纳米SiO2-水泥复合胶凝材料早期水化动力学研究

doi:10.19964/j.issn.1006-4990.2023-0435

Abstract

Abstract:

The effects of nano-SiO₂（NS） on the initial and final setting time，compressive strength，flexural strength and hydration heat of NS cement composite cementitious system were studied by partial replacement of cement with nano NS.The hydration characteristics of NS cement composite cementitious system were analyzed by hydration heat，and the hydration reaction mechanism of NS cement composite cementitious system was analyzed based on Krstulović-Dabić Hydration kinetics model.The results showed that after replacement of cement with nano NS，the initial and final setting time of cement was advanced，the compressive strength of cement mortar at different ages was improved，but the fluidity of cement mortar was reduced.NS promoted the reaction rate of the hydration reaction of NS cement composite cementitious system in the early induction period，induction period，acceleration period and deceleration period，and the third exothermic peak appeared in the deceleration period，which made the acceleration period and deceleration period end ahead of schedule.NS significantly improved the reaction degree of crystal nucleation and crystal growth（NG），phase boundary reaction（I） and diffusion stage（D），reduced the proportion of stage I in the whole hydration process，speeded up the transformation from stage I to stage D，reduced the porosity and permeability in the slurry，increased the hydration resistance and advanced the stability period.

Key words: nano-SiO₂, cement mortar, compressive strength, cement hydration, hydration kinetics, Krstulovi?-Dabi? model

CLC Number:

TQ127.2

CHENG Ziyang, CHEN Guofu. Early hydration kinetics research of nano-SiO₂ and cement composite cementitious materials[J]. Inorganic Chemicals Industry, 2024, 56(7): 80-87.

Figures/Tables 11

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References 25

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类型	原材料用量/（kg·m^-3）
类型	水	水泥	细骨料	NS
CMNS0	225	450.0	1 350	0.0
CMNS1	225	445.5	1 350	4.5
CMNS2	225	441.0	1 350	9.0
CMNS3	225	436.5	1 350	13.5

样品	初凝时间/ min	终凝时间/ min	标准稠度用水量/%	安定性
CMNS0	238	292	25.6	符合
CMNS1	213	262	26.8	符合
CMNS2	193	236	28.5	符合
CMNS3	172	208	29.6	符合

样品	最大放热速率/（mW·g^-1）	最大放热时间/h	3 d放热量/（J·g^-1）	理论计算Q_max/（J·g^-1）
CMNS0	2.60	13.77	256.88	361.04
CMNS1	2.66	12.74	257.66	359.71
CMNS2	2.67	12.49	259.44	350.87
CMNS3	2.70	12.57	263.11	347.22

样品	n	K₁′	K₂′	K₃′	类型	α₁	α₂	α₂-α₁
CMNS0	1.972 7	0.036 4	0.009 6	0.001 71	NG-I-D	0.160 7	0.245 0	0.084 3
CMNS1	1.873 7	0.038 2	0.010 2	0.001 79	NG-I-D	0.164 6	0.237 6	0.072 9
CMNS2	1.772 1	0.038 4	0.010 6	0.001 85	NG-I-D	0.185 4	0.239 5	0.054 1
CMNS3	1.703 9	0.037 5	0.010 7	0.001 86	NG-I-D	0.200 0	0.239 8	0.039 8

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Early hydration kinetics research of nano-SiO₂ and cement composite cementitious materials

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Early hydration kinetics research of nano-SiO2 and cement composite cementitious materials