurements, with observed corrosion damage is complicated by localised corrosion.

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Mechanically Induced Cracking Behaviour in Fine and Coarse Sand Strain Hardening Cement Based Composites (SHCC) at Different Load Levels

Cited by 33 publications

References 12 publications

Comparative testing of crack formation in strain-hardening cement-based composites (SHCC)

Comparative testing of crack formation in strain-hardening cement-based composites (SHCC)

Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Crack Formation and Chloride Induced Corrosion in Reinforced Strain Hardening Cement-Based Composite (R/SHCC)

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