Influence of rice husk ash on strength and permeability of ultra-high performance concrete

Gao, Xiaojian; Wang, Hui; Ye, Huan

doi:10.1016/j.conbuildmat.2017.05.155

Cited by 173 publications

(29 citation statements)

References 22 publications

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“…The binder composition, particularly the cement type and the incorporation of alternative SCMs in UHPC can also impact the water absorption capacity. For example, the addition of RHA (Huang et al 2017) or treated bagasse ash (Rajasekar et al 2018) was found to reduce the sorptivity of UHPC. Ternary blended mixtures of cement, silica fume and metakaolin might increase the water capillary absorption compared to conventional UHPFRC with cement + silica fume according to Tafraoui et al (2016).…”

Section: Introductionmentioning

confidence: 99%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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The primary goal of the present paper is to investigate the influence of cracking on water transport by capillary suction of UHPFRC. Prismatic specimens were firstly loaded under four-point bending up to specific crack open displacement (COD). Target COD, under loading, was varied between 200 and 400 μm, in steps of 50 μm. After unloading, a COD recovery was observed with residual COD ranging between 116-334 µm and 75-248 μm for UHPFRC-1.5% and UHPFRC-3.0% specimens, respectively. The crack pattern created was characterised (number of cracks and crack width) before capillarity testing. Sorptivity results of cracked UHPFRC-1.5% and UHPFRC-3% specimens remained in the range of 0.024 to 0.044 mg/(mm 2 .min 0.5), which are about 2 to 4 times higher than the sorptivity results of noncracked UHPFRC specimens. However, the maximum sorptivity observed on cracked UHPFRC is relatively low as compared to typical sorptivity results found in good quality conventional concrete or engineered cementitious composites (ECC).

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Section: Introductionmentioning

confidence: 99%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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“…The furnace filled with rice husk was first heated at a rate of 10 °C to 500 °C for 2 h, and then the calcined residue was ground in a vibrating mill for 15 min. The particle size distribution and chemical compound were the same as in Reference [27]. The particle passing percentage and chemical composition of cement and RHA are shown in Table 1 and Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…The method for testing the particle passing percentage of cementitious materials was obtained according to the testing method for the particle size of cement. Additionally, the chemical composition of cement and RHA were chosen in a previous study [27].…”

Section: Methodsmentioning

confidence: 99%

The Application of Electrical Parameters to Reflect the Hydration Process of Cement Paste with Rice Husk Ash

Wang

Cao

et al. 2019

Materials

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This paper aims to study the electrical parameters (electrical resistivity and alternating current (AC) impedance spectroscopy) of cement paste with rice husk ash (RHA). The water to cement (Mass ratio of water to cement (w/c)) ratios of the paste in this study varied from 0.4 to 0.5. The mass ratio of rice husk ash in each w/c ratio of specimens ranged from 0% to 15% by t mass of cement. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to determine the microstructures of specimens. Moreover, the slump flow and plastic viscosity of fresh paste were determined. The results indicated that with the increasing dosage of RHA, the fluidity decreased, while the plastic viscosity increased. Meanwhile, a high w/c ratio led to a low plastic viscosity and high slump flow. The electrical resistivity of RHA cement paste gradually ascended with the increasing curing period. The conduction of specimens intricately changed by mixing RHA, a reasonable equivalent circuit was selected to describe the conduction mechanism by AC impedance spectroscopy. Additionally, the results of XRD and SEM showed that RHA could effectively promote the hydration process as well as decrease the size and number of cracks in hardened cement paste.

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“…A chloride ion is a typical ion for measuring the permeability of cement-based materials [43][44][45]. The permeability varies according to the porosity [46][47], the composition [48], the C-S-H gel characteristic [49][50], the wettability [17], etc., of the cementitious materials. All these features will change when they have been applied with a surface treatment.…”

Section: Chloride Resistancementioning

confidence: 99%

SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, N a₂S iO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY

Guo¹

2018

Ceramics - Silikaty

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The surface treatment of existing concrete structures with silica-based organic and inorganic agents is often used to improve the durability of the structures, but their effects vary from each other, thus the recognition of their strengths and drawbacks could help to make good use of the techniques under various environments. In this work, tetraethyl orthosilicate (TEOS), an organic precursor for manufacturing silica sol, together with other two normally used silica-based agents, Na 2 SiO 3 and silane, was used for the surface treatment of concrete. Their effects on the durability were studied and compared by investigating the compressive strength, the water absorption rate, the carbonation, the chloride penetration and the sulfate attack of cement concrete samples. The results showed that TEOS decreased the transport properties of concrete significantly: reductions of 49.0 % of the water absorption rate, 28.5 % of the chloride ion penetration depth, and 20 % of the carbonisation degree to that of the control sample were found, while the corresponding values of 42 %/80 %, 39 %/71 %, and 23 %/10 % of Na 2 SiO 3 / silane-treated samples were shown. The compressive strength and visual observation showed that the samples treated by TEOS exhibited the best performance for long term exposure in the 5 wt. % sodium sulfate solution when compared with silane-treated and Na 2 SiO 3-treated samples. The variation of the in-situ Ca(OH) 2 consuming capability of the agents, as well as their effects on the hydration and hardening properties of the cement-based material could be ascribed to their differences in improving the durability.

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Influence of rice husk ash on strength and permeability of ultra-high performance concrete

Cited by 173 publications

References 22 publications

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

The Application of Electrical Parameters to Reflect the Hydration Process of Cement Paste with Rice Husk Ash

SURFACE TREATMENT OF CONCRETE WITH TETRAETHYL ORTHOSILICATE, N a₂S iO₃ AND SILANE: COMPARISON OF THEIR EFFECTS ON DURABILITY

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