CN117105609B - 一种无速凝剂辅助施工的超高性能喷射混凝土制配方法 - Google Patents
一种无速凝剂辅助施工的超高性能喷射混凝土制配方法 Download PDFInfo
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 16
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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Abstract
本发明提供一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,涉及超高性能喷射混凝土加工技术领域。所述超高性能喷射混凝土制配方法主要为采用水泥、河砂、粗骨料、膨胀剂、微硅粉、改性石英砂、纳米氧化铝、纳米碳酸钙、聚丙烯纤维、复合改性硅藻土、稳定增稠剂、水混合制备。本发明克服了现有技术的不足,能够有效保证超高性能混凝土的喷射施工性能和固化效率的同时提升其抗压强度,增强超高性能混凝土的力学性能,提升建筑施工的安全性。
Description
技术领域
本发明涉及超高性能喷射混凝土加工技术领域,具体涉及一种无速凝剂辅助施工的超高性能喷射混凝土制配方法。
背景技术
混凝土是建筑行业常用的施工材料,随着建筑行业的快速发展,对建筑构件的品质要求也越来越高,而超高性能混凝土(UHPC)则是能够满足现阶段绝大部分施工要求的高性能新型混凝土材料,其具有超高强度、韧性和耐久性能够适用于混凝土的喷射施工。
UHPC中胶凝材料的水化行为与普通混凝土相似,但水化产物的物相发展又不完全相同。当在常温下养护时,UHPC早期强度发展缓慢,在此前提下往往采用速凝剂混合辅助施工来提升UHPC的凝固速率以及前期的强度发展效率,但是速凝剂的添加一定程度上会降低UHPC的流动性,影响UHPC的喷射施工性能,同时容易造成后续28d养护混凝土相关性能的降低,影响其使用寿命,所以选择无速凝剂辅助来完成喷射施工UHPC是一种有效的手段,所以如何保证UHPC的施工性能,以及固化效率和强度是现阶段对于喷射UHPC的一大研究方向。
发明内容
针对现有技术不足,本发明提供一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,能够有效保证超高性能混凝土的喷射施工性能和固化效率的同时提升其抗压强度,增强超高性能混凝土的力学性能,提升建筑施工的安全性。
为实现以上目的,本发明的技术方案通过以下技术方案予以实现:
一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,所述无速凝剂辅助施工的超高性能喷射混凝土制配方法为采用以下重量份原料进行配置:水泥300-360份、河砂240-280份、粗骨料100-200份、膨胀剂8-10份、微硅粉10-20份、改性石英砂40-60份、纳米氧化铝8-10份、纳米碳酸钙8-10份、聚丙烯纤维16-20份、复合改性硅藻土8-10份、稳定增稠剂2-4份、水100-120份;且混凝土的制备方法为将各原料混合搅拌均匀后加入水进行拌合充分再使用。
优选的,所述河砂的细度模数为1.6-2.4,所述粗骨料为粒径在10-30mm连续级配的碎石。
优选的,所述膨胀剂由以下重量份物质组成:氯化钠1.2份、硫代硫酸钠1.5份、拉开粉BX 0.3份、减水剂JN 0.4份、氯化铵0.8份、铝粉0.005份、铁粉 95份。
优选的,所述稳定增稠剂为淀粉醚和硅酸镁铝质量比2∶1混合得到。
优选的,所述改性石英砂的制备方法包括以下步骤:
S1-1、将石英砂采用酸液进行浸泡后,取出石英砂采用乙醇冲洗干净后干燥,得预处理石英砂;
S1-2、将无水乙醇混合去离子水后加入氨水,再加入预处理石英砂,边搅拌边向其中滴加正硅酸四乙酯,室温反应6h,离心得综合产物备用;
S1-3、将综合产物高温干燥后得改性石英砂。
优选的,所述步骤S1-1中酸液浸泡中酸液的pH为4.5-5.5,浸泡时间为40-60min。
