海水集料混凝土抗压强度及配合比试验研究

Experimental Study on Compressive Strength and Mixture Ratio of Seawater absorbing Aggregate

海水集料混凝土利用球形SAP形成内部球孔,是一种基于内部孔结构的新型混凝土。对水泥用量、球形SAP体积分数、水胶比和复合外加剂质量分数4个因素,各取4个水平进行正交试验,采用极差分析和方差分析归纳各因素对海水集料混凝土抗压强度的影响。结果表明:球形SAP体积分数对抗压强度的影响最大,其次是水泥用量和水胶比,复合外加剂质量分数的影响最小。在正交试验的基础上,将海水集料混凝土中球形SAP体积率视为孔隙率,得到一系列抗压强度的回归关系式,提出基于经验公式的海水集料混凝土配合比设计方法。

Seawater-absorbing aggregate concrete is a new type of concrete with internal pore structure by bringing in spheri- cal SAP. Such four factors as cement dosage, seawater-absorbing aggregate dosage, water-binder ratio and compound admixtures content were considered in an orthogonal test with four levels adopted in each factor. Range analysis and variance analysis were used to conclude individual factors which produced an effect on compressive strength of seawater-absorbing aggregate concrete. Re- search showed that the compressive strength of concrete was mostly affected by seawater-absorbing aggregate dosage, followed by ce- ment dosage and water-binder ratio, and compound admixtures content was the least significant one. Finally, based on the orthogo- hal test, with spherical SAP volume fraction as porosity, a series of regression relationships of compression strength were derived, and the mixture ratio design method of seawater-absorbing aggregate is proposed on the basis of empirical formula.