CN116283085A - 一种抗裂混凝土制作方法 - Google Patents
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Abstract
本发明公开了一种抗裂混凝土制作方法,先向搅拌机中倒入骨料,然后开启搅拌机,向搅拌机中缓慢均匀地撒入纤维素纤维,完全撒入后继续搅拌1min;关闭搅拌机,向搅拌机中倒入胶凝材料和膨胀剂,然后开启搅拌机搅拌3min,添加矿粉有助于混凝土抗压强度的提升,而纤维素纤维则有助于混凝土劈裂强度和抗裂性能的提升;随着膨胀剂添加量的增加,抑制混凝土自收缩变形的效果越明显,混凝土的限制膨胀率越高;在粉煤灰和矿粉的填充效应、膨胀剂抑制裂缝产生以及纤维素纤维的内养护作用下,混凝土的抗渗性相比基准试验组得到有效提升。
Description
技术领域
本发明涉及抗裂混凝土技术领域,具体为一种抗裂混凝土制作方法。
背景技术
近年来随着预拌商品混凝土的发展,早期裂缝成为影响混凝土质量的主要问题之一,要控制混凝土的早期裂缝应从“防、放、抗”三方面着手,这就需要设计、施工和混凝土供应商共同协作,无论从主动控制的需要出发,还是从非荷载裂缝的成因看,材料措施及配合比设计技术均是控制混凝土收缩裂缝的最重要手段,因此本发明提出一种抗裂混凝土制作方法。
发明内容
为实现上述目的,本发明提供如下技术方案:一种抗裂混凝土制作方法,
S1:先向搅拌机中倒入骨料,然后开启搅拌机,向搅拌机中缓慢均匀地撒入纤维素纤维,完全撒入后继续搅拌1min;
S2:关闭搅拌机,向搅拌机中倒入胶凝材料和膨胀剂,然后开启搅拌机搅拌3min;
S3:将减水剂和水在干净容器中进行融合搅拌,然后缓慢倒入搅拌机中,混合溶液完全倒入后,继续搅拌1.5min;
S4:按照设备的养护要求进行试样养护。
优选的,所述水泥和掺合料在水化上相互促进,相互补充,能够很好改善混凝土的力学性能,在达到相同的设计强度可减少胶凝材料用量,而且矿物掺合料的二次水化可显著的改善混凝土的界面性能,提高混凝士的折压比,增加混凝土的抗裂性能,在颗粒级配上形成细度梯度,提高了混凝土的密实性。
优选的,所述混凝土的配制强度
fcu,o≥fcu,k+1.645σ
式中,fcu,k为混凝土立方体抗压强度标准值;σ为混凝土强度标准差。
优选的,所述采用内养护材料可以配制出工作性能良好的高强度混凝土,水胶比0.24内养护材料的体积掺量在20%以内可满足C60混凝土强度要求。
优选的,所述粉煤灰添加量为15%,矿粉添加量为15%,膨胀剂添加量为6%,纤维素纤维添加量为1.6kg/m3,在此配比下,混凝土的防水、抗裂和强度等综合性能最佳。
优选的,所述通过压力机实测,混凝土标准试件的抗压强度,压力机的示值精度为土1%、加荷速率为15~20kN/秒。
优选的,所述聚丙烯腈纤维对混凝土早期塑性收缩开裂具有良好的阻裂效果,混凝土中掺加0.1%聚丙烯腈纤维和0.5%钢纤维时,抗裂效果良好。
与现有技术相比,本发明的有益效果是:
本发明添加矿粉有助于混凝土抗压强度的提升,而纤维素纤维则有助于混凝土劈裂强度和抗裂性能的提升;随着膨胀剂添加量的增加,抑制混凝土自收缩变形的效果越明显,混凝土的限制膨胀率越高;在粉煤灰和矿粉的填充效应、膨胀剂抑制裂缝产生以及纤维素纤维的内养护作用下,混凝土的抗渗性相比基准试验组得到有效提升;
依据结构及施工特点,尽可能选用较大粒径的粗骨料、级配良好的粗细骨料及较小的砂率,以求能用较少的水泥浆量,满足和易性的要求,可根据实际情况选择较大粒径和较小粒径,较小的水泥浆量更有利于改善混凝土的抗裂性。
附图说明
图1为本发明抗裂混凝土制作流程图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明提供一种技术方案:一种抗裂混凝土制作方法,
S1:先向搅拌机中倒入骨料,然后开启搅拌机,向搅拌机中缓慢均匀地撒入纤维素纤维,完全撒入后继续搅拌1min;
