{
  "title": "The First Pour — A Field Guide",
  "author": "Carlos Acosta",
  "version": "1.0",
  "location": "Corpus Christi, TX",
  "date": "2026-07-20",
  
  "mix_ratio": {
    "cement": {
      "part_by_weight": 1.0,
      "volume_equivalent_sacks": 1,
      "weight_lb": 94,
      "wikidata": "Q45190",
      "description": "hydraulic binder made from limestone and clay"
    },
    "sand": {
      "part_by_weight": 2.0,
      "volume_equivalent_cu_ft": 2,
      "standard": "ASTM C33"
    },
    "aggregate": {
      "part_by_weight": 3.0,
      "volume_equivalent_cu_ft": 3,
      "size_inches": 0.75,
      "standard": "ACI 211.1"
    },
    "water": {
      "w_c_ratio_min": 0.40,
      "w_c_ratio_nominal": 0.45,
      "w_c_ratio_max": 0.50,
      "gallons_per_sack_min": 5.0,
      "gallons_per_sack_max": 6.0,
      "wikidata": "Q283",
      "formula": "H2O"
    }
  },
  
  "timing_phases": {
    "base_temp_f": 75,
    "total_set_minutes": 90,
    "phases": [
      {
        "name": "MIXING",
        "start_min": 0,
        "end_min": 10,
        "action": "rotate drum, watch for clumps"
      },
      {
        "name": "TRANSPORT",
        "start_min": 10,
        "end_min": 25,
        "action": "keep agitation, no stops >2 min"
      },
      {
        "name": "POUR",
        "start_min": 25,
        "end_min": 45,
        "action": "continuous flow, rod every 12 inches"
      },
      {
        "name": "FLOAT",
        "start_min": 45,
        "end_min": 60,
        "action": "wood trowel only"
      },
      {
        "name": "SEED",
        "start_min": 60,
        "end_min": 90,
        "action": "cover with burlap, begin cure"
      }
    ],
    "temp_correction": {
      "above_75f_adjust_min_per_5f": -5,
      "below_75f_adjust_min_per_5f": 8
    }
  },
  
  "environmental_limits": {
    "humidity_rh_high_threshold": 80,
    "humidity_water_reduction_at_high": -0.03,
    "humidity_rh_low_threshold": 40,
    "wind_mph_cover_threshold": 15
  },
  
  "citations": {
    "cement": "https://www.wikidata.org/entity/Q45190",
    "water": "https://www.wikidata.org/entity/Q283",
    "standards": ["ASTM C33", "ACI 211.1"]
  },
  
  "related_work": {
    "beam_calculator": "https://carlos-acosta.4ort.net/tools/beam-load.html",
    "hyperfilm": "https://carlos-acosta.4ort.net/films/el-calor-del-comal/",
    "neighbor_knowledge": "alvester"
  }
}