合成过程中聚羧酸共聚物用量对纳米C-S-H晶核成核及其早强作用的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3128-3136.

合成过程中聚羧酸共聚物用量对纳米C-S-H晶核成核及其早强作用的影响

唐芮枫^1,2, 崔素萍², 杨飞华¹, 王肇嘉¹, 王子明²

1.北京建筑材料科学研究总院有限公司,固废资源化利用与节能建材国家重点实验室,北京 100041;
2.北京工业大学,材料科学与工程学院,北京 100124

收稿日期:2024-02-20 修订日期:2024-04-19 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 崔素萍,博士,教授。E-mail:cuisuping@bjut.edu.cn
作者简介:唐芮枫(1992—),男,博士,工程师。主要从事水泥混凝土化学外加剂及高性能水泥基材料的研究。E-mail:tangruifeng@bbma.com.cn
基金资助:
北京市科技计划(Z221100007522002)

Effect of Dosage of Polycarboxylate Copolymer Used in Synthesis Process on Nucleation and Early Strength of Nano C-S-H Seeds

TANG Ruifeng^1,2, CUI Suping², YANG Feihua¹, WANG Zhaojia¹, WANG Ziming²

1. State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Sciences Research, Beijing 100041, China;
2. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

Received:2024-02-20 Revised:2024-04-19 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 纳米水化硅酸钙/聚羧酸共聚物(C-S-H/PCE)晶核悬浮液是一种新型水泥混凝土早强剂,可以通过晶种成核作用,缩短水泥水化诱导期,促进水泥早期强度的发展。本文通过动态光散射仪(DLS)、电子透射显微镜(TEM)、有机碳分析仪(TOC)及热重测试(TGA)研究了合成过程中PCE用量对纳米C-S-H/PCE晶粒尺寸、形貌及PCE实际结合量的影响,并探究了不同用量PCE制备的纳米C-S-H/PCE晶核对水泥水化放热速率、流动性及早期强度的影响。结果表明:当PCE用量占纳米C-S-H/PCE晶核悬浮液的质量分数小于5.0%时,纳米C-S-H/PCE晶核平均粒径随着PCE用量的增加逐渐降低,团聚情况改善,呈现清晰的锡箔状形貌;当PCE用量增加到10.0%时,纳米C-S-H/PCE晶核粒径和形貌变化不大。TOC和TGA测试表明PCE用量为5.0%时,其在C-S-H上基本达到饱和吸附量。过量的PCE会降低纳米C-S-H/PCE晶核对水泥水化放热和早期强度的促进作用。

关键词: 纳米晶核, 水化硅酸钙, 聚羧酸减水剂, 早期强度, 水泥水化, 吸附

Abstract: Nano hydrated calcium silicate/polycarboxylate copolymer (C-S-H/PCE) crystal nucleus suspension is a new type of early strength agent for cement concrete. It can shorten the cement hydration induction period and promote the development of early strength of cement through crystal seed nucleation. This article investigated the effect of PCE dosage on the grain size, morphology, and PCE actual combined dosage of nano C-S-H/PCE using dynamic light scattering (DLS), electron transmission microscopy (TEM), organic carbon analyzer (TOC), and thermogravimetric analysis (TGA) during the synthesis process. The effects of different dosages of PCE on the hydration heat release rate, flowability, and early strength of cement with nano C-S-H/PCE seeds were also investigated. The results show that when the PCE dosage accounted for less than 5.0% of the mass fraction of nano C-S-H/PCE seeds suspension, the average particle size of nano C-S-H/PCE seeds gradually decreases with the increase of PCE dosage, and the agglomeration situation improves, gradually presenting a clear tin foil like morphology. When the amount of PCE increases to 10.0%, there is little change in the particle size and morphology of the nano C-S-H/PCE seeds. TOC and TGA tests show that when the PCE dosage is 5.0%, it basically reaches saturation adsorption capacity on C-S-H. Therefore, excessive PCE will reduce the promoting effect of nano C-S-H/PCE seeds on the hydration heat release and early strength of cement.

Key words: nano seed, calcium silicate hydrate, polycarboxylate superplasticizer, early strength, cement hydration, adsorption

中图分类号:

TU528

唐芮枫, 崔素萍, 杨飞华, 王肇嘉, 王子明. 合成过程中聚羧酸共聚物用量对纳米C-S-H晶核成核及其早强作用的影响[J]. 硅酸盐通报, 2024, 43(9): 3128-3136.

TANG Ruifeng, CUI Suping, YANG Feihua, WANG Zhaojia, WANG Ziming. Effect of Dosage of Polycarboxylate Copolymer Used in Synthesis Process on Nucleation and Early Strength of Nano C-S-H Seeds[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3128-3136.

