Laboratory Study on Producing Foam Mixed Lightweight 
Soil from Barren Phosphorus Slag

doi:10.3969/j.issn.1674-0696.2017.05.10

Abstract

Abstract: Laboratory study was used to study the technology and performance of producing foam mixed lightweight soil from phosphorus slag. The results show that: when the foam is produced by foaming machine, the stability of Coconut oil fatty acryl diethanolamine ［C11H23CON(CH2CH2OH)2］ is better than that of sodium dodecyl sulfate ［CH3(CH2)10CH2-OSO3Na］, and the optimal concentration of AES is 3%. Leaving mortar stationary is helpful to the reduction of de-foaming and the optimal time before being mixed with foam is 60~90 min after leaving mortar stationary. The density of phosphorus slag foam mixed lightweight soil is mainly influenced by foam content, and the appropriate foam content is 100%~200% in practical engineering. The unconfined compression strength is increased with the increase of cement content, and decreased with the increase of foam content. The 28d unconfined compression strength can reach 1.5 MPa and even above, which can be used for roadbed filling, mine pit backfilling, building backfilling and etc. The strength will be greatly increased after 28 days.

Key words: geotechnical engineering, slag, lightweight soil, foaming agent, subgrade, mine pit

摘要： 利用室内试验对磷矿渣生产气泡混合轻质土的生产技术和性能进行了研究，发现在采用发泡机生产气泡时，尼纳尔的稳定性优于十二烷基磺酸钠，AES的最佳浓度为3%。砂浆静置有利于减少消泡，最佳气泡掺入时间为砂浆静置60~90 min后。磷矿渣气泡混合轻质土的密度主要受气泡添加量的影响，实际工程中适宜气泡添加量为100%~200%；无侧限抗压强度随水泥含量的增加而增加，随气泡添加量的增加而减小，28 d强度可达1.5 MPa以上，可用于路基填筑、矿坑回填、建筑物回填土等，28 d后还会大幅增加。

关键词: 岩土工程, 矿渣, 轻质土, 发泡剂, 路基, 矿坑

CLC Number:

U416
TU58

LI Mingdong1, 2, FAN Gongjun3, JI Fengling4, TIAN Anguo1. Laboratory Study on Producing Foam Mixed Lightweight Soil from Barren Phosphorus Slag[J]. Journal of Chongqing Jiaotong University(Natural Science), 2017, 36(5): 51-56.

李明东1,2，范公俊3，姬凤玲4，田安国1. 瘠性磷矿渣生产气泡混合轻质土的试验研究[J]. 重庆交通大学学报（自然科学版）, 2017, 36(5): 51-56.

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Laboratory Study on Producing Foam Mixed Lightweight Soil from Barren Phosphorus Slag

瘠性磷矿渣生产气泡混合轻质土的试验研究

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