水泥类型对人工鱼礁混凝土耐久性的影响
Influence of Types of Cement on Durability of Artificial Reef Concrete
关键词:
人工鱼礁混凝土;硫铝酸盐水泥;海水;海砂;抗渗性
Key words:
Artificial reef concrete; Sulphoaluminate cement; Sea water; Sea sand; Impermeability
刊期:
2017年第4期
DOI:
文章编号:
1000-4637(2017)04-01-07
基金项目:
国家自然科学基金资助项目(41020101)
作者:
瞿 霜,季 韬,叶益龙,林旭健
单位:
福州大学土木工程学院,350108
摘要
摘 要:采用硅酸盐水泥、硫铝酸盐水泥以及两种水泥混合后配制人工鱼礁混凝土,研究水泥类型对人工鱼礁混凝土的耐久性的影响。试验中,采用氯离子渗透性和吸水率试验研究水泥类型对人工鱼礁混凝土渗透性的影响,结合孔结构和XRD等试验方法对混凝土微观结构进行测试和分析,研究不同水泥对混凝土性能的影响。研究结果表明:在标准养护下,采用硫铝酸盐水泥时海水海砂混凝土的骨料与水泥石界面得到明显改善,裂缝减少,孔结构优化;与普通混凝土相比,其抗压强度和劈拉强度分别增加了15.0%和11.9%,抗渗性也得到提高;而采用混合水泥会导致海水海砂混凝土内部的裂缝明显增多,骨料与水泥石界面变差,孔结构明显劣化,导致抗压强度、劈拉强度和抗渗性降低。
Abstract:With Portland cement, sulfate aluminate cement, and two kinds of cement mixture preparation of artificial reefs, the influence of the cement type on the durability of artificial reef concrete is researched. Using the chloride ion permeability test and water absorption test, the influence of the cement type on the permeability of artificial reefs concrete is studied. In combination with pore structure and XRD, the microstructure of concrete is tested and analyzed, to study the effect of different cement on concrete performance. The results show that under the standard curing, using sulfate aluminate cement, the sea sand concrete aggregate and cement interface get improved significantly, the crack reduced and pore structure optimized. Compared with ordinary concrete, its compressive strength and splitting tensile strength increased by 15.0% and 11.9% respectively, the penetration resistance is improved. Using mixed cement can cause the sea sand concrete internal cracks obviously increased, aggregate and cement interface, pore structure obvious degradation, reduce the compressive strength, splitting tensile strength and permeability resistance.
结论
(1)不同类型的水泥对于海水海砂混凝土性能的影响很大。采用硫铝酸盐水泥的海水海砂混凝土微观结构得到显著改善,密实度提高,其28d抗压强度比采用普通硅酸盐水泥的提高47.4%,在电通量方面降低47.0%;当采用硅酸盐水泥和硫铝酸盐水泥以1:1比例复掺形成的混合水泥时,海水海砂混凝土的微观结构变差,其28d抗压强度比单独采用硅酸盐水泥和硫铝酸盐水泥的海水海砂混凝土抗压强度分别降低了15.1%和42.4%,在电通量上分别提高了30.3%和145.6%。
(2)硫铝酸盐水泥、硅酸盐水泥以及这两者复掺形成的混合水泥对氯离子的固化能力都随养护龄期的增加而提高。在总氯离子含量相同的情况下,硫铝酸盐水泥的氯离子固化率最大,在28d时达到64.6%;在龄期1d时,硅酸盐水泥的氯离子固化率要稍微低于混合水泥的氯离子固化率,但在28d时,硅酸盐水泥的氯离子固化率达到45.1%,而混合水泥的氯离子固化率仅为30.2%。
参考文献
引用本文
瞿霜,季韬,叶益龙,等.水泥类型对人工鱼礁混凝土耐久性的影响[J].混凝土与水泥制品,2017(4):1-7.
QU S, JI T, YE Y L,et al.Influence of Types of Cement on Durability of Artificial Reef Concrete[J].China Concrete and Cement Products,2017(4):1-7.
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