Durability and microstructure of coral sand concrete incorporating supplementary cementitious materials

Cheng, Shi; Shui, Zhonghe; Sun, Tao; Yu, Rui; Zhang, Guozhi

doi:10.1016/j.conbuildmat.2018.03.082

Cited by 130 publications

(26 citation statements)

References 32 publications

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“…Recently, the utilization of industrial by-products as supplementary cementitious materials (SCMs) in cement and concrete has attracted considerable attention for the technological, economic, and environmental benefits [1–4]. Copper slag is a by-product generated from the process of copper manufacturing [5].…”

Section: Introductionmentioning

confidence: 99%

Hydration and strength development in blended cement with ultrafine granulated copper slag

et al. 2019

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This study aims at evaluating the effect of ultrafine granulated copper slag (UGCS) on hydration development of blended cement and mechanical properties of mortars. The UGCS with the median particle size of 4.78 μm and BET surface area of 1.31 m 2 /g was used as a cement replacement to prepare blended cements. Hydration heat emission of blended cement and mechanical performance of mortars were investigated by using isothermal calorimetry and strength tests, respectively. X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) were applied to the analysis of pozzolanic reaction and hydration products. The results illustrate that UGCS has influence on the hydration heat evolution of blended cement due to its filler effect and pozzolanic reaction. The cumulative hydration heat of blended cement is reduced by partial cement replacement with UGCS. The test mortar prepared by using blended cements with 30 wt. % UGCS shows a retardation of strength development with a low value at early ages (7 days) and a rapid growth at later ages (28 days). The 90-day compressive strength of test mortar is 45.0 MPa close to that of the control mortar (49.5 MPa). The obtained results from XRD and TGA analysis exhibit an increase in calcium hydroxide (CH) consumption and calcium silicate hydrates (C–S–H) formation in blended cement pastes with curing time. The cement replacement with UGCS induces changes in microstructure of blended cement paste and chemical composition of hydration products.

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Section: Introductionmentioning

confidence: 99%

Hydration and strength development in blended cement with ultrafine granulated copper slag

et al. 2019

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“…Results showed that the addition of saturated coral aggregates into UHPC can help decrease the autogenous shrinkage, regardless of the aggregate content. Cheng et al [11] revealed that river sand concrete exhibits lower impermeability than coral sand concrete at all tested ages. In addition, they found that adding metakaolin and blast furnace slag can help reduce the drying shrinkage of coral sand concrete.…”

Section: Introductionmentioning

confidence: 93%

“…Cheng et al [8] found that the 28-day mechanical strength of coral concrete is higher than that of ordinary concrete, owing to the incorporation of metakaolin and blast furnace slag. Furthermore, the workability, volume stability, and durability of coral concrete has also been studied [9][10][11][12][13]. Xu et al [9] found that the workability of concrete gradually decreased with an increase in the replacement rate of coral reef sand; when the replacement rate was 100%, the slump was reduced to about 80 mm.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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“…From Figure 4(b), it can be observed that the actual value of the sample weight change at 8% cement content was less than the theoretical value at 28 d but exceeded the theoretical value after 90 d. e SS scheme had the fastest increase rate in quality in seawater conservation and increased by 0.69% in the 90 days. e reasons for this rapid increase were presumed to be the formation of high hydration products of cement content, water absorption during hydration, and formation of Friedel's salt [32]. Furthermore, combining the two figures shows that the weight change of the specimens at 8% cement content was generally 0.1∼0.2% larger than that of 5% cement content: more hydration products are produced during curing with more cement content, causing an increase in quality.…”

Section: Weight Changementioning

confidence: 99%

Effect of Curing on Mechanical Properties of Cement‐Stabilized Coral Sand in Marine Environment

Chen

Geng

Xiong

et al. 2020

Advances in Materials Science and Engineering

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The use of coral sand prepared from cement-stabilized materials can significantly reduce the cost, construction period, and damage to the environment caused by stone mining. The choice of water in mixing and curing the cement-stabilized materials on islands should be considered. Cement-stabilized coral sand was tested in three different preparation and maintenance systems in the marine environment. The compressive strength, weight change, and chloride ion concentration change in cement-stabilized coral sand with different cement content were measured after 7 d, 28 d, 60 d, and 90 d, respectively. The microstructure of specimens was observed by XRD and SEM. Results show that the compressive strength of specimens in the seawater mixing and seawater curing system developed 0.9 MPa faster than that in the fresh water mixing and curing system at an early stage. But the compressive strength of specimens in seawater mixing and seawater curing shrank later, being 0.5 MPa lower than that in fresh water mixing and curing. The cement content was positively correlated with the free chloride ion reaction and mass growth rate. For road construction on islands, the mixing and curing of cement-stabilized coral sand with seawater should be given priority in the early stage.

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Durability and microstructure of coral sand concrete incorporating supplementary cementitious materials

Cited by 130 publications

References 32 publications

Hydration and strength development in blended cement with ultrafine granulated copper slag

Hydration and strength development in blended cement with ultrafine granulated copper slag

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Effect of Curing on Mechanical Properties of Cement‐Stabilized Coral Sand in Marine Environment

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