A comparison of early hydration properties of cement–steel slag binder and cement–limestone powder binder

The role of various powders including glass powder (GP), limestone powder (LP), and steel slag powder (SSP) during the hydration process of cement-based materials was investigated by using X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and strength tests. GP has adverse impact on early strength, but the pozzolanic reaction at later stage enhances the strength development greatly. LP can significantly improve early strength. SSP has a good contribution to the early and later strength of the paste when its content is less than 15%. GP has little effect on the kind of hydration products but relatively large effects on the quantity. Calcium hydroxide (CH) content of GP paste decreases over curing age gradually, which is different from pure cement paste because its pozzolanic activity consumes more CH than that generated from the cement hydration. SSP and LP mainly play a role of filling effect at early stage. Nucleating effect of LP also promotes the early hydration of cement. The hydration of LP occurs at later stage and forms the calcium carboaluminate hydrates. The hydration of SSP is relatively slow, which generates CH at later stage and is effective in the strength development.

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Influence of Limestone Powder on the Hydration of Cement-Steel Slag Composite Binder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.988.226 ◽

2014 ◽

Vol 988 ◽

pp. 226-229

Author(s):

Mu Tian Liu ◽

Jin Hu ◽

Ying Jun Mei

Keyword(s):

Compressive Strength ◽

Steel Slag ◽

Hydration Heat ◽

Limestone Powder ◽

Mineral Admixtures ◽

Hydration Products ◽

Early Hydration ◽

Composite Binder ◽

Negative Effect ◽

Positive Effect

Steel slag and limestone powder are both mineral admixtures for cement or concrete. Steel slag can react with water and produce hydration products. The hydration activity of limestone powder is very limited. This paper investigated the influence of limestone powder on the hydration of cement-steel slag composite binder by determining the hydration heat and compressive strength. The results show that limestone powder can promote the early hydration of the composite binder and the compressive strength of mortar increases by replacing part of steel slag by limestone powder. However, at the age of 28 days, the positive effect of limestone powder is almost equal to its negative effect, so the compressive strength of mortar changes little by replacing part of steel slag by limestone powder.

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Early hydration properties of composite binder containing limestone powder with different finenesses

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-015-5088-9 ◽

2015 ◽

Vol 123 (2) ◽

pp. 1141-1151 ◽

Cited By ~ 15

Author(s):

Han Fanghui ◽

Wang Qiang ◽

Liu Mutian ◽

Mei Yingjun

Keyword(s):

Limestone Powder ◽

Hydration Properties ◽

Early Hydration ◽

Composite Binder

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Development of UHPC Mixtures Utilizing Natural and Industrial Waste Materials as Partial Replacements of Silica Fume and Sand

The Scientific World JOURNAL ◽

10.1155/2014/713531 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 6

Author(s):

Shamsad Ahmad ◽

Ibrahim Hakeem ◽

Mohammed Maslehuddin

Keyword(s):

Silica Fume ◽

Industrial Waste ◽

Steel Slag ◽

Limestone Powder ◽

Waste Materials ◽

Cement Kiln ◽

Test Results ◽

Strength Criteria ◽

Natural Pozzolana ◽

Kiln Dust

In the exploratory study presented in this paper, an attempt was made to develop different mixtures of ultrahigh performance concrete (UHPC) using various locally available natural and industrial waste materials as partial replacements of silica fume and sand. Materials such as natural pozzolana (NP), fly ash (FA), limestone powder (LSP), cement kiln dust (CKD), and pulverized steel slag (PSS), all of which are abundantly available in Saudi Arabia at little or no cost, were employed in the development of the UHPC mixtures. A base mixture of UHPC without replacement of silica fume or sand was selected and a total of 24 trial mixtures of UHPC were prepared using different percentages of NP, FA, LSP, CKD, and PSS, partially replacing the silica fume and sand. Flow and 28-d compressive strength of each UHPC mixture were determined to finally select those mixtures, which satisfied the minimum flow and strength criteria of UHPC. The test results showed that the utilization of NP, FA, LSP, CKD, and PSS in production of UHPC is possible with acceptable flow and strength. A total of 10 UHPC mixtures were identified with flow and strength equal to or more than the minimum required.

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