S2:关闭搅拌机,向搅拌机中倒入胶凝材料和膨胀剂,然后开启搅拌机搅拌3min;
S3:将减水剂和水在干净容器中进行融合搅拌,然后缓慢倒入搅拌机中,混合溶液完全倒入后,继续搅拌1.5min;
S4:按照设备的养护要求进行试样养护。
水泥和掺合料在水化上相互促进,相互补充,能够很好改善混凝土的力学性能,在达到相同的设计强度可减少胶凝材料用量,而且矿物掺合料的二次水化可显著的改善混凝土的界面性能,提高混凝士的折压比,增加混凝土的抗裂性能,在颗粒级配上形成细度梯度,提高了混凝土的密实性;
混凝土的配制强度
fcu,o≥fcu,k+1.645σ
式中,fcu,k为混凝土立方体抗压强度标准值;σ为混凝土强度标准差。
混凝土强度标准差值
混凝土强度等级 | <C20 | C20≤·≤C20 | >C35 |
σ/MPa | 4.0 | 5.0 | 6.0 |
采用内养护材料可以配制出工作性能良好的高强度混凝土,水胶比0.24内养护材料的体积掺量在20%以内可满足C60混凝土强度要求,粉煤灰添加量为15%,矿粉添加量为15%,膨胀剂添加量为6%,纤维素纤维添加量为1.6kg/m3,在此配比下,混凝土的防水、抗裂和强度等综合性能最佳;
通过压力机实测,混凝土标准试件的抗压强度,压力机的示值精度为土1%、加荷速率为15~20kN/秒,聚丙烯腈纤维对混凝土早期塑性收缩开裂具有良好的阻裂效果,混凝土中掺加0.1%聚丙烯腈纤维和0.5%钢纤维时,抗裂效果良好。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (7)
1.一种抗裂混凝土制作方法,其特征在于:
S1:先向搅拌机中倒入骨料,然后开启搅拌机,向搅拌机中缓慢均匀地撒入纤维素纤维,完全撒入后继续搅拌1min;
S2:关闭搅拌机,向搅拌机中倒入胶凝材料和膨胀剂,然后开启搅拌机搅拌3min;
S3:将减水剂和水在干净容器中进行融合搅拌,然后缓慢倒入搅拌机中,混合溶液完全倒入后,继续搅拌1.5min;
S4:按照设备的养护要求进行试样养护。
2.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述水泥和掺合料在水化上相互促进,相互补充,能够很好改善混凝土的力学性能,在达到相同的设计强度可减少胶凝材料用量,而且矿物掺合料的二次水化可显著的改善混凝土的界面性能,提高混凝士的折压比,增加混凝土的抗裂性能,在颗粒级配上形成细度梯度,提高了混凝土的密实性。
3.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述混凝土的配制强度
fcu,o≥fcu,k+1.645σ
式中,fcu,k为混凝土立方体抗压强度标准值;σ为混凝土强度标准差。
4.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述采用内养护材料可以配制出工作性能良好的高强度混凝土,水胶比0.24内养护材料的体积掺量在20%以内可满足C60混凝土强度要求。
5.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述粉煤灰添加量为15%,矿粉添加量为15%,膨胀剂添加量为6%,纤维素纤维添加量为1.6kg/m3,在此配比下,混凝土的防水、抗裂和强度等综合性能最佳。
6.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述通过压力机实测,混凝土标准试件的抗压强度,压力机的示值精度为土1%、加荷速率为15~20kN/秒。
7.根据权利要求1所述的一种抗裂混凝土制作方法,其特征在于:所述聚丙烯腈纤维对混凝土早期塑性收缩开裂具有良好的阻裂效果,混凝土中掺加0.1%聚丙烯腈纤维和0.5%钢纤维时,抗裂效果良好。
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