参考文献

[1] DU Q, PANG Q Y, BAO T N, et al. Critical factors influencing carbon emissions of prefabricated building supply chains in China[J]. Journal of Cleaner Production, 2021, 280: 124398.
[2] YUAN M Q, LI Z F, LI X D, et al. How to promote the sustainable development of prefabricated residential buildings in China: a tripartite evolutionary game analysis[J]. Journal of Cleaner Production, 2022, 349: 131423.
[3] 张朝阳, 蔡熠, 孔祥明, 等. 纳米C-S-H对水泥水化、硬化浆体孔结构及混凝土强度的影响[J]. 硅酸盐学报, 2019, 47(5): 585-593.
ZHANG C Y, CAI Y, KONG X M, et al. Influence of nano C-S-H on cement hydration, pore structure of hardened cement pastes and strength of concrete[J]. Journal of the Chinese Ceramic Society, 2019, 47(5): 585-593 (in Chinese).
[4] WANG F, KONG X M, JIANG L F, et al. The acceleration mechanism of nano-C-S-H particles on OPC hydration[J]. Construction and Building Materials, 2020, 249: 118734.
[5] DAS S, RAY S, SARKAR S. Early strength development in concrete using preformed C-S-H nano crystals[J]. Construction and Building Materials, 2020, 233: 117214.
[6] 唐芮枫, 张佳乐, 王子明, 等. C-S-H纳米晶种及其对水泥水化硬化的促进作用综述[J]. 材料导报, 2023, 37(9): 109-124.
TANG R F, ZHANG J L, WANG Z M, et al. C-S-H nano-seed and its promoting effect on cement hydration and hardening: a review[J]. Materials Reports, 2023, 37(9): 109-124 (in Chinese).
[7] KANCHANASON V, PLANK J. C-S-H-PCE Nanocomposites for enhancement of early strength of portland cement[C]// The 14th International Congress on the Chemistry of Cement (ICCC 2015), 2015.
[8] KANCHANASON V, PLANK J. Effectiveness of a calcium silicate hydrate-polycarboxylate ether (C-S-H-PCE) nanocomposite on early strength development of fly ash cement[J]. Construction and Building Materials, 2018, 169: 20-27.
[9] KANCHANASON V, PLANK J. Effect of calcium silicate hydrate-polycarboxylate ether (C-S-H-PCE) nanocomposite as accelerating admixture on early strength enhancement of slag and calcined clay blended cements[J]. Cement and Concrete Research, 2019, 119: 44-50.
[10] SUN J F, SHI H, QIAN B B, et al. Effects of synthetic C-S-H/PCE nanocomposites on early cement hydration[J]. Construction and Building Materials, 2017, 140: 282-292.[11] ZHANG J, WANG Z, YAO Y, et al. The effect and mechanism of C-S-H-PCE nanocomposites on the early strength of mortar under different water-to-cement ratio[J]. Journal of Building Engineering, 2021, 44: 103360.
[12] 雷凤珍, 雷蕾, 康阳阳, 等. 聚羧酸减水剂的酸醚比对水化硅酸钙晶种早强作用的影响[J]. 硅酸盐学报, 2023, 51(7): 1649-1659.
LEI F Z, LEI L, KANG Y Y, et al. Impact of acid ether ratio of polycarboxylate ether on early strength enhancement of calcium silicate hydrate seed[J]. Journal of the Chinese Ceramic Society, 2023, 51(7): 1649-1659 (in Chinese).
[13] 王学川, 钱珊珊, 王子明, 等. 硅烷减水剂对水化硅酸钙晶核粒径调控[J]. 硅酸盐学报, 2022, 50(11): 2818-2825.
WANG X C, QIAN S S, WANG Z M, et al. Effect of organosilane-modified polycarboxylate superplasticizers on grain size of calcium silicate hydrate seeds[J]. Journal of the Chinese Ceramic Society, 2022, 50(11): 2818-2825 (in Chinese).
[14] KANCHANASON V, PLANK J. Role of pH on the structure, composition and morphology of C-S-H-PCE nanocomposites and their effect on early strength development of Portland cement[J]. Cement and Concrete Research, 2017, 102: 90-98.
[15] 相国磊, 王训. 纳米晶核的尺寸与表面对生长与组装过程影响的研究进展[J]. 无机化学学报, 2011, 27(12): 2323-2331.
XIANG G L, WANG X. Size and surface effects of nuclei on the growth and assembly of nanostructures[J]. Chinese Journal of Inorganic Chemistry, 2011, 27(12): 2323-2331 (in Chinese).
[16] CHOWDHURY B. Investigations into the role of activated carbon in a moisture-blocking cement formulation[J]. Journal of Thermal Analysis and Calorimetry, 2004, 78(1): 215-226.
[17] VIALLIS-TERRISSE H, NONAT A, PETIT J C. Zeta-potential study of calcium silicate hydrates interacting with alkaline cations[J]. Journal of Colloid and Interface Science, 2001, 244(1): 58-65.