脱硫石膏钢渣无熟料水泥对软土固化效果的研究
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摘要
利用脱硫石膏钢渣无熟料水泥固化软土,既可以充分利用工业废渣,又能减少水泥的用量,保护自然资源。通过研究在不同掺入比和不同龄期时固化土的无侧限抗压强度,分析了掺入比、龄期对固化土强度的影响。试验结果表明,脱硫石膏无熟料水泥固化早期强度较低,与水泥相比不同掺入比时随龄期的增长固化强度变化较大。当脱硫石膏钢渣无熟料水泥的掺入比较水泥的掺入比大5%时,在龄期达到28 d以后,其固化强度与水泥土的固化强度相当。
The use of desulphurization gypsum,steel slag and clinker cement to solidify soft soil can not only make full use of industrial waste residue,but also reduce the amount of cement and protect natural resources. The test results of unconfined compressive strength of solidified soil at different mixing ratio and different age are studied. The date of unconfined compressive strength show that the stabilizing effect of the GSC is inferior to cement on early age,but the strength increase of GSC is faster than cement.When mixing ratios of GSC is 5% more than the mixing ratios of cement,after 28 d,it has the same curing strength as cement soil.
The use of desulphurization gypsum,steel slag and clinker cement to solidify soft soil can not only make full use of industrial waste residue,but also reduce the amount of cement and protect natural resources. The test results of unconfined compressive strength of solidified soil at different mixing ratio and different age are studied. The date of unconfined compressive strength show that the stabilizing effect of the GSC is inferior to cement on early age,but the strength increase of GSC is faster than cement.When mixing ratios of GSC is 5% more than the mixing ratios of cement,after 28 d,it has the same curing strength as cement soil.
引文
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[2] Pan Z,Cheng L,Lu Y,et al. Hydration products of alkali-activated slag-red mud cementitious material[J]. Cement&Concrete Research,2002,32(3):357-362.
[3] Liu Q,Liu J,Qi L. Effects of temperature and carbonation curing on the mechanical properties of steel slag-cement binding materials[J].Construction&Building Materials,2016,124:999-1006.
[4] Lei D Y,Guo L P,Sun W,et al. Study on properties of untreated FGD gypsum-based high-strength building materials[J]. Construction&Building Materials,2017,153:765-773.
[5] Papageorgiou A,Tzouvalas G,Tsimas S. Use of inorganic setting retarders in cement industry[J]. Cement and Concrete Composites,2005,27(2):183.
[6] Tzouvalas G,Rantis G,Tsimas S. Alternative calcium-sulfate-bearing materials as cement retarders:PartⅡ. FGD gypsum[J]. Cement and Concrete Research,2004,34(11):2119.
[7] Hulusi M,Ozkul. Utilization citro 2 and desulphogypsum as set retarders in Portland cement[J]. Cement and Concrete Reserch,2000,30:1755.
[8] Caillahua M C,Moura F J. Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement[J]. Journal of Materials Research&Technology,2017,7(2):190-197.
[9]朱志铎,刘松玉,孙海军.江苏徐宿地区粉土的基本特性及加固方法研究[J].岩土力学,2004,25(7):1155-1158.
[10]吴恒,代志宏,张信贵,等.水土作用中铝对土体结构性的影响[J].岩土力学,2001,22(4):474-477.
[11]黄新,胡同安.水泥-废石膏加固软土的试验研究[J].岩土工程学报,1998,20(5):72-76.
[12]董邑宁,张青娥,徐日庆,等.固化剂对软土强度影响的试验研究[J].岩土力学,2008,29(2):475-478.
[13]黄新,周国钧.水泥加固土硬化机理初探[J].岩土工程学报,1994,16(1):62-68.