不同侧链密度PCE制备的C-S-H/PCE结构及其对水泥早期水化的影响

殷素红, 杨幸霖, 冯献, 等

doi:10.12141/j.issn.1000-565X.220176

华南理工大学学报(自然科学版) >

2023 , Vol. 51 >Issue 1: 76 - 83

DOI: https://doi.org/10.12141/j.issn.1000-565X.220176

材料科学与技术

不同侧链密度PCE制备的C-S-H/PCE结构及其对水泥早期水化的影响

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华南理工大学材料科学与工程学院，广东广州 510640

殷素红（1971-），女，博士，教授，主要从事水泥混凝土材料、绿色低碳建筑材料、碱激发胶凝材料、固体废弃物建材资源化利用等的研究。

收稿日期: 2022-04-06

网络出版日期: 2022-05-05

基金资助

广东省科技计划项目(2017B020238004);广东省住房与城乡建设厅2021年科技创新计划项目(2021-K20-512247)

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Structure of C-S-H/PCE Prepared from PCE with Different Side Chain Densities and Its Effects on Early Hydration Properties of Cement

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School of Materials Science and Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China

殷素红（1971-），女，博士，教授，主要从事水泥混凝土材料、绿色低碳建筑材料、碱激发胶凝材料、固体废弃物建材资源化利用等的研究。

Received date: 2022-04-06

Online published: 2022-05-05

Supported by

the Science and Technology Planning Project of Guangdong Province(2017B020238004)

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摘要

装配式建筑的发展使得在预制件生产中使用早强剂的需求越发强烈，人工合成水化硅酸钙（C-S-H）作为一种新型晶种早强剂，能够显著提高水泥基材料的早期强度，但其较差的分散性限制了其应用。文中以不同侧链密度聚羧酸减水剂（PCE）作为分散剂，通过共沉淀法合成了一系列C-S-H/PCE晶种早强剂，利用X射线衍射分析仪（XRD）、傅里叶红外光谱（FT-IR）、纳米粒度仪（DLS）等探究其对C-S-H晶种结构的影响，并深入研究了C-S-H/PCE晶种早强剂对水泥水化行为、硬化体强度和组成结构的影响。结果表明：PCE的侧链密度越小，C-S-H晶种分散得越好，粒径越小，中位粒径可达339.5 nm，晶种颗粒数量增多，可提供更多的成核位点；掺入C-S-H/PCE能显著加速水泥水化，使水化加速期放热峰提前1.3 h，8 h放热量增加10.8%；掺入C-S-H/PCE后，水泥净浆8 h和1 d龄期硬化体的孔隙率降低，抗压强度分别提高13%和15%。

关键词： 人工合成水化硅酸钙; 聚羧酸减水剂; 侧链密度; 水泥; 早期水化

本文引用格式

殷素红, 杨幸霖, 冯献, 等 . 不同侧链密度PCE制备的C-S-H/PCE结构及其对水泥早期水化的影响[J]. 华南理工大学学报(自然科学版), 2023 , 51(1) : 76 -83 . DOI: 10.12141/j.issn.1000-565X.220176

Abstract

The development of prefabricated buildings increases the demand for using early strong agents in the production of prefabrication. As a new type of crystal early strength agent, synthetic calcium silicate hydrate (C-S-H) can significantly enhance the early strength of cement-based materials, but its poor dispersibility limits its application. In this paper, the polycarboxylate superplasticizers (PCE) with different side chain density were used as a dispersant to synthesis a series of C-S-H/PCE by means of co-precipitation method. The influence of C-S-H/PCE on the structure of C-S-H was studied with XRD, FT-IR, DLC. Moreover, its influence on the cement hydration behavior, hardened body strength and composition structure was investigated. The results show that the smaller the side chain density of PCE, the better the dispersion of C-S-H seeds and the smaller the particle size; the median particle size can reach 339.5 nm; the increase of the number of seed particles can provide more nucleation sites. The incorporation of C-S-H/PCE can significantly accelerate cement hydration, advance the exothermic peak of hydration acceleration by 1.3 h, and increase the heat release by 10.8% at 8 h. After the incorporation of C-S-H/PCE, the porosity of the hardenite of the cement slurry decreases at 8 h and 1 d and the compressive strength increases by 13% and 15%, respectively.

