Effect of calcined phosphogypsum on hydration process of autoclaved silicate products

LU Jinchi; LI Dongnan; CHEN Kai; HUANG Jinlin

doi:10.3969/j.issn.0438-1157.2012.07.048

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Effect of calcined phosphogypsum on hydration process of autoclaved silicate products

更新时间：2025-12-10

- Effect of calcined phosphogypsum on hydration process of autoclaved silicate products
- CIESC Journal Issue 7, Pages: 2317-2323(2012)
- 作者机构：
  
  华南农业大学水利与土木工程学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.07.048
  CLC： Q177.3+9
- Online First：05 July 2012，
  
  Published：05 July 2012
- 稿件说明：
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LU Jinchi, LI Dongnan, CHEN Kai, et al. Effect of calcined phosphogypsum on hydration process of autoclaved silicate products[J]. CIESC Journal, 2012, (7): 2317-2323.
DOI：

LU Jinchi, LI Dongnan, CHEN Kai, et al. Effect of calcined phosphogypsum on hydration process of autoclaved silicate products[J]. CIESC Journal, 2012, (7): 2317-2323. DOI： 10.3969/j.issn.0438-1157.2012.07.048.

摘要

磷石膏经高温煅烧改性后与粉煤灰、砂粉、石灰及水泥熟料等制备蒸压硅酸盐制品，研究了不同温度煅烧的磷石膏对蒸压硅酸盐制品水化过程的影响，用蒸压制品中未反应的Ca(OH)2量及结合水量分析它们的反应速率，用XRD测定蒸压硅酸盐制品的水化产物，并结合SEM分析，结果表明，经煅烧的磷石膏对蒸压硅酸盐制品的水化有明显的促进作用，托勃莫来石与C-S-H(1)等水化产物的迅速生长而形成密实的水化产物结构是其增强蒸压硅酸盐制品的根本原因。

Abstract

The effects of calcined phosphogypsum on the hydration process of the autoclaved silicate products were investigated in this paper.The influence of adding phosphogypsum calcined at different temperatures on the hydration rate of autoclaved silicate products was analyzed for un-reacted Ca(OH)2 content and combined water.The hydrates were determined with XRD and SEM.It was found that the hydration of autoclaved silicate products with added phosphogypsum calcined over 500℃ was greatly improved.The hydrates of the autoclaved silicate products with added phosphogypsum calcined over 500℃ had more un-reacted Ca(OH)2 content and combined water in the same curing time

and the research indicated that adding phosphogypsum calcined over 500℃ could also reinforce the compressive strength of autoclaved silicate products.It was pointed out that the aluminate phase present in the raw materials cannot hydrate to form more ettringite during autoclaved curing

and rapid formation of such hydrates as calcium silicate hydrate (1) and tobermorite with a more compact structure is the main reason for strengthening autoclaved silicate products.

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