优选的,所述步骤S1-2中各物质添加的质量比为:无水乙醇∶去离子水∶氨水∶预处理石英砂∶正硅酸四乙酯=4∶2.5∶0.6∶8∶0.1。
优选的,所述步骤S1-3中高温干燥处理的温度为120-160℃。
优选的,所述步骤复合改性硅藻土的制备方法包括以下步骤:
S2-1、将硅藻土加入浓度为15%的硫酸溶液中,78-90℃温度下水浴保温处理1-2h,后调节pH至中性,再取出进行干燥处理,得预处理硅藻土备用;
S2-2、将上述预处理硅藻土置于浓度为15%的氯化钠溶液中,搅拌混合均匀后离心,得沉淀进行干燥处理,得预处理沉淀备用;
S2-3、将上述预处理沉淀在450-500℃高温煅烧2-2.5h,再取出研磨过200目筛,得复合改性硅藻土。
优选的,所述步骤S2-1、S2-2中干燥处理的温度为105-110℃。
本发明提供一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,与现有技术相比优点在于:
(1)本发明添加有改性石英砂和复合改性硅藻土,能够有效保证混凝土拌合料的流动性,提升混凝土喷射施工的连续性,同时通过石英砂表面酸处理后包裹一层二氧化硅,提升材料的粗糙度,增大接触面积与复合改性硅藻土混合以及水泥加水拌合后能够提升联结强度,在保证固化效率的同时提升材料的力学性能。
(2)本发明中添加有膨胀剂,具有抵抗混凝土抗收缩能力,且添加微硅粉可增加混凝土早期强度和后期强度,增加其密实性,提高混凝土的抗渗性能,同时在微硅粉的作用下,水化产物 OS-H凝胶相和AFt相含量增加,而Ca(0H)2含量降低,具体而言,加入微硅粉后,由于其火山灰活性,起主要胶凝作用的C-S-H凝胶相含量增加,部分Ca(0H)2被反应而减少,将促进水泥 熟料的水化反应进程,增加后期强度。并且本发明还添加纳米氧化铝、纳米碳酸钙以及复合改性的硅藻土,一定程度上能够有效骨料的孔隙隙进行包覆和充填,减少导热通道。
(3)本发明采用聚丙烯纤维替代传统UHPC中的钢纤维,有效降低成本外提升材料的加工性能,防止钢纤维后续的生锈和损坏,综合提升混凝土的施工品质。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面结合本发明实施例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作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。
下述实施例和对比例的原料为:
水泥:海螺P·O42.5普通硅酸盐水泥,28d抗压强度为49.4MPa,比表面积为350m2/kg;
河砂:细度模数为1.6-2.4;
粗骨料:粒径在10-30mm连续级配的碎石;
膨胀剂:采用氯化钠1.2份、硫代硫酸钠1.5份、拉开粉BX 0.3份、减水剂JN 0.4份、氯化铵0.8份、铝粉0.005份、铁粉 95份复配而成;
石英砂:粒径0.15-2mm;
纳米氧化铝:粒径:40-80nm,比表面积<10m2/g;
纳米碳酸钙:粒径:40-80nm,堆密度:0.40 g/mL,吸油值:22.0-24.0g/100g,PH值:9.50-10.0
聚丙烯纤维:长度1-1.25cm;
硅藻土:临江硅藻土61790-53-2。
稳定增稠剂:淀粉醚和硅酸镁铝质量比2∶1混合制得。
实施例1:
原料制备:
1、改性石英砂的制备:
(1)将石英砂采用pH为5的酸液进行浸泡50min,取出石英砂采用乙醇冲洗干净后干燥,得预处理石英砂;
(2)按照质量比无水乙醇∶去离子水∶氨水∶预处理石英砂∶正硅酸四乙酯=4∶2.5∶0.6∶8∶0.1进行备料,将无水乙醇混合去离子水后加入氨水,再加入预处理石英砂,以400r/min的搅拌速度边搅拌边向其中滴加正硅酸四乙酯,室温反应6h,离心得综合产物备用;
(3)将综合产物于140℃温度下高温干燥得改性石英砂。
2、复合改性硅藻土的制备:
(1)将硅藻土加入浓度为15%的硫酸溶液中,于85℃温度下水浴保温处理1.5h,后调节pH至中性,再取出于110℃干燥至恒重,得预处理硅藻土备用;