Key words： synthetic calcium silicate hydrate; polycarboxylate superplasticizer; side chain density; cement; early hydration

参考文献

1	ZHANG G， YANG Y Z， LI H M ．Calcium-silicate-hydrate seeds as an accelerator for saving energy in cold weather concreting［J］．Construction and Building Materials，2020，264：120191．
2	ZOU F B， HU C L， WANG F Z，et al ．Enhancement of early-age strength of the high content fly ash blended cement paste by sodium sulfate and C-S-H seeds towards a greener binder［J］．Journal of Cleaner Production，2020，244：118566．
3	LI J Q， ZHANG W X， XU K，et al ．Fibrillar calcium silicate hydrate seeds from hydrated tricalcium silicate lower cement demand［J］．Cement and Concrete Research，2020，137：106195．
4	HUANG L M， YANG Z H ．Hydration kinetics of tricalcium silicate with the presence of portlandite and calcium silicate hydrate［J］．Thermochimica Acta，2019，681：178398．
5	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．
6	胡建伟，谢永江，刘子科，等．纳米C—S—H/PCE对硅酸盐-硫铝酸盐复合水泥凝结硬化的影响［J］．土木与环境工程学报（中英文），2021，43（2）：138-147．
6	HU Jianwei， XIE Yongjiang， LIU Zike，et al ．Effect of nano C—S—H/PCE on the setting and hardening process of ortland-sulphoaluminate composite cement［J］．Journal of Civil and Environmental Engineering，2021，43（2）：138-147．
7	ZOU F B， TAN H B， GUO Y L，et al ．Effect of sodium gluconate on dispersion of polycarboxylate superplasticizer with different grafting density in side chain［J］．Journal of Industrial and Engineering Chemistry，2017，55：91-100．
8	NICOLEAU L， G?DT T， CHITU L，et al ．Oriented aggregation of calcium silicate hydrate platelets by the use of comb-like copolymers［J］．Soft Matter，2013，9（19）：4864-4874．
9	PLANK J， SCH?NLEIN M， KANCHANASON V ．Study on the early crystallization of calcium silicate hydrate （C-S-H） in the presence of polycarboxylate superplasticizers［J］．Journal of Organometallic Chemistry，2018，869：227-232．
10	SHU X， RAN Q P， LIU J P，et al ．Tailoring the solution conformation of polycarboxylate superplasticizer toward the improvement of dispersing performance in cement paste［J］．Construction and Building Materials，2016，116：289-298．
11	KANCHANASON V， PLANK J ．C-S-H-PCE Nanocomposites for enhancement of early strength of Portland cement［C］∥Proceedings of the 14th International Congress on the Chemistry of Cement．Beijing：［s.n.］，2015：13-16．
12	PEDROSA H C， REALES O M， REIS V D，et al ．Hydration of Portland cement accelerated by C-S-H seeds at different temperatures［J］．Cement and Concrete Research，2020，129：105978．
13	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．
14	RASHAD A M ．A synopsis about the effect of nano-Al₂O₃，nano-Fe₂O₃，nano-Fe₃O₄ and nano-clay on some properties of cementitious materials - a short guide for civil engineer［J］．Materials & Design （1980-2015），2013，52：143-157．
15	TAYLOR H F W ．Proposed structure for calcium silicate hydrate gel［J］．Journal of the American Ceramic Society，1986，69（6）：464-467．
16	PLANK J， LI H，ILG M，et al ．A microstructural analysis of isoprenol ether-based polycarboxylates and the impact of structural motifs on the dispersing effectiveness［J］．Cement and Concrete Research，2016，84：20-29．
17	SOBOLEV K ．Modern developments related to nanotechnology and nanoengineering of concrete［J］．Frontiers of Structural and Civil Engineering，2016，10（2）：131-141．
18	ZHANG Y R， KONG X M， LU Z C，et al ．Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism［J］．Cement and Concrete Research，2016，87：64-76．
19	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．
20	TAYLOR H F W ．Cement chemistry［M］．［S.l.］：Thomas Telford Publishing，1997．
21	JOHN E， MATSCHEI T， STEPHAN D ．Nucleation seeding with calcium silicate hydrate-a review［J］．Cement and Concrete Research，2018，113：74-85．
22	GAO Y， JING H W， ZHOU Z F，et al ．Reinforced impermeability of cementitious composites using graphene oxide-carbon nanotube hybrid under different water-to-cement ratios［J］．Construction and Building Materials，2019，222：610-621．
23	GARRAULT-GAUFFINET S， NONAT A ．Experimental investigation of calcium silicate hydrate （C-S-H） nucleation［J］．Journal of crystal growth，1999，200（3/4）：565-574．
24	HU J， GE Z， WANG K ．Influence of cement fineness and water-to-cement ratio on mortar early-age heat of hydration and set times［J］．Construction and Building Materials，2014，50：657-663．
25	NICOLEAU L ．Accelerated growth of calcium silicate hydrates： experiments and simulations［J］．Cement and Concrete Research，2011，41（12）：1339-1348．
26	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．
27	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．

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