Acid-resistant dry-mixed mortar

Abstract

The invention discloses acid-resistant dry-mixed mortar which comprises the following components in percentage by mass: combined cement, casting waste sand, yellow ground, coal ash, slag powder, lithium slag, wood fiber, cellulose ether, a redispersible polymer and polysiloxane powder. Compared with the prior art, the acid-resistant dry-mixed mortar has the following advantages that the addition ratio of the combined cement is appropriately increased; a part of the yellow ground is replaced by the casting waste slag and the lithium slag, so that the difficulty that the yellow ground is in supply shortage is alleviated, and the preparation cost is lowered; meanwhile, under the action of the polysiloxane powder and on premise that the strength of the dry-mixed mortar is ensured, the lithium slag and the combined cement can improve the acid resistance of the dry-mixed mortar, and after the dry-mixed mortar is used normally, the erosion rate of the dry-mixed mortar in an acid environment is less than 1% within two years, and the compressive strength of the dry-mixed mortar is reduced by about 8% after two years, being of relatively optimal levels.

Description

Technical field

[0001] The invention belongs to the technical field of building materials, and specifically relates to an acid-resistant dry powder mortar. Background technique

[0002] Dry powder mortar refers to a granular or powdery mixture of aggregates, inorganic cementing materials and additives in a certain proportion after drying and screening. The additives are water-retaining agents, thickeners, polymers, etc. Materials that can be used directly after being mixed with water in bags or in bulk form. Compared with traditional on-site mixing mortar, dry mortar has the following advantages: high quality, rich variety, good construction performance, convenient use, environmental protection, economy, etc. Characteristics, the aggregate used in dry mortar is mainly natural yellow sand, which is in great demand, but yellow sand is a non-renewable resource, and its price is soaring. As the country protects natural rivers, it will inevitably restrict the exploitation of natural y...

Examples

Embodiment 1

[0013] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 25%, foundry waste 10%, yellow sand 34%, fly ash 3%, slag powder 12%, lithium slag 15%, 0.6% wood fiber, 0.3% cellulose ether, 0.03% redispersible polymer, 0.07% polysiloxane powder;

[0014] Wherein, the combined cement is a combination of crystalline cement, high-resistance sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.2:2.

Embodiment 2

[0016] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 28%, foundry waste sand 6%, yellow sand 36%, fly ash 5%, slag powder 10%, lithium slag 12%, 0.7% wood fiber, 0.2% cellulose ether, 0.04% redispersible polymer, 0.06% polysiloxane powder;

[0017] Wherein, the combined cement is a combination of crystallized cement, high-resistant sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.3:1.9.

Embodiment 3

[0019] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 30%, foundry waste sand 5%, yellow sand 38%, fly ash 2%, slag powder 14%, lithium slag 10%, 0.7% wood fiber, 0.2% cellulose ether, 0.02% redispersible polymer, 0.08% polysiloxane powder;

[0020] Wherein, the combined cement is a combination of crystalline cement, high-resistant sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.5:1.8.

[0021] Replace 25% of the combined cement with a single type of sand, which is the control group 1-3, and replace it with two types of sand, which are 4-6 respectively. The specific correspondence is as follows:

[0022] Group cement Ratio Control group 1 Crystallized cement / Control group 2 High resistance to sulfuric acid Portland cement / Control group 3 Fast hardening sulphoaluminate cement / Control group 4 Crystallized cement and high resistance...

Technical field

[0001] The invention belongs to the technical field of building materials, and specifically relates to an acid-resistant dry powder mortar. Background technique

[0002] Dry powder mortar refers to a granular or powdery mixture of aggregates, inorganic cementing materials and additives in a certain proportion after drying and screening. The additives are water-retaining agents, thickeners, polymers, etc. Materials that can be used directly after being mixed with water in bags or in bulk form. Compared with traditional on-site mixing mortar, dry mortar has the following advantages: high quality, rich variety, good construction performance, convenient use, environmental protection, economy, etc. Characteristics, the aggregate used in dry mortar is mainly natural yellow sand, which is in great demand, but yellow sand is a non-renewable resource, and its price is soaring. As the country protects natural rivers, it will inevitably restrict the exploitation of natural y...

Examples

Embodiment 1

[0013] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 25%, foundry waste 10%, yellow sand 34%, fly ash 3%, slag powder 12%, lithium slag 15%, 0.6% wood fiber, 0.3% cellulose ether, 0.03% redispersible polymer, 0.07% polysiloxane powder;

[0014] Wherein, the combined cement is a combination of crystalline cement, high-resistance sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.2:2.

Embodiment 2

[0016] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 28%, foundry waste sand 6%, yellow sand 36%, fly ash 5%, slag powder 10%, lithium slag 12%, 0.7% wood fiber, 0.2% cellulose ether, 0.04% redispersible polymer, 0.06% polysiloxane powder;

[0017] Wherein, the combined cement is a combination of crystallized cement, high-resistant sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.3:1.9.

Embodiment 3

[0019] An acid-resistant dry powder mortar, including the following components, and the mass percentage of each component is: combined cement 30%, foundry waste sand 5%, yellow sand 38%, fly ash 2%, slag powder 14%, lithium slag 10%, 0.7% wood fiber, 0.2% cellulose ether, 0.02% redispersible polymer, 0.08% polysiloxane powder;

[0020] Wherein, the combined cement is a combination of crystalline cement, high-resistant sulfuric acid Portland cement and fast hardening sulphoaluminate cement, and the combination ratio is 1:1.5:1.8.

[0021] Replace 25% of the combined cement with a single type of sand, which is the control group 1-3, and replace it with two types of sand, which are 4-6 respectively. The specific correspondence is as follows:

[0022] Group cement Ratio Control group 1 Crystallized cement / Control group 2 High resistance to sulfuric acid Portland cement / Control group 3 Fast hardening sulphoaluminate cement / Control group 4 Crystallized cement and high resistance...

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