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Abstract

This paper studied the influence of the dosage and fineness of limestone powder on the compressive strength of mortar. Based on the heat of hydration test and the boundary nucleation and growth model, the hydration kinetics parameters of the cement paste were calculated. The pore structure of the mortar was analyzed through a capillary water absorption test and mercury pressure test, revealing the mechanism of limestone powder on the compressive strength of mortar. The results show that with the increase in the dosage of limestone powder, the compressive strength of the mortar gradually decreases. When the dosage increases to 30%, the compressive strength of the mortar at the ages of 7, 28, and 56 days decreases by more than 20%. With the increase in the fineness of limestone powder, the compressive strength of mortar gradually increases. When the fineness of limestone powder increases from 1.084 μm2/μm3 to 2.168 μm2/μm3, the strengths of mortar at the ages of 7, 28, and 56 days increase by 6.1%, 4.2%, and 4.8%, respectively. Limestone powder reduces the hydration heat release rate, hydration heat, nucleation rate KN, and growth rate KG of hydration products of the cement slurry, thereby reducing the hydration degree of the slurry, increasing the capillary water absorption, void ratio, and maximum pore diameter of the mortar, and ultimately leading to the reduction of the compressive strength of the mortar.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.030

First Page

167

Last Page

173

Submission Date

May 2025

Reference

[1] HOSAN A, SHAIKH F U A. Compressive strength development and durability properties of high volume slag and slag-fly ash blended concretes containing nano-CaCO3[J]. Journal of Materials Research and Technology, 2021, 10: 1310-1322. [2] PHAM V T, MENG P, BUI P T, et al. Effects of Shirasu natural pozzolan and limestone powder on the strength and aggressive chemical resistance of concrete[J]. Construction and Building Materials, 2020, 239: 117679. [3] KLATHAE T, TRAN T N H, MEN S, et al. Strength, chloride resistance, and water permeability of high volume sugarcane bagasse ash high strength concrete incorporating limestone powder[J]. Construction and Building Materials, 2021, 311: 125326. [4] LI C Z, JIANG L H. Utilization of limestone powder as an activator for early-age strength improvement of slag concrete[J]. Construction and Building Materials, 2020, 253: 119257. [5] WANG D H, SHI C J, FARZADNIA N, et al. A review on effects of limestone powder on the properties of concrete[J]. Construction and Building Materials, 2018, 192: 153-166. [6] BOSILJKOV V B. SCC mixes with poorly graded aggregate and high volume of limestone filler[J]. Cement and Concrete Research, 2003, 33(9): 1279-1286. DOI:10.1016/S0008-8846(03)00013-9. [7] KADRI E H, AGGOUN S, DE SCHUTTER G, et al. Combined effect of chemical nature and fineness of mineral powders on Portland cement hydration[J]. Materials and Structures, 2010, 43(5): 665-673. [8] COURARD L, MICHEL F. Limestone fillers cement based composites: effects of blast furnace slags on fresh and hardened properties[J]. Construction and Building Materials, 2014, 51: 439-445. [9] WANG D H, SHI C J, FARZADNIA N, et al. A review on use of limestone powder in cement-based materials: Mechanism, hydration and microstructures[J]. Construction and Building Materials, 2018, 181: 659-672. [10] HUANG H, HUANG T J, YUAN Q, et al. Temperature dependence of structural build-up and its relation with hydration kinetics of cement paste[J]. Construction and Building Materials, 2019, 201: 553-562. [11] 中国建筑材料科学研究院水泥科学与新型建筑材料研究所. 水泥胶砂强度检验方法(ISO法): GB/T 17671—2021[S]. 北京: 中国标准出版社, 2021. China Building Materials Academy, Institute of Cement Science and New Building Materials. Test method of cement mortar strength(ISO method): GB/T 17671—2021[S]. Beijing: Standards Press of China, 2021. [12] HALL C. Water sorptivity of mortars and concretes: A review[J]. Magazine of Concrete Research, 1989, 41(147): 51-61. [13] THOMAS J J. A new approach to modeling the nucleation and growth kinetics of tricalcium silicate hydration[J]. Journal of the American Ceramic Society, 2007, 90(10): 3282-3288. [14] SCHERER G W, ZHANG J, THOMAS J J. Nucleation and growth models for hydration of cement[J]. Cement and Concrete Research, 2012, 42(7): 982-993. [15] LAWRENCE Philippe, CYR Martin, RINGOT Erick. Mineral admixtures in mortars[J]. Cement and Concrete Research, 2003, 33(12):1939-1947. [16] Van BREUGEL K. Simulation of hydration and formation of structure in hardening cement-based materials [D]. Delft University,1991. [17] HYDRATION Odleri. Setting and hardening of portland cement[J]. Lea′s Chemistry of Cement and Concrete, 1998. [18] ROUSSEL N, OVARLEZ G, GARRAULT S, et al. The origins of thixotropy of fresh cement pastes[J].Cement and Concrete Research, 2012, 42(1): 148-157. [19] MOSTAFA A M, YAHIA A. Physico-chemical kinetics of structural build-up of neat cement-based suspensions[J]. Cement and Concrete Research, 2017, 97: 11-27. [20] 鲍玖文, 胡文文, 张鹏, 等. 有机硅憎水剂对混凝土强度与毛细吸水性能的影响[J]. 硅酸盐学报, 2020, 48(10): 1644-1652. BAO Jiuwen, HU Wenwen, ZHANG Peng, et al. Effect of organic silicon hydrophobic agent on strength and capillary absorption of concrete[J]. Journal of the Chinese Ceramic Society, 2020, 48(10): 1644-1652. [21] POWERS Tc. Structure and physical properties of hardened portland cement paste[J]. Journal of the American Ceramic Society, 1958, 41(1): 1-6. [22] RÜBNER K, HOFFMANN D. Characterization of mineral building materials by mercury-intrusion porosimetry[J]. Particle & Particle Systems Characterization, 2006, 23(1): 20-28. [23] 郭剑飞. 混凝土孔结构与强度关系理论研究[D]. 杭州: 浙江大学, 2004. GUO Jianfei. Theoretical study on the relationship between pore structure and strength of concrete[D]. Hangzhou: Zhejiang University, 2004.

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