(2)将上述预处理硅藻土置于浓度为15%的氯化钠溶液中,搅拌混合均匀后离心,得沉淀110℃干燥至恒重,得预处理沉淀备用;
(3)将上述预处理沉淀在500℃高温下煅烧2h,再取出研磨过200目筛,得复合改性硅藻土。
实施例2:
超高性能喷射混凝土的制备:
(1)按照以下质量份进行原料准备:水泥300份、河砂240份、粗骨料100份、膨胀剂8份、微硅粉10份、改性石英砂40份、纳米氧化铝8份、纳米碳酸钙8份、聚丙烯纤维16份、复合改性硅藻土8份、稳定增稠剂2份、水100份;
(2)将各原料混合均匀后再添加水,以200r/min的转速搅拌混合5min,得超高性能喷射混凝土。
实施例3:
超高性能喷射混凝土的制备:
(1)按照以下质量份进行原料准备:水泥360份、河砂280份、粗骨料200份、膨胀剂10份、微硅粉20份、改性石英砂60份、纳米氧化铝10份、纳米碳酸钙10份、聚丙烯纤维20份、复合改性硅藻土10份、稳定增稠剂4份、水120份;
(2)将各原料混合均匀后再添加水,以200r/min的转速搅拌混合5min,得超高性能喷射混凝土。
实施例4:
超高性能喷射混凝土的制备:
(1)按照以下质量份进行原料准备:水泥340份、河砂260份、粗骨料150份、膨胀剂9份、微硅粉15份、改性石英砂50份、纳米氧化铝9份、纳米碳酸钙9份、聚丙烯纤维18份、复合改性硅藻土9份、稳定增稠剂3份、水110份;
(2)将各原料混合均匀后再添加水,以200r/min的转速搅拌混合5min,得超高性能喷射混凝土。
对比例:
参照上述实施例4的制备方法和原料用量,对膨胀剂、改性石英砂、复合改性硅藻土的添加进行替换和删除,设计多组对照组混凝土,具体原料选择如下表1所示:
;
上表1中“√”为添加,“×”为不添加,且在选择普通石英砂、硅藻土是添加的量与对比例4中改性石英砂和复合改性硅藻土的添加量相同,其余原料和添加量均与实施例4相同,其中对照组5中速凝剂选择森普牌SP-HQ型无碱液体速凝剂,添加量为水泥添加量的3%,且速凝剂的加入方式为随水加入,进行混凝土制备。
检测:
1、对实施例2-4和对比例中对照组1-5所制得的混凝土进行凝结时间检测,具体检测方式如下:
(1)将试模放在玻璃板上,在内侧稍稍涂上一层机油,调整凝结时间测定仪的试针接触玻璃板时,指针对准标准尺零点;
(2)试件的制备:以设计用水量持续搅拌成标准稠度浆体,立即一次性装入试模,振动数次后刮平,然后放人湿气养护箱内(从开始加水的时间作为凝结时间的起始时间);
(3)将制备好的浆体试件放置在恒温恒湿养护箱养护(20±2℃,湿度为95%),每隔30min测试一次,得初凝和终凝时间,具体结果如下表2所示:
;
由上表2可知,实施例2-4相较于对照组5中不添加速凝剂的初凝和终凝时间差距较小(30min)。
2、根据T/CECS864-2021《超高性能混凝土试验方法标准》对上述实施例2-4和对比例中对照组1-5所制得的混凝土进行扩展度测试(测试材料的流动性):
将刚拌合好的混凝土一次性均匀填满坍落度筒,加满后刮去多余拌合物,沿筒口抹平,不进行插捣,清除坍落度筒周围多余的混凝土拌合物,将坍落度筒垂直平稳提起。当试样不再扩展时,用钢尺测量UHPC拌合物展开面的最大直径与最大直径呈垂直方向的直径,取其平均值作为扩展度试验结果,具体结果如下表3所示:
;
由上表可知实施例2-4和对照组1均具有较高的扩展度,即混凝土具有良好的流动性,便于喷射施工,而对照组5扩展度较低。
3、参照《超高性能混凝土试验方法标准》,将上述实施例2-4和对比例中对照组1-5所制得的混凝土制备成100mm×100mm×100mm的立方体试块(制备方式为将混凝土倒入模具中,并振动至密实状态,后在20±2℃条件下静置24h后拆模,将拆模后的试件置于20±2℃、相对湿度95%以上的标准养护室内进行养护),对试块进行抗压强度试验,分别检测养护3d、7d、28d时试件的抗压强度,具体结果见下表4:
;
