脱硫石膏水泥稳定碎石减缩与增强行为机制

doi:10.13229/j.cnki.jdxbgxb20200242

吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (1): 252-258.doi: 10.13229/j.cnki.jdxbgxb20200242

• 交通运输工程·土木工程 • 上一篇

脱硫石膏水泥稳定碎石减缩与增强行为机制

陆青清^1,²()

^1.同济大学道路与交通工程教育部重点试验室，上海 201804
^2.上海公路桥梁（集团）有限公司，上海 200433

收稿日期:2020-04-08 出版日期:2021-01-01 发布日期:2021-01-20
作者简介:陆青清（1984-），男，高级工程师，博士. 研究方向：路面工程材料与施工工艺.E-mail:lqq6677@163.com
基金资助:
国家自然科学基金项目(51708342)

Strength enhancement and shrinkage reduction mechanism of desulfurized gypsum cement stabilized aggregates

Qing-qing LU^1,²()

^1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji University，Shanghai 201804，China
^2.Shanghai Road and Bridge（Group） Co. Ltd. ，Shanghai 200433，China

Received:2020-04-08 Online:2021-01-01 Published:2021-01-20

摘要/Abstract

摘要：

采用抗压强度、抗折强度、干缩温缩、扫描电镜、X射线衍射试验，评价脱硫石膏矿渣水泥稳定碎石的变形特性与强度特征。结果表明：在胶凝体系中，脱硫石膏置换出铝酸钙结晶过程中消耗的氢氧化钙，促进火山灰反应，提高胶凝强度；将铝酸钙晶体转化为钙矾石，实现体积微膨胀，减小收缩变形；脱硫石膏、矿渣存在较佳的掺比例，对于中粒式骨架密实型混合料，矿渣掺量不低于水泥剂量，脱硫石膏掺量在3.0%~6.0%范围内。

关键词: 脱硫石膏, 矿渣, 水泥稳定碎石, 收缩特性, 强度特征

Abstract:

Desulfurization gypsum is a kind of industrial wastes. When mixed with fly ash and slag， it can enhance the reaction efficiency， increase the cohesiveness of cementation systems and reduce the amount of cement. Furthermore， gypsum cement gel material has a slight expansion function， which contributes to improving the compactness of materials， delaying the shrinkage cracking. Currently， gypsum is just used as roadbed filler， which can not fully play its performance. Based on this background， in this paper， the gypsum cement stabilized aggregate formation mechanism and its engineering application were investigated to identify the mechanism of “excitation”， “enhancement” and “reduction” of shrinkage. Referring to the cement performance test， the effects of gypsum on the retarding effect， strength characteristics and stability of the composite gel system were analyzed. Scanning electron microscope images and X-ray diffraction patterns were applied to reveal the mechanism of the effect of gypsum on the chemical reaction of composite gel system. The results reveal the volumetric micro-swelling and the three-stage development of the composite gel system. The feature of volume swell is derived from the crystallization of gypsum and the formation of ettringite. The three-stage strength development characteristics are derived from the excitation of desulfurization gypsum to active ingredients in the slag， crystallization pressure generated by the ettringite formation， and gypsum filling. For medium-particle composite stabilized aggregates， the proportion of slag should not be lower than the proportion of cement incorporation and the proportion of gypsum should not be less than 3.0%， not be more than 6.0%.

Key words: flue-gas desulfurization gypsum, blast furnace slag, cement stabilized aggregate, shrinkage characteristics, strength characteristics

中图分类号:

TQ172

陆青清. 脱硫石膏水泥稳定碎石减缩与增强行为机制[J]. 吉林大学学报(工学版), 2021, 51(1): 252-258.

Qing-qing LU. Strength enhancement and shrinkage reduction mechanism of desulfurized gypsum cement stabilized aggregates[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(1): 252-258.

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名称	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	其他
脱硫石膏	3.1	4.2	6.1	28.1	9.7	43.6	5.2
矿渣	32.8	14.8	1.1	37.8	8.5	0.7	4.3
水泥	26.5	9.1	4.9	47.4	3.3	1.0	7.8

各类材料质量/g				脱硫石膏掺配比/%
水泥	矿渣	砂	脱硫石膏	脱硫石膏掺配比/%
225	225	1350	0	0
225	225	1327.5	22.5	5
225	225	1305	45	10
225	225	1260	90	20
225	225	1215	135	30
225	225	1215	225	50
225	225	1080	270	60
225	225	1012.5	337.5	75
225	225	945	405	90
225	225	900	450	100
225	225	787.5	562.5	125
225	225	675	675	150
225	225	562.5	787.5	175
225	225	450	900	200

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脱硫石膏水泥稳定碎石减缩与增强行为机制

Strength enhancement and shrinkage reduction mechanism of desulfurized gypsum cement stabilized aggregates

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