Strength of limestone-based non-calcined cement and its properties

Abstract

A new type of cement was prepared with ground limestone powder, blastfurnace slag, steel slag and gypsum without calcination. The fraction of ground limestone powder in the cement was as high as 40 wt%–60 wt% without Portland clinker. All of its physical properties can meet the requirements of masonry cement standards. The impact of limestone content on physical properties of the cement and determined its impact on law was investigated. The steel slag can excit the aquation activity of this cement effectively, and the influence of its quantity on the strength of the materials was studied, which shows that the optimum quantity of mixing is 10%. By way of changing the different content of the lime stone by quartzy sample, the law of the compression strength and the PH value was determined, confirming that the lime stone can promote the early aquation of the slag and improve the early strength. The main hydration product of this cement is calcium aluminate hydrate, ettringite and calcium silicate hydrate, as indicated by XRD and SEM analysis.

Keywords

ground limestone powder / non-calcined / clinker-free cement / steel slag

References

[1] Detwiler R. J., Tennis P. D. The Use of Limestone in Portland Cement: a State of the Art Teview[M], 1996 Skokie, IL Portland Cement Association

[2] G Kakali, S Tsivilis, E Aggeli, et al. Hydration Products of C₃A, C₃S and Portland Cement in the Presence of CaCO₃[J]. Cement and Concrete Res. 2000, (30): 1 073–1 077

[3] Menéndez L., Bonavetti V., Irassaru Ping E. F., . Strength Development of Ternary Blended Cement with Limestone Filler and Blast-furnace Slag[J]. Cement & Concrete Composites, 2003, 25: 61-67.

[4] Voglisa N., Kakalia G., Echaniotakis, . Portland-limestone Cements their Properties and Hydration Compared to those of other Composite Cements[J]. Cement & Concrete Composites, 2005, 27: 191-196.

[5] Li B., Chen F. Study on the Mechanical Property of Portland Limestone Cement[J]. Journal of Building Materials, 1998, 1(2): 186

[6] Wang X., Wang X. Influence of Limestone Addition, C₃S Content of Clinker and Cement Fineness on Cement Performance[J]. Cement Engineering, 2003, 1: 26-30.

[7] Hu S., Li R. Impact of Charge of Limestone as Additive up on Properties of Cement[J]. Cement Engineering, 1996, 2: 22-24.

[8] Sprung S., Slebel E. Assessment of the Suitability of Limestone for Portland Cement (PKZ)[J]. Zem.- Kalk-Gips, 1999, 44: 1-11.

[9] Vuk T., Tinta V., Gabrovsek R., . The Effects of Limestone Addition, Clinker Type and Fineness on Properties of Portland Cement[J]. Cement and Concrete Research, 2001, 31: 135-139.

[10] Mun K. J., Hyoung W., Wlee C. Basic Properties of Non-sintering Cement Using Phosphogypum and Waste Lime as Activator[J]. Construction and Building Materials, 2007, 21: 1 342-1 350.