Mechanism of expansion in hardened cement pastes with hard-burnt free lime

Min Deng; Dongwen Hong; Xianghui Lan; Mingshu Tang

doi:10.1016/0008-8846(95)00030-5

Mechanism of expansion in hardened cement pastes with hard-burnt free lime

Min Deng, Dongwen Hong, Xianghui Lan, Mingshu Tang

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

Abstract

The expansion characteristics of hard-burnt free lime in cement pastes were determined by measurements of free linear length changes in various periods. Hydration of lime in water and in alkali solutions was investigated to evaluate the influence of OH^- ions on the migration of Ca²⁺ ions from lime, the supersaturation of solutions for Ca(OH)₂ and the size as well as the dispersion of distribution of Ca(OH)₂ crystals formed. Based on the experimental results, an expansion mechanism of hydrating lime in cement pastes was proposed. It is found that OH^- ion in pore solutions may force Ca(OH)₂ to form in situ and promote the development of expansive forces. The expansion of hydrating lime is caused by the crystallization of Ca(OH)₂ crystals formed in situ.

Original language	English
Pages (from-to)	440-448
Number of pages	9
Journal	Cement and Concrete Research
Volume	25
Issue number	2
DOIs	https://doi.org/10.1016/0008-8846(95)00030-5
State	Published - Feb 1995

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title = "Mechanism of expansion in hardened cement pastes with hard-burnt free lime",

abstract = "The expansion characteristics of hard-burnt free lime in cement pastes were determined by measurements of free linear length changes in various periods. Hydration of lime in water and in alkali solutions was investigated to evaluate the influence of OH- ions on the migration of Ca2+ ions from lime, the supersaturation of solutions for Ca(OH)2 and the size as well as the dispersion of distribution of Ca(OH)2 crystals formed. Based on the experimental results, an expansion mechanism of hydrating lime in cement pastes was proposed. It is found that OH- ion in pore solutions may force Ca(OH)2 to form in situ and promote the development of expansive forces. The expansion of hydrating lime is caused by the crystallization of Ca(OH)2 crystals formed in situ.",

author = "Min Deng and Dongwen Hong and Xianghui Lan and Mingshu Tang",

year = "1995",

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doi = "10.1016/0008-8846(95)00030-5",

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T1 - Mechanism of expansion in hardened cement pastes with hard-burnt free lime

AU - Deng, Min

AU - Hong, Dongwen

AU - Lan, Xianghui

AU - Tang, Mingshu

PY - 1995/2

Y1 - 1995/2

N2 - The expansion characteristics of hard-burnt free lime in cement pastes were determined by measurements of free linear length changes in various periods. Hydration of lime in water and in alkali solutions was investigated to evaluate the influence of OH- ions on the migration of Ca2+ ions from lime, the supersaturation of solutions for Ca(OH)2 and the size as well as the dispersion of distribution of Ca(OH)2 crystals formed. Based on the experimental results, an expansion mechanism of hydrating lime in cement pastes was proposed. It is found that OH- ion in pore solutions may force Ca(OH)2 to form in situ and promote the development of expansive forces. The expansion of hydrating lime is caused by the crystallization of Ca(OH)2 crystals formed in situ.

AB - The expansion characteristics of hard-burnt free lime in cement pastes were determined by measurements of free linear length changes in various periods. Hydration of lime in water and in alkali solutions was investigated to evaluate the influence of OH- ions on the migration of Ca2+ ions from lime, the supersaturation of solutions for Ca(OH)2 and the size as well as the dispersion of distribution of Ca(OH)2 crystals formed. Based on the experimental results, an expansion mechanism of hydrating lime in cement pastes was proposed. It is found that OH- ion in pore solutions may force Ca(OH)2 to form in situ and promote the development of expansive forces. The expansion of hydrating lime is caused by the crystallization of Ca(OH)2 crystals formed in situ.

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U2 - 10.1016/0008-8846(95)00030-5

DO - 10.1016/0008-8846(95)00030-5

M3 - 文章

AN - SCOPUS:0029244730

SN - 0008-8846

VL - 25

SP - 440

EP - 448

JO - Cement and Concrete Research

JF - Cement and Concrete Research

IS - 2

ER -

Mechanism of expansion in hardened cement pastes with hard-burnt free lime

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