由上表4可知,实施例2-4相较于对照组1-4其抗压强度显著升高,而对照组5中混凝土在前期3d、7d的养护过程中抗压强度略高于实施例2-4(与实施例3差距在1Mpa-3Mpa),但是在28d的抗压强度对照组5显著低于各组实施例。
4、抗折性能检测:
采用上述实施例2-4和对比例1-5获得的混凝土进行制备直角棱柱体小梁试件(标准试件尺寸为150mm×150mm×550mm),标准养护条件下养护3d、7d和8d,检测各组的抗折强度:
采用最大负荷为1000 kN 的万能试验机进行测定,加载采用位移控制,速率设定为0.1mm/min,抗折强度的计算如下:
F=(pl)/(ah2);
其中,F为抗折强度(Mpa);P为试件破坏时的极限荷载(N);l为棱柱体试件的棱长(mm);a 为棱柱体试件的底边宽度(mm);h为棱柱体试件的底边高度(mm);
具体检测结果如下表5所示:
;
由上表可知,实施例2-4所制备的混凝土具有良好的抗折效果。
以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。
Claims (7)
1.一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于,所述无速凝剂辅助施工的超高性能喷射混凝土制配方法为采用以下重量份原料进行配置:水泥300-360份、河砂240-280份、粗骨料100-200份、膨胀剂8-10份、微硅粉10-20份、改性石英砂40-60份、纳米氧化铝8-10份、纳米碳酸钙8-10份、聚丙烯纤维16-20份、复合改性硅藻土8-10份、稳定增稠剂2-4份、水100-120份;
所述改性石英砂的制备方法包括以下步骤:
S1-1、将石英砂采用酸液进行浸泡后,取出石英砂采用乙醇冲洗干净后干燥,得预处理石英砂;
S1-2、将无水乙醇混合去离子水后加入氨水,再加入预处理石英砂,边搅拌边向其中滴加正硅酸四乙酯,室温反应6h,离心得综合产物备用;
S1-3、将综合产物120-160℃高温干燥后得改性石英砂;
所述复合改性硅藻土的制备方法包括以下步骤:
S2-1、将硅藻土加入浓度为15%的硫酸溶液中,78-90℃温度下水浴保温处理1-2h,后调节pH至中性,再取出进行干燥处理,得预处理硅藻土备用;
S2-2、将上述预处理硅藻土置于浓度为15%的氯化钠溶液中,搅拌混合均匀后离心,得沉淀进行干燥处理,得预处理沉淀备用;
S2-3、将上述预处理沉淀在450-500℃高温煅烧2-2.5h,再取出研磨过200目筛,得复合改性硅藻土;
且混凝土的制备方法为将各原料混合搅拌均匀后加入水进行拌合充分再使用。
2.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于:所述河砂的细度模数为1.6-2.4,所述粗骨料为粒径在10-30mm连续级配的碎石。
3.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于:所述膨胀剂由以下重量份物质组成:氯化钠1.2份、硫代硫酸钠1.5份、拉开粉BX0.3份、减水剂JN 0.4份、氯化铵0.8份、铝粉0.005份、铁粉 95份。
4.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于:所述稳定增稠剂为淀粉醚和硅酸镁铝质量比2∶1混合得到。
5.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于:所述步骤S1-1中酸液浸泡中酸液的pH为4.5-5.5,浸泡时间为40-60min。
6.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于:所述步骤S1-2中各物质添加的质量比为:无水乙醇∶去离子水∶氨水∶预处理石英砂∶正硅酸四乙酯=4∶2.5∶0.6∶8∶0.1。
7.根据权利要求1所述的一种无速凝剂辅助施工的超高性能喷射混凝土制配方法,其特征在于,所述步骤S2-1、S2-2中干燥处理的温度为105-110℃。
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